5s top mount IC?, reasonable? Options

[crankyelbow]

I've been pondering the turbo route, and I'm amazed how readily available and cheap the ct26 turbo is - along with the proper manifold and other bits.

One big way to cut the costs, and something I always wanted to try in my turbo yaris, would be a top mount intercooler. The response should be amazing with the minimal piping that would be used in such a setup.

Given the layout of the motor, it would seem to be EXTREMELY easy to route piping, mount the IC... in fact it seems the 3sgte uses a top mount IC stock (as did the turbo yaris in stock trim overseas)... BUT...

What would be the approx boost limits given this setup? Clearly the air wont be cooled anywhere near as effeciantly as with a FMIC, but given a hood scoop/heat shield, what are the approx limits? Has this been done on a 5s before?

[lagos]

Defined "sucked"?

You can put an egg on it and fully cook it.

This is not the same thing as the subaru top mount. Go look at those cars. Their topmounts are mounted at the back portion of the motor. On our cars they sit right on top of the hot engine, and just heat soak.

If you want all the benefits of throttle response, then setup a water to air system. Same benefits without the heat soaking and you dont have to cut up your hood.

[eggman40]

Defined "sucked"?

This is not the same thing as the subaru top mount. Go look at those cars. Their topmounts are mounted at the back portion of the motor. On our cars they sit right on top of the hot engine, and just heat soak.

x2

I kept a top mount on my 3s for a few weeks till I could afford a FMIC. IT SUCKED! It was always hot, you couldn't even touch it it was soo hot. subarus fire piston to the sides so the "header" pipes are far away from the ic and dont cause heat soak.

also IIRC the 5s throttle body comes out the side and not out the middle like the 3s.... so you would have to put in some really hard bends to get it to mate with the charge side of a top mount (either a2w or a2a)

why not get an intercooler that has both the charge pipe and the intake pipe on the right side??? that would shorten the length of pipe you need, especially if you clock the turbo.... and since you say your not going to boost very high, then you dont need to go through the hassle of making the a2w system work. AND it would be waaaaay cheaper....


I think the difference in performance bet. top or front mounts would be marginal at best with such low boost levels. not worth the thouble IMO