How to set the MAF kit for adjusting base idle? HUNTLEY or SFR or AMW help
01-16-2003, 05:54 PM
#16
Banned
</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">I know my base idle is wrong, the bypass screw is screwed in almost all the way in and im at 1050 rpm's, i cant get the idle revs any lower </font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">I have 52 lb injectors and a maf on my car. when i screwed the bypass screw in all the way the engine would stall out. this tells me that you have a intake or vaccume leak. To get a 1050 rpm with just feul is not possible. further more you stated that your turbos spoolup is slow. That is another indication of a vacume leak. Good luck. Just trying to help.
01-16-2003, 07:01 PM
#17
Race Director
</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by DanD:
<strong>Here is a spreadsheet with the data from my last dyno run:
<img src="http://www.gururacing.net/ImagesMisc/DanD-DynoAirFuel.gif" alt=" - " />
...
I guess what I'm asking is what do I do to flatten out the A/F ratio. </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">You can try adjusting the ARC2, but the contradictory adjustments (richen low-end & lean out mid-range & richen high-end) is really difficult. Here's the real problem, the underlying chips:
<img src="http://www.gururacing.net/ImagesMisc/AutoThorityWOTfuelCompare.gif" alt=" - " />
Noticed that the Porsche TurboCup car with 290bhp uses the same WOT fuel-map as the '86-87 951. Also from the comparisons at <a href="http://www.novustelecom.net/~fkassam/dyno/dyno.html" target="_blank">Farzaan's Dyno Day</a>, the TurboCup chips gave one of the best results with a wide powerband, not lazy in the low-end with a quick peak and a quick drop-off like the APE chips.
Another interesting thing is that the 24-pin & 28-pin APE Stg.2 chips have completely different fuel maps! Also note that the APE chips dump in twice as much fuel as stock in the mid-range. Sure, if you're going from the stock 12psi boost to 24psi, then that fuel may be appropriate. But at the 15-18psi that most people use, that's just way, way too much fuel.
Dumping in that much fuel also brings on an earlier onset of the 100% duty-cycle limit on the injectors. If your injectors are at 50% duty-cycle @5000rpm under WOT with the stock chips, putting in the APE chips will double that right up to 100%. From that point onwards, you'll get a air-fuel curve that gets leaner and leaner due to the fixed fuel flow, yet air-flow is still increasing.
DanD, you've got our latest GURU version-8b chip coming to update your version-4a one. This one should give you a fairly flat air-fuel curve with your ARC2 set to all zeros across the board. Then you just need to make one-click adjustments here & there on the ARC2 to fine-tune the curve for your particular configuration.
<strong>Here is a spreadsheet with the data from my last dyno run:
<img src="http://www.gururacing.net/ImagesMisc/DanD-DynoAirFuel.gif" alt=" - " />
...
I guess what I'm asking is what do I do to flatten out the A/F ratio. </strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">You can try adjusting the ARC2, but the contradictory adjustments (richen low-end & lean out mid-range & richen high-end) is really difficult. Here's the real problem, the underlying chips:
<img src="http://www.gururacing.net/ImagesMisc/AutoThorityWOTfuelCompare.gif" alt=" - " />
Noticed that the Porsche TurboCup car with 290bhp uses the same WOT fuel-map as the '86-87 951. Also from the comparisons at <a href="http://www.novustelecom.net/~fkassam/dyno/dyno.html" target="_blank">Farzaan's Dyno Day</a>, the TurboCup chips gave one of the best results with a wide powerband, not lazy in the low-end with a quick peak and a quick drop-off like the APE chips.
Another interesting thing is that the 24-pin & 28-pin APE Stg.2 chips have completely different fuel maps! Also note that the APE chips dump in twice as much fuel as stock in the mid-range. Sure, if you're going from the stock 12psi boost to 24psi, then that fuel may be appropriate. But at the 15-18psi that most people use, that's just way, way too much fuel.
Dumping in that much fuel also brings on an earlier onset of the 100% duty-cycle limit on the injectors. If your injectors are at 50% duty-cycle @5000rpm under WOT with the stock chips, putting in the APE chips will double that right up to 100%. From that point onwards, you'll get a air-fuel curve that gets leaner and leaner due to the fixed fuel flow, yet air-flow is still increasing.
DanD, you've got our latest GURU version-8b chip coming to update your version-4a one. This one should give you a fairly flat air-fuel curve with your ARC2 set to all zeros across the board. Then you just need to make one-click adjustments here & there on the ARC2 to fine-tune the curve for your particular configuration.
01-16-2003, 10:15 PM
#18
Addict
Rennlist Member
Rennlist Member
"DanD, you've got our latest GURU version-8b chip coming to.. "
Danno, You floor me. <img border="0" title="" alt="[Eek!]" src="eek.gif" />
I'm speechless. Thanks aren't enough.
Dan
Who thinks anyone named Dan with 5000 posts should be called 'Hero'.
Danno, You floor me. <img border="0" title="" alt="[Eek!]" src="eek.gif" />
I'm speechless. Thanks aren't enough.
Dan
Who thinks anyone named Dan with 5000 posts should be called 'Hero'.
