BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > F series tuning
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      09-14-2017, 02:39 PM   #1
VESPER_125i
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F series tuning

Wondering whether to tune my F20 LCI 125i with N20 for a while. Have been told by both BMW mechanics and technicians that it is very hard to detect ECU tunes on the F series by both flash and piggy back.

Car is under warranty until 2021 and is in first year of ownership. Would like to have either a generic tune with pop and bang map or custom tune. Financially, I think JB4 would be more worthwhile. Anyone have any experiences with either JB4 or flash tune in regards with dealer and voiding of warranty?
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      09-15-2017, 07:24 AM   #2
1SolidF20
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You can buy a tune from BMW that will update the map to the one of the 228i. It cost 1400e in Europe. Then you can add a JB4 if you wish for 300+ hp.
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      09-15-2017, 08:10 AM   #3
VESPER_125i
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Not an option in Australia.
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      09-17-2017, 05:58 AM   #4
mmmmQuattro
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I've had JB4 and others with various BMW's over the years.
I don't believe it can be detected.
In many cases, the dealer knew it was there.


There's a couple of things to consider:
1. BMW mechanics are busy and want to get your car out of there as soon as possible, so they aren't going to plug your car into a scanner and go looking for a JB4. They might look for a tune on a 140.
2. You can remove it, before going in for a service.
3. If you have / get a check engine light or something like that, have your car towed to a place where you can totally remove all evidence of the JB4.

It's a risk, but so is life - if you want it, get it.
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      09-17-2017, 04:21 PM   #5
VESPER_125i
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Thanks for the reply mate. Do you think they would take age and other current modifications into account? Me being 21 with a custom 3" non-res catback mated to the M135i muffler; soon to be straight through.

Might bite the bullet after the second service next year.
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