edit more to FI please

 

Same dyno for both cars? Same tuner?

 

Yup

 

Post your graph. What were the cam gears set to? How does your brothers car compare in the midrange? Is his setup.EXACTLY the same or just real similar?

 

all cars are different so you cant be a numbers chaser. still decent power..hope you find your prolem. i had a lsvtec setup last year that made 420hp on 20psi and 110oct. turned out to be a bad head gasket and the last setup made 525 on 21 psi and e85..

 

numbers seem normal to me

 

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Seems to be good power like said you can't really expect the same exact #s was it the same weather and time of the year air can play some differences

 

he got tuned in May, in 70 degree weather. I got tuned today, 66-68 degree weather

 

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You almost never get the same results from the same set-up on different cars. It is what it is.

 

Post up the dyno graph

 

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I would be hard pressed to believe your brother's numbers and I am completely not surprised that the .63 housing died off at 8600rpm. It is what it is. Race your brother and see what happens.

 

That cam is too big for a GT30 with a .63 turbine housing..

 

Then why does his brothers car with a .63 make great power to redline with pretty much the same cam and same turbo? Heres a thought, are you guys exhausts the same?

 

Sorry, but 405 at 15psi on pump gas on a GT30 with a 'small' turbine housing is good power. I'm not going to waste time comparing minute differences with 2 different cars on 2 different days.

I did a car a few weeks ago that had Pro 1 cams and a GT30 and I got 430whp out of it, but that doesn't mean the cams were right for the setup. Too big a cam with too much backpressure is a really bad thing.

 

My post wasnt intended to be offensive im just curious myself. I personally know his brothers car and its not just a number the car made, it holds down the power.

 

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That power's not too bad. I made 440whp at 19psi on an 83mm 9.4:1 with a 3076r (20 degrees of timing). This was with stock GSR cams. As Tony said, those cams are too big for a 30r. Ive done a good amount of research on what cams to go with and Ive found those are simply too big. Get a different cam or different turbo, then up the boost for more power. If you want more power why did you stop at 15psi? I ran 19psi on 91 octane

 

I agree, that power isn't bad at all for a gt30 on 15 psi!

 

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put the stock cams back in

 

+1

 

I make last year on my st h2b coupe 546hp at 21psi with a gt35 turbo On pump gas 93octane