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      09-15-2020, 01:49 PM   #23
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What is your timing with that kind of boost? You think engine can handle such power and boost? Also is your car 320 or 330 so what is your CR? 12.65 is very impressive for rwd!
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      09-15-2020, 06:26 PM   #24
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Originally Posted by eff32fl View Post
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.
There are burbles but I wouldn't call them decent with OEM parts with BM3 burble set to OTS...i don't really like revving for them with a stock cat tbh but i'll do a before after video when my exhaust comes.
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      09-15-2020, 11:13 PM   #25
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here is a log and draggy of my recent 1/4 run

https://datazap.me/u/rmtm/log-160022...22-25-26-27-28

still working on the tune, I am not sure why the AFR really dropped, it could be some protection like ECU thinks EGT is too high and start to reduce AFR target, need to work out solution to that

however it is interesting that even with low AFR power was still decent, timing was about 14 deg up top, I have 120i so CR is 11:1, running e30 + 98ron fuel

can you get any logs of your car I would love to see that to compare with mine, also if you can add in temperature out of the turbo, I can also compare your turbo efficiency to mine that may be interesting, of course with denser cooler air your turbo will do less work but it will still be interesting, make sure you log the parameter called something like "air intake before throttle"

note that you can see in the log there is no need for upgraded inter cooler, I am pumping 360 hot air at 26psi into it, and my IAT is very stable at about 117 min to 127 max without meth, that is very little change for 0-123 mph run, note with meth that is only marginally better like might reduce by 3-4 deg F.
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      09-15-2020, 11:23 PM   #26
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Quote:
Originally Posted by RMMAGA View Post
here is a log and draggy of my recent 1/4 run

https://datazap.me/u/rmtm/log-160022...22-25-26-27-28

still working on the tune, I am not sure why the AFR really dropped, it could be some protection like ECU thinks EGT is too high and start to reduce AFR target, need to work out solution to that

however it is interesting that even with low AFR power was still decent, timing was about 14 deg up top, I have 120i so CR is 11:1, running e30 + 98ron fuel

can you get any logs of your car I would love to see that to compare with mine, also if you can add in temperature out of the turbo, I can also compare your turbo efficiency to mine that may be interesting, of course with denser cooler air your turbo will do less work but it will still be interesting, make sure you log the parameter called something like "air intake before throttle"

note that you can see in the log there is no need for upgraded inter cooler, I am pumping 360 hot air at 26psi into it, and my IAT is very stable at about 117 min to 127 max without meth, that is very little change for 0-123 mph run, note with meth that is only marginally better like might reduce by 3-4 deg F.
I am shocked at that 26psi number and am personally worried about pistons / crankshafts breaking past 20psi
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      09-16-2020, 08:41 AM   #27
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Quote:
Originally Posted by RMMAGA View Post
can you get any logs of your car I would love to see that to compare with mine, also if you can add in temperature out of the turbo, I can also compare your turbo efficiency to mine that may be interesting, of course with denser cooler air your turbo will do less work but it will still be interesting, make sure you log the parameter called something like "air intake before throttle"

note that you can see in the log there is no need for upgraded inter cooler, I am pumping 360 hot air at 26psi into it, and my IAT is very stable at about 117 min to 127 max without meth, that is very little change for 0-123 mph run, note with meth that is only marginally better like might reduce by 3-4 deg F.
https://datazap.me/u/andreykropspb/e...9&mark=128-153
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      09-16-2020, 09:30 AM   #28
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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.


B48 is a much stronger, reliable engine and Big Boost Turbo have one running 422whp on stock internals with turbo upgrade (which is a lot more than any other N20 that I have seen.

Many users not really pushing the b48 platform but dragy results proven faster.
However the users who have those results have not tracked or no track access.
Hence the reason N20 is still on top.
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      09-16-2020, 11:00 AM   #29
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Originally Posted by SRHosein View Post
B48 is a much stronger, reliable engine and Big Boost Turbo have one running 422whp on stock internals with turbo upgrade (which is a lot more than any other N20 that I have seen.

Many users not really pushing the b48 platform but dragy results proven faster.
However the users who have those results have not tracked or no track access.
Hence the reason N20 is still on top.
Exactly...most are still in warranty and are 2019 or newer 330i.

Warranty is just now falling off in the next month for me with a 2017 purchase of a 2018 version so we are just at the beginning of the push but so far the results are promising.

Not a surprise as the B58 is capable of outputting 600bhp but im shocked at 422whp or 211 hp per litre, would imply some crazy output for S58 with twin turbos tuned.

Last edited by Avaley; 09-16-2020 at 05:11 PM..
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      09-16-2020, 04:05 PM   #30
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Wowzer. 422whp is excellent for a B46/48 with stock internals. I didn't think this engine could handle that much. I know A4 B9s that push those numbers with upgraded turbos and I'm glad BMW can do that to!
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      09-17-2020, 03:11 AM   #31
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Thanks here is what I can get form comparing the respective logs, you boost is not very high, on the stock turbo I think you can likely run even higher boost, but you may need to reduce timing a little if you want to run higher boost like 22 PSI should be OK on the stock setup with e50, and maybe with 17-18 deg of peak timing, however it may be arguable what would be faster.

DA Air Density Difference is 10% for 21 deg Iat in cold russia vs 51 deg Iat in hot southern china, so at the same boost you should have 10% higher cylinder loads. We will look at that more later on.

Turbo efficiency can be estimated by the pressure ratio, and the intake and output air temps of the turbo, as you did not have pre turbo intake temperature in your log I used the ambient outside air temp (Ta), to compare the same sensor data form both cars, however note that if done properly on my car, get 72%, your likely > 70% as well if you had the data on the pre turbo inlet temp

PR Iat Ta To Eff (Ta-To)
2.24 21 8 110 0.65
2.79 51 28 171 0.65

Our turbo efficiency is the same, and actually 65% is good using ambient as the intake temp, I have seen 50-60% in some of the B58 logs where people are pushing the stock turbo > 20 psi, so we are still in the good efficiency ranges of our turbos.

Here is looking at the VE "volumetric efficiency" and load. Here you can see that on average your VE is about 8% higher then mine, however given the 10% difference in Iat air density that is totally expected. In fact you could say my Iat compensated VE is 2% higher.

5500 RPM
PSI PR LOAD VE % VE diff %
16.8 2.16 188 87 108
25 2.72 219 80

6000 RPM
PSI PR LOAD VE % VE diff %
17.6 2.21 187 84 108
26 2.79 218 78

6600RPM
PSI PR LOAD VE % VE diff %
18 2.24 182 81 108
26 2.79 210 75

I am running about 30 points higher load on average then you are, which should all things equal give me about 15% more power.

However based on our 1/4 mile times, it looks like I only have a few percent more power, so the difference is likely down that 6 deg timing difference.

In fact I would say you have at least 10% more power then I do at a given load or fixed load, based on your more advanced timing. That tells me that if I get better fuel, and increase my advance I can get even faster! However I will also put more stress on the rods and pistons...... so probably I will not do that or if I do it will also reduce the boost a little.

Does anyone know if big boost posted any logs of the 422whp run, it would be cool to see what it takes to do that, I would guess like 18-20 deg of timing and like 26-28 psi of boost, with colder air would be needed for that.
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      09-17-2020, 03:42 AM   #32
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Very interesting! Thanks! Cold Russia ha ha)) yes here in st Petersburg we have good DA and cold temps so it’s good for performance. Maybe Jarek from mgflasher could make me better and more powerful tune, but I think he will go “more timing advance” route. Maybe 1 degree more... I’m not sure. Also I’m thinking of going from e50 to e60 but not sure if that will give any benefits.
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      09-18-2020, 02:28 AM   #33
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In general ethanol burns faster then gasoline, so running more ethanol overall is similar to running a little more timing, and additionally the higher octane also allows you to run more timing hence the big gains that you can get form even going form 98 to e20.

For example if I were to just increase form e20 to e30 I would likely gain 2-3 % just form the faster burn. However e50 to e60 will likely be at the point of diminishing returns both on the flame speed and on the octane, see below table it basically shows no octane advantage form e50 to e60

Also I think you are close to MBT at 20 degrees, if you look at the ECU timing tables, they have ideal timing at 19.75 deg at 7000 RPM
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      09-22-2020, 10:30 PM   #34
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Originally Posted by Dronamashina View Post
Very interesting! Thanks! Cold Russia ha ha)) yes here in st Petersburg we have good DA and cold temps so it’s good for performance. Maybe Jarek from mgflasher could make me better and more powerful tune, but I think he will go “more timing advance” route. Maybe 1 degree more... I’m not sure. Also I’m thinking of going from e50 to e60 but not sure if that will give any benefits.
What do you use for your xHP settings? I took custom boost to 20% feels fine, probably will reflash higher.
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      09-23-2020, 07:48 AM   #35
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Quote:
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What do you use for your xHP settings? I took custom boost to 20% feels fine, probably will reflash higher.
I use +25% both sliders.
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      09-23-2020, 09:43 AM   #36
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Quote:
Originally Posted by Dronamashina View Post
I use +25% both sliders.
Any other custom settings like take off in 2nd gear, etc?

Quote:
Originally Posted by SRHosein View Post
B48 is a much stronger, reliable engine and Big Boost Turbo have one running 422whp on stock internals with turbo upgrade (which is a lot more than any other N20 that I have seen.

Many users not really pushing the b48 platform but dragy results proven faster.
However the users who have those results have not tracked or no track access.
Hence the reason N20 is still on top.
Do you have a source of this? 422 whp seems high, although I believe it, Big Boosts' dyno only shows ~330whp for a B48.

Perhaps you are quoting a 330e?
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