Hey HT guys/gals. Looking for some first hand input on two builds im going with just as a "for fun" type of thing til i get my GSR sleeved and build for boost. Im shooting for 190-200whp on pump gas. (93,94 octane) I have all the parts except pistons in my garage just laying around, so i need to just finalize my decision. This is not my full DD, i have another car w/ AC and an auto tranny for when i have to drive up and down the freeway for work and its HOT. anyways heres my setups....

GSR block bored 82mm
GSR crank and rods
Nippon CTR pistons w/ .045 thick HG (12.2:1 CR)
B16 head,ITR cams w/ S2 adjustable gears, valve grind
B16 s4c LSd tranny
RMF header
Whale ***** air intake
Custom testpipe and apexi ws2

My other option is the same build, just w/ p30 pistons and a cometic HG (.030) thickness.
It will put me right at 11.2-11.4:1 CR

Like i said it will be on 93 sometimes 94 octane pump gas. I want 190-200whp. both builds should be safe and reliable. i just want to first hand words, searching didnt help me much.

Thanks

 

Use JDM type R style pistons instead (or the P30's if you must) and an AEM 3" CAI with larger cams and you should be good to go. (Assuming you're using at least a 2.5" exhaust or larger with a good tune.)

 

http://www.zealautowerks.com/bseries.html

 

and your point? i have done that already.

 

I have been battling back and forth and was really leaning towards the P30's. I cant find the JDM ITR pistons in 82mm bore ANYWHERE or i would use those no questions asked. I already have a CF whale ***** intake i got from a buddy for pretty much free so i dont wanna throw more money out the door for something i already have. YES i know they may not get you PEAK power, but in not willing to throw 200 bucks out for 5whp when i already have something that will work. This build is serving as a "budget build" if you would just to get my car on the road while i get my next boost motor built. I just wanna play around w/ some OEM parts and see what i can do with them, including cams. I have a set of 01 ITR cams w/ S@ adjustable gears. it will be tuned on neptune on a dyno by arguable one of the best tuners here in WA, James at speedfactory. I have the apexi ws2 cat back which is like 2 3/8" pipe i think and i ave a testpipe thats 2.5 inches. like i say 190-200 is the goal. i would be happy w/ 185. i wanna try and hit 13's in the 1/4

 

What's my point? More like what's your question. You said you had all the parts except pistons and want to run on pump gas. So, WTF else do you need to know besides which pistons will give you what compression ratio?

If all you want to know is how high you can go with compression, do a search - its been covered a hundred times already.

 

I Know what the compression ratios will be, i entered in all the info including head millin and block decking that has been done.
CTR's 12.2:1
P30's 11.5:1
I was looking for first hand experience w/ similar builds and what people had gotten out of them. I was looking for how many people run 12:1 CR on pump gas and if they have problems with it. I searched, that was not discussed. Im not new to this.

Im leaning towards the P30's more because I want to be able to adjust cam timing and not have to worry as much about piston to valve clearance. I also need to be able to drive this car for a bit and have it last, i just wanted some more input.

 

I'm running USDM ITR pistons, 81.25mm. The block and head have both been machined.
11.6:1 compression ratio.
If you really need 82mm pistons that are nearly stock look at http://www.rsmachines.net/pistons.html

 

RSmachines does not sell the P30's that i want to run.

 

buy some type of aftermarket piston then, Wiseco, JE, Arias, whichever