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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 > JB3 vs JB4



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      05-20-2012, 09:09 AM   #1
BobVader
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JB3 vs JB4

my 335xi are on jb3 (18ohms) + fbo+ meth since 2 years. All work fine. I run daily on map 8 and 94oct + meth and log are perfect. Car pull very strong. At dragstrip I run on map 13 + ms109 and perfect too. Never limp. I never upgrade to jb4 because I have a gauge that work only with jb3 (psi and intake temp) and I like this gauge. The only bad thing is sometime the car bog between shift (2-3 and 3-4)...like slip clutch (feeling)

for info on dynapack dyno on jb3 :

FBO + map 0 on 94oct = 301whp
FBO map 8 + 94oct + meth = 426whp
FBO map 13 + ms 109 + meth = 449 whp

with jb4 ???


I have jb4 (15 ohms) on the table but if I install this one I will lost my gauge... I have many questions:

1- I can run on map 7 on 94oct + meth for daily ? (because map 8 on jb3 are probably more strong than map 2 on jb4 (maybe?)

2- In term of pure performance (0-100 mph, 1/4 mile...) More perf on jb4 or will be the same ?

3- At dragstrip map 7 ( with by exemple max boost set at 19psi) will be more strong that map 13 on jb3 ?

Thanks for your help. I see the jb4 on my table and I have the tentation to install....

** sorry for my english...french canadian**
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'08 BMW 335xi // Sedan // Black Sapphire // Sports Package//Mods: JB3 2.0|Unlocked 18ohm Board|BMS Meth Kit|AA Speed Delimiter|BMS tuning gauge|UR CL DP |BMS DCI|AA Exhaust|Helix fmic|CDV|H&R coilover| 10mm Spacers H&R on 4 wheels|**Record for XI's on dragtimes.com, 11.768s@118.70**Top speed 186,4 mph GPS, vbox 60-130mph at 10.18
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      05-20-2012, 11:43 AM   #2
Beemw335
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Boost is boost, jb4 will probably make the exact same power if it runs the same boost, but it will be much smoother than jb3 for sure.
If you have it, try it out, and if you like it then leave it, if you dont like it then put back jb3.
Btw what track do you go to? Mirabel? Napierville?
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      05-20-2012, 02:05 PM   #3
BobVader
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Quote:
Originally Posted by Beemw335 View Post
Boost is boost, jb4 will probably make the exact same power if it runs the same boost, but it will be much smoother than jb3 for sure.
If you have it, try it out, and if you like it then leave it, if you dont like it then put back jb3.
Btw what track do you go to? Mirabel? Napierville?
Napierville, Mirabel et St-Eustache. Suis deja allé aussi a Pont-Rouge
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'08 BMW 335xi // Sedan // Black Sapphire // Sports Package//Mods: JB3 2.0|Unlocked 18ohm Board|BMS Meth Kit|AA Speed Delimiter|BMS tuning gauge|UR CL DP |BMS DCI|AA Exhaust|Helix fmic|CDV|H&R coilover| 10mm Spacers H&R on 4 wheels|**Record for XI's on dragtimes.com, 11.768s@118.70**Top speed 186,4 mph GPS, vbox 60-130mph at 10.18
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