Flywheel & Rear wheel kW difference - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 34 (permalink) Old 05-06-03, 06:20 PM Thread Starter
AKA: Spaniard
 
VH-PBC's Avatar
 
Join Date: Mar 2003
Location: Western Suburbs, Melb., VIC
Age: 31
Posts: 848
frown Flywheel & Rear wheel kW difference

I wanted to know if there is a formula or somewhat near that I can use to calculate the difference between the two.

Depending on what car the test is on will depend on the difference because of the mechanics of everything between the motor and the wheels

Factory figures come from the flywheel but figures from shops and many dynos are from the wheels.

Can anyone help?

Peter

No car ATM but I am looking at one...
I don't want to say which one otherwise someone else might buy it!
VH-PBC is offline  
Sponsored Links
Advertisement
 
post #2 of 34 (permalink) Old 05-06-03, 06:55 PM
Lamahs approve of manuals
 
Join Date: Mar 2003
Location: Sydney, Australia
Age: 38
Posts: 1,382
I certainly don't know of an exact formula, but I think (someone correct me pls), that you generally reckon on losing 25% or so between the motor and wheels, usually a little more in an auto.

Like you said, every car / model is different, and I can't really see how any formula could claim to have good accuracy ( better than the above guesstimate anyways ).

Beyond this, even on the same car, different dyno's will produce wildly varying results anyway.

What are you trying to get from the formula ( I'd guess you want to know flywheel KW's after a mod ? ). Generally I'd say ( I think most ppl here would agree ), forget about the factory flywheel figure, and go with the dyno results, factory figures are good for impressing mates at the pub, but rwkw's will be what smokes that hsv at the lights :)
XR8 Lamah is offline  
post #3 of 34 (permalink) Old 05-06-03, 11:39 PM Thread Starter
AKA: Spaniard
 
VH-PBC's Avatar
 
Join Date: Mar 2003
Location: Western Suburbs, Melb., VIC
Age: 31
Posts: 848
I did want to find out the flywheel kW after a mod because then you can brag about that . But around the know-it-alls you talk about the actually figures, the end product is, the raw wattage.

No car ATM but I am looking at one...
I don't want to say which one otherwise someone else might buy it!
VH-PBC is offline  
post #4 of 34 (permalink) Old 05-07-03, 05:01 AM
Ford Veteran
 
gmanEA's Avatar
 
Join Date: May 2002
Location: Melbourne
Posts: 685
Good rule of thumb is flywheel kW is approx:
rwkw x 1.33
gmanEA is offline  
post #5 of 34 (permalink) Old 05-07-03, 07:53 AM
Registered User
 
Join Date: Aug 2002
Posts: 29
There is no real accurate way other than putting the motor on an engine dyno .
Some work off 30% loss but this is bullshit , If you had a 600 hp motor that means you would lose 200 hp through the drivetrain which = 149000 watts of energy , The drivetrain would melt with this amount of energy being absorbed into it .

But a simple one to use that some work off is RWHP = FWKW
TA22-3SGTE is offline  
post #6 of 34 (permalink) Old 05-07-03, 08:08 AM
Bourbon powered V8
 
JC-XR8's Avatar
 
Join Date: Sep 2002
Location: Canberra, Australia.
Posts: 4,787
Correct. RWHP = FWKW (approx) .The conversion is roughly the formula posted previously (RWKW * 1.33).

For a manual, you could work on around 20-25% loss as a rough figure. For an auto, it's more like 30-35%. Both of these are roughly the same as RWHP = RWKW.

__________________________


AU1 XR8 Auto 147.9 rwkw (approx 215 fwkw)

AU2 Wagon HAD Auto
17s, Pacemakers, 3" Intake & Pod filter (The Family Hack)

Member of:
FPV-XR Club ACT
AUFalcon.com
ATPS (honorary)
JC-XR8 is offline  
post #7 of 34 (permalink) Old 05-08-03, 02:44 AM
Falcontastic.
 
Join Date: Jun 2002
Location: Bendigo,Victoria.
Age: 39
Posts: 6,039
Quote:
Originally posted by JCV8
Correct. RWHP = FWKW (approx) .The conversion is roughly the formula posted previously (RWKW * 1.33).

For a manual, you could work on around 20-25% loss as a rough figure. For an auto, it's more like 30-35%. Both of these are roughly the same as RWHP = RWKW.
Well going by that theory I come to 190KW(front) for mine,you sure about that.and that's after the mod's.

AU II XR8
Herrod mod's,mmmn.
XW Wagon 221-2V,
Laser a maser.
galaxy xr8 is offline  
post #8 of 34 (permalink) Old 05-08-03, 03:53 AM
Are we there yet?
 
Join Date: Dec 2002
Location: SA - The Drift State
Age: 32
Posts: 1,621
What power readout do u actually have?

95 EF Fairmont 5.0 - Heritage Green - 4 Speed auto with AU S5 - 3.23LSD - 17x8" LWT Wheels - King Superlows - 76mm Cobra MAF - 65mm throttle - BPT Underdrive Pulley Kit - 3" Mandrel-bent Lukey exhaust - Tinted Windows - MP3 CD player - White faced dials.

117rwKw - 15.47@89.9MPH
Aaron_EF8 is offline  
post #9 of 34 (permalink) Old 05-08-03, 04:47 AM
Lamahs approve of manuals
 
Join Date: Mar 2003
Location: Sydney, Australia
Age: 38
Posts: 1,382
And what car / mods
XR8 Lamah is offline  
post #10 of 34 (permalink) Old 05-08-03, 05:16 AM
Falcontastic.
 
Join Date: Jun 2002
Location: Bendigo,Victoria.
Age: 39
Posts: 6,039
Quote:
Originally posted by Aaron_M
What power readout do u actually have?
Are you asking me,if so I have 142rwkw.

AU II XR8
Herrod mod's,mmmn.
XW Wagon 221-2V,
Laser a maser.
galaxy xr8 is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Trans | Driveline
Gear in this thread - Powered by O'Reilly Auto Parts


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
BA Falcon Interior Reveal RPO83 Ford Worldwide News 5 09-16-03 07:12 PM
Holden AWD SSX FPRXR-6 The Pub 52 10-17-02 04:57 PM
EAs stock rear wheel power Westkoast EA E-Series Falcons 5 05-27-02 10:55 PM
2000 V6 bad rear wheel bearings?? zaks00 Suspension | Wheels&Tires | Brakes 0 12-12-01 06:08 PM
Front Wheel vs Rear Wheel Drive 89ProbeGirlie The Pub 20 10-10-01 03:25 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome