Without a very good tune no FI car will last.

As for high compression and Fi its been done for years. But I wouldnt recommend it for a first timer or unless you have enough cash to completely rebuild the motor and make it a tank before you do it.

Its all about cyl wall presure, and what they can handle. If everything can handle the presure then it will be fine.

 

So you are saying, stick with the 9.1 pistons and follow that road, and if you choose 8.5 then build the the other internals too?

 

9:1 is fine in my book for boost. Off boost drivability is easier to obtain.

 

ya im gonna go with the turbo set up. no limits with the turbo

 

no limits?

 

8:1 Forged pistons and high boost to compensate for the compression...that is the way to go for reliabilty and power.

 

True but not everybody is going to run high boost on a FWD car..

 

If you aren't planning on running high boost then you shouldn't be worried about internals at all..

I don't see why anyone in their right mind would put high compression pistons in a car that's going to be running FI. It's just asking for problems.

Look at any factory FI engine, it has low compression.

 

I will...

then again, someone said I wasn't an ordinary person anyway...

I don't know to many people who would run F/I on 11:1 ratio pistons. When the new Civic SI came out, and the magazines jumped on it, for everyone I saw that had either a turbo or S/C on it, they dropped new lower compression pistons in the motor. Because the SI's motor came stock with 11 compression pistons.

 

Aria makes a nice set of 9:5:1, most likely what I will be running if I decide to take it further.

 

it is difficult to make reliable power with high compression pistons, but it CAN and has been done... just dont forget, the higher the C/R, the less the lag

 

To sum it all up...

If you are building a N/A setup, go with the 11 compression

If you want to cool little sound of a Turbo, go 8 compression

 

At what psi does "high boost" start?

 

I would say 18+

Anyone else chime in, as I use to think 14 was high. But I saw the error of my ways...

 

It depends what turbo and how much CFM it flows...

 

The ones that are out now for the tC....turbonetics,ZPI,greddy......

 

All differnt size turbos.. Greddy and ZPI have similar turbos. Id let travis speak for that as he owns a kit.

 

Greddy = 18G

ZPI = 16G

So similar though, that I don't believe there is a drastic difference to warnt only upgrading from a 16g to an 18g. When the difference between the Big 16g that ZPI uses vs. the 18G GReddy is equipping, we are talking about a ".10" difference in sizes. Not enough of a difference to feel or see changes on the dyno.

I know the 16g that ZPI uses, flows 550 CFM.


Someone else can chime in on the Turbonetics kit's turbo, as I don't know the specs.

 

N/A or Turbo setup?

 

Turbo setup