Performance Calculators
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Senior User
Joined: Nov 2000
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From: Calgary
Performance Calculators
Anybody ever use those 1/4 mile time/trapspeed/vehicle weight/hp calculators? There kind of driving me nuts! I'm trying to find my fwhp/rwhp without actually dyno testing the truck.
The variables I know are:
-weight
-1/4 time
-trap speed
Using the online calculators I'm coming up with ridiculously low hp numbers. The one that I can adjust for is altitude, assuming the times given @ are sea level, which I'm at 3500ft. The other factor it doesn't account for is co-efficient of drag loss.
I'm coming up with 310fwhp and 265rwhp. Which is quite pathetic. DD puts me at 413fwhp.
The variables I know are:
-weight
-1/4 time
-trap speed
Using the online calculators I'm coming up with ridiculously low hp numbers. The one that I can adjust for is altitude, assuming the times given @ are sea level, which I'm at 3500ft. The other factor it doesn't account for is co-efficient of drag loss.
I'm coming up with 310fwhp and 265rwhp. Which is quite pathetic. DD puts me at 413fwhp.
Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
I figure more like 25-30% for the auto tranny's. The dyno operator agreed. As a refernce mine posted 360 RWHP on a chassi dyno.
To DD's credit, it accuratley predicted where my HP would peak. So, if it's HP estimate is as accurate, I think DD showed mine is between 450-500 FWHP. That's a lot more than 17% difference. More like 25%.
To DD's credit, it accuratley predicted where my HP would peak. So, if it's HP estimate is as accurate, I think DD showed mine is between 450-500 FWHP. That's a lot more than 17% difference. More like 25%.
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Senior User
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From: Calgary
Found this site.
http://www.prestage.com/Car+Math/default.aspx
1/4 time: 14.69 @ 3500ft
trap speed: 92mph
weight: 3950lbs
Corrected, I'm at 14.06@96mph. That gives me 277hp at the wheels. Nasty. 15% drivetrain loss is 320fwhp or 25% for the C6 gives me 370. Nasty.
http://www.prestage.com/Car+Math/default.aspx
1/4 time: 14.69 @ 3500ft
trap speed: 92mph
weight: 3950lbs
Corrected, I'm at 14.06@96mph. That gives me 277hp at the wheels. Nasty. 15% drivetrain loss is 320fwhp or 25% for the C6 gives me 370. Nasty.
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Senior User
Joined: Nov 2000
Posts: 366
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From: Calgary
2800 B&M stall.
Even a 99 Lightning comes out to 309rwhp, which sounds about right.
Just goes to show that all the go-fast goodies doesn't always cut it. Guess some blue-printing is required to get some efficiency. I was looking for atleast 1hp/ci.
Is anybody else getting 1hp or better out of the 390?
Even a 99 Lightning comes out to 309rwhp, which sounds about right.
Just goes to show that all the go-fast goodies doesn't always cut it. Guess some blue-printing is required to get some efficiency. I was looking for atleast 1hp/ci.
Is anybody else getting 1hp or better out of the 390?
Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
Originally Posted by *************
Already have large tube blackjack headers and dynomax mufflers. The 2-1/4" exhaust just slipped my mind when I had the shop do them 10 years ago.
put some cut-outs in just behind the headers, keep the rest. Should be fine.
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