Quote:
Originally posted by mellowboy
I believe the lower compression the better. Stock sir b16's have 10:2:1 i believe so its a safe motor to put turbo in.
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The higher the compression, the more power the motor will make, the more power the motor will make, the better.
When high compression and boost come together, tuning becomes essential. That is the problem with most turbo Honda enthusiasts...tuning. For the most part, people don't know the first thing about it. That is why you see so many blown motors. The lower the compression, the more room for error you have when tuning...but, that also means, the less power you are going to make on comparative boost levels. On the flipside, the higher the compression, the smaller window of error you have for tuning mistakes...but...the more power you will make, on comparative boost levels.
Even 10.2:1 is high (awesome!)...Take a stock B16A, on 12psi...and compare it to a B16A with a built bottom end using 9.0:1 pistons, on 12psi...That stock B16A is going to kick the built B16A's ass.
The problem with the B18C5 (ITR) motor is not the compression itself, rather, it is the lightweight pistons that it uses. 11.0:1 CR is awesome, you just need good tuning...but on the stock bottom end, the pistons are not made for boost, and are brittle, if you will. If you were to rebuild the B18C5 bottom end...keep the 11.0:1 CR, just use pistons made for boost.
High compression + high boost + great tuning = ONE FAST FUCKING HONDA!