too much for MAF sensor?
08-20-2003, 04:18 AM
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Car: '86 IROC-Z/'94 Z28
Engine: 350 LT1/382 LT1
Transmission: 4L60-E/T-56
Axle/Gears: 3.45/3.42 (soon 4.10)
too much for MAF sensor?
I was recently told that my engine combination was too radical for the use of my factory MAF system when asking around about prom reprogramming. Is there ary standard way to tell if it is or not, HP or otherwise? Here are my current engine specs...
HT383, 10.75:1 CR
Pro topline 200 aluminum heads, 64cc, ~ 278 /200 cfm
Comp cams cc306, 230/244 dur. @ .050", .510"/.540", 112 LSA
modified LT1 intake w/58mm TB, 24# SVO's
longtube headers w/borla carback
The reason I worry so much is I dont want the maf sensor maxing out and creating a lean condition. I just picked up a blower so I want to make some changes to use it. Changes like...
HT383
upgrade to custom forged pistons and rods, 9.5:1 CR
sn-89 paxton at 6 psi, or 12psi with intercooler(if I can find one)
custom comp cam, similar to cc306 with 114 LSA
upgrade to 30# injectors
I'd hate to see this max out because I have a 434 I might use in the future with this stuff...hate to blow it all up...
HT383, 10.75:1 CR
Pro topline 200 aluminum heads, 64cc, ~ 278 /200 cfm
Comp cams cc306, 230/244 dur. @ .050", .510"/.540", 112 LSA
modified LT1 intake w/58mm TB, 24# SVO's
longtube headers w/borla carback
The reason I worry so much is I dont want the maf sensor maxing out and creating a lean condition. I just picked up a blower so I want to make some changes to use it. Changes like...
HT383
upgrade to custom forged pistons and rods, 9.5:1 CR
sn-89 paxton at 6 psi, or 12psi with intercooler(if I can find one)
custom comp cam, similar to cc306 with 114 LSA
upgrade to 30# injectors
I'd hate to see this max out because I have a 434 I might use in the future with this stuff...hate to blow it all up...
08-20-2003, 10:39 AM
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Car: 1992 B4C 1LE
Engine: Proaction 412, Accel singleplane
Transmission: built 700R4 w/custom converter
Axle/Gears: stock w/later 4th gen torsen pos
the problem is the factory MAF is too restrictive and can limit a motor's air intake to that only it supports 400-450 hp.
It wont blow you up il will just restrictor pate you.
consider searching this site for info on the MAF to "730" or SD (speed density) conversion and learning about burning a chip.
otherwise a aftermarket ECM is in order as no MAF fixes exist to make it larger.
It wont blow you up il will just restrictor pate you.
consider searching this site for info on the MAF to "730" or SD (speed density) conversion and learning about burning a chip.
otherwise a aftermarket ECM is in order as no MAF fixes exist to make it larger.
08-24-2003, 07:25 PM
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I agree that the MAF is a restriction, but Ski has already proven you can run 11.1 @ 123 mph naturally through a stock ported MAF. He makes 426 hp at the wheels and 500+lbs of torque also at the wheels.
But vettes also have a straight intake tract with a ram effect that is only 15 inches or so longs which helps alot.
But vettes also have a straight intake tract with a ram effect that is only 15 inches or so longs which helps alot.
08-25-2003, 01:35 AM
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Car: 1992 B4C 1LE
Engine: Proaction 412, Accel singleplane
Transmission: built 700R4 w/custom converter
Axle/Gears: stock w/later 4th gen torsen pos
sounds like what I have heard. Im wondering how fast he would be without it...
08-25-2003, 05:14 AM
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Im wondering how fast he would be without it...
But I am just letting dhirocz know that he has options and does not need to switch.
You will probably max it out but there are ways to work around that as well.
08-25-2003, 05:58 AM
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Car: '86 IROC-Z/'94 Z28
Engine: 350 LT1/382 LT1
Transmission: 4L60-E/T-56
Axle/Gears: 3.45/3.42 (soon 4.10)
The reason I was wondering is because the 383 I have now is just a 'temporary' motor until I get the bad boy in there...replace everything, 434 stroker, 18* 230cc heads, blower cam and blower...the small paxton and forged 383 I haven't even gotten running yet is something I can use so I can take my time with the 434...I'd hate for it to max out the MAF sensor and just loose all my tuneability, and since you can buy used DFI setup for a couple hundred dollars more, was wondering if it was worth my while as I know little about prom tuning...
08-25-2003, 06:39 AM
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If you know little about prom burning what make you think you will be better off with a DFI?
Well probably your best option would be to use a cly/typ ECM
with a 2 bar map.
Or get the DFI.
Well probably your best option would be to use a cly/typ ECM
with a 2 bar map.
Or get the DFI.
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08-27-2003, 04:48 AM
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Car: '86 IROC-Z/'94 Z28
Engine: 350 LT1/382 LT1
Transmission: 4L60-E/T-56
Axle/Gears: 3.45/3.42 (soon 4.10)
well...
Well I do know that a good computer program for a TPI car can easily cost over $300 and that does not include the ability to make changes to the calibration. From what I've seen, for $400-$500 you can pick up a good used Accel Gen VI DFI setup which inlcudes the ability to make changes to your calibration. Sorry I should have been more specific. When it comes to making minor changes to things like injector size or engine size, I'm sure that isn't too big of a problem with dfi, but changing fuel and spark is something I have an idea about, but no real experience in. Fortunatley all you have to do is get close enough that the computer can learn the rest, from my understanding.
08-27-2003, 10:47 PM
#9
Re: too much for MAF sensor?
maf with a sc-yes it's doable-however.....
I'm currently running maf with a paxton sc on a 406 vette. Before the sc I was able to tune it to where all part throttle was crisp. Tuning wot with a wide band-no problems. Yes maf maxed, but then it's in pe and just use the wideband numbers at that point.
With the paxton....used an fmu-wot f/a 12.5 no problems (I have to stay with factory ecm for smog functions)
But! Now the maf in hot weather, and next to the sc is apperntly overheating-and I'm tired of replacing it! Also with the sc at several part throttle conditions the maf seems to get "confused"; only breifly, but it's irratating. So the 730 swap is about to happen...of course after I replace the shot tranny with a probuilt!
Oh well, it's always somthin' breakin! Rather be wrenchin on my car than the house......
I'm currently running maf with a paxton sc on a 406 vette. Before the sc I was able to tune it to where all part throttle was crisp. Tuning wot with a wide band-no problems. Yes maf maxed, but then it's in pe and just use the wideband numbers at that point.
With the paxton....used an fmu-wot f/a 12.5 no problems (I have to stay with factory ecm for smog functions)
But! Now the maf in hot weather, and next to the sc is apperntly overheating-and I'm tired of replacing it! Also with the sc at several part throttle conditions the maf seems to get "confused"; only breifly, but it's irratating. So the 730 swap is about to happen...of course after I replace the shot tranny with a probuilt!
Oh well, it's always somthin' breakin! Rather be wrenchin on my car than the house......
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