Ok I wanted to get an opinion on the following setup:

1. Complete tune up, changed sparkplugs, larger fuel injectors, new fuel filter, etc.

2. 70 mm throttle body
skunk 2 intake manifold
valvetrain (I was thinking JUN)
AEM V2 intake
DC sports header (4-1)
catback exhaust with racing cat
type r tranny
stage 3 clutch
aluminum flywheel

What will this net me at the wheels ? thanks guys

 

1. You don't need larger fuel injectors until after you tune with the stock ones and they can't flow enough.

2. What does "valvetrain" mean? New cams plus valvesprings and retainers?

3. With aggressive cams you can benefit from raising your compression ratio, if you don't mind oopening up the motor.

4. If you're going to be running aggressive cams and a higher CR, you will see the most gains from a header with a 2.5" collector and a 2.5" catback exhaust. Nobody (well, excluding Hytech) makes a 2.5" bolt-on exhaust so you would have to have that made custom.

5. Ratther than drop the cash on the ITR transmission, I would just get a Quaife diff for your GSR transmission.

 

The Quaife will do wonders for your handling, and seeing how you have a GSR, the ITR tranny isn't really worth the extra $$$. Now if you had a LS I would say differently, but I think you'd be happier with a Quaife.

Minus the "valvetrain" you listed, the other mods (all I see are bolt-ons?) should net anywhere from a 10-20 (def. high end) whp gain with a rather large loss on the low-end. Not sure if the 70 mm throttle body is really necessary.

Shingo

 

Hmmm......you said there would be a loss of low end power, as if the GS-R can afford to lose any more low end power..............ok I think the best deal then is to go with booty's original choice; and save up for the supercharger.........

 

70mm throttle body? the skunk2 intake manifold opening is only 64mm go with a 65mm since its the closest

 

he can get the im port matched to the tb.