F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > B48/B46 Tuning Thread
GetBMWParts
Post Reply
 
Thread Tools Search this Thread
      09-07-2020, 11:58 PM   #1
Avaley
Lieutenant
Avaley's Avatar
488
Rep
411
Posts

Drives: f32 bm3 stg2 & 982 GT4
Join Date: Sep 2020
Location: Nürburgring

iTrader: (0)

Garage List
B48/B46 Tuning Thread

I've seen a ton of information on N20 tuning, times, dynos and results and wanted to see if anyone has had any luck modifying the B46/B48 engine now that the standard service warranty is beginning to fall off...

I have a stock 2018 430ix 8AT and will be adding FBO and a BM3 stage 1 tune to start.

Will be throwing these on in (thanks to Mike at XPH) within the next few months:
  • BM3 Stage 2
  • xHP Stage 3 8AT Transmission Flash
  • Injen SP Open Air Intake
  • Evolution Raceworks Catless Downpipe
  • Evolution Raceworks Charge Pipe Kit
  • Full AWE Catback Exhaust Suite

Things that I'm thinking of doing / will do later:
  • Black rims, 225/50/18R front and 245/50/18R rear - open to suggestions
  • BM3 Stage 2 E30 tune
  • CSF Heat Exchanger (unsure if necessary on B48 or worth it)

Would love to hear folks experience with this engine and open to any suggestions, thoughts and/or tips in tuning. Will keep this threaded updated.

Last edited by Avaley; 09-23-2020 at 10:20 AM..
Appreciate 0
      09-08-2020, 03:48 AM   #2
Luverse
Second Lieutenant
Luverse's Avatar
Indonesia
152
Rep
280
Posts

Drives: BMW F30
Join Date: Oct 2019
Location: Jakarta

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
I've seen a ton of information on N20 tuning, times, dynos and results and wanted to see if anyone has had any luck modifying the B46/B48 engine now that the standard service warranty is beginning to fall off...

I have a stock 2018 430ix 8AT and will be adding FBO and a BM3 stage 1 tune to start.

Will be throwing these on in (thanks to Mike at XPH) within the next few months:
  • BM3 Stage 1 + Transmission Flash
  • Injen SP Air Intake
  • Evolution Raceworks Charge Pipe Kit
  • Evolution Raceworks Catless Downpipe
  • Full AWE Exhaust Suite (Axleback Touring Single Sided + Performance Resonated Midpipe)

Things that I'm thinking of doing / will do later:
  • BM3 Stage 2 (worried about reliability / breaking the engine)
  • 19" lightweight alloy wheels and performance tires (open to suggestions)
  • CSF Heat Exchanger (unsure if necessary on B48 or worth it)

Would love to hear folks experience with this engine and open to any suggestions, thoughts and/or tips in tuning. Will keep this threaded updated.
i'm using B48 engine and Stage 2 BM3 for run and Stage 1 BM3 for daily

Performance mods so far:
1. Armytrix Catless Downpipe
2. Straight pipe exhaust with valvetronic remote control
3. FTP Charge pipe
4. FTP intake pipe
5. BMS open billet intake
6. BM3

Love the performance it deliver. But after several discussion with PTF, and due to minor accident, i removed the BMS open billet intake and now using stock intake.

PTF said, their tune is designed and tested to work with stock intake, and they not recommend us to use any aftermarket intake.

After i revert back to stock intake, i do feel that the performance is better and throttle response is much better. But i lost the fun noise of aftermarket intake.
__________________
Instagram: nightfall.f30
Appreciate 1
Avaley487.50

      09-08-2020, 12:08 PM   #3
Avaley
Lieutenant
Avaley's Avatar
488
Rep
411
Posts

Drives: f32 bm3 stg2 & 982 GT4
Join Date: Sep 2020
Location: Nürburgring

iTrader: (0)

Garage List
Quote:
Originally Posted by Luverse View Post
i'm using B48 engine and Stage 2 BM3 for run and Stage 1 BM3 for daily

Performance mods so far:
1. Armytrix Catless Downpipe
2. Straight pipe exhaust with valvetronic remote control
3. FTP Charge pipe
4. FTP intake pipe
5. BMS open billet intake
6. BM3

Love the performance it deliver. But after several discussion with PTF, and due to minor accident, i removed the BMS open billet intake and now using stock intake.

PTF said, their tune is designed and tested to work with stock intake, and they not recommend us to use any aftermarket intake.

After i revert back to stock intake, i do feel that the performance is better and throttle response is much better. But i lost the fun noise of aftermarket intake.
Awesome! Thank you for the response, glad to see someone with success in tuning the B48. I looked through some of your posts, it seems that I'll probably want a XHP transmission tune for my 8AT as well...funny that the intake actually makes things worse - is it related to heat soak? Have you dyno'd? I feel that basic bolt ons and tune should get the B46/48 to 300whp. I'm going to be doing intake + tune first so will report back soon...will start with just tune and see if the intake makes things worse like yours
Appreciate 0
      09-08-2020, 08:40 PM   #4
Luverse
Second Lieutenant
Luverse's Avatar
Indonesia
152
Rep
280
Posts

Drives: BMW F30
Join Date: Oct 2019
Location: Jakarta

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Awesome! Thank you for the response, glad to see someone with success in tuning the B48. I looked through some of your posts, it seems that I'll probably want a XHP transmission tune for my 8AT as well...funny that the intake actually makes things worse - is it related to heat soak? Have you dyno'd? I feel that basic bolt ons and tune should get the B46/48 to 300whp. I'm going to be doing intake + tune first so will report back soon...will start with just tune and see if the intake makes things worse like yours
XHP transmission tune will definitely bring the fun to the whole next level.

I believe because the OTS map is designed and tested with stock intake, so PTF will not recomended aftermarket intake.

My latest dyno recorded 310hp and 445nm, on engine. That still using the BMS open billet intake. Haven't dyno'd again with stock intake.

For reference, this is PTF statement
Name:  PTF respond.jpg
Views: 427
Size:  113.2 KB
__________________
Instagram: nightfall.f30
Appreciate 1
Avaley487.50

      09-08-2020, 11:33 PM   #5
Avaley
Lieutenant
Avaley's Avatar
488
Rep
411
Posts

Drives: f32 bm3 stg2 & 982 GT4
Join Date: Sep 2020
Location: Nürburgring

iTrader: (0)

Garage List
Quote:
Originally Posted by Luverse View Post
XHP transmission tune will definitely bring the fun to the whole next level.

I believe because the OTS map is designed and tested with stock intake, so PTF will not recomended aftermarket intake.

My latest dyno recorded 310hp and 445nm, on engine. That still using the BMS open billet intake. Haven't dyno'd again with stock intake.

For reference, this is PTF statement
Attachment 2408944
Awesome those are great numbers. I wonder maybe if it’s just a liability release or what the lawyers tell them to recommend but I would imagine an air aftermarket intake to still be a net positive.

I flashed stage 1 today and I am shocked at how much torque it added, everything else stock. My Injen SP open air intake is coming next so we shall see how it feels....

So BM3 doesn’t do anything to the transmission? The 8AT in sport puts down power and almost reads your mind and the engine just goes to redline each gear now. Also the fan always on option is great and my temps are noticeably cooler.

Have you tried ethanol mix? With your numbers, I feel like this engine can do 330hp 350ft lbs (475NM) trq at the crank with E30 stage 2 fbo. Bmws 4 bangers have always been underrated and could prob get to low 5s 0-60 and maybe break w FBO stage 2. I should get performance tires (19s?) and hopefully we b48 owners can push it to see gains over N series, an already great engine.

Last edited by Avaley; 09-08-2020 at 11:58 PM..
Appreciate 0
      09-09-2020, 06:09 AM   #6
Luverse
Second Lieutenant
Luverse's Avatar
Indonesia
152
Rep
280
Posts

Drives: BMW F30
Join Date: Oct 2019
Location: Jakarta

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Awesome those are great numbers. I wonder maybe if it’s just a liability release or what the lawyers tell them to recommend but I would imagine an air aftermarket intake to still be a net positive.

I flashed stage 1 today and I am shocked at how much torque it added, everything else stock. My Injen SP open air intake is coming next so we shall see how it feels....

So BM3 doesn’t do anything to the transmission? The 8AT in sport puts down power and almost reads your mind and the engine just goes to redline each gear now. Also the fan always on option is great and my temps are noticeably cooler.

Have you tried ethanol mix? With your numbers, I feel like this engine can do 330hp 350ft lbs (475NM) trq at the crank with E30 stage 2 fbo. Bmws 4 bangers have always been underrated and could prob get to low 5s 0-60 and maybe break w FBO stage 2. I should get performance tires (19s?) and hopefully we b48 owners can push it to see gains over N series, an already great engine.
so far, from what i see on youtube, aftermarket intake only provide sound. No noticeable performance gain, even on dyno. In fact, some aftermarket intake cause decrease in dyno number.

No transmission tune for B48 engine. We need to get it from XHP.

Some folk says, the MAX cooling mode will wear your cooling system faster. I always set that option to off.

Nope, there's no ethanol in my country. Several folks here on B48 engine already run 0-60 in 4.8s. I believe they already post their dragy results.

I would recommend you get a better tyre. I went with Toyo Proxes T1R which is good, but now i'm using Yokohama Advan Sport V105 which is great.
__________________
Instagram: nightfall.f30
Appreciate 1
Avaley487.50

      09-11-2020, 02:35 AM   #7
Dronamashina
Private
Dronamashina's Avatar
28
Rep
91
Posts

Drives: Bmw 320 lci
Join Date: Jun 2019
Location: St.Petersburg

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Bmws 4 bangers have always been underrated and could prob get to low 5s 0-60 and maybe break w FBO stage 2. I should get performance tires (19s?) and hopefully we b48 owners can push it to see gains over N series, an already great engine.
AWD and XHP transflash is a great combo! I added torque (launch control) in XHP custom settings (ajustable launch control) and now i can do -60 in 4.7 sec easily with regular st2 ots map. With custom st2 E50 tune 0-60 goes down to 4.3-4.4 sec. My best numbers with dragy are 4.18 0-60 and 12.43 1/4 mile!
And N20 isnt great engine at all. It has a lot of weak points and problems, and i dont think N20 has ever shown such numbers with stock turbo as B48.
Forgot to say that i have 2018 320ix and MGflasher tune.
Attached Images
  
__________________
2018 320ix AWD B48 8AT | Catless Downpipe | MG ST2 | XHP ST3
Instagram: andreykrop
Youtube: DronaMashina
Appreciate 1
Avaley487.50

      09-11-2020, 03:13 AM   #8
Luverse
Second Lieutenant
Luverse's Avatar
Indonesia
152
Rep
280
Posts

Drives: BMW F30
Join Date: Oct 2019
Location: Jakarta

iTrader: (0)

Quote:
Originally Posted by Dronamashina View Post
AWD and XHP transflash is a great combo! I added torque (launch control) in XHP custom settings (ajustable launch control) and now i can do -60 in 4.7 sec easily with regular st2 ots map. With custom st2 E50 tune 0-60 goes down to 4.3-4.4 sec. My best numbers with dragy are 4.18 0-60 and 12.43 1/4 mile!
And N20 isnt great engine at all. It has a lot of weak points and problems, and i dont think N20 has ever shown such numbers with stock turbo as B48.
Forgot to say that i have 2018 320ix and MGflasher tune.
what's the boost target for MGFlasher St 2 OTS?
that's quite impressive number you got
__________________
Instagram: nightfall.f30
Appreciate 0
      09-11-2020, 04:47 AM   #9
Dronamashina
Private
Dronamashina's Avatar
28
Rep
91
Posts

Drives: Bmw 320 lci
Join Date: Jun 2019
Location: St.Petersburg

iTrader: (0)

Quote:
Originally Posted by Luverse View Post
what's the boost target for MGFlasher St 2 OTS?
that's quite impressive number you got
Around 19 psi as I remember
Appreciate 0
      09-11-2020, 10:33 AM   #10
Avaley
Lieutenant
Avaley's Avatar
488
Rep
411
Posts

Drives: f32 bm3 stg2 & 982 GT4
Join Date: Sep 2020
Location: Nürburgring

iTrader: (0)

Garage List
Quote:
Originally Posted by Dronamashina View Post
AWD and XHP transflash is a great combo! I added torque (launch control) in XHP custom settings (ajustable launch control) and now i can do -60 in 4.7 sec easily with regular st2 ots map. With custom st2 E50 tune 0-60 goes down to 4.3-4.4 sec. My best numbers with dragy are 4.18 0-60 and 12.43 1/4 mile!
And N20 isnt great engine at all. It has a lot of weak points and problems, and i dont think N20 has ever shown such numbers with stock turbo as B48.
Forgot to say that i have 2018 320ix and MGflasher tune.
Wow super impressive numbers don't think i've seen any other B48 run a sub 4.5s but makes sense as power is probably equal to B58 (which does 4.5 according to BMW) once FBO'd stage 2 E50 with 100 lbs less...my ethernet lightning adapter is on the way and will flash XHP stage 2 and add an intake to my stage 1 this weekend.

It seems that MGflasher might perform better than BM3 Stage2 though it is younger in adoption based on your post history....I may have to switch over or get a Cary Jordan custom BM3 tune after DP/straight pipe/stage 2.

I think the newer 8AT is the ZF 8HP50 which should be able to handle 500NM so the trans probably outlives the engine under boost.

How is the daily usability (both Luverse on your BM3st2 and Drona on your MGst2)? I find BM3 stage 1 in comfort to be unnoticeable to stock in traffic but day and night different under WOT in sport+ S gear. I'm a bit worried about pushing the engine too much as I've heard N20 was unreliable when pushed hard tho 19 PSI seems within reason...still early in B48 tuning life but promising if it stays reliable
Appreciate 0
      09-11-2020, 10:14 PM   #11
Luverse
Second Lieutenant
Luverse's Avatar
Indonesia
152
Rep
280
Posts

Drives: BMW F30
Join Date: Oct 2019
Location: Jakarta

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Wow super impressive numbers don't think i've seen any other B48 run a sub 4.5s but makes sense as power is probably equal to B58 (which does 4.5 according to BMW) once FBO'd stage 2 E50 with 100 lbs less...my ethernet lightning adapter is on the way and will flash XHP stage 2 and add an intake to my stage 1 this weekend.

It seems that MGflasher might perform better than BM3 Stage2 though it is younger in adoption based on your post history....I may have to switch over or get a Cary Jordan custom BM3 tune after DP/straight pipe/stage 2.

I think the newer 8AT is the ZF 8HP50 which should be able to handle 500NM so the trans probably outlives the engine under boost.

How is the daily usability (both Luverse on your BM3st2 and Drona on your MGst2)? I find BM3 stage 1 in comfort to be unnoticeable to stock in traffic but day and night different under WOT in sport+ S gear. I'm a bit worried about pushing the engine too much as I've heard N20 was unreliable when pushed hard tho 19 PSI seems within reason...still early in B48 tuning life but promising if it stays reliable
for daily, i'm using stage 1 BM3 more often than stage 2. Because the traffic here is so bad, average speed can drop to 5km/h.

when doing a morning run with the crew, i'm using stage 2, and often go WOT, no problem so far.

able to pull this far on stage 2 OTS BM3
Name:  Screenshot_20200907-124522_Instagram.jpg
Views: 367
Size:  586.5 KB
__________________
Instagram: nightfall.f30
Appreciate 0
      09-11-2020, 10:48 PM   #12
sspade
Banned
United_States
980
Rep
4,646
Posts

Drives: F30
Join Date: Oct 2017
Location: Folsom, California

iTrader: (3)

Garage List
2016 BMW 320i  [0.00]
2014 BMW 328i  [5.00]
N20 is still proven to be faster than B48.

Proof is in the pudding.

Quarter Mile, world wide rankings can be found here:


https://www.facebook.com/groups/2443...651/?ref=share
Appreciate 0
      09-11-2020, 10:49 PM   #13
sspade
Banned
United_States
980
Rep
4,646
Posts

Drives: F30
Join Date: Oct 2017
Location: Folsom, California

iTrader: (3)

Garage List
2016 BMW 320i  [0.00]
2014 BMW 328i  [5.00]
Also...

N20 is a back to back winner of Ward's 10 Best Engines.

B48 is a zero time winner.
Appreciate 0
      09-12-2020, 01:53 AM   #14
Avaley
Lieutenant
Avaley's Avatar
488
Rep
411
Posts

Drives: f32 bm3 stg2 & 982 GT4
Join Date: Sep 2020
Location: Nürburgring

iTrader: (0)

Garage List
Quote:
Originally Posted by sspade View Post
N20 is still proven to be faster than B48.

Proof is in the pudding.

Quarter Mile, world wide rankings can be found here:


https://www.facebook.com/groups/2443...651/?ref=share
Don't have access but how does this rank? @Dronamashina

__________________
430i xDrive Coupé, B48 bm3 stg 2, ZF8HP50 xHP stg 3, ER catless dp, ER chargepipe kit, awe midpipe & axleback touring straight pipe exhaust, injen intake & inlet pipe
Appreciate 0
      09-12-2020, 04:26 AM   #15
Dronamashina
Private
Dronamashina's Avatar
28
Rep
91
Posts

Drives: Bmw 320 lci
Join Date: Jun 2019
Location: St.Petersburg

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Don't have access but how does this rank? @Dronamashina

1st place ha ha)) but they will never put me in that board...
Appreciate 0
      09-12-2020, 04:40 AM   #16
Dronamashina
Private
Dronamashina's Avatar
28
Rep
91
Posts

Drives: Bmw 320 lci
Join Date: Jun 2019
Location: St.Petersburg

iTrader: (0)

Quote:
Originally Posted by sspade View Post
Also...

N20 is a back to back winner of Ward's 10 Best Engines.

B48 is a zero time winner.
N20 has open deck and weak factory pistons. It has so many problems, so many blown engines... what are you talking about? Awards won’t make n20 reliable and tuneable. Also I have better 1/4 mile than all of those n20s in that leaderboard you posted above.
P.S. I had both n20 and b48, actually two b48s so I now what I’m talking about.
Appreciate 2
Avaley487.50
VipinLJ944.50

      09-12-2020, 11:42 AM   #17
Dronamashina
Private
Dronamashina's Avatar
28
Rep
91
Posts

Drives: Bmw 320 lci
Join Date: Jun 2019
Location: St.Petersburg

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Wow super impressive numbers don't think i've seen any other B48 run a sub 4.5s but makes sense as power is probably equal to B58 (which does 4.5 according to BMW) once FBO'd stage 2 E50 with 100 lbs less...my ethernet lightning adapter is on the way and will flash XHP stage 2 and add an intake to my stage 1 this weekend.

It seems that MGflasher might perform better than BM3 Stage2 though it is younger in adoption based on your post history....I may have to switch over or get a Cary Jordan custom BM3 tune after DP/straight pipe/stage 2.

I think the newer 8AT is the ZF 8HP50 which should be able to handle 500NM so the trans probably outlives the engine under boost.

How is the daily usability (both Luverse on your BM3st2 and Drona on your MGst2)? I find BM3 stage 1 in comfort to be unnoticeable to stock in traffic but day and night different under WOT in sport+ S gear. I'm a bit worried about pushing the engine too much as I've heard N20 was unreliable when pushed hard tho 19 PSI seems within reason...still early in B48 tuning life but promising if it stays reliable
Yes MG performs better than bm3, I know one guy that moved from bm3 to MG because of that and he’s happy with that as I remember.

8hp50 holds much more than 500nm, 340 has the same trans and with simple tune it has 600+ nm and no problems. I did 700+ hard launches (3000-4000 rpms) and everything is fine.

Daily usability is great! Comfort or aggressive when you need it.

Last edited by Dronamashina; 09-12-2020 at 11:48 AM..
Appreciate 1
Avaley487.50

      09-12-2020, 02:55 PM   #18
Avaley
Lieutenant
Avaley's Avatar
488
Rep
411
Posts

Drives: f32 bm3 stg2 & 982 GT4
Join Date: Sep 2020
Location: Nürburgring

iTrader: (0)

Garage List
Quote:
Originally Posted by sspade View Post
Also...

N20 is a back to back winner of Ward's 10 Best Engines.

B48 is a zero time winner.
Its also nearly a 10 year old data point and not a good comparison...since BMW went modular B series, B58 engine has won an award 5 out of last 6 years...B48 is the B58 with 2 less cylinders...

https://en.wikipedia.org/wiki/Ward%27s_10_Best_Engines

I'm trying to avoid a N20 vs B48 flame thread and focusing on B48 tuning specifically.

Quote:
Originally Posted by Dronamashina View Post
N20 has open deck and weak factory pistons. It has so many problems, so many blown engines... what are you talking about? Awards won’t make n20 reliable and tuneable. Also I have better 1/4 mile than all of those n20s in that leaderboard you posted above.
P.S. I had both n20 and b48, actually two b48s so I now what I’m talking about.
Drona, now that you have straight piped and did 12.4s before exhaust mods, I would dare to guess that the B48 stage 2, e50 with FBO is capable of a 12s 1/4 mile...you haven't done intake, charge pipe, spark plugs or methanol and what rims / tires?

In the 2021 G series this year, they up tuned the B48/B58 again and shaved another 0.2s off 0-60 and BMW is now claiming 255hp/400nm (5.3) in the B48 and 382hp/500nm (4.3) in the B58 from the factory so there is definitely so more potential to be had.

Any thoughts on changing your factory heat exchanger? Since going air-to-water and away from an intercooler, i dont think there are a ton of heat issues but CSF makes a upgraded radiator tested to keep temps cooler but the factory one has done great for me, esp with the max cool setting in BM3.

https://csfrace.com/bmw-b58-cooling/
__________________
430i xDrive Coupé, B48 bm3 stg 2, ZF8HP50 xHP stg 3, ER catless dp, ER chargepipe kit, awe midpipe & axleback touring straight pipe exhaust, injen intake & inlet pipe

Last edited by Avaley; 09-12-2020 at 03:12 PM..
Appreciate 0
      09-12-2020, 04:21 PM   #19
Dronamashina
Private
Dronamashina's Avatar
28
Rep
91
Posts

Drives: Bmw 320 lci
Join Date: Jun 2019
Location: St.Petersburg

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Its also nearly a 10 year old data point and not a good comparison...since BMW went modular B series, B58 engine has won an award 5 out of last 6 years...B48 is the B58 with 2 less cylinders...

https://en.wikipedia.org/wiki/Ward%27s_10_Best_Engines

I'm trying to avoid a N20 vs B48 flame thread and focusing on B48 tuning specifically.



Drona, now that you have straight piped and did 12.4s before exhaust mods, I would dare to guess that the B48 stage 2, e50 with FBO is capable of a 12s 1/4 mile...you haven't done intake, charge pipe, spark plugs or methanol and what rims / tires?

In the 2021 G series this year, they up tuned the B48/B58 again and shaved another 0.2s off 0-60 and BMW is now claiming 255hp/400nm (5.3) in the B48 and 382hp/500nm (4.3) in the B58 from the factory so there is definitely so more potential to be had.

Any thoughts on changing your factory heat exchanger? Since going air-to-water and away from an intercooler, i dont think there are a ton of heat issues but CSF makes a upgraded radiator tested to keep temps cooler but the factory one has done great for me, esp with the max cool setting in BM3.

https://csfrace.com/bmw-b58-cooling/
I have KN filter in factory airbox and I honestly think it’s best combo for the intake. Charge pipe doesn’t add any power. I have best plugs available for b48 - ngk 94201. As for meth, no I don’t have it and I think meth could be worth a try actually. I have stock m 18’’ rims and normal non run flat tires but nothing special.
I think 12.4 is very close to max performance with stock turbo. Maybe 12.3 but that would be very hard to do without cheats))

Don’t think couple of degrees decrease in iat is worth the price of a tuned heat exchanger.
Appreciate 0
      09-13-2020, 10:43 PM   #20
Luverse
Second Lieutenant
Luverse's Avatar
Indonesia
152
Rep
280
Posts

Drives: BMW F30
Join Date: Oct 2019
Location: Jakarta

iTrader: (0)

Quote:
Originally Posted by Dronamashina View Post
I have KN filter in factory airbox and I honestly think it’s best combo for the intake. Charge pipe doesn’t add any power. I have best plugs available for b48 - ngk 94201. As for meth, no I don’t have it and I think meth could be worth a try actually. I have stock m 18’’ rims and normal non run flat tires but nothing special.
I think 12.4 is very close to max performance with stock turbo. Maybe 12.3 but that would be very hard to do without cheats))

Don’t think couple of degrees decrease in iat is worth the price of a tuned heat exchanger.
standard factory airbox is the best for now
the car feel more responsive than using open billet intake
__________________
Instagram: nightfall.f30
Appreciate 1
      09-14-2020, 09:55 PM   #21
eff32fl
Private
eff32fl's Avatar
45
Rep
94
Posts

Drives: 2018 430i M Sport
Join Date: Jun 2020
Location: Florida

iTrader: (0)

Quote:
Originally Posted by Avaley View Post
Its also nearly a 10 year old data point and not a good comparison...since BMW went modular B series, B58 engine has won an award 5 out of last 6 years...B48 is the B58 with 2 less cylinders...

https://en.wikipedia.org/wiki/Ward%27s_10_Best_Engines

I'm trying to avoid a N20 vs B48 flame thread and focusing on B48 tuning specifically.



Drona, now that you have straight piped and did 12.4s before exhaust mods, I would dare to guess that the B48 stage 2, e50 with FBO is capable of a 12s 1/4 mile...you haven't done intake, charge pipe, spark plugs or methanol and what rims / tires?

In the 2021 G series this year, they up tuned the B48/B58 again and shaved another 0.2s off 0-60 and BMW is now claiming 255hp/400nm (5.3) in the B48 and 382hp/500nm (4.3) in the B58 from the factory so there is definitely so more potential to be had.

Any thoughts on changing your factory heat exchanger? Since going air-to-water and away from an intercooler, i dont think there are a ton of heat issues but CSF makes a upgraded radiator tested to keep temps cooler but the factory one has done great for me, esp with the max cool setting in BM3.

https://csfrace.com/bmw-b58-cooling/
Do you happen to have any video/audio recordings of the sound of your exhaust? Specifically wondering if you're getting decent burbles with BM3 Stage 1 with B48.
Appreciate 0
      09-15-2020, 11:26 AM   #22
RMMAGA
Private
42
Rep
56
Posts

Drives: 120i
Join Date: Sep 2018
Location: China

iTrader: (0)

damn those are some good times, best I got was 12.65 at 110.4mph, out here in southern china my DA is 2200ft, and with a 2.03 60ft that is about best case with RWD

running 26 psi, with my own tune, which I think is the most I am comfortable to run without building the engine

for the run above I turned off the meth, to monitor my turbo efficiency, got 350 deg F out with about 90 deg ambient air, at 26psi that works out to 66%, so still very reasonable, with 90% WGDC, I only have a modified compressor wheel, so i guess your efficiency is lower, but the DA would likely more then make up for that, and the that the inter cooler is really good

on a 0 to 120 run, with meth turned off my IAT only increases by about 8 to 10 degrees, for example on the run about it started at 120 deg and ended at 128 deg F

meth is odd, as it does not appear to gain any power, or gain much in IAT, maybe 4 to 5 deg based on my logs, the inter-cooler looks very good, I can see a little better timing with meth, and i run about e90 in the meth tank, if you can get good fuel like e30 that i am running, i dont think meth will do anything for you, do not bother if you do not have it already
Appreciate 0
Post Reply

Bookmarks

Tags
330i, 430i, b46, b48, bootmod3, f30, modification, stage 2, tuning

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 09:26 AM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST