Going from a Vig3200 to a Yank SS4000 a loss of Power on Dyno?
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09-17-2004, 11:55 PM
#6
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Originally Posted by Pro Mouse
No other changes other than the verter,yes both numbers are corrected.my tuner said it was the bigger converter?
09-18-2004, 06:58 AM
#7
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Exactly. There could be some weight differences in the converters, but the difference would be 1-2hp I think due to that, assuming that is even in the right direction. Now maybe the lockup in the yank isn't working right. You should log RPM and speed, use a gear calculator and measure if there is any slip when locked.... should be less than 1%.
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09-18-2004, 09:35 AM
#8
A few questions. Did you disconnect the battery after the converter swap? If you did, how many miles did you have on the car before you dynoed the new converter? Cars with ported MAFs, non-stock injectors, or other tuning changes often need 50 miles or more before their long term fuel trims stabilize the air/fuel ratio. You could be running way lean on the dyno. Put some miles on your combo and re-dyno. If it's still low, look for other problems. It's not the converter.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
09-19-2004, 10:10 AM
#9
I dont have stock injectors,or stock MAF,The verter install with bat disconnected was a couple of months ago.But I did reflash my pcm before I went to the dyno and put about 15miles on it on the way there.I want my tuner to save my work with HP Tuner for starting issues only and Have him work from there.I cant see any loss of power with the verter locked.I am @ 12.9 to 13.0 A/F on the dyno @ wot.But what you are saying is that maybe wrong?
Thanks...Scott
Thanks...Scott
09-19-2004, 04:33 PM
#11
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Sorry to go off track but Pro Mouse I was wondering where you get your dyno tuning done in MI?? And about the verter it is hard to believe that you would lose that much hp from one aftermarket verter to another......stock to aftermarket 20hp loss is normal
09-20-2004, 05:32 AM
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Alright... locked vs. locked, then there is something wrong with the lockup or the motor just ran different after the converter. Again, if I were you, I'd log rpm/gear/speed and compare to a gear calculator, with the converter locked. If you don't see 99+%, you've got a bad lockup clutch.
