Useful speed and gear alteration with track tryes

1. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

   #1 14th January 2009, 15:05

   For whoever is interested, I've done some playing about with the quality gear / speed calculator, and I've come up with some stats of how people's speeds, gears, effective final drives, will be affected by different tyres sizes and widths. I've used some likely track tyre sizes... Here goes:
   
   Standard Setup 1a) - 195/45/15 Tyres - VTS/GTI Gearbox (FD 3.938) - 7800 Shift Point
   1st - 38
   2nd - 66
   3rd - 95
   4th - 122
   5th - 152
   Effectively altered FD: N/A
   
   Track Setup 1b) - 195/50/15 Tyres - VTS / GTI Gearbox (FD 3.938) - 7800 Shift Point
   1st - 39
   2nd - 69
   3rd - 98
   4th - 126
   5th - 157
   Effectively altered FD: 3.8
   
   Track Setup 1c) - 205/50/15 Tyres - VTS / GTI Gearbox (FD 3.938) - 7800 Shift Point
   1st - 40
   2nd - 70
   3rd - 100
   4th - 128
   5th - 160
   Effectively altered FD: 3.75
   
   
   
   Standard Setup 2a) - 195/45/15 Tyres - S1 Gearbox (FD 4.54) - 7800 Shift Point
   1st - 33
   2nd - 57
   3rd - 82
   4th - 106
   5th - 132
   Effectively altered FD: N/A
   
   Track Setup 2b) - 195/50/15 Tyres - S1 Gearbox (FD 4.54) - 7800 Shift Point
   1st - 34
   2nd - 59
   3rd - 85
   4th - 109
   5th - 136
   Effectively altered FD: 4.4
   
   Track Setup 2c) - 205/50/15 Tyres - S1 Gearbox (FD 4.54) - 7800 Shift Point
   1st - 35
   2nd - 60
   3rd - 87
   4th - 111
   5th - 139
   Effecively altered FD: 4.32
   
   
   
   Standard Setup 3a) - 195/45/15 Tyres - S2 Gearbox (FD 4.06) - 7800 Shift Point
   1st - 37
   2nd - 64
   3rd - 92
   4th - 118
   5th - 147
   Effectively altered FD: N/A
   
   Track Setup 3b) - 195/50/15 Tyres - S2 Gearbox (FD 4.06) - 7800 Shift Point
   1st - 38
   2nd - 66
   3rd - 95
   4th - 122
   5th - 153
   Effectively altered FD: 3.92
   
   Track Setup 3c) - 205/50/15 Tyres - S2 Gearbox (FD 4.06) - 7800 Shift Point
   1st - 39
   2nd - 68
   3rd - 97
   4th - 124
   5th - 155
   Effectively altered FD: 3.86
   
   
   
   Standard Setup 2a) - 195/45/15 Tyres - 1.4 XSi Gearbox (FD 4.29) - 7800 Shift Point
   1st - 35
   2nd - 61
   3rd - 87
   4th - 112
   5th - 139
   Effectively altered FD: N/A
   
   Track Setup 2b) - 195/50/15 Tyres - 1.4 XSi Gearbox (FD 4.29) - 7800 Shift Point
   1st - 36
   2nd - 63
   3rd - 90
   4th - 116
   5th - 144
   Effectively altered FD: 4.15
   
   Track Setup 2c) - 205/50/15 Tyres - 1.4 XSi Gearbox (FD 4.29) - 7800 Shift Point
   1st - 37
   2nd - 64
   3rd - 92
   4th - 118
   5th - 147
   Effectively altered FD: 4.08
   
   If anyone has any queries or requests, please give me a shout!
2. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #2 14th January 2009, 15:09

   you have to much spare time
3. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #3 14th January 2009, 15:14

   sadder than meeeeee. just messing... interesting results actually dude
4. Jdvtr1 Infrequent Poster Joined: Jun 2006 London United Kingdom (England) Posts: 106

   #4 14th January 2009, 20:08

   That must have taken you some time!! Interesting reading though, id be interested to see how the different tyre sizes affect acceleration and if you would actually notice the difference on either road or track, can anyone comment on this? For example 195/15 against 195/50 with a VTS box.
5. dannygti Saxperience Post Whore Joined: Feb 2006 dudley United Kingdom (England) Posts: 6790 106 gti/ SEAT LCR

   #5 14th January 2009, 20:25

   good stuff, that means ill be geared for 155mph i wonder how long it will take to get there.?.
6. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #6 14th January 2009, 20:39

   Quote:

   Originally Posted by Ryan I like Robbie Williams

   
   puff...
7. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #7 14th January 2009, 21:23

   Quote:

   Originally Posted by adsayer I love take that ..

   queer.
8. jpsaxo Saxperience Post Whore Joined: Oct 2005 Sydney Posts: 8525 Mango Westcoast

   #8 15th January 2009, 00:28

   Very interesting,i wouldnt mind an S1 or Xsi FD for my Box, not sure which would suit better? I'll be running on R888's or A048s all the time now!
9. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

   #9 15th January 2009, 00:30

   imo josh cheaper to sell your box and rebuild from fresh.
   
   think about it the vts box stripped costs and is fucked once out as no diff, then the other box stripping and fitting, better off getting a new diff and box fitting it then selling.
   
   thats what ill do if i build a 1.4 one
10. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

    #10 15th January 2009, 00:35

    semtex has a diffed s1 box for sale atm for 650ish
11. jpsaxo Saxperience Post Whore Joined: Oct 2005 Sydney Posts: 8525 Mango Westcoast

    #11 15th January 2009, 03:20

    Thats More than i paid and mine was brand new!! I've looked at it and if i can get an xsi FD or 1.1 FD Mankees going to wang that in my box
12. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

    #12 15th January 2009, 08:50

    Quote:

    Originally Posted by Ryan semtex has a diffed s1 box for sale atm for 650ish

    Oi! Did you not see my WANTED post on shed? Who's Semtex... I want a diff. Grrr.
13. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

    #13 15th January 2009, 08:52

    Quote:

    Originally Posted by jpsaxo Very interesting,i wouldnt mind an S1 or Xsi FD for my Box, not sure which would suit better? I'll be running on R888's or A048s all the time now!

    Josh, with my r888 now fitted, my S1 box now acts almost identically to an 1.4 XSI box.
14. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

    #14 15th January 2009, 08:56

    Quote:

    Originally Posted by Jdvtr1 That must have taken you some time!! Interesting reading though, id be interested to see how the different tyre sizes affect acceleration and if you would actually notice the difference on either road or track, can anyone comment on this? For example 195/15 against 195/50 with a VTS box.

    Just remember that changing tyre sizes WILL effect your speedo. 195/15? Did you mean 195/45? Going from 195/45 to 195/50 is not a huge change, but it will make a difference. See the info above for the difference it will make to each gear's maximum speed.
15. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

    #15 15th January 2009, 13:09

    Quote:

    Originally Posted by jpsaxo Thats More than i paid and mine was brand new!! I've looked at it and if i can get an xsi FD or 1.1 FD Mankees going to wang that in my box

    except yours isnt an S1 box is it josh
16. Ryanp Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut

    #16 15th January 2009, 13:09

    toad sorry mate only realised last night and didnt check wantred on shed till this morning after you had sent a text to james (semtex)
17. Nij Yorkshire Joined: Apr 2008 Brighouse, W. Yorks Posts: 3699 Citroen C4 VTR Coupe Porsche 924

    #17 15th January 2009, 13:16

    Quote:

    Originally Posted by Jdvtr1 That must have taken you some time!! Interesting reading though, id be interested to see how the different tyre sizes affect acceleration and if you would actually notice the difference on either road or track, can anyone comment on this? For example 195/15 against 195/50 with a VTS box.

    we were both thinking along the same lines there mate.
18. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

    #18 15th January 2009, 13:36

    Quote:

    Originally Posted by Ryan toad sorry mate only realised last night and didnt check wantred on shed till this morning after you had sent a text to james (semtex)

    I'm just kidding mate, no worries.
    
    No reply from James...
19. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #19 15th January 2009, 13:42

    Quote:

    Originally Posted by jpsaxo Thats More than i paid and mine was brand new!! I've looked at it and if i can get an xsi FD or 1.1 FD Mankees going to wang that in my box

    i has a 1.1 box you can have to rip apart for its fd
    wont be use for much else i dont think
    
    
    also interestng read as youve done it for the rev limit my gti will have
    xsi box on a 195 45 tyre
    dont seem too bad tbh
20. Jdvtr1 Infrequent Poster Joined: Jun 2006 London United Kingdom (England) Posts: 106

    #20 15th January 2009, 20:40

    Cheers Toad, yeah I meant 195/45/15 against 195/50/15, I did have a good look at your tables above, as I said interesting reading, what I was reffering to was that id like to see the difference or read other peoples views about in gear acceleration difference's between the 2 tyre sizes.
21. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

    #21 15th January 2009, 22:26

    Being a small amount, it would be difficult to tell the differences IMO. The easiest way would be to look at your speedo Vs your RPM.
    
    I've gone from 195/45/15 to 205/50/15 which is a bigger jump, as the rolling circumference has increased by a larger percentage. I'm struggling to notice the difference in acceleration.
22. jamer Infrequent Poster Joined: Aug 2009 Posts: 156

    #22 9th November 2009, 23:01

    some great calculations there! must of taken you ages to do all them
23. Gordon Frequent Poster Joined: Oct 2008 Posts: 543 Phase-II VTR

    #23 10th November 2009, 15:34

    I'm quire supprised by some of those differences. I'll certainly think twice before going through a camera at X speedo mph when i've got the R888's on.
    
    As it happens, is anyone able to work out the speed differences on a stock VTR between 185/55/R14 and 185/60/R14?
24. Ashleyp Saxperience Hardcore! Joined: Apr 2008 Bedford & Manchester Posts: 17504

    #24 10th November 2009, 15:51

    intresting toad.
    
    those are not top speeds of cars though? just the potential top speed?
    
    any ideads on how much power would be needed to get there?
25. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #25 10th November 2009, 16:20

    ash, I made some stupid formula which is gives a good approximation for the top speed given for a set horsepower (or visaversa), I think it's linked to in one of the stickys within the engine sex-tion.
26. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #26 10th November 2009, 16:26

    http://www.saxperience.com/forum/sho...d.php?t=108006