Lexus IS Forum - View Single Post - What MAF do you high hp bOost guys use
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post #12 of (permalink) Old 03-17-2017, 06:08 PM
Join Date: Jun 2014
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Originally Posted by blkdout View Post
haha mine used to be off by 1/4 but now it's more like 1/2 tank. I think the float got bumped with the new pump. I fill up at E and it puts 7-8 gallons in.

The stock ECU only reads the float incrementally. The 1/4 drops on most turbo cars are simply because the MAF isn't there or working with the ECU to fill in the gaps with the float reading and/or the O2 sensors are gone as well. The smooth operation of the fuel gauge I believe is a combined calculation of the MAF and O2 readings.
Makes sense. I figured the stock ECU was missing some sort of sensor info since it's tough to keep it happy after a swap.

2002 Black Onyx IS300 5-speed w/LSD: GTE VVTi, AEM Infinity, BW S363, R154
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