whats the difference? obviously the GS-R is cheaper.... what would need to be replaced to get the same output as a b18c5?

 

Well if you're comparing car-to-car, bone-stock ITRs put down about 165 to the wheels. A typical i/h/e GSR will put down about 155 to the wheels.

As far as what's different from the ITR to the GSR, there's the throttle, intake manifold, head, cams, valvesprings, pistons, header and exhaust. So to "make" your GSR motor an ITR motor you would have to change all those things.

Of course if you're going to be spending money you might as well get the best possible parts than simply trying to match the ITR motor.

 

i was comparing the motors...

no cam?

 

A type r is a GsR bottom end with different pistons. It has a B16 head (instead of a GsR head) with slightly upgraded valvetrain (cams, springs, retainers) intake manifold, throttle body and exhaust header (all stated by fat bootay). You can make whats called a 'poor-man's type r' by putting a b16 head on to a GsR bottom end.

 

An i/h/e GSR is about 10 whp short of a stock ITR. Slap i/h/e on an ITR and the gap widens again.

If you took an i/h/e GSR motor and put in some cams that are hotter than ITR cams (skunk2 Stage 2, JUN Type-III, Toda Spec B) you'd probably top the output of an ITR.

 

gsr motor can handle more compression no problems too?

 

i think the itr has 10.8 or something gsr has 10.6

 

In this market the ITR runs 10.6:1 and the GSR is 10.4:1. That accounts for a very minimal power increase.

Type-R retainers are no different than GSR ones.

Type-R intake valve springs are the same as GSR exhaust valve springs.

The B18C5 is what you might call a complete package with balanced upgrades across the board. You can however, top its output with different mods to a B18C1.

 

very helpful thanx!