I have my car on a mustang dyno and it went to 437hp. Post by xtreme872 » Tue Mar 18, 2008 6:21 pm. to aid you in configuring your vehicle to get the most out of it. This conversion utility was jointly developed between Is it just me or do people really believe the … Jump to Latest Follow 41 - 55 of 55 Posts. With that combo the car ran 11.99 @ 118, works out to about 380 rwhp, but that was an awesome mineshaft air day. You would think 20% loss, but that is not true. With 1,000 rwhp painful close, he decided to push his luck and was rewarded with 993 ponies at the tire. If you want to split the diff use .825 in the equations which would be 18.5% loss. 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. Everything I've seen matches up with 12% manual and about 15% auto but every car is a little different. True HP as compared to DJHP It's not possible to give an absolute conversion factor, as it appears that dj dynos don't all read the same (my experience, other's, too - and Mag Articles and 2002 Roadracing World gsxr1000 and R1 comparison articles), but, you can take True HP from EC997's and produce an "average" djhp of of an "average" dj dyno - empirically derived, over 20 … WHP (RWHP) is the measure you would get on a standard dyno, the power that actually reaches the wheels. Thread starter ttemp05; Start date Jun 11, 2005; 1; 2; Next. Don't forget that each dyno, type of smoothing, gearing etc (and even the operator) can have a significant impact on the final numbers. Thanks :wink: Alex 2001.5 Nogaro Blue S4, 6-Speed, mods o'plenty. A forum community dedicated to Ford Mustang owners and enthusiasts. RWHP is less than crank hp, and rwhp is what you will actually see at the ground.. on mustangs there is about a 15% hp loss through the driveline from the crank to the rear wheels C5 Z06 Specific Topics. Anyone got a good formula for the loss of hp throught drivetrain. i think 20% loss for an automatic is too high. Crank numbers are the HP and Torque values as measured at the engine. You are bound to have stumbled upon the term Horsepower, whether you own a vehicle or not. 74 Posts ... Walbro 255LPH High pressure fuel pump, Kirban performance Adjustable fuel Pressure Regulator, a9l ECU/MSD 6AL Ignition Box. HP vs BHP. www.mk5cortinaestate.co.uk 270 chp - 15% = 40.5 hp lost = 229.5 whp 380 chp - 15% = 57 hp lost = 323 whp 450 chp - 15% = 67.5 hp … Prev. Alright, I am still confused about the … If you take the 630 (whp) x 1.12 (+12% drivetrain loss) you get close to the 707 crank … 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. Hey I was wondering what (if there even is) some kind of percentage you can use to determine crank hp to rwhp. Can someone just tell me what's needed to do the calculations? 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. Source(s): www.xowey.com gm tech 7 years ase master with L1 A dyno will read WHP. (A flywheel is a disc with teeth on it. Many simple use 15% (manual) and 20% (auto), and while convienent, that does tend to slightly over estimate crank horsepower. 340hp at the wheels is good, really good for a small motor. Is it the same across the board? 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). BUT given the current discussion, your 139.8 mph and your 740 rwhp (ie. Quoted HP vs. RWHP and My old '03 Mach 1 put 277 to the wheels, and it could run 12.9's @ 106, at a 3450 race weight. All engine powered accessories such as AC compressor, power steering, alternator, and sometimes even the water pump are removed from the engine for testing. I remember someone talking about this a while back, but don't remember now just what exactly the results were...MSO stated 161.7 HP at the crank and (before break in 140 HP after 4000 miles 145 RWHP). (simple way of explaining, really much more complicated). Take 16 hp for J1341, 6 hp for the water pump, and 25 (estimate) for the exhaust and the percent drop is approximately 8.5. is not in any way affiliated with. This time around, he made just north of 900 rwhp before he realized he was again running out of fuel system. The Ford Performance tune for the 2.3L Ranger gets you 315 crank hp with a warranty, and that's conservative. The 401 made 444 hp at the flywheel and 354 rwhp. ?, whp = wheel horsepower, rwhp = rear wheel horsepower. Discussion Starter • #1 • May 6, 2008. 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. Do most dealers/vendors list their products by RWHP or crank HP? Typically automatics run about 6% percent greater loss than the manuals. That might be true but technically if you no matter what get 15% drive train loss and you up the hp, technically the difference between crank hp and wheel hp grows bigger. 1. HP vs RWHP. So if you make 100 HP at the crank and have 10% drivetrain loss, you'd make 90 hp at the wheels. I've heard the auto on thew 05+ was more along the lines of 17% but it really isn't that big of a difference. For 2005+ Mustangs a very good "estimate" is 12.5% Manual loss and 19% Automatic loss. 422 Posts . I figured 500ish, but just curious. Searched (obvioulsy) but just couldn't find that formula to calculate RWHP to crank HP and vice versa. I remember seeing something on a site where they were calculating actual HP from rear wheel HP by dividing the RWHP by 0.85 (which would account for the 15% loss). This, however, was the straw that broke the camel’s back. 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. FrozenMist hp is measured at flywheel all others are on a dyno. 253hp at the crank This conversion utility was jointly developed between FrozenMist and www.mk5cortinaestate.co.uk to aid you in configuring your vehicle to get the most out of it. WTH is up with folks who quote crank hp knowing your talking RWHP. … HP is a measurement which is used during ads for cars, and it’s also something that you will often hear being used by those who work in machine shops, or even men who are car enthusiasts, but what about the term Brake Horsepower, or BHP? To see these values, an engine must be connected to an engine dynamometer (dyno for short). For a better experience, please enable JavaScript in your browser before proceeding. Discussion Starter • #1 • Aug 11, 2005. 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. The WHP is the HP the motor makes after you factor in drivetrain loss. Brake Horse Power (bhp) This is the power output of any engine measured at the engine's flywheel. 168 Posts . SOme include geraring, condition of lubricants, mass of rotating parts, manual or automatci transmission and a few others. There is no magic formula, because there are just too many variables. wheel horsepower (whp) vs. crank horsepower (bhp) Stock (average) Hellcats dyno around 630 (whp) from what I have gathered from the forums. Say it's like 455rwhp, what would that be in crank hp? Depending upon your entire combination, your 340rwhp could be anywhere between 390 and 460 hp at the crank. Hell I own a Challenger tool box, not a pony car,lol. around 865 fwhp) wouldn't seem like enough to make 4400 lbs reach 140 mph in a 1/4 mile, given Tony's experience and the Moroso calculator all indicating you'd need at least 900 fwhp...so I'm officially confused. ARD … +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. The idea of a turbocharged body-on-frame SUV with a manual transmission excites me a lot more than the trivial displacement difference … Ever run into this:::Folks who quote Crank Hp vs RWHP. HP is measured at the flywheel, BHP is very similar but many other things are attached to the engine which tries to measure loss of HP from attachments after the flywheel. RWHP vs. crank hp. hp = horsepower, bhp = brake horsepower, ps = power steering?? Its 4x4 pull truck with manual transmission, transfer case, 4.56 gears and 1 … JavaScript is disabled. More practically speaking, RWHP for a given car is usually between 15% and 20% lower than SAE net HP, typically about 17%. :scratchhead: Are they that stupid they think you don't know what is up. RWHP = .85 x HP HP = RWHP / .85 or 20% loss from flywheel to rear wheels RWHP = .80 x HP HP = RWHP / .80 Some people use 15% and some use 20%. Hope that helps. C5 Z06 - Grandstand. 242 Posts . Discussion Starter • #1 • Nov 2, 2008. I have dynoed on a chassis dyno. Alright, I am still confused about the difference between these. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! Like Kyle F said.......generally a 15% drivetrain loss. There is WHP (HP at the wheels) and Crank HP (Actual HP the engine itself makes).
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