[electro-house]

Right now I am in a 2011 335i sedan loaner, and this vehicle has a considerably less amount of turbo lag in comparison to my 08 335i coupe.

The difference is not subtle here, it's very noticeable. Is there something wrong with my car, or has turbo lag improved this much with the newer models?

[Syndicategt]

2011 is a N55 and the 2008 is the N54 engine. I beleive the N55 has more torque down low so thats what you may be feeling. Also, the software could be different causing you to feel this.

[electro-house]

Damn the n55 sure is nice!

[tbracing]

I have the N55 and compared to my friends N54 I noticed that my car has less lag then his. I guess sometime 2 turbos isnt better than 1

But the N54 is a nice engine, hope they will soon come out with the same mods like the N54 has.

[Edward]

This thread reminds me of the fact that the N54 vs N55 battle threads have seemed to really come to an end.

[ericlol]

Originally Posted by Edward

This thread reminds me of the fact that the N54 vs N55 battle threads have seemed to really come to an end.

@@

who won in the end?

wheres the post?

[Edward]

N54 won in a unanimous vote because 2 is better than 1

[ericlol]

2 is better for mods and tunes...

[Neutrino45]

Are you still on the original tank of gas? I've noticed that the performance of my 335 loaner improved after I refilled the gas tank. I'm guess the previous user put regular gas in it?

[tomz17]

Originally Posted by WhiteFlood

Right now I am in a 2011 335i sedan loaner, and this vehicle has a considerably less amount of turbo lag in comparison to my 08 335i coupe.

The difference is not subtle here, it's very noticeable. Is there something wrong with my car, or has turbo lag improved this much with the newer models?

If you have an early model 2008, then you may have had the infamous "wastegate software fix" that increases lag substantially. Search for it!

[tunachris]

So souldn't 3 turbos be even better?

[RaceBlood]

2 is better that four, as in doors....

[DeepD.Fast.Rider]

n54 's software release since 2009 dims down effectiveness the small turbo significantly. The small turbo caused a massive load on the HPFP hence so many failures according to BMW...it might be true, it might be BS...but yea, they have released that in their softwares to increase life of HPFP so less get claimed under recall/warranty...sneaky trick to keep the masses quiet.

cant comment on the N55, I just dont like it simply from all the reviews Ive read, its too controlled. N54 can be tuned, and its a lot more resiliant.

[Wild Squid]

Originally Posted by deepak.j

cant comment on the N55, I just dont like it simply from all the reviews Ive read, its too controlled. N54 can be tuned, and its a lot more resiliant.

I don't know how you can say the N54 is more resilient with all the HPFP issues. My dealer says the N55 hasn't had any HPFP issues come in. It'll take time to tune it, just because there aren't many choices right now doesn't mean there won't be next year. It also may not make as high peak HP as the N54 but the power curve is almost identical between the two, and that is what really matters.

[michaelalex17]

i believe the n54 and n55 use the same fuel pumps. 466 is the newest pump u can get in the n54 and i believe u get it in the n55 as well

[electro-house]

Originally Posted by Neutrino45

Are you still on the original tank of gas? I've noticed that the performance of my 335 loaner improved after I refilled the gas tank. I'm guess the previous user put regular gas in it?

No, it's the loaner car that doesn't have the turbo lag, it's my own car that does.

[tomz17]

Originally Posted by deepak.j

n54 's software release since 2009 dims down effectiveness the small turbo significantly. The small turbo caused a massive load on the HPFP hence so many failures according to BMW...it might be true, it might be BS...but yea, they have released that in their softwares to increase life of HPFP so less get claimed under recall/warranty...sneaky trick to keep the masses quiet.

Anything to back this up, or is just just some conspiracy theory.

As I mentioned in a previous post, BMW did introduce a software update (29.2) that holds the wastegates open longer on older 335's (AFAIK they eventually fixed this with new wastegate hardware in the later 2008 cars). This eliminates the rattle issue on these older wastegates but also adds a bit of lag. The software update has an option that allows the dealer to retain the old wastegate functionality while performing the update.

Are you sure you're not just confused?

Originally Posted by deepak.j

cant comment on the N55, I just dont like it simply from all the reviews Ive read, its too controlled. N54 can be tuned, and its a lot more resiliant.

Your adjectives make no sense... controlled? resilient? These words you use; I don't think you know what they mean.


The N55 and N54 *should* drive very similarly. If the OP is seeing a major difference between his 2008 and the new N55 loaner then there could be something wrong with his car. I recommend he resets the accelerator calibration and checks whether his car had the 29.2 upgrade with the wastegate fix.

[Blacksapphiref06]

Originally Posted by tunachris

So souldn't 3 turbos be even better?

Make that 4 please. :

[henry418]

And here I thought my N55 has too much turbo lag..

[DeepD.Fast.Rider]

Originally Posted by tomz17

Your adjectives make no sense... controlled? resilient? These words you use; I don't think you know what they mean.

ok, i dont want to turn this into a personal issue, but watch it! If you want to be gramatically correct, read the dictionary...

FYI

1) the n55 has a single turbo vs the n54 having a twin turbo....common sense twin will have a quicker accel with the right software.

2) independant testers and people have reported the measured hp at the wheels of a new n54 is somewhere like 315+ and the n55 is 310+ , with the accel of the n54 quicker then n55 , as i said, i personnaly cant vouch for it, but read the forums, internet posts and you can find that out for yourself, its on wikipedia too...i needent say more. So maybe controlled is my way of saying single turbo, software to control turbo,fuel,etc thus power

3) resilliant, perhaps not the best choice of words, what i was trying to say in is its a stronger engine, and can perform better in theory than n55 for power.

4) the n55 was also developed to lower emissions cause i dont know about the US but in europe your road tax is based on your emissions. They focused on mastering one engine rather than the 335, 330 and 325(2.5l) in europe. In 2008 the 3 series only has 2 engines , 2l and 3l but before 2008 they had 3 , 3l (335 & 330) , 2.5 (325) , 2l (320) . We never saw the 328 in uk atleast.

Try not to knit pick my english, im not writing a poem, im trying to give technical info here what ive read and discussed with technicians.

[DeepD.Fast.Rider]

Originally Posted by tomz17

Anything to back this up, or is just just some conspiracy

My 2 335 s , one from 2006, second 2008, felt massive diff after hpfp change. Had no wastegate issues on either.

And i did say it could be bs. But again, what ive read and discussed with other owners.

[plague]

Originally Posted by Wild Squid

I don't know how you can say the N54 is more resilient with all the HPFP issues. My dealer says the N55 hasn't had any HPFP issues come in. It'll take time to tune it, just because there aren't many choices right now doesn't mean there won't be next year. It also may not make as high peak HP as the N54 but the power curve is almost identical between the two, and that is what really matters.

oh please. stop with the hpfp complaints. its old news. they fail.. mine hasnt. some will.. some wont. some might. yours did? oh. so what. ITS COVERED.