HTA GT35r vs PT6765?
Joined: Mar 2001
Posts: 30,807
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From: FL-->NJ/NYC again!
Joined: Oct 2001
Posts: 6,279
Likes: 728
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
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...
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Clacor
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