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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 > jb4 iso



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      01-04-2013, 03:21 PM   #1
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who else thinks that jb4 g5 iso is killing our mpg lol,tried to stay under 3k rpm and still only got 220miles on a full tank.
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      01-04-2013, 03:30 PM   #2
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I have not done the JB4 update and my gas mileage is still shit. Full bolt as well.
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      01-04-2013, 03:41 PM   #3
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Originally Posted by Dmoney0823
I have not done the JB4 update and my gas mileage is still shit. Full bolt as well.
before iso upgrade it wasnt this bad but now my car does 12 mpg lol and im not even abusing it
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      01-04-2013, 07:17 PM   #4
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run ISO 11C firmware with a wastegate position value at "0" and you'll see up to 37mpg on the OBC w/ 93octane steady state flat road at an indicated 75mph (no joke)
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      01-04-2013, 07:21 PM   #5
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      01-04-2013, 07:26 PM   #6
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Im not having any issues running the G5 ISO whatsoever with gas mileage. I run a 40% E85 mix/93 and still manage 17-18mpg and I'm FBO+RB's
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      01-04-2013, 08:00 PM   #7
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20-21mpg no change from pre ISO
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      01-05-2013, 12:14 AM   #8
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Quote:
Originally Posted by gzim335 View Post
before iso upgrade it wasnt this bad but now my car does 12 mpg lol and im not even abusing it
You do understand winter blend gas gets worse gas mileage than summer blend, right?

Other than that, ISO is extremely boost happy. Set wastegate position to 0 and future use A = 50 and you'll see your car get better gas mileage heh.
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      01-05-2013, 04:05 AM   #9
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Quote:
Originally Posted by themyst
Quote:
Originally Posted by gzim335 View Post
before iso upgrade it wasnt this bad but now my car does 12 mpg lol and im not even abusing it
You do understand winter blend gas gets worse gas mileage than summer blend, right?

Other than that, ISO is extremely boost happy. Set wastegate position to 0 and future use A = 50 and you'll see your car get better gas mileage heh.
i dont want it to get too laggy lol,but if thats what it takes
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