Got some new dyno numbers
Got some new dyno numbers Ok, got an update after getting back from the dyno. We pressure checked the system and found a HUGE leak. Fixed the leak and I am able to get way more boost.
Was only able to hit 15psi on the dyno but boost was going 16-17 on the highway aftwards. Back pressure was 40-45psi (fluctuated) at 16psi over 5500 rpms. At 13 psi the back pressure would to 35 over 5500 rpms.
The dyno stats. Temp 85 in the dyno room. 91 octane gas, 14 degrees timing at before 4800 ramping up to 19 by 6000. All pulls done in 2nd gear because I was worried about the length of the pull on 91 octane. Keep in mind these numbers are from a th400 with an unlocked torque converter.
On 10psi the car made:
415 uncorrected HP @ 5500 rpms 452 SAE
492 uncorrected TQ @ 4300 rpms 537 SAE
AVG HP from 4500-6500 is 445 SAE
On 15psi the car made:
476 uncorrected HP @ 5500 rpms 519 SAE
517 uncorrected HP @ 4500 rpms 563 SAE
AVG HP from 5000-6500 is 510 SAE
Hp was a flat line on the dyno but on the road it actually feels like it pulls harder over 6000 rpms which it would not do on the .70 housing.
It looks like i need a larger a/r housing to help with the back pressure when I rev over 5500. The back pressure comes on fast once it gets to 5500, up until that point it's more like 2:1 and then goes 3:1. Holds the same back pressure out to 6500 rpms.
Witht he .70 a/r housing in august I managed 424 uncorrected hp (470 sae) at 5500 rpms. With this power I was able to run 11.0 @ 124.9
Was only able to hit 15psi on the dyno but boost was going 16-17 on the highway aftwards. Back pressure was 40-45psi (fluctuated) at 16psi over 5500 rpms. At 13 psi the back pressure would to 35 over 5500 rpms.
The dyno stats. Temp 85 in the dyno room. 91 octane gas, 14 degrees timing at before 4800 ramping up to 19 by 6000. All pulls done in 2nd gear because I was worried about the length of the pull on 91 octane. Keep in mind these numbers are from a th400 with an unlocked torque converter.
On 10psi the car made:
415 uncorrected HP @ 5500 rpms 452 SAE
492 uncorrected TQ @ 4300 rpms 537 SAE
AVG HP from 4500-6500 is 445 SAE
On 15psi the car made:
476 uncorrected HP @ 5500 rpms 519 SAE
517 uncorrected HP @ 4500 rpms 563 SAE
AVG HP from 5000-6500 is 510 SAE
Hp was a flat line on the dyno but on the road it actually feels like it pulls harder over 6000 rpms which it would not do on the .70 housing.
It looks like i need a larger a/r housing to help with the back pressure when I rev over 5500. The back pressure comes on fast once it gets to 5500, up until that point it's more like 2:1 and then goes 3:1. Holds the same back pressure out to 6500 rpms.
Witht he .70 a/r housing in august I managed 424 uncorrected hp (470 sae) at 5500 rpms. With this power I was able to run 11.0 @ 124.9
