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kenikh kenikh is offline
3 restos WIP = psycho
 
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Join Date: Feb 2005
Location: North of Exit 17
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From what I know about the racing history of the 3S-GT engines boost needs
> to be in the order of 1.5-1.7(24-28psi) bar boost to achieve this. Toyota
> originally used a CT44RT Turbo in their 1986 prototype racer at Le Mans
> this turbo boosted 2.5bar(37psi). The engine was rated at 550hp @ 1.4bar in
> 24Hr racing trim and 750hp @ 2.5bar in qualifying trim. These figures were
> achieved with a 2140cc(89x86) engine with a max 9000rpm and 8500rpm in race
> mode. These turbos had twin mechanical water cooled wastegates, I don't
> know that I want this sort of complication.
> In 1987 they switched to a CT44ST which offered 1.8(26.5psi) boost and used
> the RT unit for qualifying. They also increased the cylinder wall thickness
> by 2mm to cure a bore cracking problem( I think it was 2140cc motor, the
> 1998cc unit wasn't produced until 88/89) this engine was rated at
> 680hp/8500rpm and 470 ft/lb torque @ 5500rpm (as much as 900hp had been
> extracted on the test bench).
> The only other info I can find relates to the rally engine which produced
> 380-400hp on restricted turbo (more if you cheated like TTE).
> I believe that the CT44ST is used in GTP racing. Does anyone know where I
> can get one or more info about them? Either that or if you know of another
> unit that will flow the amount of air needed at the required boost.
> My mechanic suggested to me, that given the limited amount of cooling air,
> I might get better results by using series charge cooling i.e. water/air
> followed by air/air would give the best cooling with the least increase in
> intake volume. I have seen an article on an Aussie MR2 with a turbo charged
> 3S-GE and a neat water/air inter-cooler sitting above the cam cover and I
> have enough bits from the parts cars A/C system to make one. Has anybody
> had any experience with this type of charge cooling (it was used on 88/89
> Celicas)?
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