Go Back   Club Lexus Forums > Lexus Model Forums > IS Models > IS F
Sign in using an external account
Register Forgot Password?

The effect of wheel weight on Dyno runs

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 07-28-14, 02:14 PM   #1
4everkidd
Lead Lap
Trader Score: (1)
 
Join Date: Mar 2011
Location: Alberta
Posts: 479
Default The effect of wheel weight on Dyno runs

From another forum, and one of my local shops.

Test:
Davenport Motorsports (www.davenportmotorsports.com) of Canada, wanted to see the dyno effects of running different wheels on cars. They took a factory 2012 Camaro SS and ran 3 dyno runs. They ran the first run with a set of aftermarket wheels, the 2nd run with a set of stock factory wheels and the 3rd run with a set of HRE P45S wheels, all in 20” sizes.

These results highlight the effects of rotational inertia on drive-train losses (the hp lost between the engine crank and the ground). Wheels and tires contribute to drive-train losses as energy is used to spin up the wheels (and decelerate the wheels under braking). From the dyno chart you can see the effect of replacing factory wheels with lighter HRE wheels and see the negative effects of installing heavier aftermarket wheels.

Results:
1. (Blue curve) Factory wheels: 20”x9.0” with Pirelli 275/40-20 tires weighing 68 lbs combined per rear wheel. – Max hp: 371 hp, Max Torque: 375 ftlbs - (Baseline)
2. (Red curve) Aftermarket wheels: 20”x9.0” with Pirelli 275/40-20 tires weighing 72 lbs combined per rear wheel – Max hp: 369 hp, Max Torque: 373 ftlbs - (A [-] loss of 2 hp and 2 ftlbs)
3. (Green curve) HRE wheels: 20”x11.0” with Nitto 315/35-20 tires weighing 60 lbs combined per rear wheel – Max hp: 380hp, Max Torque: 384 ftlbs - (A [+] gain of 8 hp and 9 ftlbs and that is running a 2” wider wheel/tire combo)

Conclusion:
The engine obviously still cranks out the same amount of hp and torque, the lighter HREs simply waste less of it before it gets to the ground. Also interesting to note is that the gains are not just peak gains, but gains across the entire rev range. If they had done a braking test, we would have seen similar results as the rotational inertia effects also have a significant effect on how much energy is used to stop the wheel/tire combo vs. stopping the car. We talk about these effects all the time and focus on designing lightweight wheels with low rotational inertia, but it isn’t every day that you get to see real hard data showing the true effects.


Click the image to open in full size.



Click this bar to view the full image.


Dyno Run - Effects of wheel/tire weights on wheel horsepower by HRE Wheels, on Flickr
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
4everkidd is offline   Reply With Quote
Old 07-28-14, 02:21 PM   #2
joshhleee
Lead Lap
Trader Score: (5)
 
Join Date: Oct 2011
Location: CA
Posts: 646
joshhleee
Default

cool.. you can also tell when driving that the car responds quicker and feels lighter. Went from heavy replica wheels to legit Ray te37..
__________________
2010 LEXUS IS-F SGM --Joe-Z Exhaust, PPE Headers,HPS Intake, , ISS Forged Intake Scoops, Tom's Drop in Filter,VOLK Te37, KWv3, Bridgestone Re-11, CF Flat Bottom Steering Wheel, Tom's Diffuser, iJDMtoy interior lights, f-sport ****, V-LED 5k fogs, 2011 headlights, lexon cf lip, wald spoiler, cf roof spoiler, mugen lugs.. etc...
joshhleee is offline   Reply With Quote
Old 07-28-14, 02:39 PM   #3
I8ABMR
Lexus Fanatic
Trader Score: (0)
 
I8ABMR's Avatar
 
Join Date: Sep 2007
Location: Somewhere far far away
Posts: 18,937
Default

old info but very cool to see it quantified like this. Thanks buddy for taking the time
__________________

2010 LEXUS ISF
FEATURES:
2007 GS350

Readers Rides of the month Modified Magazine December 2009
Readers Rides Super Street Magazine June 2010

2003 INFINITI G35 Rearders Rides Super Street Magazine 7/05
2007 Lexus GS350 / 2007 Lexus LS460 / 2010 Lexus ISF
I8ABMR is offline   Reply With Quote
Old 07-29-14, 04:27 AM   #4
Defratos
Lead Lap
Trader Score: (0)
 
Defratos's Avatar
 
Join Date: Oct 2011
Location: On a sand dune
Posts: 690
Default

nice to see this info tested on a dyno, thanks for sharing
__________________
2013 IS-F | Mercury Grey (1H9) | Red Leather Interior | PPE Headers | Tints | 3M Protective Film | Gloss Black Exhaust Tips | CF/ Flat bottom Steering wheel | PC'd Callipers | Project Mu pads | Black Pearl Emblems | Black Grille Surround | Joe-Z Intake | aFe Filter | Apexi TC | http://www.clublexus.com/forums/is-f...isf-build.html
Defratos is offline   Reply With Quote
Old 07-29-14, 04:49 AM   #5
Lets Drive
Lexus Test Driver
Trader Score: (3)
 
Lets Drive's Avatar
 
Join Date: Mar 2006
Location: MD
Posts: 1,198
Default

Nice post, every bit helps. I believe I saw a test like this with rotors, too.
__________________
2010 Starfire Pearl IS F

Joe Z intake|PPE headers|Borla cat-back|Figs 2-piece rotors w/1521 pads & LCA bushings|BC coilovers w/Swift springs (16/12k)|F-Sport rear sway bar|Volk G25 wheels (F:19x8.5 R:19x9.5) w/Michelin PSS (F:235-40 R:265-35)|Braille GU1R 6.6 lb battery|OEM 2012 headlights & steering ECU + 2014 LED fog lights & CF spoiler + deletions - Total weight savings: 185.7 lbs
Lets Drive is offline   Reply With Quote
Old 07-29-14, 04:49 AM
 
 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Review: 2014 Mini Cooper S Hoovey2411 Car Chat 12 07-02-14 10:07 PM
Dyno Comparisons: K&N Typhoon Intake vs Stock vs DIY Flap Mod Supraman16 IS F 61 06-16-14 01:40 PM
Don't be swayed by HP figures....Torque is what really counts. mmarshall Car Chat 97 05-04-14 04:10 AM
Injen MR Short Ram Air Intake Install! Matt_RN CT 200h Model 61 02-08-13 01:33 AM
First Drive: 2013 Porsche 911 Carrera 4S Hoovey2411 Car Chat 4 11-12-12 08:39 PM

All times are GMT -7. The time now is 01:05 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info