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View Full Version : finding a realistic rear wheel hp number


grumpyvette
10-22-2013, 12:24 PM
grumpy, I can,t really find a local rear wheel dyno, I trust to not screw up my car (I,ve heard too many horror stories about busted engines) and I probably don,t want to spend the cash to get my car dyno tested, but Id like to know how much power the car puts out! Ive heard my engine combo puts out well over 450 fly wheel horse power but I have my doubts

finding a realistic rear wheel hp number?
theres lots of options but heres one I found fairly consistent
http://www.race-cars.net/calculators/et_calculator.html
if you know your cars actual weight with you sitting in it and your 1/4 mile trap speed , its a fairly accurate way to determine your true rear wheel horse power

(and don,t be too disappointed if you find your engine that you brag about that has ( 450-500 hp) has significantly less at the rear wheels)
and anything over 400 rear wheel hp in a street cars impressive

http://forum.grumpysperformance.com/viewtopic.php?f=69&t=9930

BuWaGone
10-23-2013, 12:40 AM
Cool, according to the calculator my 87 octane 327 made approx. 300 at the rear wheel. I figured about there. I wish I chassis dynode my 383 so I could have calculated my ET.

Dalejrfan
10-23-2013, 03:59 AM
Check out wallace dyno calculators. I think thats ut anyway they have alot and its fun. Those dyno runs are fun. :woott:

gbody-nut
10-29-2013, 07:07 AM
pretty close just put in mine was with in a tenth of what i ran.