PT67 vs 62-1 Which Turbo...?
09-02-05, 04:31 PM
#1
so ...no time for this
Thread Starter
PT67 vs 62-1 Which Turbo...?
First of all... after 5 months….I finally blew my engine! ... and I’m considering to try another turbo but first I need to explain why and get your thoughts to make a decision... also the story might help someone out there to NOT TOUCH what is working fine!
As some knows, my turbo set-up is a T3 .84 MP turbine / 62-1 Turbonetics compressor. I did 430 rwhp @ 21 psi. That power for 21-psi was a bit compromised due the backpressure but I was able to street race the car on pump-gas almost everyday without any single problem. I even race on track several times at pressures up to 26 psi with T-111/mix.... This was what I thought the ultimate set-up in terms of no-lag, drivability and reliability,,,I was extremely happy with the set-up...... However, although the spooling time was minimal up to 17 psi, from that point forward it was progressive; said, from the time I hit WOT, it was slightly increasing boost from 17 to 21…23…25 psi and whatsoever. This was because I was controlling the WG from the upper inlet (closing the diaphragm) and using a weak (9 psi) spring. Then, to gain the same spool up for 21-psi, I decide to change the spring to a 21-psi spring and set the WG control from the lower inlet (opening the diaphragm) as is commonly controlled. … I did it and vuala!!!... what I thought it was a rotary T3 housing spooling time was not even close to what it turn out to be after changing the spring... I really can't explain it... it was obviously to much cfm for the T3 outlet for that much boost...the response was ridiculously fast!!! though, instead of 21-psi, the lower available boost was at 23-psi. I then was in may way home to change the spring to an 18-psi one to avoid what happened later..... In may way, I found a Supra and I was like "the hell with it!!", so I downshift form 4th to 3rd gear and hit the pedal progressively to full throttle and boom!..... the WG boost source to open the diaphragm didn't come on time and the boost pressure raised over 30 psi at my boost gage while I was accelerating...
The point is... since I was so happy with my T3 spool-up with the weak spring set up... I was thinking to change the housing to a T4 .84, or change the whole turbo to a PT67 T4 .81 that has been good rated in some threads here (ie. kabooski & carl)… I think either of them would give me about the same quick response... and less “safer” backpressure… thought the PT67 would turbine should spool faster, it might be the same output (in term of spooling) compared to the 62-1 due to the larger compressor wheel of the PT67…
As some knows, my turbo set-up is a T3 .84 MP turbine / 62-1 Turbonetics compressor. I did 430 rwhp @ 21 psi. That power for 21-psi was a bit compromised due the backpressure but I was able to street race the car on pump-gas almost everyday without any single problem. I even race on track several times at pressures up to 26 psi with T-111/mix.... This was what I thought the ultimate set-up in terms of no-lag, drivability and reliability,,,I was extremely happy with the set-up...... However, although the spooling time was minimal up to 17 psi, from that point forward it was progressive; said, from the time I hit WOT, it was slightly increasing boost from 17 to 21…23…25 psi and whatsoever. This was because I was controlling the WG from the upper inlet (closing the diaphragm) and using a weak (9 psi) spring. Then, to gain the same spool up for 21-psi, I decide to change the spring to a 21-psi spring and set the WG control from the lower inlet (opening the diaphragm) as is commonly controlled. … I did it and vuala!!!... what I thought it was a rotary T3 housing spooling time was not even close to what it turn out to be after changing the spring... I really can't explain it... it was obviously to much cfm for the T3 outlet for that much boost...the response was ridiculously fast!!! though, instead of 21-psi, the lower available boost was at 23-psi. I then was in may way home to change the spring to an 18-psi one to avoid what happened later..... In may way, I found a Supra and I was like "the hell with it!!", so I downshift form 4th to 3rd gear and hit the pedal progressively to full throttle and boom!..... the WG boost source to open the diaphragm didn't come on time and the boost pressure raised over 30 psi at my boost gage while I was accelerating...
The point is... since I was so happy with my T3 spool-up with the weak spring set up... I was thinking to change the housing to a T4 .84, or change the whole turbo to a PT67 T4 .81 that has been good rated in some threads here (ie. kabooski & carl)… I think either of them would give me about the same quick response... and less “safer” backpressure… thought the PT67 would turbine should spool faster, it might be the same output (in term of spooling) compared to the 62-1 due to the larger compressor wheel of the PT67…
09-03-05, 09:11 PM
#2
Originally Posted by AImec Racing
First of all... after 5 months….I finally blew my engine! ... and I’m considering to try another turbo but first I need to explain why and get your thoughts to make a decision... also the story might help someone out there to NOT TOUCH what is working fine!
As some knows, my turbo set-up is a T3 .84 MP turbine / 62-1 Turbonetics compressor. I did 430 rwhp @ 21 psi. That power for 21-psi was a bit compromised due the backpressure but I was able to street race the car on pump-gas almost everyday without any single problem. I even race on track several times at pressures up to 26 psi with T-111/mix.... This was what I thought the ultimate set-up in terms of no-lag, drivability and reliability,,,I was extremely happy with the set-up...... However, although the spooling time was minimal up to 17 psi, from that point forward it was progressive; said, from the time I hit WOT, it was slightly increasing boost from 17 to 21…23…25 psi and whatsoever. This was because I was controlling the WG from the upper inlet (closing the diaphragm) and using a weak (9 psi) spring. Then, to gain the same spool up for 21-psi, I decide to change the spring to a 21-psi spring and set the WG control from the lower inlet (opening the diaphragm) as is commonly controlled. … I did it and vuala!!!... what I thought it was a rotary T3 housing spooling time was not even close to what it turn out to be after changing the spring... I really can't explain it... it was obviously to much cfm for the T3 outlet for that much boost...the response was ridiculously fast!!! though, instead of 21-psi, the lower available boost was at 23-psi. I then was in may way home to change the spring to an 18-psi one to avoid what happened later..... In may way, I found a Supra and I was like "the hell with it!!", so I downshift form 4th to 3rd gear and hit the pedal progressively to full throttle and boom!..... the WG boost source to open the diaphragm didn't come on time and the boost pressure raised over 30 psi at my boost gage while I was accelerating...
The point is... since I was so happy with my T3 spool-up with the weak spring set up... I was thinking to change the housing to a T4 .84, or change the whole turbo to a PT67 T4 .81 that has been good rated in some threads here (ie. kabooski & carl)… I think either of them would give me about the same quick response... and less “safer” backpressure… thought the PT67 would turbine should spool faster, it might be the same output (in term of spooling) compared to the 62-1 due to the larger compressor wheel of the PT67…
As some knows, my turbo set-up is a T3 .84 MP turbine / 62-1 Turbonetics compressor. I did 430 rwhp @ 21 psi. That power for 21-psi was a bit compromised due the backpressure but I was able to street race the car on pump-gas almost everyday without any single problem. I even race on track several times at pressures up to 26 psi with T-111/mix.... This was what I thought the ultimate set-up in terms of no-lag, drivability and reliability,,,I was extremely happy with the set-up...... However, although the spooling time was minimal up to 17 psi, from that point forward it was progressive; said, from the time I hit WOT, it was slightly increasing boost from 17 to 21…23…25 psi and whatsoever. This was because I was controlling the WG from the upper inlet (closing the diaphragm) and using a weak (9 psi) spring. Then, to gain the same spool up for 21-psi, I decide to change the spring to a 21-psi spring and set the WG control from the lower inlet (opening the diaphragm) as is commonly controlled. … I did it and vuala!!!... what I thought it was a rotary T3 housing spooling time was not even close to what it turn out to be after changing the spring... I really can't explain it... it was obviously to much cfm for the T3 outlet for that much boost...the response was ridiculously fast!!! though, instead of 21-psi, the lower available boost was at 23-psi. I then was in may way home to change the spring to an 18-psi one to avoid what happened later..... In may way, I found a Supra and I was like "the hell with it!!", so I downshift form 4th to 3rd gear and hit the pedal progressively to full throttle and boom!..... the WG boost source to open the diaphragm didn't come on time and the boost pressure raised over 30 psi at my boost gage while I was accelerating...
The point is... since I was so happy with my T3 spool-up with the weak spring set up... I was thinking to change the housing to a T4 .84, or change the whole turbo to a PT67 T4 .81 that has been good rated in some threads here (ie. kabooski & carl)… I think either of them would give me about the same quick response... and less “safer” backpressure… thought the PT67 would turbine should spool faster, it might be the same output (in term of spooling) compared to the 62-1 due to the larger compressor wheel of the PT67…
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