Originally Posted by gsr converters
Ive posted a couple of times about dropping a type r into my gsr. Everyone i talked to even you guys said to fix up the engine thats already in my car and make it better than the itr, So here i am, at your mercy. I want to make about 290 to 310hp. NA My car has 130k on the motor, where do i start. port polish, bored out, pistons and rods, camshafts/gears, what ever to help me accomplish my goal. thanks alot
290, at the wheels?
N/A? On a street-driven car?
Keep dreaming.
You're looking at 13:1 compression, requiring 100 or 106 octane race gas.
That gas will sell at about $6.00 / gallon and due to the lead content, it will quickly overwhelm any catalytic converter, rendering it dead and polluting grossly. Your idle will be lumpy as hell and your bottom end will suffer.
Assuming you're using a stock bore B18C1, you'll be running on the ragged edge of volumetric efficiency. Think of the powerband for the IDRC all-motor class cars. It's all from 5K to 9K, which for the street will require taller gear ratios and more speeds. Budget a couple thousand dollars or so for the Quaife 6spd gearset for the Y80 transmission.
I can easily see the build cost eclipsing $10k. In all honesty, a K24 block and K20A head combo would be a better bet for mid 200s at the wheels.. but even then you're committing $5K to the drivetrain alone.
That same $5000 will build a very strong turbocharged GSR.
If you've got a $7K budget and smog isn't an issue, call up DRAG or RevHard and buy their bolt-on turbo kit. With about 240whp at your disposal, you'll be very well off in both torque and horsepower gains that suit your stock gear ratios.
I mention $7K as a budget to have funds in reserve to rebuild the bottom-end stronger should the worst happen. With a set of forged internals (maintaining the stock bore & stroke) and a sleeved block, you'll have the ability to turn up the boost beyond 7psi. At that point, the only limitation is fuel management... bearing in mind that bigger injectors (550cc/min plus) are less accurate at low throttle openings.