LMR works on Vipers too!
08-27-2009, 09:11 PM
#1
LMR works on Vipers too! I had the guys at Late Model Racecraft in Houston ( www.LateModelRacecraft.com ) do a dyno tune on my '06 Viper today.
Modifications:
Paxton supercharger with stock pulley and Split-Second (8.5 psi boost)
Custom 3" exhaust with high-flow cats (stock exhaust manifolds)
Computer tuning via SCT XCalibrator 2 tuner module and custom tuning software
Prior to tuning, the lower rpm was very lean and the throttle response was crappy. The engine did not rev smoothly in the midrange. This could also be felt when running the car hard. The custom tune added fuel in the lower rpm range, and added more timing at the higher rpm range. The result is now better drivability, smoother revving throughout the rpm range, and better throttle response at all rpm. It feels like a different car now, I'm pleased.
Video: http://www.youtube.com/watch?v=SSEz5eVoa-U
Next up, they will be pulling the engine out and building it to handle more boost. Plans call for forged pistons and rods, stock crank, and billet mains. I'd like to get 850-900 rwhp out of the Paxton. The engine will be built to handle 1200+ rwhp, just in case I decide to go twin turbos later on.
Tony
Modifications:
Paxton supercharger with stock pulley and Split-Second (8.5 psi boost)
Custom 3" exhaust with high-flow cats (stock exhaust manifolds)
Computer tuning via SCT XCalibrator 2 tuner module and custom tuning software
Prior to tuning, the lower rpm was very lean and the throttle response was crappy. The engine did not rev smoothly in the midrange. This could also be felt when running the car hard. The custom tune added fuel in the lower rpm range, and added more timing at the higher rpm range. The result is now better drivability, smoother revving throughout the rpm range, and better throttle response at all rpm. It feels like a different car now, I'm pleased.
Video: http://www.youtube.com/watch?v=SSEz5eVoa-U
Next up, they will be pulling the engine out and building it to handle more boost. Plans call for forged pistons and rods, stock crank, and billet mains. I'd like to get 850-900 rwhp out of the Paxton. The engine will be built to handle 1200+ rwhp, just in case I decide to go twin turbos later on.
Tony
Sick Car!!
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08-28-2009, 07:59 AM
#8
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Did you remove the split second box? The 2006 Viper we did with a Paxton made 682 RWHP but we didnt have cats. I could tell on our dyno that the split second box was pulling way too much timing up top. Also you might want to look into the DLM tensioner it works much better than the stock Paxton tensioner. If you havent yet ditch the paxton heat exchanger pump and replace it with a 03-04 cobra pump. Just a FYI.
Nice job on the tune Joe!
Nice job on the tune Joe!
Last edited by Mike TexaSS; 08-28-2009 at 08:13 AM.
08-28-2009, 08:47 AM
#9
Still has the split second for now. Joe tuned around it with the SCT stuff. We'll remove the split second after the engine gets built. Stock tensioner is okay at this boost level, but yes it will need an upgrade when we turn it up. DC sells a larger heat exchanger and pump combo, is this similar to the Cobra pump? http://www.dcperformance.com/Products/114.html
08-28-2009, 08:56 AM
#10
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Herbie is hungry! 
Good numbers Tony! I wish I would have gotten a Viper sometimes. It would be sitting pretty with some big turbos on it right now
I wouldn't have been shooting for 700rwhp on pump I'd be shooting for 1000rwhp on pump... DAMNIT!
Good numbers Tony! I wish I would have gotten a Viper sometimes. It would be sitting pretty with some big turbos on it right now
I wouldn't have been shooting for 700rwhp on pump I'd be shooting for 1000rwhp on pump... DAMNIT! 
08-28-2009, 07:15 PM
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Still has the split second for now. Joe tuned around it with the SCT stuff. We'll remove the split second after the engine gets built. Stock tensioner is okay at this boost level, but yes it will need an upgrade when we turn it up. DC sells a larger heat exchanger and pump combo, is this similar to the Cobra pump? http://www.dcperformance.com/Products/114.html
The DC heat exchanger is a really nice piece and that pump looks much larger than the cobra pump.
08-29-2009, 09:27 AM
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something like the DC kit is a must have for any paxton car... I had designed one I was going to install myself, was going to cost about the same, but I was also going to include a much larger water tank in the trunk.
