Use Stock MAF with SC!
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Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Use Stock MAF with SC! I have three MAF's:
1. Stock with screen
2. Stock without screen and (basically) ported
3. Granetelli MAF
I've tried the Granetelli MAF and the Stock De-screened MAF AND the GMAF Ends with the stock MAF sensor. Conclusion: <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />
The screen in the MAF levels out the velocity of the air flowing thru the MAF at idle, thereby smoothing the surging at idle. It's probably not an issue with an N/A car, but the blower is pushing quite a stiff flow of air thru the MAF and throttle-body at idle. Everytime there was a slight surge (I guess from the load of the compressor), the surge was excacerbated by a pendulum-like effect of the MAF trying to chase the fluctuating air velocity at idle.
With the GMAF or stock de-screened MAF at idle, it would actually cut off at some dips in idle. The problem was barely noticeable with the screened MAF.
The GMAF is an added, unnecessary inconvenience with the FI. I remember Dave recommending the Twin Turbo guys go back to the stock screened MAF when a discussion of compatibility came up... I don't remember all his reasons.
In the quarter, for three out of three runs, the GMAF consistently netted me SLOWER E/T that the stock, screened MAF. Besides, I believe Superchips just compensates for the leaning out the GMAF introduces... that makes it a waste of money for a SC'd motor, to me.
The GMAF gave me about 1 to 2 tenths in the 8th mile (before the Supercharger), so it is a good unit... I'll just sell it to someone who is N/A, if they want it. I also have a Hypertech Programmer Plus sitting around with no one to love.
1. Stock with screen
2. Stock without screen and (basically) ported
3. Granetelli MAF
I've tried the Granetelli MAF and the Stock De-screened MAF AND the GMAF Ends with the stock MAF sensor. Conclusion: <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />
The screen in the MAF levels out the velocity of the air flowing thru the MAF at idle, thereby smoothing the surging at idle. It's probably not an issue with an N/A car, but the blower is pushing quite a stiff flow of air thru the MAF and throttle-body at idle. Everytime there was a slight surge (I guess from the load of the compressor), the surge was excacerbated by a pendulum-like effect of the MAF trying to chase the fluctuating air velocity at idle.
With the GMAF or stock de-screened MAF at idle, it would actually cut off at some dips in idle. The problem was barely noticeable with the screened MAF.
The GMAF is an added, unnecessary inconvenience with the FI. I remember Dave recommending the Twin Turbo guys go back to the stock screened MAF when a discussion of compatibility came up... I don't remember all his reasons.
In the quarter, for three out of three runs, the GMAF consistently netted me SLOWER E/T that the stock, screened MAF. Besides, I believe Superchips just compensates for the leaning out the GMAF introduces... that makes it a waste of money for a SC'd motor, to me.
The GMAF gave me about 1 to 2 tenths in the 8th mile (before the Supercharger), so it is a good unit... I'll just sell it to someone who is N/A, if they want it. I also have a Hypertech Programmer Plus sitting around with no one to love.
Launching!
Joined: Nov 2001
Posts: 215
Likes: 0
From: Marlboro, NY
Re: Use Stock MAF with SC! Would the Z06 maf with screen / calibrated for LS1 work? I think it would make it easier to relocate it upstream of the compressor and use the integrated IAT sensor. Just wondering.
