cochi

can you install another stock intercooler in the A4? Will it help cool the turbo more? any other alternatives other than a FMIC?

Andy Hedin

...your easiest choices would be:

1) Replace the stock intercooler with TAP's "Sport" intercooler (about $890)

2) Install a front-mount intercooler. Turbo5 sells a nice one and APR is coming out with a new one as well.

I don't believe there is room for an additional intercooler on the passenger side. Even if there is, you're probably on your own with fabricating the entire system.

Doug K

The intercooler doesn't actually cool the turbo per se...it cools the air charge. As for adding a second IC like in the TT225, I don't know if you'll be able to fit one in on the other side (for a symmetrical appearance). So that means you stuck with the FMIC, and as far as those are concerned you're better off getting one large efficient cooler rather than having 2. Remember the more "pluming" there is the more pressure loss you get (I know it may be marginal but it a loss none the less). I hope this helped, and like I said I'm no expert so take this with a grain of salt ;-)...

RVTS4

The intercooler is used to cool the compressed air from the turbo not the turbo itself. When you compress air it gets hot, which is a bad thing for mixing with gasoline.

1-BAR

Re: You would have to move alot of stuff down there+

CGP

It will increase turbo lag because of the added hose length, and the S4's are one IC per engine bank and we would add ours in series. Air would go through IC #1 and then through IC #2. It works on the TT (as you point out) though.

Larry Sr.

The reason for the intercooler has less to do with the mixing of gas & air than the density of the mix. The hot compressed air also expands making it less dense & therefore counteracting some of the very effect it is intended to have.
the intercooler cools this hot air increasing its density & therefore getting more into the manifold.