: Quick dyno question



Davidstan
10-17-07, 03:55 PM
Does anyone know what the approx bone stock rwhp is on the 06 STS V8 N* ?

Curious George
10-18-07, 01:40 PM
Cadillac rates the Northstar at 320 (flywheel) hp. The rule of thumb, as I understand it, is that driveline losses cost 15% of that. So a good estimate is 320 x 0.85 = 272. Round it to 270 hp. When I had my stock '99 Lightning dyno'd, the shop measured only when the torque converter was locked while in 4th (the transmission's direct 1:1 gear). (It peaked at 327 rwp.)

Let us know what you get.

Davidstan
10-18-07, 03:09 PM
Cadillac rates the Northstar at 320 (flywheel) hp. The rule of thumb, as I understand it, is that driveline losses cost 15% of that. So a good estimate is 320 x 0.85 = 272. Round it to 270 hp. When I had my stock '99 Lightning dyno'd, the shop measured only when the torque converter was locked while in 4th (the transmission's direct 1:1 gear). (It peaked at 327 rwp.)

Let us know what you get.
Thx for the reply but i was wondering if anyone had hard data or have heard what they dyno to. My guess was going to be 245 whp which would account for a 23% loss but i may be wrong.

shudog
10-28-07, 02:40 PM
15% hp is a little light... automatic trans will have more loss than a manual... figure 20%. I'd bet around 260 at the rears... love to see some hard numbers though. Every dyno is different too.

Curious George
10-28-07, 04:04 PM
15% hp is a little light... automatic trans will have more loss than a manual... figure 20%. I'd bet around 260 at the rears... love to see some hard numbers though. Every dyno is different too.
Power loss thru an automatic is the same as thru a manual when the torque converter is locked and the transmission is in something like a 1:1 direct drive gear.