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T66 Or Gt42 ?

menphus

By menphus,
in Engines & Forced Induction

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

depends what spec mate, post the full details of each your looking at.

Considering the GT42 can be ordered with any range of wheels and housings (as i bet a t66 can also) then its virtually a case of how long is the piece of string in this case as the question is too general

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The Dan Grand Master

The Dan

Posted
Posted

The T66 is only rated at 700hp whereas the GT42R is rated at 800+...

T66 = old crap GT42R = new + improved design and twin ball bearing cartridge.

Also beware of cheap Chinese copies as many of these are circulating Ebay at the moment and are very very poor quality.

EDIT-R31Nismoid-you are not a trader, nor is FI a for sale section

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discopotato03 Grand Master

discopotato03

Posted
Posted

JVC the GT42/GT42R use either

94mm 56T (70.3mm inducer) compressor , max flow ~84lbs at ~ 22lbs boost

102mm 53T compressor , max flow ~ 95lbs at ~ 33lbs boost .

Compressor type for both is BCI-18 or GT series .

Turbine for both is 82mm 84T UHP or GT series .

The once Garrett T66 , rights were sold to Turbonetics , is

91mm 52T (65.5mm inducer) with max flow ~70lbs at ~ 25lbs boost .

I think these normally use TO4P trim (74mm 76T) turbines .

Garretts answer to the T66 was I think the TO4R compressor which is 84mm 63T and good for ~ 75lbs flow at ~ 26lbs boost .

The TO4R is said to be better spooling (lower boost threshold) than any of the above and judging by its major diametre and trim size it seems logical . The fact that its compact enough to fit in a TO4S compressor cover is a bonus . It is used in HKS's (rebadged Garrett) TO4R and TO4Z with TO4 P trim turbines and in bush bearing form just about any turbine practical ie T350 (75.5mm 70 or 76T) , TO4 O (74mm 69T) , TO4 P , TO4 GTQ (79mm 70T) , TO4 GTS (81.3mm 85T) and probably 82mm UHP turbine from the GT42 .

The Americans really like this TO4R compressor up to about 750-780 Hp as its efficient at low and high pressure ratios and not prone to surge . If you go searching for it they sometimes call it the GT67 wheel - they like to call compressors by their inducer diametre (66.7 = 67) for some strange reason .

There are some ball bearing alternatives to the TO4Z using it ie GT3567R and GT4067R which obviously use GT35 or GT40 BB UHP turbines in their native turbine housings .

Cheers A .

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