When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
we can do some simple calculations to measure our brake horsepower and from there whp. I use -15% for my RWD car 996 TTS, and 22% or so for AWD cars.
On this 30-130 mph run I measured 3 points at near peak Longitudinal acceleration near gear change points to get an idea of my car's power. Based on this run which resulted in a 7.219 second 60 to 130 mph, the calculations seem spot on.
That gave me 3 points to use which I put into a spreadsheet with the basic calculations
Turbo S RWD with K24s, temp = 92F
Power test run 30 to 130 mph
very instructive Andrew thx for sharing! only downside that will alter this formula is wind velocity !but not sure if % slope can change thing !logicaly no
It is a good approximate, much like a real world dyno is a good approximate because they can be readily manipulated. I like this better because after 4 or 5 runs you really narrow down an exact range... my car is 530-570 rwhp or about 540 on average runs
Last edited by wolfhedge; Sep 16, 2014 at 01:28 PM.
i never dynoed my car cuz it is all relative from 5-25% if you compare with your mates and easy to make some BS and marketing stuff IMO... but they are honest tuner out there who need accurate data and need a dyno as a tool in there shop !but for us user the best dyno is the vbox 1/4 mile trap speed and 60-130 it don't lie and cost 400$ (same price for 3hr dyno tune session)
Yes mate and if you use the datalogging from Eurodyne or even Durametric you can just do a log and measure your load% at certain rpms and speed and measure the horsepower from that, I get very accurate readings
