Hasn’t anyone had a gtx42 or 45 on dyno yet?

 

Ive seen Supras and a few other cars, but nothing rotary powered. I think Revvin has put one on the dyno, but no results have been posted.

 

i dont think they make much more power until your pushing them hard, so on the majority of cars, you wont see much of a improvment over the normal ones but i may be wrong so if anyone wonts to chip in go right ahead.

 

Well let me correct myself as Ernie has made 40 bhp more the he did on his gt42r and that’s also on the smaller GTX4294 as opposed to his last turbo a gt4202r!! And it spooled faster too

 

Yes he did at 30 psi. I don't think there is a gain under 25psi. Maybe Ernie can put up a before and after dyno.

 

yes a befor and after would be nice or if he can over lay the two dynos on one sheet.

 

Yeah, its true they dont shine until high boost, but they really can handle the high P/R and maintain efficiency. They are more efficient at lower boost levels also, but the compressors arent magic. They just need to be pushed hard.

 

I don't have the dyno sheets for comparison. We were in a rush to get to the race. Ray did most of the adjustments after datalogging at the track. Funny, the car picked up 4mph by raising the boost just to 32psi in the finals. Im curious what it dyno's at. Gonna run 35psi this weekend at the Pan Ams.

 

I have a GT4294R 1.15AR on my current setup, which will be dynoed in the next few weeks. I should hopefully be running methanol and 28Lbs of boost on a street ported engine, would be nice to then upgrade to a GTX after for comparison.
Looking at the compressor map it peaks at 4.9 pressure ratio that’s like 58 psi (3.9 Bar) Nutts

http://www.turbobygarrett.com/turbob...essorMap_e.gif

35psi damn that’s gonna fly and it will still be 78% efficient.

Good times Ernie, welldone

 

I had one customer dyno from overseas, I'll see if I can find the info. Unfortunately I just might have lost a whole bunch of info as my hard drive failed so I've been trying to get all the info as well as customers info I can off of that hard drive.


~S~