I will scan my dyno tomorrow and post , but after some small new mods and a fresh core my Rx7 hit 515 rwhp 410lb torque at 21 psi. From what I hear the car was jumping off the rollers so the HP number is a little low. Street port Core, 3mm seals and has it been studed. The turbo has upgraded internals but I think the big TB and 2000cc injectors did the trick. I only had a short ride in the car but the torque was HUGE compared to my last core.




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Replaced the PFC, the picture should express my feelings about that....



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The Micro Tech ...Ma ma makes me Happy ! Now I need to surf that sub forum

 

Nice numbers I have a t72, can wait to see what numbers I can get.

 

Very nice. There is something about a nice clean white FD that jumps out at me.

 

Very nice man! Who did the engine work and tuning?

 

Nice engine bay and nice car!

 

T78 what is the compressor ind. size? And turbine housing size?

Car looks clean and simple, very niceee

i'll be waiting on dyno graph

 

I'm really surprised the throttle body didn't leak.

 

I was waiting on that comment

Im pretty sure the t78 is a 63-65mm for the person above who asked. Been a long time since I have seen many people running that turbo, still great setup when you consider the age of it.

 

my records show the T78 is

66 X 90 compressor

65 X 74 hotside

7.584 aver sq inches compressor V 7.0 for a TO4z/GT500

nice numbers, are they SAE?

 

I tought the t78 was bigger.

 

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Nikky Y had a bigger wheel crammed in his T78 so the OP may have a modded t78. I dont see many t78 cars being pushed past 20psi. Good numbers for an ancient turbo.

 

NICE!

Who did the tuning?

 

You need metal legs to drive something like that!

 

are you guy saying the t78 will run out of air pass 20psi? on stock port motor? I have t78 and will be tuning soon, hoping this turbo will make power up to 30psi

i'm thinking of sending out to get the compressor wheel upgraded maybe 70 or 72 mm wheel

 

pic

 

When the T78 was common place, it was rare to see anyone run over 17psi of boost on it or any other turbo for that matter. 450rwhp was thought to be the limit back in those days with the exception of a few drag cars. Now it is common place for guys to run 20-24psi on pump gas with water injector and 30 psi is common on c16. I say turn it up and see what happens. Should have similar results to what you see out of 67mm turbos these days. Im sure that turbo is capable of 550rwhp or more, there where guys back in the day running low 10s in the 1/4 with that turbo so power has to be approaching mid 500s or so.

 

I was making 454 at 18 psi on mine, and that was with a damaged turbine. So 500 is easily achievable.

Back in the day when it was a common turbo, auxiliary injection was not common, and not many people ever pushed past 17 or 18 psi.

I believe the OP Has more of a T88 (upgraded compressor)

 

Howard is correct on the measurements..... and the T78 should be just fine with boost pressure in the upper 20s

 

Now we should remember the T78 was built especially for Supras and Skylines and to push beyond 20 psi. It likes the 25-35 range very vell. That's what it's built for. I did see a compressor map and it was not very efficient under 20 psi of boost.

A freind is gonna dyno his this summer, and he's aiming for 25+ psi on it Gonna be interesting to see how it's gonna go

JT

 

Old school but it gets the job done. Low cost and with the 4inch down pipe I could boost to 23-25 psi easy and put down another 40 HP. But at this time no need I want to enjoy the extra HP for a season and learn how to drive the car again. The Kazz is a huge improvment and with some decent tires the car should be fun to drive. Its so easy to pull the trigger on this set up even as "laggy" as people say the turbo is. I will post a in car clip this weekend.

 

So I pulled the trigger and sent out my t78 to get upgraded , i'm going with 72mm billet wheel . should up grade the turbine wheel too?? standard greddy is 65mm

Nuvolari you said you have 4" downpipe what turbine housing you using?

 

Greddy T78 is just a Garrett To4R.

550rwhp is about the limit around 26psi.

If you upgrade the compressor wheel its a complete waste without doing the turbine wheel, as a P trim wheel is at its limit @ 26psi/550rwhp.

 

does anyone have the measurements for the t88-34d

 

For turbine size,

T88:
out: 72.3mm
Exducer 85mm

T88H:
out: 79mm
Exducer 90mm

For those big BHP, go with the T88H, not the usual T88!

Best REgards,
Iwan