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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Is the jb4 completely safe?



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      08-03-2013, 09:50 AM   #23
straightcashhomie
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Quote:
Originally Posted by 914kid View Post
I am in the same boat and I love the way a JB4 335i drives but for the time being I have decided against it. This car is fast already and has been decently reliable I am afraid after getting the tune I will potentially ruin the reliability.

Another less "risky" option to look at is that alpina transmission flash if you have an auto.
Lol at the car is fast already.... I was jb4d within my second week of owning the car.. Been 10k miles since. Stock 335 is slow !!
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      08-03-2013, 06:49 PM   #24
gazzetta
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Quote:
Originally Posted by straightcashhomie
Quote:
Originally Posted by 914kid View Post
I am in the same boat and I love the way a JB4 335i drives but for the time being I have decided against it. This car is fast already and has been decently reliable I am afraid after getting the tune I will potentially ruin the reliability.

Another less "risky" option to look at is that alpina transmission flash if you have an auto.
Lol at the car is fast already.... I was jb4d within my second week of owning the car.. Been 10k miles since. Stock 335 is slow !!
And you weren't concerned of anything going wrong with it?
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      08-03-2013, 07:22 PM   #25
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Just because something can go wrong doesn't mean its likely to go wrong. The n54 internals are way over built for what you are going to be asking out of the engine. Most of the things that will go wrong are wear items that will need replaced anyway you just might have to replace them a little sooner is all. There are tons of modded n54s and very few major problems as a result and most of them were people that track there car.
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      08-03-2013, 07:53 PM   #26
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Originally Posted by mrvegas View Post
I just bought a 2011 335d. Will the Alpina Transmission flash work on my car, a diesel?
Although the ratios are the same, it's not the same transmission as the ZF in the 335i. Not sure at all; I think there's a discussion somewhere but no resolution.
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      08-03-2013, 09:47 PM   #27
gazzetta
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I might do this tune. I went to a local shop and the owner was telling me he has a tune for my e93 that out performs the jb4, I forgot what it was called. It required sending my vin to Texas and getting the flash encryption back- something along those lines. 90hp and 120tq gains. Sound familiar?
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      08-03-2013, 09:49 PM   #28
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Originally Posted by Dan_335 View Post
Modifying any car is not 'completely safe' however the Jb4 is a great bit of kit
+1
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      08-03-2013, 09:54 PM   #29
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Quote:
Originally Posted by gazzetta
I might do this tune. I went to a local shop and the owner was telling me he has a tune for my e93 that out performs the jb4, I forgot what it was called. It required sending my vin to Texas and getting the flash encryption back- something along those lines. 90hp and 120tq gains. Sound familiar?
Never heard of it but shit... do share when you have a chance
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      08-03-2013, 11:11 PM   #30
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I wouldn't mess with the transmission flash..you're stepping into a different court. My good friend is a head mechanic at an independent shop now and was at a BMW dealer. He has the same exact software and reading devices that the dealer has...yesterday I cleared my codes and removed the JB4, nothing came up at all on his system. This is if they are looking for it too. Rarely will a mechanic dive into your ECU either but you never know, they are always curious. The JB4 made my N55 335 M sport a new car, period. I have two years left of manufacture warranty and a CPO warranty...I plan to keep the tune in and for $500, it's easy.
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      08-03-2013, 11:27 PM   #31
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I will keep this thread posted on the name of this tune. He was speaking in code mentioning all these map settings. I felt really dumb lmao
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