Landracing Forum

Tech Information => Technical Discussion => Topic started by: Jeremy Blaze on March 12, 2008, 09:53:57 AM

Title: How much HP for 81 camaro?
Post by: Jeremy Blaze on March 12, 2008, 09:53:57 AM

  How much hp will I need to push a stock body 1981 camaro to 160mph, 175mph 200mph?

 

Title: Re: How much HP for 81 camaro?
Post by: maguromic on March 12, 2008, 10:31:09 AM

I would think you would need about 800hp or more to go 200. That car is not too aero friendly. If you haven't bought a body think of a monza.

Title: Re: How much HP for 81 camaro?
Post by: Sumner on March 12, 2008, 11:38:06 AM

Quote from: maguromic on March 12, 2008, 10:31:09 AM

I would think you would need about 800hp or more to go 200. That car is not too aero friendly. If you haven't bought a body think of a monza.

Well why we are guessing I'll guess about 589 RWHP to go 200 (that is using a Cd of .40 and frontal area of 27 square feet and I don't know if those are close or not) and if that was the case then you would need 395 to run 175 and 302 to run 160.  These would be "honest" RWHP.  589 RWHP would probably be around 725-750 HP at the crank , so I guess we are both probably guessing about the same.

There are spreadsheets where you can easily figure all of this and more here................

http://purplesagetradingpost.com/sumner/bvillecar/bville-spreadsheet-index.html

c ya,

Sum

Title: Re: How much HP for 81 camaro?
Post by: Jonny Hotnuts on March 12, 2008, 11:51:38 AM

Quote

These would be "honest" RWHP.  589 RWHP would probably be around 725-750 HP at the crank , so I guess we are both probably guessing about the same.

Remember your "honest" RWHP at Bonneville is not the same as your RWHP on a 55 degree day at 100' over sea level.
I hear you will loose about 10+% because of the altitude and temp if running NA.

-JH

Title: Re: How much HP for 81 camaro?
Post by: wolcottjl on March 12, 2008, 10:45:38 PM

You could work with this - The SO-AL camero did 244 with 820 Honest HP according to the article in Hot Rod Magazine.  This was a 1983 model with quite a bit of aerodynamic work and some wind tunnel time.  IIRC it has a really low CD .2 something.  You could back into the numbers to get what you need with a stock body. 

Title: Re: How much HP for 81 camaro?
Post by: dickj on March 19, 2008, 05:48:07 PM

540 flywheel HP pushed my 1977 Firebird to 160 in a mile.  I would think it would be almost the same for a Camaro.  DickJ In East Texas

Title: Re: How much HP for 81 camaro?
Post by: revolutionary on March 26, 2008, 08:56:03 AM

If my memory is right then I think the formula goes something like (new mph/known mph)^3 x known HP = new HP.

So if the 77 Bird has accurate numbers then...

(175/160)^3 x 540 = 706hp

(200/160)^3 x 540 = 1054hp

Someone correct me if I got it wrong.

Of course those numbers would be for the mile and not a 5 miler that would require much less hp.

Title: Re: How much HP for 81 camaro?
Post by: Sumner on March 26, 2008, 11:55:27 AM

Quote from: revolutionary on March 26, 2008, 08:56:03 AM

If my memory is right then I think the formula goes something like (new mph/known mph)^3 x known HP = new HP.

So if the 77 Bird has accurate numbers then...

(175/160)^3 x 540 = 706hp

(200/160)^3 x 540 = 1054hp

Someone correct me if I got it wrong.

Of course those numbers would be for the mile and not a 5 miler that would require much less hp.

Your numbers are right, but like you said had the car reached it potential with the HP it had?  I'll bet it could run in at least the high 180's on the salt with the right gearing and that HP.  That would then change the HP to run the 200.

c ya,

Sum