MAF Flow vs. Frequency?
Thread Starter
TECH Resident
Joined: Oct 2006
Posts: 993
Likes: 173
From: Euless, TX
MAF Flow vs. Frequency? Hello everyone. I am new to this site, but not to ECM/PCM tuning. I am working on a project of running TBI off of a Mass Air Flow sensor. A member of Thirdgen.org supplied me with the calibration for the newer bigger style LS1 sensor. I am actually trying to find the GM calibration used for the MAF sensor used in the 1994-1998 F-bodies and 1996-2002 Vortec trucks. If anyone can point this out it would be appreciated.
Thanks,
Chris
BTW, this is what I found for the 99+ LS1 sensor
It currently runs, but runs VERY LEAN at idle to the point of turning on the Service Engine Soon light (code 44 lean) with the LTFT in the 145 range (108 rich/ 128 no correction/148 lean).
Thanks,
Chris
BTW, this is what I found for the 99+ LS1 sensor
It currently runs, but runs VERY LEAN at idle to the point of turning on the Service Engine Soon light (code 44 lean) with the LTFT in the 145 range (108 rich/ 128 no correction/148 lean).
Last edited by Fast355; Oct 17, 2006 at 09:48 PM.
I cant see the picture.
Damn 145 trims, thats kinda lean.
. Sorry i dont have an Lt1 MAF table for ya, or a truck table. I can give you a stock 2000 LS1 table from a trans am.
Damn 145 trims, thats kinda lean.
. Sorry i dont have an Lt1 MAF table for ya, or a truck table. I can give you a stock 2000 LS1 table from a trans am.
Originally Posted by Fast355
A BLM reading (old LTFT) reading of 145 is roughly like +15% LTFT on the LS1 type PCM.
Thread Starter
TECH Resident
Joined: Oct 2006
Posts: 993
Likes: 173
From: Euless, TX
I know it is kinda on the lean side.
FWIW, here is what it is running. 10:1 355 out of a 4 bolt main Vortec 350(ZZ4 forged crank, Vortec PM rods, and Flattop Hyper pistons), Dart 180s, PRODUCTION LT4 cam, 2" bored edelbrock 3704, BBC TBI with 68# injectors at 30 PSI, 1 3/4" x 3" headers, 2 1/2" duals, X-pipe, 2 1/2" cats, 2 1/2" duals with flowmaster 40 series mufflers and custom prom tuning using the $0D PCM code. It is in a 5,500 lbs G-van with the aerodynamics of a brick. Its getting 18 MPG highway and With the speed density calibration it pulled this reading on the dyno. First run through the full exhaust, second through the cut-outs.
FWIW, here is what it is running. 10:1 355 out of a 4 bolt main Vortec 350(ZZ4 forged crank, Vortec PM rods, and Flattop Hyper pistons), Dart 180s, PRODUCTION LT4 cam, 2" bored edelbrock 3704, BBC TBI with 68# injectors at 30 PSI, 1 3/4" x 3" headers, 2 1/2" duals, X-pipe, 2 1/2" cats, 2 1/2" duals with flowmaster 40 series mufflers and custom prom tuning using the $0D PCM code. It is in a 5,500 lbs G-van with the aerodynamics of a brick. Its getting 18 MPG highway and With the speed density calibration it pulled this reading on the dyno. First run through the full exhaust, second through the cut-outs.
