Lower the compression

[Cammoe]

So I have just recently bought a turbo kit and what is even better is that the turbo kit fits perfectly on the car. The down side before I can start the boosting experience is that I need to lower the compression of my motor. I am running the 5sfe in my 93 celica and yes I do know the 3sgte swap isn't to hard, but I would prefer not to do the swap. Does anybody know where I can pick up some lower compression pistons? I also need to know if anybody knows where to get forged connecting rods for it as well. If anybody has any experience in this area please let me know, any information would be better than none and greatly appreciated.

[Luckynumber5]

You can turbo that engine just fine with the stock compression but to get any good power out of it you'll need to have it tuned very well.

Best set is to buy a spare 5sfe and use that to fabricate your parts. You can take a piston out of it and send it off to any piston manufacturer and they should be able to make you some lower compression forged pistons and rods. I believe wiseco has made 5sfe pistons in the past so give them a call. But the easiest way to do this is to buy a cheap long block and build that, then swap it in when you have everything built up, don't forget cams and please don't use something crap like an safc for fuel management, spend the money on an e-manage or better yet an smt-6. do it once, do it right, and happy boosting

[Cammoe]

And the compression ratio of the 5sfe engine would be around?

[Luckynumber5]

9:1 or 9.5:1 I believe, you could safely turbo it even if it were 10:1 its all in the tuning.

[Cammoe]

I appreciate the knowledge... if you have any other info that might be useful it would be greatly appreciated

[Luckynumber5]

Well, Ive seen 5sfe turbo builds make over 220whp on a stock engine (low mileage) but the powerband sucks, you can really see how the stock cams let the enigne down past 4k rpm.

What I would do is turbo the stock engine and keep it conservative so nothing breaks, then start building up a spare engine like I said and then get some cams for it, forged 8:1 pistons and rods + headwork + cams + Megasquirt is not an expensive build and you can get more power out of it than you will be able to put to the ground.

Traction will be a major problem, if you have the money consider going with a built automatic from importperformancetrans.com (IPT) they can set you up with a lsd and a reliable transmission and you will be able to give awd cars a damn good race, but its very expensive, more than the engine will cost to build. Plus on the auto is once its built, youll never have to worry about a cluch going out or crunching a gear.

Thats only if you are really looking at like 400+ ho out of the car. Its very doable but remember, its still a wrong wheel drive Celica

[alltracman78]

C:R is 9.5:1

He's right.
Stock internals are fine for 6 PSI or more with the right tuning.
You shouldn't have too much trouble finding pistons for the 5SFE though.
There are a few High HP MR2s running the 5S block and the 3SGTE head, so building a 5S block is easier than you'd think.

Reliability is in the tuning. At least you have a 92 ^ engine with a knock sensor. This helps a bit.

A buddy of mine has a 5SFTE in his 94 GT and he's running 24X WHP and 27X ft/lbs torque on an unopened engine with the CT27.
He is using a 98 5SFE, which comes stock with a metal HG....
Regardless, it can be done.

[presure2]

the 93+ 5sfe is fine for low to moderate boost 5-12psi...
GOOD intercooling,
and decent tuning with the right sized injectors are the key.

[alltracman78]

Speaking of the Devil.......