For a better experience, please enable JavaScript in your browser before proceeding. SOme include geraring, condition of lubricants, mass of rotating parts, manual or automatci transmission and a few others. 340hp at the wheels is good, really good for a small motor. to aid you in configuring your vehicle to get the most out of it. Searched (obvioulsy) but just couldn't find that formula to calculate RWHP to crank HP and vice versa. Dyno number really should only be used as a baseline for YOUR car in determining performance gains from upgrades and NOT to compare it to other cars (ie; paper racing). Prev. Is it the same across the board? Typically automatics run about 6% percent greater loss than the manuals. Say it's like 455rwhp, what would that be in crank hp? Alright, I am still confused about the … Anyone got a good formula for the loss of hp throught drivetrain. My old '03 Mach 1 put 277 to the wheels, and it could run 12.9's @ 106, at a 3450 race weight. Many simple use 15% (manual) and 20% (auto), and while convienent, that does tend to slightly over estimate crank horsepower. This conversion utility was jointly developed between ?, whp = wheel horsepower, rwhp = rear wheel horsepower. Brake Horse Power (bhp) This is the power output of any engine measured at the engine's flywheel. 2008 Clash of the Titans World Finals Champion, 2009 Strictly Street Points leader/ET & MPH Record Holder, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada, is an independent enthusiast website owned and operated by Content on is generated by its users. For 2005+ Mustangs a very good "estimate" is 12.5% Manual loss and 19% Automatic loss. 1. hp is measured at flywheel all others are on a dyno. Discussion Starter • #1 • Aug 11, 2005. To see these values, an engine must be connected to an engine dynamometer (dyno for short). A buddy of mine has a new 5.0 and is getting all kind so goodies for it, one question came up with the Shelby since he is always comparing his car to mine :( and the question is the difference between Crank HP and RWHP. :scratchhead: Are they that stupid they think you don't know what is up. (A flywheel is a disc with teeth on it. With that combo the car ran 11.99 @ 118, works out to about 380 rwhp, but that was an awesome mineshaft air day. If you take the 630 (whp) x 1.12 (+12% drivetrain loss) you get close to the 707 crank … Hey I was wondering what (if there even is) some kind of percentage you can use to determine crank hp to rwhp. Ever run into this:::Folks who quote Crank Hp vs RWHP. With 1,000 rwhp painful close, he decided to push his luck and was rewarded with 993 ponies at the tire. This, however, was the straw that broke the camel’s back. To the best of our knowledge it provides a good quality of accuracy but we do advise that you should always double check your results to avoid any problems. +1 on the things said above, 12% loss manual 15% on autos approximately, but you also have to consider the stock numbers are approximate some cars get a good bit more and some a good bit less. 74 Posts ... Walbro 255LPH High pressure fuel pump, Kirban performance Adjustable fuel Pressure Regulator, a9l ECU/MSD 6AL Ignition Box. BUT given the current discussion, your 139.8 mph and your 740 rwhp (ie. Don't forget that each dyno, type of smoothing, gearing etc (and even the operator) can have a significant impact on the final numbers. Do most dealers/vendors list their products by RWHP or crank HP? We always welcome any advice/experience that people can give us to help us improve on these utilities so please contact either Mike or myself using the links below if you have any contributions. Jump to Latest Follow 41 - 55 of 55 Posts. Source(s): www.xowey.com gm tech 7 years ase master with L1 This time around, he made just north of 900 rwhp before he realized he was again running out of fuel system. WHP (RWHP) is the measure you would get on a standard dyno, the power that actually reaches the wheels. C5 Z06 Specific Topics. www.mk5cortinaestate.co.uk I have my car on a mustang dyno and it went to 437hp. I mean I know crank horsepower is just about the power the engine is creating at the crank and rwhp is the amount of hp actually.
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