[Morpheus]

STILL waiting for all of the "JBx blew my motor" posts....

[jaimito2222]

I am a newbie here and enjoying the first couple weeks of my 335i... that being said I take interest in the above statement. What evidence is there that the JB4 has been causing any issues? Are there records of blown motors from JB4 installs? I am really interested in purchasing one, but am also scared of long-term reliability.

From what i've read so far everyone likes to do ECU's first; obviously because of bang for the buck. If we were to go the "safer" route is it safe to assume that I am better off upgrading intercooler, intake, DP's and exhaust before doing a tune? Wouldn't this create a "safer" environment for a tune?

Once again forgive me if I am totally off, but I am a newbie and just want to understand this completely before making a decision.

[mithiral67]

The above comment was sarcasm. On a whole, the n54 ecu is very very good at protecting the engine from harm, regardless of the methods of tuning. As there hasn’t been a wide scale (or even small scale) failure of our engines, there is a general lack of evidence that “poor” tuning methods on our cars will cause harm.

This is all assuming that all issues are reported and sufficient miles on each popular tune have been logged and proved to be safe.

As there are probably 10k+ jb3/4s on the road, I think anyone would be hard pressed to say, hey, if you go jb4, your engine will be fired in 10k miles.

Going tune first is fine as long as you run stage 1 maps. These engines are very detuned from the factory and have a lot of room for increase on the stock hardware.

[jaimito2222]

thanks for the input...

[roberts5831]

does the PROcede have a way of modifying timing during increasing load and different enviromental factors?

[bionet]

Awesome write up. Appreciate it.

[Morpheus]

Still lmfao at these "pro" tuners.

[type rrr]

need help with atr and boost control !!

i would like to ajust my boost curve ( keep boost to redline )

will it help adding 2% at the WGDC adder (air flow) --- the last column ( 278) replace 6.00 by 8.00 ?

or-and WGDC ceilling ( adder ) last column ( 333 ) replace 7.00 by 9.00
thank s

[type rrr]

ok, i will have to forget that,cobb email me back and said those turbos wont hold that boost to redline

[suprchrgd]

i'm liking this forum more and more as i read through all the information you guys have put together on here. great writes up for new and seasoned enthusiast...

[JLiusifer]

great info!

[Tdanderson]

Ok, just so i have this straight. The cobb and PROceed adjust timing based on load. But the JB4 relies on the knock sensor to adjust timing?

[K.david]

Thanks for taking the time to write up such an informative post, and everybody else that chimed in.

[Mike@N54Tuning.com]

Originally Posted by Tdanderson

Ok, just so i have this straight. The cobb and PROceed adjust timing based on load. But the JB4 relies on the knock sensor to adjust timing?

That info is all a few years out of date now. After Vishnu made such a big deal about CPS despite the ~15,000 JB3/JB4 cars who have run without it for years BMS decided to just add it for those that want it. So the JB4 G5 has CPS support now, and large turbo customers now use the BMS back end flash which has dramatically revised advance tables.

Mike

[dandog]

Hi all,

My car runs perfectly, no issues anywhere it was reading 298bhp on the first dyno run with no fault codes or errors. Then the new aggressive map was put on it. I should of got around 360bhp at least out of the map. But when dynoing with the new map it started of well. A good 20-30bhp than standard and torque was exceptional higher. However when hitting the 3500 rev the pressure dropped, this was shown on his diagnostic kit that was monitoring the engine. When it hit 200Psi the pressure dropped and the bhp levelled off. However there were no codes and no faults shown. How can I find out what the issue is? was it a mapping fault or was there a technical issue with a or some parts in my engine?