A 100% True "Cam Only" Before & After (Dyno Sheet)
Thread Starter
Staging Lane
Joined: Dec 2015
Posts: 94
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A 100% True "Cam Only" Before & After (Dyno Sheet) 
100% Stock 11 Corvette GS m6. 105k miles before and after. Dual mode exhaust. This is using BTR Stage 3 Cam Kit.
383 Before to 408 After.
That being said, any experience with the cheaper American made long tubes such as Hinson or jba or dynatech? Or spend an extra $500 for hooker or kooks?
Last edited by CowsGoMooo; Sep 27, 2017 at 07:02 PM.
I really expected more ou of that car even with just a cam. Why did you cam the car with such a large cam and not do anything else? There's nothing wrong with any of those headers all of them will fit ok.
however ls3 engines benefit even bone stock from a 2" header. I would look into ARH 2" or stainless works tubes if you want the best power from that motor. Also lol into a CAI if you don't have one already. Halltech of vararam are some popular favorites
however ls3 engines benefit even bone stock from a 2" header. I would look into ARH 2" or stainless works tubes if you want the best power from that motor. Also lol into a CAI if you don't have one already. Halltech of vararam are some popular favorites
I'm guessing even a decent 1-7/8" long tube is gonna hit this combo with another 50 RWHP and at least 35-40 more on the torque side......
Thread Starter
Staging Lane
Joined: Dec 2015
Posts: 94
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Yeah looks like it didn't make any more torque until 4000 rpms indicating quite a loss in cylinder pressure until the piston speed gets elevated and she starts moving some air to recover......problem is those manifolds are already becoming a choke point on the exit side by then
I'm guessing even a decent 1-7/8" long tube is gonna hit this combo with another 50 RWHP and at least 35-40 more on the torque side......
I'm guessing even a decent 1-7/8" long tube is gonna hit this combo with another 50 RWHP and at least 35-40 more on the torque side......
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Thread Starter
Staging Lane
Joined: Dec 2015
Posts: 94
Likes: 0
Yeah looks like it didn't make any more torque until 4000 rpms indicating quite a loss in cylinder pressure until the piston speed gets elevated and she starts moving some air to recover......problem is those manifolds are already becoming a choke point on the exit side by then
I'm guessing even a decent 1-7/8" long tube is gonna hit this combo with another 50 RWHP and at least 35-40 more on the torque side......
I'm guessing even a decent 1-7/8" long tube is gonna hit this combo with another 50 RWHP and at least 35-40 more on the torque side......
The long tubes on the headers prevent the exhaust of one cylinder from "polluting" the intake charge of the next cylinder. They also create a low pressure "depression" in the cylinder after the exhaust stroke to help get better cylinder fill. You're relying on the energy and momentum of the exhaust gases to assist with cylinder fill, so you want to do nothing to slow them down.
In a turbo, you're extracting the energy from the gases to do work spinning the turbine. So, the flow after the turbo is far less important when comparing to NA.
Thread Starter
Staging Lane
Joined: Dec 2015
Posts: 94
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Different world -- A turbo cam and a turbo manifold are completely different from a NA engine with a larger cam. You need the long tube headers to help that big cam breathe. You'll get more benefit out of headers than the mid pipe. You'll gt more benefit from a mid pipe than a cat back.
The long tubes on the headers prevent the exhaust of one cylinder from "polluting" the intake charge of the next cylinder. They also create a low pressure "depression" in the cylinder after the exhaust stroke to help get better cylinder fill. You're relying on the energy and momentum of the exhaust gases to assist with cylinder fill, so you want to do nothing to slow them down.
In a turbo, you're extracting the energy from the gases to do work spinning the turbine. So, the flow after the turbo is far less important when comparing to NA.
The long tubes on the headers prevent the exhaust of one cylinder from "polluting" the intake charge of the next cylinder. They also create a low pressure "depression" in the cylinder after the exhaust stroke to help get better cylinder fill. You're relying on the energy and momentum of the exhaust gases to assist with cylinder fill, so you want to do nothing to slow them down.
In a turbo, you're extracting the energy from the gases to do work spinning the turbine. So, the flow after the turbo is far less important when comparing to NA.
A good set of 1 7/8" long tube headers and 3" exhaust out the back and you should be in the neighborhood of 460 - 470hp.
KW
If you chase numbers you wont be happy.
An NA supra couldnt do 600rwhp. Turbo helps that obviously but you've gotta build quite a bit of rpm just to have fun in em.
The truth is every car is different. You dont need to go to a 3 inch intermediate section, but going there will gain you some. Doing that youll need a 3 inch catback also unless you reduce it after also. There are only a few companies that offer exhaust that work with the npp exhaust also and they are all pricey. Its the corvette tax basically.
Its a balance.
An NA supra couldnt do 600rwhp. Turbo helps that obviously but you've gotta build quite a bit of rpm just to have fun in em.
The truth is every car is different. You dont need to go to a 3 inch intermediate section, but going there will gain you some. Doing that youll need a 3 inch catback also unless you reduce it after also. There are only a few companies that offer exhaust that work with the npp exhaust also and they are all pricey. Its the corvette tax basically.
Its a balance.
Thread Starter
Staging Lane
Joined: Dec 2015
Posts: 94
Likes: 0
If you chase numbers you wont be happy.
An NA supra couldnt do 600rwhp. Turbo helps that obviously but you've gotta build quite a bit of rpm just to have fun in em.
The truth is every car is different. You dont need to go to a 3 inch intermediate section, but going there will gain you some. Doing that youll need a 3 inch catback also unless you reduce it after also. There are only a few companies that offer exhaust that work with the npp exhaust also and they are all pricey. Its the corvette tax basically.
Its a balance.
An NA supra couldnt do 600rwhp. Turbo helps that obviously but you've gotta build quite a bit of rpm just to have fun in em.
The truth is every car is different. You dont need to go to a 3 inch intermediate section, but going there will gain you some. Doing that youll need a 3 inch catback also unless you reduce it after also. There are only a few companies that offer exhaust that work with the npp exhaust also and they are all pricey. Its the corvette tax basically.
Its a balance.
Yeah im mostly just reminiscing about Supra stuff. Making the past better than it really is! Corvette is gonna be a great handling cammed daily. Ol Supra will be a drag car someday!
Something seems off. I'd suspect the tune might not be aggressive enough down low? How much time was spent playing with fuel and timing?
What I'm really seeing is you need to raise the limiter to 7200 rpm and shift by 7000.
I'd be pretty bummed too that's a huge cam for such minimal gains and essentially zero butt dyno gains. The car feels about the same doesn't it?
What I'm really seeing is you need to raise the limiter to 7200 rpm and shift by 7000.
I'd be pretty bummed too that's a huge cam for such minimal gains and essentially zero butt dyno gains. The car feels about the same doesn't it?
BTW.....229*/244* duration and 10.5* overlap ain't really that "huge" for an aftermarket LS3.
KW