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Which Is Better To4z Hks Or T78 Trust Greddy

Top_RPM

By Top_RPM,
in Engines & Forced Induction

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Top_RPM Explorer

Top_RPM

Posted
Posted

hi all,

i just recently finished building my R33 GTR engine (cp pistons with tomei rods) running standards turbo. and iám cunfused wich turbos are better To4z Hks or t78 33d trust.

can anyone get me some Info about these turbo's and wich one is better 4 me if im thinkin of 400+ KW at the 4 wheels .....

post-19793-1125411832.jpg

manage13 Proficient

manage13

Posted
Posted
Has anyone actually seen a T04Z on an RB26 with std head?

Good question Roy! Here are some graphs from HKS. The turbo was fitted on a R32 GTR with 272 IN/EX cams.

But I would go the HKS T04Z over the Trust T78!

post-4055-1125453779.gif

Roy Grand Master

Roy

Posted
Posted

1 bar at 4,200rpm???? Out of interest how often are ppl abel to match HKS claims of reponse and power...i have never really looked too much at the HKS website

I would have thought that std RB26s struggle to make 1bar at 4,200rpm...or is it a matter of whilst they may not be in full stride at 4,200rpm, they are actually makign that level of boost...they always seem to offer their best power over 4,500rpm when std?!?!?!

Sydneykid Grand Master

Sydneykid

Posted
Posted
hi all,

i just recently finished building my R33 GTR engine (cp pistons with tomei rods) running standards turbo. and iám cunfused wich turbos are better To4z Hks or t78 33d trust.

can anyone get me some Info about these turbo's and wich one is better 4 me if im thinkin of 400+ KW at the 4 wheels .....

Personally I don't use plain bearing turbos, so the T78 wouldn't make it onto my list.

Does anyone have a compressor map for a T04Z?

I had heard (more than once) that the Garrett T04Z and the HKS T04Z are exactly the same.

If you are doing circuit work with that GTR I would be looking at a pair of 2530 Kai, similar power and better response.

:rolleyes: cheers :)

discopotato03 Grand Master

discopotato03

Posted
Posted

I remember searching somewhere in US sites for Garrett GT42R's and finding some mob that does custom housings for GT42R cartridges to recreate the HKS T51R's (KAI/SPL?) .

Now that some of these monsters (GT40R's and GT42R's) are available with ball bearing cartridges they no doubt will wind up on RB's , but with more conventional mounting flanges than the HKS T51R's with there specific V band mounts to suit their exclu er expensive manifolds .

For what big turbos cost I would not be without the ball bearinga either , the oil shear resistance on big shafts is considerable so bushes ? no way .

Again what Arnie said , cheers A .

discopotato03 Grand Master

discopotato03

Posted
Posted

Hi peoples , I did some sniffing around and it seems that Garretts GT40R and 42R are similar deal to HKS's T04R's and T51R's .

For the juicy pics search GT40R Pictures and look at the two image search pages .

Then drop down to the 9th site (FresnoRacing etc) for some pics comparing GT40R and T78 .

With a bit of searching there may be a twin entry T3 flange with suitable ARR housing to make it fit . These turbos are getting really big (huge) so maybe twins are not so bad after all . Note the 40R and 42R use threaded bore compressors rather than a nut .

Cheers A .

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