MAF sensors...why won't other stock applications work??
04-23-2004, 06:14 PM
#17
Three Wheelin'
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I e-mailed Split Second about a possible purchase, letting them know that I had access to an S-AFC unit and I inquired about buying everything *except* the ARC2-A. Here was the response I got...
"Sean,
I would not recommend the SAFC. It is not going to give you the correct
elevation compensation, signal filtering or tunability vs. load."
Do you guys think there's any truth to this, or are they just trying to get me to spring the $500 to buy their ARC2?
"Sean,
I would not recommend the SAFC. It is not going to give you the correct
elevation compensation, signal filtering or tunability vs. load."
Do you guys think there's any truth to this, or are they just trying to get me to spring the $500 to buy their ARC2?
04-24-2004, 05:26 AM
#18
Race Director
No, use the S-AFC... The ARC2 is really a resistor-array that does volt-in -> volt-out massaging. It has no idea of RPM or load which is what you want for 3D fuel-mapping. The S-AFC is more precise in its adjustments so you'll have an easier time dialing in your optimum air-fuel ratios.
04-24-2004, 02:38 PM
#20
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Anyone use the Lindsey stage 1? How hard to install? What gains expected? Anyone using this and give some feedback? I've been looking for a kit that can easily switch back to stock form for the Smog Test in Ca.
04-24-2004, 02:42 PM
#21
Three Wheelin'
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Ask Lindsey if the kit has a CARB EO #. If not, you'll have to scrap it before you smog. Ideally, wait til your smog is due, then install mods after you get home. Then you have 2 years to worry about it. 
It really looks like it can be done for far less than they charge. If this combination of parts I'm thinking about will work, it will run me a total of about $450!
Another Rennlister (David F) is helping me out via e-mail right now. I'll leave a post once I know for sure in case anyone is interested in an affordable MAF conversion.
It really looks like it can be done for far less than they charge. If this combination of parts I'm thinking about will work, it will run me a total of about $450!
Another Rennlister (David F) is helping me out via e-mail right now. I'll leave a post once I know for sure in case anyone is interested in an affordable MAF conversion.
04-24-2004, 04:18 PM
#23
Burning Brakes
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So the SAFC does work? Everyone was telling me that it wouldn't
....
http://www.pro-flow.com/Import/import%20front.htm
If you look under "Buy Online", the kits are around $700. I called them a couple years ago, and they did have it for the 944 as they make and supply it for Lindsey Racing, and just about everyone else now.
....http://www.pro-flow.com/Import/import%20front.htm
If you look under "Buy Online", the kits are around $700. I called them a couple years ago, and they did have it for the 944 as they make and supply it for Lindsey Racing, and just about everyone else now.
04-24-2004, 05:14 PM
#24
Race Director
Originally posted by Bryan
A stock "flapper door" air flow meter sends two signals back to the ECU. The angle of the flapper door, and the temp of the incoming air. The ECU uses these two values to compute the mass or the incoming air.
An air mass meter sends one signal - the mass of the incoming air. So the ECU doesn't perform an air mass calculation.
To put a MAF in a car where the ECU is expecting the two signals from the flapper door air flow meter is therefore somewhat complicated. The easiest way would be to always present a constant temp signal via a fixed resistor, then alter the MAF output to match the range the ECU is expecting from the flapper door potentiometer. In theory, since the MAF automatically compensates for air temp, this would work. But it would take a while to get working and debug. And not having to hassle with it is worth $1000 to enough people to make it a viable business proposition.
Bryan
A stock "flapper door" air flow meter sends two signals back to the ECU. The angle of the flapper door, and the temp of the incoming air. The ECU uses these two values to compute the mass or the incoming air.
An air mass meter sends one signal - the mass of the incoming air. So the ECU doesn't perform an air mass calculation.
To put a MAF in a car where the ECU is expecting the two signals from the flapper door air flow meter is therefore somewhat complicated. The easiest way would be to always present a constant temp signal via a fixed resistor, then alter the MAF output to match the range the ECU is expecting from the flapper door potentiometer. In theory, since the MAF automatically compensates for air temp, this would work. But it would take a while to get working and debug. And not having to hassle with it is worth $1000 to enough people to make it a viable business proposition.
Bryan
04-24-2004, 05:38 PM
#25
Race Director
Sean, a MAF is definitely a superior solution. And as others have said, the key is engine management. Figure that out and you can do it cheaper than paying someone who has already figured it out
