494whp on a 50 trim and HKS 272 vs Comp 100 comparo

[lowell]

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And for reference, a stock 4th gen Viper on our dyno:

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[caboose]

thats awesome!! niice work.! pics/vid?? have you tried it with E85?

 

[NOSLO2PT0]

Are you saying you picked up over 100whp just by swapping from Comp 100 cams to HKS 272's? Or the other way around?

 

[Yngvar]

Is run one with HKS and run two with comps? If so I would hope hks 272 would make more power then comp 100 you really needed to use comp 200 to really compare

 

[NOSLO2PT0]

I'm not buying that a set of cams made 100whp difference either. I'm guessing the boost went from about 18 to 30 as well.

 

[lowell]

The first graph shows peak gains of 20whp. Run #1 is HKS272, run #2 is Comp100. I'd love to test a set of Comp200's in this car and I agree that would be a better comparison. Boost pressure on both tests was optimized for best torque/power. 32.x psi at spool dropping to 30.x going from memory.

No E85 available here, all my cars run pump gas with methanol spray.

This car ran 134mph with about 450whp @ 2955lbs. 2010 should be interesting, and I'm looking for 140+mph in a daily driver pump gas street car.

 

[Yngvar]

I would really like to see dyno numbers between the HKS 272 vs. comp 200s because I can't decide between the two

 

[91-gsx]

Those are great numbers. Great job. I am not sure if I am seeing or reading the dyno right.. Did you make 474HP/413TQ with the Comp 100's and then 494HP/300TQ with the HKS 272's? Was the drop in torque worth the gain in horsepower in your opinion? How does the car feel after the swap?

 

[caboose]

Those are great numbers. Great job. I am not sure if I am seeing or reading the dyno right.. Did you make 474HP/413TQ with the Comp 100's and then 494HP/300TQ with the HKS 272's? Was the drop in torque worth the gain in horsepower in your opinion? How does the car feel after the swap?

its looks like 388 to me....?

 

[91-gsx]

its looks like 388 to me....?

That would make much more sense. Thanks for clearing that up.

So giving up about 25TQ for all the extra top end that the car made after the swap, that sounds like a very worthwhile gain. Very nice setup.

 

[92GSXtacy]

It's NOT 388 to 494. It's 474whp to 494hp. The TORQUE is 388 on the first run then goes to 413 on the second. So:

Run 1:
494hp/388tq

Run 2:
474hp/413tq

So the HKS's gained HP but lost TQ, makes sense, larger cam=shift to the right.

 

[bullettdsm]

So the HKS's gained HP but lost TQ, makes sense, larger cam=shift to the right.

Agreed. Nice peak numbers for a 50 trim, but I would venture to say from the graph that the first run (the comp 100's) would be a better match for the 50 trim than the second run. Looking at power under the curve and peak torque, I would want to shift her right around 7k range (depending on gear) and then she would fall back into the peak torque area with power coming in strong.

Interesting comaprison though. Thanks OP. I always like to see these things.

MB

 

[lowell]

Agreed. Nice peak numbers for a 50 trim, but I would venture to say from the graph that the first run (the comp 100's) would be a better match for the 50 trim than the second run. Looking at power under the curve and peak torque, I would want to shift her right around 7k range (depending on gear) and then she would fall back into the peak torque area with power coming in strong.

Interesting comaprison though. Thanks OP. I always like to see these things.

MB

I wish I could have the best of both cams. VTEC switchover at 6500rpm...

Another thought was switch to a billet compressor wheel that can make a little more mid range boost which should bring the torque back to the 410-420 range where it will haze the tires on a second gear roll on

PTE Billet Turbochargers.. IN STOCK! Journal and Ball Bearing! - evolutionm.net

Does anyone know what the horsepower record on a 50 trim is? Any higher than this? http://forum.miata.net/vb/showthread.php?t=258833

 

[TURBD]

Almost 600hp in a Miata..that would be nuts.
I have no idea what the max HP is on a 50 trim, but thats got to be getting close.