Thread: Pre ignition
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      08-28-2019, 02:52 PM   #7
SapphireM5
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Drives: 2013 M5 Sapphire Black
Join Date: Feb 2017
Location: New Jersey

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Quote:
Originally Posted by SmokinJoe View Post
Also was wondering if a tune may help this issue by increasing the amount of fuel at lower rpms. Stock the afr is 14.7 at wot until almost 5k rpm then it tapers to 12.6 by redline. That seems a bit lean to me at least in the lower rpm. Looks like some of the tuned stuff runs a bit richer down low. Maybe that will help cool the combustion and drown out some of the pre ignition. I may try the stage one tune and do some logs to see how it reacts.
I would not be tuning the car until you figure out what is causing your issues. A tune can push you over the edge and these motors are not cheap. Find out what's wrong first, fix it then get a tune.
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'13 Black Sapphire Metallic - BPM Stage 1 Tune - RPI Exhaust - KW HAS Kit - 12mm spacers all around- Carbon Fiber front lip - High Kick Trunk Spoiler - Rear Roof Spoiler - IND Kidney and Fender Grills - 20% Tint all around 50% Front Windshield - PPF
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