HTA GT35r vs PT6765?
#29
Joined: Mar 2001
Posts: 30,580
Likes: 567
From: FL-->NJ/NYC again!
#30
Racing Rotary Since 1983
iTrader: (6)
Joined: Oct 2001
Posts: 6,136
Likes: 563
From: Florence, Alabama
re the GT4094r:
i finally am getting my clutch package and driveshaft for my T56 trans this monday which means i won't be more than a couple of weeks from the dyno... so i will have some answers.
the compressor map shows 80 pounds at 30 psi. i do have a dyno sheet from a forum member showing 617 hp at 24 psi. it is STD correction so it would be 601 SAE which is the only language i speak.
the compressor map shows 78 pounds at 2.6 pressure ratios (24 psi) but deliverability doesn't end w the last posted efficiency line, it ends w rpm stall... which is when the rpm line becomes vertical. the tuner was Ray W who is highly accomplished.
i have a contact who was head of R&D for Garrett and he has always suggested i not get too obsessive re compressor maps. i guess i get what he is saying. we all know that dynos can read whatever you want and do differ a bit.
and finally, as someone who has seriously raced for 22 seasons it is hp under the curve that wins all races. quite honestly, i couldn't care less about whether i have a top tick at 600, i want as much hp under the curve as i can get.
consider the crappy stock mazda transmission ratios:
2nd gear is down 42% (!) from first.
3rd is 31%
4th and 5th are 28%
you'd better be asking the question what do I have at 5600 for hp. port design as well as turbo configuration play a huge role in determing midrange hp on a turbo'd motor. if you are using the stock FD gearbox and are serious about going fast you want to see 400 rwhp at 5500 or better given the wide ratios.
hc
i finally am getting my clutch package and driveshaft for my T56 trans this monday which means i won't be more than a couple of weeks from the dyno... so i will have some answers.
the compressor map shows 80 pounds at 30 psi. i do have a dyno sheet from a forum member showing 617 hp at 24 psi. it is STD correction so it would be 601 SAE which is the only language i speak.
the compressor map shows 78 pounds at 2.6 pressure ratios (24 psi) but deliverability doesn't end w the last posted efficiency line, it ends w rpm stall... which is when the rpm line becomes vertical. the tuner was Ray W who is highly accomplished.
i have a contact who was head of R&D for Garrett and he has always suggested i not get too obsessive re compressor maps. i guess i get what he is saying. we all know that dynos can read whatever you want and do differ a bit.
and finally, as someone who has seriously raced for 22 seasons it is hp under the curve that wins all races. quite honestly, i couldn't care less about whether i have a top tick at 600, i want as much hp under the curve as i can get.
consider the crappy stock mazda transmission ratios:
2nd gear is down 42% (!) from first.
3rd is 31%
4th and 5th are 28%
you'd better be asking the question what do I have at 5600 for hp. port design as well as turbo configuration play a huge role in determing midrange hp on a turbo'd motor. if you are using the stock FD gearbox and are serious about going fast you want to see 400 rwhp at 5500 or better given the wide ratios.
hc
#32
Finally Howard Coleman, someone who uses the saying correctly "couldn't car less" 99% of people say "i could care less" WTF! then why dont you lol... sorry that line is just a huge pet peeve for me, ok bye sorry...
#34
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