I am wondering why the jackson racing supercharger makes more power on a type R motor then a GSR motor is it the cams. Yes I know valves and a ported head with gain roughly 10whp but there is a huge gap in dyno numbers does anyone have any insight that they know as fact on this matter.

Also once you get into the 240-250 whp range whats the best suspension to run for SCCA I would like to hear from people who activley race on the circuit and have allot of experience. Aftermarket brands regardless of advertising are hit and miss. Is the type R suspension compatibe on a GSR

 

cause a type r motor makes more power to begin with..

 

Due to its higher compression. SC like higher compression (to a point) contrary to popular belief.

 

What if you have the same compression as the type R motor and more displacement in fact everything in the motor is the same as the type R motor except for the cams valves are the same pistons same compression course the crank may be diffrent I don't know.

I also wanted to know once you go up in horsepower whats the best autocross suspension to run.

 

slimsdizz, just go to a local autox and see what the fast guys are running and then buy that. The suspension is important but tuning the suspension correctly is even more important. from what I see though 99% of fast autox guys are running ground controls with konis. I'm sure if you call ground control and tell them what you want they'll hook you up.

 

Induction system is better, larger throttlebody, and the intake manifold supports more airflow.

Even the factory ITR cast exhaust manifold is better than the GSR.

This of course, if you are comparing a stock GSR to a stock ITR, with only a JRSC.

As soon as you introduce other modificiations, such as your 'what if's', the difference becomes more complicated to judge.

As for your suspension question, the most tried-and-true setup is a basic Koni/GC combination. Simply because of the adjustability and availability of parts/spring rates/setup experience. More direct suspension questions would be better answered in the Suspension sub-forum, or the Road Racing/Autocross sub-forum.

 

The reason I asked the question is because if you go to jackson racing website there dyno charts show the GSR making right at 240whp and the type R making 262 whp my car is making 243.2 whp but there is nothing else I can think of to do to the motor except cams so whats making all this power thats a huge whp jump. The type R header isn't the worlds best for boost I have the hy-tech tri-y header on mine. Compression is the same as the type R 11:1 head internals are the same as the type R so whats making this huge jump in WHP. All insight is appreciated someone out there has to know the answer

 

The head is not the same. GSR is a different casting from the ITR, and the ITR head has more aggressive cams and slight port work done from the factory.

 

K thx

 

the new owner wanted me to find out for him time to go pick out an STI in the morning.

 

A type-r head casting is the same as a b16, its just that the b16 heads that get a perfect cast get a green dot. Ones that don't get a green dot go to a b16 head. From there the green dot heads get a slight increase in flow from the factory, better valvetrain and intake manifold.the head flow in general compared to a gs-r could be making the power increase.

 

If everything else is the same in your motor except cams the answer should be obvious. The cams in the type r are better.

 

headflow=power

 

Are you comparing two cars which were dynoed on the same dyno? If not, the numbers comparison is not absolute as all dynos read slightly different. Run on a DynoJet then on a Mustang dyno...I've seen cars make 30whp less on the Mustang dyno simply because of the way it was set up.

 

very true, my buddy's del sol put down 434hp on a dynajet and then went for a dyno day on a mustang dyno and put down 378hp

 

k thx I'll let the new owner know