Alright everyone, I have an s2 with efi conversion, hybrid t3 turbo and its only running at standard boost standard injectors. It has a FRST rad and it just keeps over heating. I thought it just because its hot weather (Australia) but even when it's cool out its doing it. I took out that valve for the water to keep flowing no use ! What's the biggest radiator I can fit into this S2 engine bay ? I've a massive front mount so kind of need a skinny enough rad to get the job done. Cheers !!

 

Is your cooling fan operating?

 

Hybrid turbo will flow more air at the same boost level, so if I presume you're on standard management it's probably running lean and then getting hot.

Also, isn't a Fiesta rad smaller? Could be something that simple.

The valve you mention, do you mean the thermostat? If so, chuck that into a saucepan and heat it up. If it opens just before the water is boiling it's fine and you should put it back.

 

A T3 was never fitted to EFI (Fiesta) RS Turbo's so even a standard T3 will be too much for standard injectors (blue) and ECU calibration, Matt's for example ran lean after 3500rpm at 7psi of boost.

 

A mate of mine is running a 2.0zt on frst management that is standard, he melted his forged bottom end

 

Get the 82 degree thermostat, cold air feed to the air filter, make sure u have the fan on the rad n not the intercooler n, if u can, cut the bumper for better air flow. Give that a go. Failing that, bigger injectors and a remap. I bought a stainless direnza rad and a full size RMD intercooler. Im running near 190bhp and even after a ragging for half an hour or so, the gauge doesnt move above halfway.