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SVTPerformance's Chain of Restaurants
The Blower Bistro
Zex 125 dry shot dyno
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<blockquote data-quote="98 Yeller' SVT" data-source="post: 2485525" data-attributes="member: 7862"><p>The A/F ratio does this: It's between 11 and 12 from 2500 to around 3500 when the window switch kicks in the N20, then it richens up to about 10:1 till around 5000 and swings back leaner to about 12:1 at 5500-6000RPMs, then richens up again into the 10's just before redline. The line is all wavy, It's steady, then richens, then leans, then richens to redline.</p><p></p><p>The A/F ratio was as funky as the dyno lines. The SCT tuner that tuned it tried to straighten out the A/F ratio but he said that he believes the Zex management box (that controls f/p through the FPR) wouldn't allow him to adjust the A/F ratio that much. He believes that the Zex system is designed to run the car rich and that it's out of the tuners hands. That's why we made so many pulls, he kept tweaking trying to get it right. In addition, I installed a boost a pump to help the stock 150 lph along, and he said that was also making it more difficult to tweak the A/F.</p><p></p><p>He said "It's rich, but it's safe". To be honest I'm happy with the dyno numbers... I don't want any more power, I just want to be safe, the A/F is crazy... but he said it's safe...</p></blockquote><p></p>
[QUOTE="98 Yeller' SVT, post: 2485525, member: 7862"] The A/F ratio does this: It's between 11 and 12 from 2500 to around 3500 when the window switch kicks in the N20, then it richens up to about 10:1 till around 5000 and swings back leaner to about 12:1 at 5500-6000RPMs, then richens up again into the 10's just before redline. The line is all wavy, It's steady, then richens, then leans, then richens to redline. The A/F ratio was as funky as the dyno lines. The SCT tuner that tuned it tried to straighten out the A/F ratio but he said that he believes the Zex management box (that controls f/p through the FPR) wouldn't allow him to adjust the A/F ratio that much. He believes that the Zex system is designed to run the car rich and that it's out of the tuners hands. That's why we made so many pulls, he kept tweaking trying to get it right. In addition, I installed a boost a pump to help the stock 150 lph along, and he said that was also making it more difficult to tweak the A/F. He said "It's rich, but it's safe". To be honest I'm happy with the dyno numbers... I don't want any more power, I just want to be safe, the A/F is crazy... but he said it's safe... [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
Zex 125 dry shot dyno
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