[FoundNemo]

As noted in the description, before and after dynos for my buddy's car:

• Vengeance Racing tuned on 93
• Stock air intake
• Stock throttle body
• Stock blower and pulley
• Weapon X Billet Lid
• CSP 2" Ceramic Coated Longtubes w/GESI Gen 2 UHO Cats
• OEM X-Crossover
• 3" Crimp Delete
• Corsa Sport 2.75" Axleback

Boost drops about 0.5psi over stock but making more power and less heat generation. This is a 10spd in 7th gear.

[avalonandl]

Ummmm....20 HP ?

And the torque number change looks good but HP number at same rpm ....

[Z OH 6]

Got to admit, not overly impressed honestly. Headers, high flow cats and tune I would have expected a bit more I suppose. It seems like Camaro1973 was down on a power just a bit too after installing the CSP headers and GESI Gen 2 UHO cats compared to his previous Kooks headers if I recall. I think he believed it was the weather that caused the drop in power but now I'm starting to question if the CSP headers just aren't quite as good as the Kooks. This is of course assuming the weather is similar. I know we're in the middle of the summer also so I wouldn't expect peak numbers to be as high, I know mine dyno'd 599whp at Vengeance stock with just a Rotofab intake and AWE catback exhaust but mine ran into the fuel limit wall at 700whp with mods so I don't think I actually got as much out of my mods as some others would.

[FoundNemo]

Originally Posted by avalonandl

Ummmm....20 HP ?

And the torque number change looks good but HP number at same rpm ....

Boost is down from the flow from the headers. Wheels are also downsized to 19's and the tires are 275/30R19 front and 295/30R19 rear. The tire height is over an inch smaller than stock front and rear which affects the read out for power numbers (reduces them notably) when you compare to a stock car's output (different effective gear ratios). The point of the dyno is to show before/after for the mods, not to cross compare other dynos on other cars. Basics...

[Z OH 6]

Originally Posted by FoundNemo

Boost is down from the flow from the headers. Wheels are also downsized to 19's and the tires are 275/30R19 front and 295/30R19 rear. The tire height is over an inch smaller than stock front and rear which affects the read out for power numbers (reduces them notably) when you compare to a stock car's output.

So, the wheels were also changed from the baseline?

[CW3SF]

Throw a JMS booster and a flex fuel kit on that puppy and watch it really come alive.

[FoundNemo]

Originally Posted by Z OH 6

So, the wheels were also changed from the baseline?

Nope, baseline for a ZL1 A10 on a dynojet in 7th is around 550-560whp and 560-570wtq SAE. Have multiple dynos to show that on another Dynojet.

[Z OH 6]

Originally Posted by FoundNemo

Nope, baseline for a ZL1 A10 on a dynojet in 7th is around 550-560whp and 560-570wtq SAE. Have multiple dynos to show that on another Dynojet.

You lost me then, it seems like you were saying the car didn't dyno that well because of the smaller wheels and tires. If he had the same wheels and tires on the car from the baseline, and then added headers, high flow cats, and tune, it was a 20hp gain which isn't all that impressive. All that being said, I've always read that wheel/tire size won't make any difference on a dyno, although the amount of tire friction can affect the numbers, such as using a street tire vs a drag radial.

[FoundNemo]

Originally Posted by Z OH 6

You lost me then, it seems like you were saying the car didn't dyno that well because of the smaller wheels and tires. If he had the same wheels and tires on the car from the baseline, and then added headers, high flow cats, and tune, it was a 20hp gain which isn't all that impressive. All that being said, I've always read that wheel/tire size won't make any difference on a dyno, although the amount of tire friction can affect the numbers, such as using a street tire vs a drag radial.

Not worried about impressions. Its prep for a 2650. Just sharing data.

[Z OH 6]

Originally Posted by FoundNemo

Not worried about impressions. Its prep for a 2650. Just sharing data.

Thanks for sharing. Might help some decide between CSP, ARH or Kooks headers.

[Can'tHave2MuchHP]

Peak gain of 20 HP and probably almost all of it is in the tune.

Header differences between the brands will be so marginal in HP numbers that it really won't be worth using as a comparison IMO.

[FoundNemo]

Originally Posted by Z OH 6

Thanks for sharing. Might help some decide between CSP, ARH or Kooks headers.

Cheers

[FoundNemo]

Originally Posted by Can'tHave2MuchHP

Peak gain of 20 HP and probably almost all of it is in the tune.

Header differences between the brands will be so marginal in HP numbers that it really won't be worth using as a comparison IMO.

Yep but 35-45wtq gains under the curve which is substantial. Lowest gain is at peak. Should be fun with a Maggie on her.

[FoundNemo]

Originally Posted by Z OH 6

You lost me then, it seems like you were saying the car didn't dyno that well because of the smaller wheels and tires. If he had the same wheels and tires on the car from the baseline, and then added headers, high flow cats, and tune, it was a 20hp gain which isn't all that impressive. All that being said, I've always read that wheel/tire size won't make any difference on a dyno, although the amount of tire friction can affect the numbers, such as using a street tire vs a drag radial.

Note, the wheels/tires were on the first "stock" run too so those numbers are also lower than actual. The delta gains for headers/tune at 35-40rwtq down low, reducing to 20ish at peak, are accurate. All the numbers are reading low though due to tire height was my point. The numbers were not expected by VR to be higher due to lowered boost, so you're gaining pumping efficiency and reducing exhaust restriction which lowers boost but still makes power net. Realistically, the headers are worth 20-25ish more than on the graph here with the tune if you added the equivalent boost back in to match stock boost, but without a pulley swap to do that mechanically, you only net a portion of what they are worth due to the reduced boost which makes perfect sense.