Perth-WRX.com  

Go Back   Perth-WRX.com > Vendors and Sponsors > Kido Racing
Register Diddy Kart ArticlesAll AlbumsBlogs FAQ Members List Calendar Search Today's Posts Mark Forums Read


Welcome to Perth-WRX, click here to register!

Like Tree10Likes

Reply
 
LinkBack Thread Tools Display Modes
  #21  
Old 05-05-2012, 02:33 PM
XT_for_me's Avatar
DCCD Donut Driver
Member
 
Join Date: Jul 2011
Location: Sunbury, VIC
Posts: 75
Thanks: 0
Thanked 0 Times in 0 Posts
XT_for_me at standard level
Default

I took my Foz to a Dyno Day with the guys from Liberty.asn.au today and had a great time.

Here is a snap from my run.

__________________
KiDo Racing - your choice for coilovers and high performance brake kits

Because STOPPING is never optional.

http://www.perth-wrx.com/vb/kido-racing/

www.kido-racing.com.au
Reply With Quote
  #22  
Old 05-05-2012, 03:53 PM
jEstEr?'s Avatar
Insufficient registration
Member
 
Join Date: Jul 2005
Location: Perth-ish
Posts: 8,327
Thanks: 26
Thanked 64 Times in 47 Posts
jEstEr? knows their stuff
Default

671nm of torque?

__________________
MY93 Impreza GX 1.8L, 0hp, 0nm
Reply With Quote
  #23  
Old 05-05-2012, 04:00 PM
Dan [GTI]'s Avatar
Subaru Tech Division
Member
 
Join Date: Oct 2011
Location: [DISCLOSED]
Posts: 1,023
Thanks: 175
Thanked 63 Times in 60 Posts
Dan [GTI] knows their stuff
Default

Quote:
Originally Posted by jEstEr? View Post
671nm of torque?
If it seems to good to be true...
__________________
MY01 JDM EVO VII - 230KW / 430NM @ 1.6BAR
Reply With Quote
  #24  
Old 05-05-2012, 04:45 PM
XT_for_me's Avatar
DCCD Donut Driver
Member
 
Join Date: Jul 2011
Location: Sunbury, VIC
Posts: 75
Thanks: 0
Thanked 0 Times in 0 Posts
XT_for_me at standard level
Default

I got a laugh from it as well. The facts are that measuring engine torque on a dyno is never going to be realistic. If you want to know why there is an easy explanation. The torque figures you are used to seeing are measured on an engine dyno where direct torque measurements are easy to achieve and calibrate. Measuring torque at the wheel is likewise easy to do, and accurate. Where things fall apart is in the translation. The figure you see is a guesstimate of the engine torque based on the wheel torque readings, however the unknown factor in the equation is the gearing in the car.

Some theory..... In a static condition or almost so the torque fed into the gearbox is multiplied by the gear ratio. Same happens at the diff. So if for example the Foz generates 320nM (as quoted by Subaru in stock tune) then at the wheel we will measure engine x gear ratio x diff ratio which is 320x0.972x4.444=1382nM

Where the dyno read out falls over is that it does not know the gear ratios to do the reverse calculation. You may also notice that I have not mentioned drive train loss. In a static situation as described by the simple calculation above there is no loss, however at anything above 0 rpm of course the losses due to friction and inertia increase with speed.

Bottom line is that torque displays that try to emulate the flywheel output are not going to be very accurate.

Just to touch on the subject of power readings, I am sure you all know that some dynos read much higher or lower than others. It really doesn't matter when the dyno is used as intended, and that is as a back to back measure when adjusting a tune.

I am surprised that people want to mock something they clearly do not understand.
RUSSGT likes this.
__________________
KiDo Racing - your choice for coilovers and high performance brake kits

Because STOPPING is never optional.

http://www.perth-wrx.com/vb/kido-racing/

www.kido-racing.com.au
Reply With Quote
  #25  
Old 05-05-2012, 05:04 PM
STI325V6's Avatar
Sign me up!
Subaru Tech Division
 
Join Date: Jul 2005
Location: Perth, Darch
Posts: 1,932
Thanks: 15
Thanked 41 Times in 30 Posts
STI325V6 knows their stuff
Default

^^Thats PWRX for you!
Reply With Quote
  #26  
Old 05-05-2012, 05:12 PM
Sign me up!
Subaru Tech Division
 
Join Date: Sep 2009
Location: NOR
Posts: 1,614
Thanks: 2
Thanked 4 Times in 4 Posts
AJAYJAY at standard level
Default

Quote:
Originally Posted by STI325V6 View Post
^^Thats PWRX for you!
I second this
Reply With Quote
  #27  
Old 05-05-2012, 05:34 PM
GTB Liberty's Avatar
Perth WRX Old Skool Cool Dude
Member
 
Join Date: Jun 2009
Location: Mexico - sur del río en capa libre
Posts: 3,856
Thanks: 204
Thanked 140 Times in 92 Posts
GTB Liberty is a guruGTB Liberty is a guru
Default

I think that everyone "loves" a dyno fantasy figure ...
__________________
[COLOR=Black]Liberty GT Spec B tuned 240 HP & 372 Nm at the hubs.[/COLOR] "Instead of banning high performance cars - ban low performance drivers"
Reply With Quote
  #28  
Old 05-05-2012, 05:42 PM
Rossco's Avatar
Perth WRX Old Skool Cool Dude
Member
 
Join Date: Apr 2007
Location: Perf, NOR
Posts: 5,467
Blog Entries: 11
Thanks: 54
Thanked 100 Times in 79 Posts
Rossco is a guruRossco is a guru
Send a message via MSN to Rossco
Default

Dyno Dynamics Hub dynos reverse calculate the Torque, they also don't need to take into consideration the wheel diameter (and high rpm trye bloat) unlike roller dyno's.

It works provided the operator enters the correct diff ratio & the car is run in whatever gear is 1:1 (or the closest to it)....Oh and the IAT sensor isn't hanging on a wall!

Jester Understands this btw, hence his jest.
__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]
Reply With Quote
  #29  
Old 05-05-2012, 08:44 PM
XT_for_me's Avatar
DCCD Donut Driver
Member
 
Join Date: Jul 2011
Location: Sunbury, VIC
Posts: 75
Thanks: 0
Thanked 0 Times in 0 Posts
XT_for_me at standard level
Default

Quote:
Originally Posted by Rossco View Post
Dyno Dynamics Hub dynos reverse calculate the Torque, they also don't need to take into consideration the wheel diameter (and high rpm trye bloat) unlike roller dyno's.

It works provided the operator enters the correct diff ratio & the car is run in whatever gear is 1:1 (or the closest to it)....Oh and the IAT sensor isn't hanging on a wall!

Jester Understands this btw, hence his jest.
True.
I forgot to mention the effect of tyre diameter. The IAT wont affect the torque reading displayed but can be a useful part of the tuning equipment in the right hands.
__________________
KiDo Racing - your choice for coilovers and high performance brake kits

Because STOPPING is never optional.

http://www.perth-wrx.com/vb/kido-racing/

www.kido-racing.com.au
Reply With Quote
  #30  
Old 05-05-2012, 09:09 PM
Rossco's Avatar
Perth WRX Old Skool Cool Dude
Member
 
Join Date: Apr 2007
Location: Perf, NOR
Posts: 5,467
Blog Entries: 11
Thanks: 54
Thanked 100 Times in 79 Posts
Rossco is a guruRossco is a guru
Send a message via MSN to Rossco
Default

a false IAT throws out the SAE power corrections.
__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]
Reply With Quote
Reply

Tags
kido, talk, tunes, tuning

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
KiDo Racing High Performance Brake Kits - Fitting and prices XT_for_me Kido Racing 46 15-10-2012 02:20 PM
Hello from Kido Racing! XT_for_me Introductions 6 04-08-2011 09:29 PM
Tuning Classes (PM only) mao Evolution R 1 11-06-2011 11:53 PM
VIDEO: PIA/Cobb Tuning give the full STI swap treatment to Subaru Forester rss.feed General Subaru Discussion 3 11-12-2009 11:49 AM



Welcome to Perth-WRX, click here to register!

All times are GMT +8. The time now is 03:53 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO