Results 1 to 4 of 4

Thread: Tyre size change

  1. #1
    Junior Member JuhaniLS1's Avatar
    Join Date
    Nov 2006
    Posts
    29

    Default Tyre size change

    Does going from stock Camaro SS with E92 245/275 tyre combo to 1LE 285/305 combo have any other changes to be done than speedo calibration, as new combo is bit smaller and also slightly mismached in high. Stock setting speedo read 2% too much against GPS now about 5%. Do I calibrate something in T43 too.
    This is 2018 manufactured Euro spec car. I have managed to read calibration.
    Camaro SS Hyper Blue EU -19

  2. #2
    Junior Member JuhaniLS1's Avatar
    Join Date
    Nov 2006
    Posts
    29

    Default

    Hmm. I have read posts about this, seems to be not so simple as it was in LS1. Is the speed signal coming from VSS or ABS does Camaro have VSS? There is rear ratio in parameters, 2,77 on auto, now because tyres are smaller car sees higher ratio in practise, what happens if you change ratio 5% will it compare it to ABS and then ralationship is wrong and it pukes or?
    Camaro SS Hyper Blue EU -19

  3. #3
    Junior Member JuhaniLS1's Avatar
    Join Date
    Nov 2006
    Posts
    29

    Default

    Well I chanced pulses/km from 465 to 490 and now speedo reads exactly same as GPS at all speeds. Did not notice any chances in shifting and no mils.
    Camaro SS Hyper Blue EU -19

  4. #4
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    Yes, it has VSS, it is a TCM pid.

Similar Threads

  1. Newbie tire size change
    By ZLands in forum General
    Replies: 0
    Last Post: January 21st, 2019, 03:00 PM
  2. Lost vehicle speed sensor reading after tyre size change
    By psini in forum Allison 5 & 6 Speed
    Replies: 0
    Last Post: January 30th, 2017, 12:03 AM
  3. why cant i change my tire size
    By rebuelta22 in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 3
    Last Post: March 24th, 2012, 04:56 PM
  4. Dashboard - change size of the range?
    By Wallyman in forum EFILive V4
    Replies: 0
    Last Post: March 31st, 2009, 05:32 AM
  5. Tire size change calulation
    By Z16DNA in forum General (Petrol, Gas, Ethanol)
    Replies: 6
    Last Post: January 19th, 2005, 07:52 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •