i am buying a turbo for my new car. i want a gradual ball bearing spool unlike my old t78. any suggestions?

 

The Turbonetics T66 you can expect to go 650+RWHP on race gas at 30PSI

While the GT3540 will go 525+RWHP on race gas at 20PSI (from what I have seen the Garrett turbo will nose over after 20PSI)

All depends on what you after in the long run ??? Obviously the Garrett should spool a little faster than the Turbonetics due to the difference in size etc.

 

i would love to see a dyno at 20psi comparing the precision t66 and the gt 35/40. thanks for the reply.

 

t66 all the way.

 

I had the exact same question a few weeks ago and then I talked to Shawn at A-spec, who's supplying the GT35/40. I'm going with the Garrett! Positive boost by 2200 RPM and 15psi by 3300!!

He said a guy dynoed 487 RWHP @ 19psi on pump gas. That's what I'm talking about!

I'm getting an aggressive street port and 3mm apex seals with my new build, so I can't wait to see what I put down. Should be another month or so...it's still sitting at Marvel Speed.

 

i have only seen one person make that kind of power. why isnt everyone else posting numbers? not as high?

 

Very interesting info there ianewk thanks .............. Well I can tell you that on my setup with a Turbonetics T66, Q trim rear wheel, ceramic ball bearing, turbo ported S4 block with S6 upper intake manifold, pump fuel with methanol enrichment activated in the higher rpm's I am making boost at 2500 rpm and 15 PSI by 3500 rpm. At 5000 rpm I am making 350 rwhp and at 18 PSI my setup is making 500 rwhp. I have since cranked the boost up and have made 600 rwhp on 27 PSI. I guess the main thing that numbers can't answer is the transient response between the turbo's ???

 

did you get my email or pm?

 

PM sent .......... what other info are you after ???

 

440rwhp @17 psi, stock block pump gas, Starts to make boost at 2200rpm has 15 psi @3000 spike to 18 by 3300. I dont think it will come close to the T66 on the top end but the GT35/40 is a great street turbo. I am impressed with how fast it spools. When I shut the car off I can hear it spinning for another 1-2 min.

 

whos doing your tuning zoomzoom.

 

ZoomZoom .............. I guess there is also a lot a difference in the seat of the pans feeling between our cars too as my car is an RX3 weighing in at a whopping 2500lb wet with me on board

 

Dave at KD rotary.

 

Has anyone actually wound there GT35/40 over 22psi?? and does it hold it all the way to 8500rpm??

 

Damn thats impresive.

 

There's been a change in plans.

After dealing with the drama of who has one, who doesn't, where I can get one, and how long it will take...not to mention who can rebuild it when something goes ping or boom...

...I've decided to go with the Turbonetics dual BB T-66 with all the trimmings (polished inside and out, oil and water injection, ceramic coating, etc).

It should be about a month or so until I get it back from MarvelSpeed, plus break-in time. After that I'll share the numbers. Until then let's just say really fast.

 

Cool ........ can't wait to see how it goes on your setup