Anyone have PR3 pistons in their B18A/B?
What do you think of it? Worth doing?

do you plan on doing any sort of tuning?
just putting the pr3 pistons in the LS block would be kinda pointless. you'd have all that compression and no cams, no tuning.... basically the engine would suffocate...

well, i would assume a tune would be needed.
like I'm not expecting "out of this world" gains.
I understand it's only bumping compression,
but PR3's and a tune, is worth doing, no?
It'll would livin' up the motor just a nad.
A VTEC head can always be mated later on.
I'm asking cause I ran into someone selling PR3's at a good price, and I know those pistons in a stock B18 would bring comprssion to aroun 11.4:1
That obviously means it's gonna need 91 octane fuel, right?

PR3 pistons are said to raise your CR to 10.8:1 on c-speed and 11.3:1 on zealautowerks.

I personally wouldn't bother installing these pistons then getting it tuned as it wont be worth the money spent IMO. To get it tuned, you can get it on crome, but you have to pay for tuner + dyno time and for a slight CR increase, I wouldn't justify spending that amount on such a small improvement.

if anything pickup some crower 403's to run with this aswell to give you more use of your CR

the whole point of using pr3 pistons is so you can match your compression to the cams you are running, it jsut happens they are the perfect match for a b18b with crower 403's 404's or vtec heads with stage 1/2's or ctr cams.

just putting those pistons in a stock block without cams is kinda pointless. comrpession power gains arent linear.

What about the 402's, they'd be okay too, no?
I'm worried the 403's are too aggressive for the street.
I do see that alot of you guys like the 403's, even for the street,
but how's your idle and mpg with those cams over stock?

the 405's are too aggressive for the street, im gonna leave it at that...

i dunno how many times i said dont bother with anything less than the 403's but oh well.

and fyi my mileage dropped maybe 1-2 mpg once i tuned my car with 404's vs stock LS cams

i cant get to any of my videos now but my username on putfile has a few videos of my car with 404's

I have ran the crower 404 cams on the street with pr3 pistons, tune, I/H/E, msd ignition system, Cam gears, vtec oil pump, Ctr crank pulley and a small shot of the juice from time to time with no probems. Only real problems I had was traction because of no LSD and sore leg from the unsprung clutch. Oh and all this was with a hydro gsr trans.

I run the 403's in my integra now. They do fine on the street, in my opinion. As far as gas milage and idle levels go i didnt see a dramatic drop in either of them. It also depends what else you have on your car, as far as intake mani and exhaust that might play a factor in ilde and gas milage.

don't put in the pistons without cams. you are going to end up wanting to put them in later anyways. just save up and get some 403's if you don't want a drastic change in your idle and get them tuned. your gas milage won't change that much but will be a little difference. with more air you need a little more fuel. once you raise the compression you will be running 91 octane or higher so keep that in mind.

the compression on a full ls b18b with pct ctr pistons will be a 11.5.1 with pr3 it is a will be a 10.8.1 and with jdm p30 it will be a flat 11.0.1 compression ..

i would go with the pct ctr pistons with shot pined rods.

B18C1 GSR pistons = 10.3.1 compression.
That's the way I went....

good upgrade but we reccomend JDM ITR pistons instead, very good compression with heat skirts to coat the sleeves better

yeah i generally recommend those too but they arent drop in like the b16's are on b18b rods.

i have the moly coating on my pistons and i have to say (maybe its just placebo) but it seemed that the engine revved real real quick..