Hi guys. I'm a 19 year old college student planning on buying a 99-01 Acura Integra. Now, I know that when I get my money right, I will boost it. With that said, should I get the GS-R or the Type R? I read somewhere that the GS-R has a lower compression ratio than the Type R. Is that true? I also read that the Type R has an LSD and the GS-R doesn't. Is that true? If both of those statements are true, could I put the B18C5 head on the B18C1 block and have lower compression that the stock Type R?

 

Welcome to HAN. :cheers:
1. Yes. The ITR (Integra Type R) has a higher compression ratio than the GSR.

2. Yes. The ITR came with a helical limited slip differential. The GSR did not. Quaife sells a very nice LSD that retrofits into the stock GSR transmission.

3. No. The head has very little bearing on the compression ratio. By swapping the ITR head onto the GSR block, you're not fixing the compression "problem". To lower the compression on a B18C1 (the GSR's motor), you replace the stock high-pressure cast pistons with forged pistons that have a slight bowl shape at the top, displacing less air, thereby lowering compression whilst retaining the stock stroke length.

I used quotes when I said "problem" because many a GSR have been turbocharged on stock compression ratios without incident. Fuel delivery and ignition timing must be carefully managed to prevent detonation at all costs -- because detonation is what causes catastrophic failure. True, a higher static compression raises the risk of detonation, but it's manageable. Däs Schmoo has a turbo GSR and can speak to the FI conversion process with authority.

More to the point, the ITR head has long-duration, high-overlap cams suited for a naturally aspirated tune. In a turbo application, the motor will begin to bleed boost back into the intake manifold and the intake charge will be further diluted as exhaust gas piles up waiting to get past the turbocharger's impeller. So there's really no point in swapping to the ITR head.

Once again, welcome to the board. :cheers:

 

Hi welcome to HAN :wavey:
if you're planning to boost you should just go for the gsr, like theotherdave said you can always get lsd later.

 

Thanks for your info guys. I really appreciate it. I think I'm gonna get the GSR now, and handle the rest later.

 

welcome...youll love this place!!

 

yea go with the gsr if ur gonna boost. dont even worry about lsd, just find the right rpm for launch. it tests ur skills as a driver welcome to HAN and good luck with the teg when u get it.

 

either or would be fine under boost application, your margin on error on tunning will be less, but otherwise either motor will be fine under boost, but i have a 01 turbo gsr personally and i am very happy with it

 

a common misconception is that the type-r (usdm c5) pr3 head yeilds higher compression than the gsr (or usdm c1) p72 head...

the truth of the matter is that the lid height on the gsr is lower and that means that it's addition to the compression of any b series block would be more than the pr3 cast c5 head on the same block.

and there goes dave again calling the gsr a b18c5 :loco: other than that he is most certainly correct.


i'd suggest getting a GSR and worrying about turboing later.

 

get a good alarm also with a pager protect your investment!!!!!!

 

In the realm of all man's knowledge, being one digit off on a banal engine code is nothing to get your knickers in a twist over. In context, it was perfectly clear which motor I was referring to. Drop it.