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Scca Gt2 Hp ?
I'm trying to get an idea of how much horse power I need to shoot for to run scca gt2 next season? anyone willing to disclose or is this a big a secret? thanks!
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Gt2 is not a hp/weight formula. You need to build the motor to gt2 rules. Iirc, There are restrictor sizes for different motors like ls6 oem stock vs. Ls6 with a max valve lift etc. And a c5 running an ls3. So check the gcr which is online. Ping oli on this forum. He is less about secrets and more about close fun racing. He is in that class and can tell you much more.
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It is kind of a HP to weight formula in that you pick the engine and weight from a chart in the rule book. See page 345. https://dk1xgl0d43mu1.cloudfront.net...pdf?1530669060 I think a LS6 (with a stock intake and throttle body) built to the limit of the rules or LS2/L76 (with a 75mm flat plate restrictor) built to the limit of the rules will make about 450 rear wheel horsepower depending on the dyno. It’s all very confusing as you also have to read the STO section of the rulebook to see what exactly you are allowed to do engine-wise (cam .600”, compression 12:1, ported heads with 1% weight penalty, etc...). I have no idea what kind of power a restricted LS3 or LS7 will make. |
Originally Posted by fatbillybob
(Post 1597691228)
Gt2 is not a hp/weight formula. You need to build the motor to gt2 rules. Iirc, There are restrictor sizes for different motors like ls6 oem stock vs. Ls6 with a max valve lift etc. And a c5 running an ls3. So check the gcr which is online. Ping oli on this forum. He is less about secrets and more about close fun racing. He is in that class and can tell you much more.
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Originally Posted by clubracer23
(Post 1597691755)
It is kind of a HP to weight formula in that you pick the engine and weight from a chart in the rule book. See page 345. https://dk1xgl0d43mu1.cloudfront.net...pdf?1530669060 I think a LS6 (with a stock intake and throttle body) built to the limit of the rules or LS2/L76 (with a 75mm flat plate restrictor) built to the limit of the rules will make about 450 rear wheel horsepower depending on the dyno. It’s all very confusing as you also have to read the STO section of the rulebook to see what exactly you are allowed to do engine-wise (cam .600”, compression 12:1, ported heads with 1% weight penalty, etc...). I have no idea what kind of power a restricted LS3 or LS7 will make. |
I would be curious to know what engine Aquilante is running in his GT2 Corvette even though that is only a small part of the winning combination. |
You will not make 500-550 rwhp with these rules and restrictor plates. All dynos not being exactly equal, you should be in the 450-480 range. LS3 isn't the way to go as you have to weigh 250 pounds more and run a smaller restrictor. Not going to make up for that with .060" larger piston diameter.
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At 3250lbs you absolutely could make 500-550whp, fairly easily if you went ls7. |
Originally Posted by mp4659
(Post 1597697315)
At 3250lbs you absolutely could make 500-550whp, fairly easily if you went ls7. I think it's 3200 lbs. for a "built" LS7 with a 65mm flat plate restrictor or 3325 lbs. for a "OEM" LS7 in the current GCR. |
A built ls7 could do 500-550 through a 65mm sir. My ls7 (rip) was stock other then headers and heads done (stock cam, intake, throttle body etc) made 470whp. We detuned it to 400whp for Nasa st2. I would like to build an all forged ls3 this go round. |
Originally Posted by DJFIN
(Post 1597696371)
You will not make 500-550 rwhp with these rules and restrictor plates. All dynos not being exactly equal, you should be in the 450-480 range. LS3 isn't the way to go as you have to weigh 250 pounds more and run a smaller restrictor. Not going to make up for that with .060" larger piston diameter.
I tend to agree with this statement. I have been racing GT2 since around 2013. Right now the LS3 option does not seem to be the most successful Corvette variant to choose from. |
It seems that SCCA thinks a “OEM” LS7 (3325 lbs.) makes more power than a “built” LS7 with a 65mm flat plate restrictor (3200lbs.). FWIW I have a SCCA GT2 Corvette and am trying to figure this out for myself. For now I have decided to go with a built L76 with a 75mm flat plate restrictor at 3030 lbs. (including a 1% weight penalty for ported heads). :banghead: |
https://cimg0.ibsrv.net/gimg/www.cor...d4b3ec887.jpeg My ls7 let go in a pretty spectacular/horrifying way at lime rock. Long story short, it took my car with it. So I’m starting the long process of a complete rebuild of car and want to be able to run in both classes/sanctioning bodies. I took this photo laying on my back looking through where the oil pan should be.... |
Originally Posted by Olitho
(Post 1597697740)
I tend to agree with this statement.
I have been racing GT2 since around 2013. Right now the LS3 option does not seem to be the most successful Corvette variant to choose from. |
Originally Posted by clubracer23
(Post 1597697949)
So, what do you think is the best engine/weight option for a SCCA GT2 Corvette?
https://cimg6.ibsrv.net/gimg/www.cor...590a35459b.jpg |
Originally Posted by mp4659
(Post 1597697842)
https://cimg0.ibsrv.net/gimg/www.cor...d4b3ec887.jpeg My ls7 let go in a pretty spectacular/horrifying way at lime rock. Long story short, it took my car with it. So I’m starting the long process of a complete rebuild of car and want to be able to run in both classes/sanctioning bodies. I took this photo laying on my back looking through where the oil pan should be.... |
You’re a glutten for punishment Mike.... Look at those crazy SCCA rules. Keep it simple with NASA and power to weight. You’ll be like Adrian last season changing body kits between events. Even he just gave up and just runs the car in SCCA trim and leaves some on the table when he runs with NASA. |
Originally Posted by Hi Volts Z06
(Post 1597699087)
You’re a glutten for punishment Mike.... Look at those crazy SCCA rules. Keep it simple with NASA and power to weight. You’ll be like Adrian last season changing body kits between events. Even he just gave up and just runs the car in SCCA trim and leaves some on the table when he runs with NASA. |
Originally Posted by RX7 KLR
(Post 1597698566)
The dominate car has been a C6 at 3130lbs with a 75mm plate (these are 2017 specs, pretty sure it only had to weigh 3030lbs in 2016).
https://cimg6.ibsrv.net/gimg/www.cor...590a35459b.jpg |
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