what IC are you using Trappy?

Pro Alloy with SIP

I've got a mate with a standard Fleamapped coop I could test drive. I'll have a go and see if i can find a difference in lag when the snow clears.

thanks mate, that would help alot, i just want whats best yet only necessary for my coupe to achieve and be happy at 300bhp ish.

Hope this snow clears up soon lol!

Trappy - you are spot on. A big roller bearing turbo that can be efficient at 2 bar will produce much lower charge temperatures at 1.3 bar than a hybrid at the same boost level that is right on it's limit of efficiency - so there is less 'work' for an IC to do.

There are two reasons to get the charge temps down:

1. for safety - anything over 60 degrees is asking for detonation and a nuked piston. At 1.2 bar a standard coupe will reach this level in a long pull in 4th gear, and exceed it. It wont if you just blast 1st, 2nd and 3rd to the redline, which is why a lot of coupes run a gtec chip without issues on a road car. Even most tracks rarely see you doing long 4th gear pulls - though there is a cumulative effect if you are pushing the car hard for long periods of time.

2. For power - you want the charge temps in the 20's or 30's for more power. colder air is denser and so you get more 02 to burn = more power.

A badly designed or cheap IC can actually hinder you by adding a restriction that the turbo has to push air through - bigger is not always better. This is more noticeable on smaller turbo cars where the turbo struggles to hold boost at the top end anyway. In that case you will loose boost at the top end, and increase lag as the turbo has to 'fill' the IC before the engine gets the extra air.

I have a smaller IC its half the hight of the pro alloy types a touch longer and as deep. I have never gotten to the top of third gear, so for me its fine. I had custom pipe work done although its not as short as some peoples.

youve never gotten to the top of third gear??? how much approx has this setup cost you?

Don't know the IC was on the car when I got it I just got rid of half the pipe work and made sure it does not blow the pies of.
The car does ~70Mph in second gear top of third (red-line) would be a speeding ticket.
One day I'll track it but until then its fine as it is.

thanks Jef_uk id be interested in your intercooler dimensions/pictures if possible.

Think that is the only image I have of how it was almost.

edit actually its no longer than the pro alloy might even be a touch shorter.