[F30Unit]

Hello all,

Last year I owned a 17 320i which had the N20 engine as the US didnt get the B48. I was ready to tune that car after a lot of research but covid hit and I ended up selling it. Anyways Im currently eyeing either another 320 2018 most likely or a 330i 17/18.

I ran the vin code and it shows that they got the B46 engine. I was wondering if anyone has any tuning experience with that car/engine and what they're opinions are. Also I remember the N20 has 11:1 compression but the N26 if im not mistaken was 10:1, is the b46 also 10:1?

Personally if I go with the 320 I definitely would want to go to stage 1 as it desperately needs it, but if I go with the 330i I'll probably focus more on cosmetic upgrades as 250hp should be enough to have fun in.

Let me hear your opinions and what to look out for in the 330i thankss

[Billfitz]

IMO if you're looking at a 330 with an eye to modding it just get a 340, but as you said a stock 330 is far better than a stock 320 anyway.

[F30Unit]

Originally Posted by Billfitz

IMO if you're looking at a 330 with an eye to modding it just get a 340, but as you said a stock 330 is far better than a stock 320 anyway.

I feel ya, yeah what I meant was 320 needs a tune but a 330 is already great without one.

If you were referring to my title, I just wanted to know how capable/ reliable the engine is compared to the N20

[anotheran]

B48 doesn't take a tune as well as the n20. You didn't tune that, don't bother tuning a 330i. Just buy a 340i. Depreciation made them cheap

[Boundless46]

Originally Posted by anotheran

B48 doesn't take a tune as well as the n20. You didn't tune that, don't bother tuning a 330i. Just buy a 340i. Depreciation made them cheap

I made 253whp/314wtq on BM3 Stage 1 with no other mods on my 2017 330i B46. I just switched over to MG Flasher which feels really good and I am installing my downpipe this week. I will be getting new dyno numbers soon.

[F30Unit]

Originally Posted by Boundless46

I made 253whp/314wtq on BM3 Stage 1 with no other mods on my 2017 330i B46. I just switched over to MG Flasher which feels really good and I am installing my downpipe this week. I will be getting new dyno numbers soon.

Great to here, those are great numbers!! Currently searching for a well packaged 330, unfortunately they do make those cars with the halogen headlights

[Luverse]

Originally Posted by anotheran

B48 doesn't take a tune as well as the n20. You didn't tune that, don't bother tuning a 330i. Just buy a 340i. Depreciation made them cheap

you saying based on what fact?

i have experience in both engine
N20 - piston on cyl 3 blew on BM3 Stage 2 with only less than a thousand miles on it
B48 - have been fine for 1.5 years witb BM3 Stage 2, even i take the car to drag strip 2 times, no problem so far, and have run 10k miles

both with full FBO, stock internal, and same brand fuel (even same petrol station)

[anotheran]

Originally Posted by Luverse

you saying based on what fact?

i have experience in both engine
N20 - piston on cyl 3 blew on BM3 Stage 2 with only less than a thousand miles on it
B48 - have been fine for 1.5 years witb BM3 Stage 2, even i take the car to drag strip 2 times, no problem so far, and have run 10k miles

both with full FBO, stock internal, and same brand fuel (even same petrol station)

sorry to hear about your experience with the N20.

i base it on stats from tuners

N20 Dinan Dyno: 268 hp
B48 Dinan Dyno: 254 hp

N20 BMS Dyno: 233.7 hp
B48 BMS Dyno: 230.68 hp

BM3 on N20
N20 (low-compression 28i)
Stage 1 91 octane: 16%HP / 20%TQ
Stage 1 93 octane: 18%HP / 22%TQ
Stage 2 91 octane: 20%HP / 24%TQ
Stage 2 93 octane: 22%HP / 25%TQ
Stage 1 E30 octane: 21%HP / 24%TQ
Stage 2 E30 octane: 25%HP / 27%TQ

BM3 on B48
Stage 1 91 octane: up to 14% HP / 26% TQ
Stage 1 93 octane: up to 16% HP / 26% TQ
Stage 1 E30 octane: up to 20% HP / 28% TQ
Stage 2 91 octane: up to 16% HP / 28% TQ
Stage 2 93 octane: up to 18% HP / 28% TQ
Stage 2 E30 octane: up to 22% HP / 30% TQ

[Luverse]

Originally Posted by anotheran

sorry to hear about your experience with the N20.

i base it on stats from tuners

N20 Dinan Dyno: 268 hp
B48 Dinan Dyno: 254 hp

N20 BMS Dyno: 233.7 hp
B48 BMS Dyno: 230.68 hp

BM3 on N20
N20 (low-compression 28i)
Stage 1 91 octane: 16%HP / 20%TQ
Stage 1 93 octane: 18%HP / 22%TQ
Stage 2 91 octane: 20%HP / 24%TQ
Stage 2 93 octane: 22%HP / 25%TQ
Stage 1 E30 octane: 21%HP / 24%TQ
Stage 2 E30 octane: 25%HP / 27%TQ

BM3 on B48
Stage 1 91 octane: up to 14% HP / 26% TQ
Stage 1 93 octane: up to 16% HP / 26% TQ
Stage 1 E30 octane: up to 20% HP / 28% TQ
Stage 2 91 octane: up to 16% HP / 28% TQ
Stage 2 93 octane: up to 18% HP / 28% TQ
Stage 2 E30 octane: up to 22% HP / 30% TQ

oh i see, what you mean is dyno figures. I thought you were leaning towards the engine realibility.

Maybe the figures is higher because its base on low-comp N20?
since B48 all has high comp, both in 320i and 330i (at least it is in my country) CMIIW

[sspade]

@Luverse

Join and post slip here. We could use some more B48 entries.

https://www.facebook.com/groups/244324833434651/

[Luverse]

Originally Posted by sspade

@Luverse

Join and post slip here. We could use some more B48 entries.

https://www.facebook.com/groups/244324833434651/

ah facebook group, i have to try to remember my fb account first