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RWDboy
Forums Junkie

Location:
South Australia
Registered:
July 2002

Re: GT4 modification and performance ...	Sun, 15 May 2005 03:56

The ST165 already has steel-wheeled CT26 turbine so you don't need to worry about upgrading that until you look at pretty high boost figures, I'm not sure on exact numbers but 17psi would be quite a bit for the standard CT26 and your inlet temps would be pretty high by that point! Headgasket must be changed for anything above about 10 psi Copper head gasket (try Ridgecrest) combined with o-rings in the head/block or a metal head gasket (available from lotsa places, TRD etc) will suffice. The ST165 pistons are pretty lame, I think there is weakness in the factory cast and they tend to crack when the boost goes up, anything above about 12 psi and you should look at new forged pistons. One thing that I would DEFINITELY look at with the ST165 in particualr (when upping the boost) is the factory intercooling system, and even a remote oil-cooler kit would be a good idea. The water temps frequently went up on my car on warm days when i had it under load (going up a 10% gradient hill at 100km/h for about ten minutes for example). There is too much heat in the engine bay partly because there is no ventilation for the heat in the engine bay, and partly because the factory cooling system is not sufficient. Look at getting some kind of heat out of the engine bay and definitely look at either a bigger heat exchanger for the water-to-air system, or alternatively ditch the water-air system and try to squeeze a bigger front mount air-air intercooler in. If you stick the front mount air-air in though you are DEFINITELY going to have to think about air flow in the engine bay. Currently I'm looking at new pistons and a copper head gasket for my car and because I can't afford a better fueling system nor intercooling sticking it at about 11 or 12psi. You will be getting pretty high injector duty cycle at about 200hp (at the flywheel) and they will be pretty much be maxed out at 220hp. That translates to about 110kw at all four paws for 80% duty cycle (normal) and about 120kw at all four paws for 90% duty cycle (friggin high!). I'm expecting around about 100-105kw at all paws with my set up. Of course, on a hot day that will drop off ridiculously Oh and in regards to clutch - my clutch has endured a few 6000rpm launches and is still okayish Doesn't slip at all. But I haven't put much more power through it yet so I can't tell how it'll hold up to any big modifications. [Report message to a moderator]

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