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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Large timing corrections as IAT increases



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      06-30-2020, 09:39 PM   #1
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Large timing corrections as IAT increases

Anyone able to diagnose what's causing large timing corrections in two cylinders?
In my initial run there were no corrections:

https://datazap.me/u/1897/log-159335...23-24-25-26-27

but by the third run, IAT had increased and I started to get small corrections on 4 cylinders and very large (up to 7.5) corrections on cylinders 5 and 6

https://datazap.me/u/1897/log-159335...23-24-25-26-27

It was a hot day (mid to high 80's F) and I am still using a factory intercooler. Using 93 octane gas.

other mods:
Injen cold air intake and charge pipe (not sure of brand)
VRSF catless downpipes
MHD Stage 2 tune

Bosch plugs with 8k (according to PO) but have discoloring on all plugs.
aftermarket coilpacks 8k (according to PO) but have lots of discoloring on two
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      07-01-2020, 06:17 AM   #2
drwillb
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Factory intercooler has to go. Ambient temp is 80 but IAT is 127 at the end of the second run. Your engine is just trying to protect itself from you.

Last edited by drwillb; 07-01-2020 at 02:37 PM..
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      07-01-2020, 07:01 AM   #3
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The answers are in ur own post.
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      07-01-2020, 09:55 AM   #4
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you need a larger intercooler. I recommend VRSF 7.5" Comp or the Wagner EVO II Comp
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      07-01-2020, 05:17 PM   #5
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The DEM has safeties as the IATs rise. It will reduce timing and go rich to try and keep the temps under control. Once you're able to keep things cool then you can see if there is an underlying problem causing timing corrections. Honestly most people just want more out of the platform on pump gas.

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Intercooler
Methanol
Ethanol
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2011 E92 335i Auto 0-60=3.66 | 12.0@125MPH JB4 / 11.7@120MPH E30 MHD SOLD
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