Back off boost during winter?

Quebequer · 11-07-2012, 05:50 PM

Hi guys,
Temps are getting pretty low here, and I'm experiencing some timing drops issues. Mods are in signature, basicallely FBO+meth.
During summer, when temps were pretty high (25 celsius +), logs were looking very good with 45 to 50 meth add (17,3-17.8 psi, 91 oct, 70/30 meth mix).
Since its colder (more or less 0 celsius), I had to back off my meth add to 30 (15.8 psi) and even at 30, I have some timing drops on 4th gear logs.
I understand air is denser when colder, so it means more power. But would that mean we have to back down boost during winter because octane can't keep up? Any of you with the same issue? Anyone with an explanation?
Thanks a lot

Dr. G · 11-07-2012, 06:12 PM

I always back off boost in the winter because like you said, colder=denser.

Quebequer · 11-07-2012, 07:21 PM

Quote:

Originally Posted by Dr. G

I always back off boost in the winter because like you said, colder=denser.

Thanks for the answer.

max_k20 · 11-08-2012, 02:36 PM

Do this only apply on fbo car ? Running dci and cobb stg 1 sport (not agressive) would that be ok to run in winter ?

My first winter with the car

11-07-2012, 05:50 PM	#1
Quebequer Private First Class 6 Rep 140 Posts Drives: BMW Join Date: Apr 2012 Location: Quebec, Canada iTrader: (0)	Back off boost during winter? Hi guys, Temps are getting pretty low here, and I'm experiencing some timing drops issues. Mods are in signature, basicallely FBO+meth. During summer, when temps were pretty high (25 celsius +), logs were looking very good with 45 to 50 meth add (17,3-17.8 psi, 91 oct, 70/30 meth mix). Since its colder (more or less 0 celsius), I had to back off my meth add to 30 (15.8 psi) and even at 30, I have some timing drops on 4th gear logs. I understand air is denser when colder, so it means more power. But would that mean we have to back down boost during winter because octane can't keep up? Any of you with the same issue? Anyone with an explanation? Thanks a lot __________________ 2008 BMW 335xi MT e90 JB4 G5, WW meth kit, turbonetics intercooler, DCI, UR catted dp's, UR catback, koni yellow + H&R springs, Rieger front bumper, Avant Garde 19" wheels
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11-07-2012, 06:12 PM	#2
Dr. G Major General 278 Rep 5,062 Posts Drives: Black e92 335i Join Date: Apr 2010 Location: Brampton, Ontario iTrader: (32) Garage List e92 BMW 335i [8.84]	I always back off boost in the winter because like you said, colder=denser. __________________ JB4 / OSS Angel Eyes / Downpipes / F1-Racewerks FMIC / Custom Meth Kit / BMS DCI / ER Chargepipe / HKS BOV / BMS Meth Elbow / BMW Performance Exhaust / Carbon Fiber Inlay Quad Tips / 19" Miro 111 / Front Aero Lip / M3 Sides / VRS CSL Trunk / Mtech Rear / DD CF Quad Finned Diffuser / LCI Tails / BBK / Smoked Reflectors / F1 Euphoria LED Interior / License LED's / GT 5000k Corners / 5000k HID Fogs / Air Scoops / LED Turn Signals / FK Silverline Coilovers / HPA endlinks / Vibrant Resonators / Osram CBI 5000k D1S
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11-08-2012, 02:36 PM	#4
max_k20 Bavarian Love 24 Rep 263 Posts Drives: 230i xDrive Join Date: Mar 2012 Location: Quebec, Canada iTrader: (2)	Do this only apply on fbo car ? Running dci and cobb stg 1 sport (not agressive) would that be ok to run in winter ? My first winter with the car __________________ 08 FG2 Civic SI FBO - SOLD 09 E92 335i Xdrive FBO - SOLD 17 F22 230i Xdrive \| Alpine White \| Coral Red \| M-Sport \| BMS Intake \| JB4 \| 666M Rep \| M Carbon Mirrors \| Roof Rack \| Daily Driven
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