atm im all stock except for a cai. 60k miles. im planing on improving performance in the very near future. (s/c, etc) im thinking of getting some 89 or 90mm bore pistons, along with some other things. how much of a difference does a bigger bore make? should i stick with 88.5, 89 or go to 90? or is there anything past 90mm? (ive heard there isnt much room) new to the performance modding business thing so any input is greatly appreciated.

 

90mm from what I have been told by many engine builders is the safest to push the 2AZ-FE to after being sleeved. There is a 92mm but isn't recommend by engine builders I have spoke with. It will make a slight difference but only a slight difference. Are you planning on N/A or boost.

Stock tC = 2362.1564736 CC's

90mm bore = 2442.90816 CC's

Increase of 80.7516864 CC's

4/5's of a liter.

 

thanks for the info. im planning on getting the trd supercharger. ima get the 9.0:1 CR pistons

 

Are you planning on running a different pulley for higher boost? If you run the stock pulley I would not change the CR there really isn't a point.

 

yeah what he said, you got to be running high boost to take advantage of boring and low compression piston.. otherwise you will just loose power.. i would even go for a higher compression between 7-9lbs of boost on a sc

 

do 11:1 with the 7lbs stock - i think itd be pretty badass tuned right you should have no issues with detonation on that low of boost

 

How much boost would I have to apply on the 9:1 compression pistons to get the same power as 7-9 psi on the 11:1 pistons? I was planning on getting new rods and adding more boost than stock but if it's just better to go with 11:1 and stick with stock boost I might do that.

 

i havent heard much of supercharged tc getting built internals prolly like only 3 or 4 ive heard in here.. so dont have an exact answer, maybe somebody else could chime in.. but having heard about problems w/ trd sc, i would stick with 7-9 psi boost and go with high compression.. adding boost to it will give additional stress to the charger and cause it to prematurely fail.. but the smallest pulley i've seen is that 14lbs pulley like the size of AA battery i dont think you could go higher than that

 

false....100 cc != 1L
A liter is 1000cc or 1000ml

 

Too tired I meant 4/5's of .1 liter. lol. Almost 2.5 vs 2.4

 

or how bout some 92mm bore w/ sleeves and high compression piston.. the walls will be thinner but its only gonna be low boost s/c so it should be fine.

 

ive been trying to look around and the only pistons i can find with an 11.0:1 compression ratio are 89mm bore, and the biggest i can find is the 90mm bore with 9.0:1 cr. maby im not looking in the right places, anyone else able to find anything better? (90/91/92mm bore with 11.0:1 CR) i dont wanna push it too far so i was thinkin 90-91mm bore but i can only find 89mm.

 

Find a company you want to go with and then ask if they will make some for you.

 

CP and JE both will do the pistons but you will have to contact them.

 

Wiseco too.....

 

An increase in displacement is always worth power. If your worried about the bore go 89 mm. You should put a set of good rods in it while you have it apart. I reccommend 9to1 with F/I. 11to1 with boost will be a pain to keep alive on pump gas, even in an all aluminum engine. If you still want a little more go, add some N2o or a water meth kit.

 

ok noob question if i get a 90mm pistons do i need a 90mm head gasket

 

Its all good, Dont know unless you ask. You will probably need a 92mm gasket. All I know of are stock and 92mm. And I dont think the stock is big enough for 90mm bores.

 

dude just run 10:1. If they are making your pistons custom bore, it shouldn't be a big deal for them to customize the CR too. I mean they are already making oddball pistons. But 10:1 should yield a little more power than stock at the same boost, but should still be safe and you wont have to run a billion pounds of boost on your S/C and destroy the bearings. And +1 to throwing some beast rods in there too.

 

10to1 should work if you keep the boost at stock levels with the forged pistons and good rods.