Results 1 to 9 of 9

New gears with A4 after tune?

This is a discussion on New gears with A4 after tune? within the General Help forums, part of the LSx Technical Help Section category; Ok guys just have the ride dyno tuned it's an A4 and I put 3:73's in. With stock gears and ...

  1. #1
    Junior Member
    Join Date
    Aug 2014
    Location
    Wood dale, Illinois
    Posts
    33

    Black

    New gears with A4 after tune?

    Ok guys just have the ride dyno tuned it's an A4 and I put 3:73's in. With stock gears and new gears before tune it would have solid downshifts at 20-25 and 60-65mph...now after the tune it seems it's good at 15-20mph and the 60 one is non-existent..there is a OK one at 45-50 but still nothing impressive...has anyone else had these issues?? The tuner claims to not have messed with anything via trans but did correct speedo. Not sure if it's tune or trans potentially on its way out..also there 63K original miles on car.

  2. #2
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    It's been my experience tuning these things that when ever there is a gear change with the auto's, the shift points will need tweaking (mine always have)

    Trans tables have rpm as well as mph that have to match to some extent on both upshifts and downshifts. When the rear gear is changed the mph no longer matches the rpm in the tables, so some tweaking has to be done in those tables.

  3. #3
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,519

    98 Formula
    06 duramax

    yep.....tuner needs to adjust those tranny tables.

  4. #4
    Junior Member
    Join Date
    Aug 2014
    Location
    Wood dale, Illinois
    Posts
    33

    Black
    Thanks guys I'll be letting him know what's got to be done..will it cause any harm to the trans or rear end in the mean time while I wait to get to shop. This is my daily driver for the most part unless I'm taking train to work.

  5. #5
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    If you drive it civilized I'm sure it would be okay. But I wouldn't wait 3 months to get the issue corrected either.

  6. #6
    Junior Member
    Join Date
    Aug 2014
    Location
    Wood dale, Illinois
    Posts
    33

    Black
    Ok so I'm having tuner tweak in trans tables the shift points what he originally put in that would be "mathematically" correct to 3:73's anything over 27mph it wouldn't downshift to 1st that has been bumped to 30 and highway speeds we changed from 61 to 66 for it to shift into 2nd. What kinda of mph do you guys have to be in to get your downshifts?

  7. #7
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    Depends, I tweak it on the street until I'm happy. Alot has to do with where you have maximum rpm shift points. If the engine is stock and still limited to 6,000 rpm, then your limited to how far up you can bump your downshifts.

    With 3.73's, a 3.06 first gear, and 26" tires, and limited to 6,000 rpm, you'll only reach 40 mph before it shifts to 2nd gear. With that said I wouldn't bump the 1st gear downshift any higher than 30 mph.

  8. #8
    Junior Member
    Join Date
    Aug 2014
    Location
    Wood dale, Illinois
    Posts
    33

    Black
    Well I wasn't sure to switch the maximum rpm shift point. The internals on motor are all stock should I leave it at 6K max rpm still? The shop is cool with adjusting anything until my liking.

  9. #9
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    Location
    Arizona
    Posts
    12,552
    Yep I'd leave that at 6k max since it's stock.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. rebuild ls1 engine with cam, diff gears, maff tune
    By rikkibobby in forum Internal Engine
    Replies: 3
    Last Post: 08-23-2009, 08:32 AM
  2. Is headers tune and gears worth the money.
    By Street Fighter in forum External Engine
    Replies: 5
    Last Post: 02-10-2009, 10:29 AM
  3. new gears need a tune?
    By bad4ss in forum Computer & Tuning
    Replies: 6
    Last Post: 03-05-2008, 10:24 PM
  4. new cam and gears need tune?
    By john yerxa in forum Computer & Tuning
    Replies: 2
    Last Post: 02-22-2008, 02:23 PM
  5. gears and tune question
    By turbotko in forum Drivetrain
    Replies: 4
    Last Post: 08-30-2006, 08:04 AM

Bookmarks

Posting Permissions

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