Ran into a problem with my MAF
Thread Starter
TECH Enthusiast
Joined: Mar 2003
Posts: 618
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From: San Diego
Ran into a problem with my MAF Ok, I had my car pretty much on the dot VE and part throttle wise, I nailed down the VE table very well, then plugged the MAF back in and dialed everything in. This was about 10 months ago when I installed my cam. I broke some things doing heads a few months ago, finally got the car running last week, changes since I tuned it last were heads (5.3l 11.8:1) and ported throttle body. I reverified my VE table, tweaked it where it needed it (LTFTs looked good), and plugged the MAF back in. Now my LTFTs are 25 across almost all the cells down low and around 15 at higher rpms.
Can cylinder heads and a ported throttle body cause that much distortion in MAF readings or do you think my MAF sensor might have gone bad sitting around my garage for 4 months?
Can cylinder heads and a ported throttle body cause that much distortion in MAF readings or do you think my MAF sensor might have gone bad sitting around my garage for 4 months?
Thread Starter
TECH Enthusiast
Joined: Mar 2003
Posts: 618
Likes: 0
From: San Diego
I did several hours of VE logging and tuning today to nail down my VE table. This was with the MAF unlpugged. I checked it and blew compressed air across it when I was putting the car back together, it didn't seem dirty. Yeah, I double checked afterwards by unplugging it again, its the MAF.
I can scale my MAF table 25% or more higher to try and compensate or I can swap MAFs and see what happens, both of which I'll try tomorrow.
I have other problems too, I'm running 83% duty cycle on my injectors at 4300rpms (the highest I've had the car WOT yet)... lol
I'm going to swap MAFs tomorrow and see what happens.
I can scale my MAF table 25% or more higher to try and compensate or I can swap MAFs and see what happens, both of which I'll try tomorrow.
I have other problems too, I'm running 83% duty cycle on my injectors at 4300rpms (the highest I've had the car WOT yet)... lol
I'm going to swap MAFs tomorrow and see what happens.
Thread Starter
TECH Enthusiast
Joined: Mar 2003
Posts: 618
Likes: 0
From: San Diego
yeah, stocks... I didn't think I'd run out of injector till over 425rwhp, but who knows. I'm trying to track down some 28s that someone upgraded from just so I can get the car to the track 
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Originally Posted by RedHardSupra
don't get 28s, they're worthless for any sort of usual LS1 power. for up to 400rwhp get svo 30s (36.5#), for up to 500rwhp get svo 42s (48.5#)
Originally Posted by Bombguy99z28
Well, I'm broke right now, and I found someone local who is gonna give me his stock 98 injectors for the best price.
Thanks for the help everyone.
Thanks for the help everyone.
Glad you got the maf bug fixed. I think i'll take mine apart to find ouct what failed.
Dont forget to replace your IFR table with a stock unedited 98 table.
If you need one I can pm/email you mine.