My question is, How much more horsepower could you get from installing b16 pistons into a stock ls b18a1? Anybody?.

 

Do it and dyno. That's the only way you will know for sure.
(not trying to be a dick)

 

Hey thats so true!! But the question might be for those who have done it already.. thanx!

 

PR3's yeild 10.8/1 compression, P30's yeild 11/1, and PCT's yeild 12/1

Which do you plan on using?

And most people upgrading their pistons are swapping cams and valve train to take advantage of the raised compression. Then you have I, H, E differences and the tuning aids used to tune. Now do you see why we can't give you a number?

Ok, I give, 10 hp for each point in compression raised, lol.

 

I just installed some PR3's in my B18A1. But like was already mentioned above I also installed a ported JG head, crower 402 cams and a Blox intake manifold so I really wont know how much the pistons helped.

Going from the stock 9.2 to1 compression of the B18A1 to 11 to 1 compression should be worth a noticeable gain in HP and torque throughout the power band which is way more important than a few peak HP.

 

The compression raise will really benefit from better cams. If you are going to take the head off it would be a cinch to put in some Crower 403/404s and the supporting valvetrain. With 404s, PR3s and tuned on a dyno I bet you put 20-25 more ponies to the ground.

 

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