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Well I borrowed a friend of mine's scanner, and took the car out on a scanning run. I'm running 6psi on a powerdyne with a 6:1 FMU. At WOT past 4k RPM's I get knock, and it maxes out at 9 degrees....bad... So I was looking at my sensor info, and my MAP maxed out at 0 lbs of boost, when I'm clearly making 5-6 pounds, which makes sense though because its a N/A engine, so at WOT naturally aspirated manifold pressure would never go above 0 pounds. So this being said, my PCM has no idea im even under boost because the MAP maxes out, so do I need to get a new one that can sense boost? Also, the MAF maxes out around 4kRPM's also, so similar problem... I know I need a tune, but will I need a new MAP that can sense boost and a MAF that can handle more air flowing past it? Thoughts?
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1999 Firebird Y87/W68 -
Re: Scanning Run
Don't quote me on this, and that said if i remember correctly i think you can retain factory MAP and MAF, you just have to change some values stored in your PCM. I was talking to my tuning guy not to long ago about possibly going with some sort of FI and i am pretty sure he said i would not have to replace them. Again there is a good chance that i am very wrong about this so don't take what i said as fact.
Heres a link to TurboV6Camaro's tuning page that covers this tuning issue, hope it helps. :)
Serious thanks to him for putting all that together!
http://www2.turbov6camaro.com:443/maf.htmDaily: '02 Black Yukon Denali
Toy: '06 Torrid Red GTO
Gone: Powerdyned '02 Pewter Camaro
Gone: '07 Charcoal Yamaha R6
Gone: Ex-wife, lol -
Re: Scanning Run
Are your maf readings over 37.00, I know I ran 8-10 psi and only got up to 33.00-35.00 readings with my powerdyne.08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
96' Camaro M5 to A4 conversion, alot of mods . GT35R Turbo full suspension. Built engineComment
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Re: Scanning Run
If your PCM is pulling 9* of timing because of knock you need to pull some out. That's just about all the PCM can pull even though the stock table says 11.sigpic
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Re: Scanning Run
yeah, im getting it professionaly tuned next week by a guy that is well known for tuning GTP's and turbo Grand Prix's so im sure he'll know what hes doing. i was just wondering if there was any new sensors id need to pick up. i figured i wouldnt though, since the MAP isnt really relied on by the PCM at WOT.
1999 Firebird Y87/W68Comment
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