Another 10 second street car...
Originally Posted by Got Me SOM
12 psi sounds really low for the bfg's never heard of anyone running at that low a psi.
Thread Starter
10 Second Club
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From: Reynoldsburg, Ohio
Mark: It's all in the pulley, thanks for selling them to me 
asnxps2: I'm not sure. Anyone else wanna chime in?
99SS-T: Remember, I'm maxed on the MAF and my A/F WILL NOT go above 10.2:1, not at all. Three hours of tuning were to no avail. I think I would have been around 550ish rwhp if we could have gotten the A/F around 11.5:1. However, the car hauls like a freight train in the mid and top ends
streetbad: I've been running 12psi in the tires for almost a year now without problems. Hell, the diff fluid is what's been in there since I was NA three years ago. I'll tell ya what, though. That $500 ZT posi holds up quite well along with those GM gears. But I'm not counting on them taking this kind of abuse forever.
asnxps2: I'm not sure. Anyone else wanna chime in?
99SS-T: Remember, I'm maxed on the MAF and my A/F WILL NOT go above 10.2:1, not at all. Three hours of tuning were to no avail. I think I would have been around 550ish rwhp if we could have gotten the A/F around 11.5:1. However, the car hauls like a freight train in the mid and top ends
streetbad: I've been running 12psi in the tires for almost a year now without problems. Hell, the diff fluid is what's been in there since I was NA three years ago. I'll tell ya what, though. That $500 ZT posi holds up quite well along with those GM gears. But I'm not counting on them taking this kind of abuse forever.
When you say that you are maxed on teh MAF waht does that mean? Can you nto tune a stock maf'd car for more then 530ish HP? I hope that is not the case. I dont wanna have to buy a new setup when the turbo gets here in a week. GL
John
John
the MAFs in the 98's cant read as high as the 99+
on all the gm MAFs there is a limit to how much air you can read, once you max it out the the computer doesnt know how much air is in the engine so it doesnt really know how much fuel to give it.
now you can tune the VE table to compensate, but if the weather changes (baro) then your tune is messed up thanks to the 1 bar MAP sensor.
I believe anthoney is looking at doing megasquirt which should fix this problem
on all the gm MAFs there is a limit to how much air you can read, once you max it out the the computer doesnt know how much air is in the engine so it doesnt really know how much fuel to give it.
now you can tune the VE table to compensate, but if the weather changes (baro) then your tune is messed up thanks to the 1 bar MAP sensor.
I believe anthoney is looking at doing megasquirt which should fix this problem
So is the 98 a 1 bar or is it less then 1 bar and the 99+ is 1 bar? If the 99+ is more then 1 bar then how high is it. And what would i have to do to tune higher then the limitations of a 1 bar system. IE woudl just getting a different MAF do it or is it a whole mess of **** id have to get. Thanks
PS sorry for hi-jacking
John
PS sorry for hi-jacking
John
all ls1 come with one bar map sensor that read pressure from vacuum (-14.7psi) to 0psi
which is realy ony good for NA engines.
you can get an aftermarket computer that allows a speed density tune, which utalizes a 2 or 3 or even 4 bar map sensor, those will montoir the boost level and adjust the fueling.
you cant just get a different MAF as the computer is limited to the alowable frequence that the MAF registers.
for 98 cars the only real option for tunning if you go over the 550rwhp mark is to do an aftermarket controller
also may not that superchargers will require more air per rwhp then turbos, since the supercharger eats up HP, on reason turbo cars dont max out the MAF as soon.
which is realy ony good for NA engines.
you can get an aftermarket computer that allows a speed density tune, which utalizes a 2 or 3 or even 4 bar map sensor, those will montoir the boost level and adjust the fueling.
you cant just get a different MAF as the computer is limited to the alowable frequence that the MAF registers.
for 98 cars the only real option for tunning if you go over the 550rwhp mark is to do an aftermarket controller
also may not that superchargers will require more air per rwhp then turbos, since the supercharger eats up HP, on reason turbo cars dont max out the MAF as soon.
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Thread Starter
10 Second Club
iTrader: (80)
Joined: Sep 2002
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From: Reynoldsburg, Ohio
Jonathan hit it on the head, my '98 PCM is limited with the MAF capabilities as compared to the '99+ PCMs. I've discussed with him in person the possibility of running a Megasquirt, which I'm leaning towards right now.
ON EDGE WS6: Thanks. Another reason I traded a M6 (94Z) for the A4
ON EDGE WS6: Thanks. Another reason I traded a M6 (94Z) for the A4
So what is teh PSI limit for a 98 and for a 99+ with stock maf adn PCM? My brother has a DSM that he has a GM MAF on adn uses one of those translators to make it work. The guys that use them on the dsm's make liek 20+psi why are we limited so low? Is it cause we use alot more CFM to make the same PSI? Also waht is a mega squirt?
John
John
Originally Posted by smokinHawk
think you were the fastest vehicle there that drove to the track and back that day
you beat me out by .04 seconds with my 10.99@125
but i maintained 50mpg
you beat me out by .04 seconds with my 10.99@125
but i maintained 50mpg
ya thanks for smiling about my acciddent todd
(for those that dont know a civic changed lanes into me and nocked me off my bike last friday)
the MAF maxes out in air flow not psi, since our engines are bigger it equates to less psi then a smaller engine can take.
i believe the 99 MAFs can measure 60lbs/min or air, i think the 98s can measure 58lbs/min but not 100% sure
(for those that dont know a civic changed lanes into me and nocked me off my bike last friday)
the MAF maxes out in air flow not psi, since our engines are bigger it equates to less psi then a smaller engine can take.
i believe the 99 MAFs can measure 60lbs/min or air, i think the 98s can measure 58lbs/min but not 100% sure