Need help with Aim MXP Pre-Calculated Gears for a GT4 CS - Page 2 - Rennlist - Porsche Discussion Forums

Notices
Racing & Drivers Education Forum
Sponsored by:
Sponsored by:

Need help with Aim MXP Pre-Calculated Gears for a GT4 CS

 
Old 03-15-2019, 10:27 PM
  #16  
ProCoach
Rennlist Member
Rennlist
Small Business Partner

 
ProCoach's Avatar
 
Join Date: Jun 2008
Location: Durham, NC and Virginia International Raceway
Posts: 11,943
Default

Originally Posted by GT345 View Post
Off hand do you know if it is the rolling circumference 83.12, or the diameter of the wheel 26.81?
It specifically states wheel circumference, not the diameter.
__________________
-Peter Krause
www.peterkrause.net
"Combining the Art and Science of Driving Fast!"
Professional, Private Driver Performance Analysis
Authorized Sales and Support for AiM Sports, VBOX Video, MoTeC, AutoSport Labs, RaceVoice LLC, Apex Pro and Cosworth Electronics
ProCoach is offline  
Old 03-15-2019, 11:25 PM
  #17  
GT345
Addict
Rennlist Member
Thread Starter
 
GT345's Avatar
 
Join Date: Feb 2017
Location: California
Posts: 472
Default

Originally Posted by ProCoach View Post
It specifically states wheel circumference, not the diameter.
It surely does... Someone else gave me the wrong info.

Thanks again, will let you know if that did the trick!
GT345 is offline  
Old Yesterday, 05:17 PM
  #18  
Krokodil
Addict
Rennlist Member
 
Krokodil's Avatar
 
Join Date: Aug 2007
Posts: 659
Default

Originally Posted by ProCoach View Post
Your AiM dealer should be able to help you with this after you enter the intermediate ratios.

The ratios I have are: 3.909 2.292 1.654 1.303 1.081 0.881 with 3.25 final drive

The tire companies (depends on the tire you use) have the wheel circumference (this is for the rear wheel). Pirelli 680, IIRC

The default timeout works fine and the ECU RPM channel name should be used. The speed should be set to GPS speed.
Setup for the PDK requires an adjustment when calculating final drive, as there is an intermediate shaft, or Constant Ratio shaft (CR), that creates a second multiplier.

The 2016 Clubsport has CR shaft with a ratio of 1.146, which when multiplied by the R&P ratio of 3.25 yields a final drive of 3.72.

For comparison, the street 2011 Cayman S PDK has the same 1-6 ratios, but has a CR 1.114 and a R&P ratio of 3.090, yielding a final drive of 3.25.

Cheers,
Krokodil is offline  
Old Yesterday, 05:58 PM
  #19  
GT345
Addict
Rennlist Member
Thread Starter
 
GT345's Avatar
 
Join Date: Feb 2017
Location: California
Posts: 472
Default

Originally Posted by Krokodil View Post
Setup for the PDK requires an adjustment when calculating final drive, as there is an intermediate shaft, or Constant Ratio shaft (CR), that creates a second multiplier.

The 2016 Clubsport has CR shaft with a ratio of 1.146, which when multiplied by the R&P ratio of 3.25 yields a final drive of 3.72.

For comparison, the street 2011 Cayman S PDK has the same 1-6 ratios, but has a CR 1.114 and a R&P ratio of 3.090, yielding a final drive of 3.25.

Cheers,
Interesting... It is a simple update and I can test it both ways to see which works.

Do you currently use an Aim device with pre calculated gears?

On a side note I found my owners manual for the CS and it did show the gears stated originally by ProCoach, with a FDR of 3.25
GT345 is offline  
Old Yesterday, 06:38 PM
  #20  
Krokodil
Addict
Rennlist Member
 
Krokodil's Avatar
 
Join Date: Aug 2007
Posts: 659
Default

Originally Posted by GT345 View Post
Interesting... It is a simple update and I can test it both ways to see which works.

Do you currently use an Aim device with pre calculated gears?

On a side note I found my owners manual for the CS and it did show the gears stated originally by ProCoach, with a FDR of 3.25
Interesting on the owners manual. Please post a pic of the page, as I am curious whether the manual states Final Drive or R&P.

The ratios I posted above came from this document: https://clubsport.pcaclubracing.org/...d-April-20.pdf

Here is an extract:

6speed Sport Porsche Doppelkupplung (PDK)

Gear ratios:
1st gear 43/11 i = 3.909
2nd gear 55/24 i = 2.292
3rd gear 43/26 i = 1.654
4th gear 43/33 i = 1.303
5th gear 40/37 i = 1.081
6th gear 37/42 i = 0.881
Reverse gear 39/11 i = 3.545
Constant 47/41 i = 1.146
Ring gear & pinion 39/12 i = 3.250

Last edited by Krokodil; Yesterday at 07:53 PM.
Krokodil is offline  
Old Yesterday, 06:46 PM
  #21  
GT345
Addict
Rennlist Member
Thread Starter
 
GT345's Avatar
 
Join Date: Feb 2017
Location: California
Posts: 472
Default

Originally Posted by Krokodil View Post
Interesting on the owners manual. Please post a pic of the page, as I am curious whether the manual states Final Drive or R&P.

The number I posted about came from this document: https://clubsport.pcaclubracing.org/...d-April-20.pdf

Here is an extract:

Transmission (gearbox/differential lock)
6speed Sport Porsche Doppelkupplung (PDK)
Gear ratios:
1st gear 43/11 i = 3.909
2nd gear 55/24 i = 2.292
3rd gear 43/26 i = 1.654
4th gear 43/33 i = 1.303
5th gear 40/37 i = 1.081
6th gear 37/42 i = 0.881
Reverse gear 39/11 i = 3.545
Constant 47/41 i = 1.146
Ring gear & pinion 39/12 i = 3.250

I think your right about the R&P and that PDF looks like the same ratios as the manual i was looking at.

Thanks for your input!

Last edited by GT345; Yesterday at 07:03 PM.
GT345 is offline  
Old Yesterday, 09:23 PM
  #22  
ProCoach
Rennlist Member
Rennlist
Small Business Partner

 
ProCoach's Avatar
 
Join Date: Jun 2008
Location: Durham, NC and Virginia International Raceway
Posts: 11,943
Default

Originally Posted by Krokodil View Post
Setup for the PDK requires an adjustment when calculating final drive, as there is an intermediate shaft, or Constant Ratio shaft (CR), that creates a second multiplier.

The 2016 Clubsport has CR shaft with a ratio of 1.146, which when multiplied by the R&P ratio of 3.25 yields a final drive of 3.72.

For comparison, the street 2011 Cayman S PDK has the same 1-6 ratios, but has a CR 1.114 and a R&P ratio of 3.090, yielding a final drive of 3.25.

Cheers,
Thanks. I was using Calc Gear on the CS's that I looked after. Good info.
__________________
-Peter Krause
www.peterkrause.net
"Combining the Art and Science of Driving Fast!"
Professional, Private Driver Performance Analysis
Authorized Sales and Support for AiM Sports, VBOX Video, MoTeC, AutoSport Labs, RaceVoice LLC, Apex Pro and Cosworth Electronics
ProCoach is offline  
 


Thread Tools
Search this Thread

Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: