2008 Silverado, 408, KB racing GT91 turbo kit
#331
#334
I am reasonably sure I will be looking at you in my rear view mirror for about 2 seconds until you are spooled up and rolling. Then I expect to see a red blur go by !
#335
#337
Made 977rwhp on the local dyno. 23psi by the boost gauge and 20.5psi ECM.
Not sure which is right?? Anyway they believe their dyno reads a low! Who knows though? How many different ones do you go to until you believe them?? I'll post the video and graph tomorrow..
Not sure which is right?? Anyway they believe their dyno reads a low! Who knows though? How many different ones do you go to until you believe them?? I'll post the video and graph tomorrow..
#338
Go to the track and find out what your trap speed is and go to a certified scale and get your weight then youll know fairly close. Those calculators arent perfect though as I dont think they take into account the aerodynamics of our bricks. Another way to figure it is by how much fuel youre using and know the BSFC of your engine.
If by ECM you mean your 3 bar map Id say the ECM is correct.
If by ECM you mean your 3 bar map Id say the ECM is correct.
#339
Where is your gauge refrenced at? Even 977hp is nothing to sneeze at, thats some serious power on the street!
I think your best way to find out your power is like what 1slow01Z71, put it on a certified scale and then use your 1/4mi ET and MPH. No dyno is going to read exactly the same. And I feel that even using BSFC is only going to tell you what your making at the crank. Although you could take that number and figure in drivetrain loss and get close too. Or figure out how many lb/min of air your engine is moving and again, figure in drivetrain loss for HP at the tires.
I think your best way to find out your power is like what 1slow01Z71, put it on a certified scale and then use your 1/4mi ET and MPH. No dyno is going to read exactly the same. And I feel that even using BSFC is only going to tell you what your making at the crank. Although you could take that number and figure in drivetrain loss and get close too. Or figure out how many lb/min of air your engine is moving and again, figure in drivetrain loss for HP at the tires.
#340
Joined: Jan 2006
Posts: 16,282
Likes: 438
From: Huntsville, AL
What you could do is make a graph similiar to how I did with dyn cyl air and what you rear wheel torque was from the dyno if you can get it close via rpm and looking at your hpt log.

With that you can make a PID that shows you what your calculated rear wheel horsepower is. The correlation is very linear so it should be pretty accurate.
With that, what you can do is go to the track and and with your trap speed, find another real horsepower value. Ideally they will be very similar, but if they are not, you could make a weight average equation that would put you somewhere in the middle.

With that you can make a PID that shows you what your calculated rear wheel horsepower is. The correlation is very linear so it should be pretty accurate.
With that, what you can do is go to the track and and with your trap speed, find another real horsepower value. Ideally they will be very similar, but if they are not, you could make a weight average equation that would put you somewhere in the middle.






