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The Pub For General Automotive Related Talk |
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#1 | ||
Turbo Falcon Fiend
Join Date: May 2005
Location: Far West NSW
Posts: 3,205
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Hi Folks,
As the title says, does anyone have any tips for deducing an approximate value for flywheel power from rear wheel power? My car has made 162rwkw on a dyno. If I allow for the automatic trans, the differential and any other sources of friction, drag, heat etc..... What would an approximate value be for flywheel kilowatts?
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Too many turbo toys...... 2009 FG F6 Nitro LPI LPG 290rwkw on LPG. 2005 BAMKII XR6 Turbo with LPG (ex HWP 255,000k's and counting) Honda 2001 CR500E Road registered CR500 Honda 1985 CR500 (the one with the arm ripping power) DT200r regoed Hack Yamaha IT/YZ 465 Vinduro rocket Imported IT465 and 490 back up bikes VF1000R mid 80's racer built by HMR Honda CR480 Air cooled project road cafe racer. T88 Turbo XT Falcon project with 351 Cleveland (mothballed) Plus the rest. . |
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#2 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Canberra Region
Posts: 8,943
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About 210-220kw. All dynos are different and so are the operators so theres never an accurate figure that can be agreed apon.
But a generally accepted figure is to multiply the rwkw by 1.3 or so to get you flywheel power. A better guide is actually a 1/4mile, in particular the mph.
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2016 FGX XR8 Sprint, 6speed manual, Kinetic Blue #170 2004 BA wagon RTV project. 1998 EL XR8, Auto, Hot Chilli Red 1993 ED XR6, 5speed, Polynesian Green. 1 of 329. Retired 1968 XT Falcon 500 wagon, 3 on the tree, 3.6L. Patina project. |
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#3 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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I have been told by a guy that owns a engine dyno as well as a chassis dyno, the difference on a late model car is about 22%
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#4 | ||
Turbine Power
Join Date: Feb 2005
Location: Wagga Wagga
Posts: 120
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it tends to work out that rear wheel HP equars Flywheel KW. Not gospel but a good guide.
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#5 | ||
LPG > You
Join Date: Dec 2004
Location: Sydney, NSW, Australia
Posts: 4,277
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It isn't possible to calculate that accurately. Or anything approaching accurate.
The most general guide would be 18-20% loss manual, 20-22% loss auto, RWD. However, DynoDynamics Dynamometers (and in general, dynos & operators in this country) don't follow this, as they have silly software that adjusts the readings to what it believes (or is programmed to believe) is correct. That's a pretty poor system, there should never be any correction factor, especially attempting to "adjust" for variables like humidity, air temp, traction.. yadda yadda yadda. PS- I'm well aware people will attempt to flame me for the above post, and I'm well prepared for it.
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LPG Lovers Association President & Member #1. ![]() ![]() |
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#6 | |||
LPG > You
Join Date: Dec 2004
Location: Sydney, NSW, Australia
Posts: 4,277
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Quote:
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LPG Lovers Association President & Member #1. ![]() ![]() |
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#7 | ||
Only a matter of time.
Join Date: Apr 2006
Location: Melbourne
Posts: 1,127
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I just go 25%
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"SOUNDS THAT GO BUMP IN THE NIGHT" |
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#8 | ||
torque is your friend
Join Date: Jan 2005
Posts: 667
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This has been discussed heaps of times before. You CAN'T calculate drive train loss across the board using a % figure. Each drivetrain will have a fixed kw loss regardless of what engine is powering it. A 25% loss of a 180fwkw engine is 45kw through the drivetrain. Turbocharge that same engine to get a 300fwkw figure and apply the same 25% loss theory and you have a 75kw loss through the very same drivetrain. Impossible.
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Support Cystic Fibrosis Australia Learn about it here, donate and help the research into finding a cure and to provide services for children living with CF and their families. |
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#9 | |||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Canberra Region
Posts: 8,943
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Quote:
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2016 FGX XR8 Sprint, 6speed manual, Kinetic Blue #170 2004 BA wagon RTV project. 1998 EL XR8, Auto, Hot Chilli Red 1993 ED XR6, 5speed, Polynesian Green. 1 of 329. Retired 1968 XT Falcon 500 wagon, 3 on the tree, 3.6L. Patina project. |
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#10 | ||
Only a matter of time.
Join Date: Apr 2006
Location: Melbourne
Posts: 1,127
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Theres a fraction to much friction
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"SOUNDS THAT GO BUMP IN THE NIGHT" |
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#11 | |||
Bring on the lion...
Join Date: Nov 2005
Posts: 974
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Quote:
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El falcon, 4.0, XR6 camshaft, pacemaker extractors, 2.5 inch exhaust with tri flow sports muffler, AU TE50 intake, with K&N panel filter, Advanti racing Stalker 17" rims, Sitting on Ultra Low King Springs, 'Gabriel' Ultras Lowered struts, NOW MANUAL, 3.45 LSD 9.694 @ 75.38 MPH at Mildura Drag Strip 1/8 Mile XC Falcon project car underway...... |
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#12 | |||
torque is your friend
Join Date: Jan 2005
Posts: 667
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Quote:
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Support Cystic Fibrosis Australia Learn about it here, donate and help the research into finding a cure and to provide services for children living with CF and their families. |
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#13 | |||
Weezland
Join Date: Aug 2005
Location: Sydney,workshop mod
Posts: 7,216
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Quote:
We still get varying numbers from one time to another,the biggest difference highest to lowest was over 60hp. I dont put much faith in em,just tune the car and thats it. Although they can give a rough guide.. |
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#14 | |||
LPG > You
Join Date: Dec 2004
Location: Sydney, NSW, Australia
Posts: 4,277
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Quote:
The best guide to know how well your car's performing is to take it to the track and give it a run. If you really want to know how much power your engine has (and can afford it), take it out and send it to a proper engine dyno. Power figures from chassis dyno's are close to useless. Ask any 1000rwhp Supra owner from the US who runs 12.5 @ 135mph about it....
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