i was wondering...if i planned on going sc sumetime in the future, would this be a waste of money. am i wrong when i say that high comp is better for sc and lower comp is better for turbo?

 

I believe you would be wrong. High comp pistons + forced induction of any type = boom.

 

High compression pistons + forced induction + decompression gasket = OK correct me if I am wrong, it's just a guess.

 

Generally speaking, lower compression works best with turbo. These pistons would be acceptable for SC, just probably not optimal.

PS - I may be selling mine folks! That install ain't cheap!

PPS - Thanks Boe! With those details, my decision is now tougher!

 

I guess I wonder why you'd bother to raise CR with pistons to then lower it with a thicker head gasket..... Why not just do a lower or sotck CR forged piston?

 

The basic answer is that some people will buy anything.

If he's not SCing anytime soon, it would be good mod for now. Then he could just throw on the decompression gasket and return to stock CR. And he'd still have the stronger forged pistons.

 

I don't want to SC my car. Just saying if you ever wanted to SC your ride you don't have to swap pistons again just get a thicker gasket.
NA is my way for now at least. :P
As far as installation, try looking into different shops. Even mustang shops could be able to swap the pistons for you. Who knows maybe they are bored and need to play around with some 4 cyl.
I will keep my set of Ross' pistons.

 

Can be done? Do you know how thick the gasket would have to be? I don't think anyone would stack half an inch worth of gaskets for any FI w/ high CR pistons.

Just like on the net, someone put a turbo on a 4g92 MIVEC w/ its high CR. Funny thing, I'm willing to bet the person didn't tune it well enough, because the car was being sold later. I guessed the guy wanted to prove a point, but he didn't want to stick around for the long term tests. High CR + FI = PITA to tune.

Rules of thumb
Low CR = somewhat lower TQ but can take high boost #'s. MPG suffers a bit.
Higher CR = better TQ, decent MPG, and must take lower boost #'s.

Example:
ITR + Turbo = PITA to tune if he's shooting beyond +25 psi or 40 psi like those insane Supra guys.


BTW: domestic shops will likely not work on any foreign 4 banger cyl head . . . principles of making power is a bit different. On a domestic cyl head, you have a lot more lead way taking off material.

 

Well, my guess no work. High compression + FI = no good.

 

"BTW: domestic shops will likely not work on any foreign 4 banger cyl head . . . principles of making power is a bit different. On a domestic cyl head, you have a lot more lead way taking off material."

Domestic shops wouldn't tune your ride but swaping pistons shouldn't be hard for them.

 

what about something a bit larger then the t28 like say a 16g or the t3/4... and run those on 10 or 10.5 pistons... it wouldnt spool till later in the rpm, would give you a nice extra kick at say 4500 rpms (guessing) and you wouldnt have to tune the entire powerband like you would with a smaller turbo. i doubt you could do that with an emanage (possibility with the pressure sensor and some larger injectors) but with a standalone i would think this would be a pretty fun car to drive with it tuned. Throw a nice lil cam into the mix to increase air about about the same rpm and you would have a lil devil with some nice tq downlow. Just a thought.

 

CR is still high no matter where in rpm band you are... thus you'll have to boost low no matter what. I don't recommend it. If you have emanage and can pull enough timing and richen the fuel enough you can do it but its kindof working against yourself to have the higher CR pistons in any case.

By the way... when running Boost, changing you cam to bigger would actually cause more issues if you have high CR pistons. It will be a nightmare to tune/map.

 

What are your plans Boeturbolancer? Are you going for emanage/standalone/tune a piggyback?? Cams?

 

I'm leaning towards emanage as there is timing to be had in the lower rpms and timing to be pulled up top once i get the cam/gear/other items setup. I'm shooting for 140-160whp/wtq before tuning and higher with.

 

Your setup is almost exactly the same as mine, what do you mean by timing? What's wrong.