Results 1 to 20 of 22

Thread: CRX Si Transmission Concern

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Join Date
    Jul 2010
    Location
    West Michigan
    Posts
    120

    Default CRX Si Transmission Concern

    Hello all! Since I had such great success with my last forums post on here with my brake problems I am back with a concern that has shown up since my last race.

    Pulling the car out of the trailer last week I noticed that the shifter feels still shifting into and out of 3rd and 4th gear (same shifter fork). I haven't had a chance to take it up to speed or to get the fluid warm yet to see if it goes away but I wanted to see if someone may have some previous knowledge on this subject.

    The trans in the car has a Quiafe LSD installed with a 4.7 final gear. I am currently running Redline MT-90 since beginning of last season. This fluid was recommended to me by some other Honda racers though after more research on here I am concerned about continuing to run MT-90.

    I am looking to go to Mid O the end of this month and do not believe I will have time to dismantle the trans and replace parts before the race. Changing fluid would be easy enough to do though.

    To save myself the possible destruction of a trans, does this sound like the beginning of a part failure? After some reading I am planning on changing out the fluid to see if it improves which starts up the fluid debates: Honda MTL or go with Redline again either fresh MT-90 or MTL or Shockproof.

    Any insight would be much appreciated.

    Thank you!

  2. #2
    Join Date
    May 2007
    Location
    Delaware, OH
    Posts
    185

    Default

    I use straight Mobil1 10W30 in my D-series trans (Quaife LSD and ATS FD). I change the fluid once a season and it always comes out nice and translucent. No issues and I've run three seasons w/o the need for a rebuild (of course now that I've made that statement it'll disintegrate at the next event ).
    Dan
    2010, 2011, 2012 & 2013 Great Lakes Division ITB Champion

  3. #3
    Join Date
    Jul 2010
    Location
    West Michigan
    Posts
    120

    Default

    After some more research I am staying away from Redline MTL - lacking the additives for the LSD per Redline's comments and other users experiences. For the application Redline recommends MT-90 (of course).

    I have a few quarts still of MT-90 so I leaning towards changing it out and see what it feels like with new fluid in it.

    As far as the sticky shifting; I can't come up with a part that would be failing aside from something adjustable that would cause the shifting to feel sticky while sitting still with the clutch in engine on or off.

    I was having difficult shifting at Grattan a few weeks back in high g-force right hand turns. My theory being some twist in the system as it loaded up under the g's. To counter this pulling back and to the right a bit made it feel smooth during the high g corners from third to fourth gear. The other times shifting from third to fourth was done in straight sections and felt fine.

  4. #4
    Join Date
    Feb 2002
    Location
    Gainesville, GA
    Posts
    493

    Default

    I know nothing about nothing with the CRX so keep that in mind.

    With the difference in shift effort based on corner load, I would look at the shift linkage and engine/transmission mounts. Makes me wonder if a mount is going bad and the engine/transmission is moving causing a bind in the shifter linkage.

    Just my .03 (inflation).

  5. #5
    Join Date
    Jun 2001
    Location
    LaCrosse Wis
    Posts
    302

    Default

    Used Mobil 10 x 30 for 6 years on CRX with quaif. Never changed it, never had a problem. I can recommend it.

  6. #6
    Join Date
    May 2007
    Posts
    184

    Default

    Runaway from Redline MT-90 or Honda MTL. The Honda fluid is too thin and the Redline fluid attacks the plastic bearing cages.

    10w30, Pennzoil Synchromesh, Torco MTF, Torco RTF, Amsoil, in that order from cheapest to most expensive.

    Will you be at IT Fest next weekend? I hope to make it up Saturday night but if it is hot I'll sneak in Sunday morning.

    I also plan on attending the NASA Nats in September to help out Sam Myers and others. I saved Colin Brotha's weekend last year by bring a shifter fork assembly with me and installing it Sat. night so he could race on Sunday.
    BoneSpec Transmissions
    Honda D-series tranny specialist

  7. #7
    Join Date
    Oct 2011
    Location
    WNY
    Posts
    65

    Default

    I don't intend to completely hijack, but I also have a CRX. I can't remember 100%, but I believe the previous owner told me that Kaaz. He used (and gave me some extra) MTL, which I did a fluid change with earlier this year. It sounds like my next change will be to something different. What brand of stuff do you advise bonespec? It looks like Pennzoil for fluid, but it looks like a bunch of different manufacturers have posi additive. Thanks!
    Kyle C
    #69 ITA Honda CRX
    Glen Region Timing & Scoring Chief

  8. #8
    Join Date
    Jul 2010
    Location
    West Michigan
    Posts
    120

    Default

    Quote Originally Posted by kcolbey View Post
    I don't intend to completely hijack, but I also have a CRX. I can't remember 100%, but I believe the previous owner told me that Kaaz. He used (and gave me some extra) MTL, which I did a fluid change with earlier this year. It sounds like my next change will be to something different. What brand of stuff do you advise bonespec? It looks like Pennzoil for fluid, but it looks like a bunch of different manufacturers have posi additive. Thanks!
    I changed out to the Pennzoil syncromesh before my last race at Mid O. Shifts did not feel much different aside from it seemed to help the slightly sticky reverse. When I drained my fluid I didn't see any contaminants from the Redline but that is not to say it would damage the plastic in a way that would cause contaminants.

    The biggest thing I am noticing with my trans now is a bad or failing motor mount. As I load the engine on elevation changes it becomes difficult sometimes to find fourth gear especially; occasionally third. I will be replacing the motor mounts this winter with a higher durometer mount per the motor mount rules added to IT this past year.

  9. #9
    Join Date
    May 2003
    Location
    Lagrangeville, NY
    Posts
    694

    Default

    Quote Originally Posted by darthmonkeyIT View Post
    . I will be replacing the motor mounts this winter with a higher durometer mount per the motor mount rules added to IT this past year.
    Window Weld.
    Chris Raffaelli
    NER 24FP

  10. #10
    Join Date
    May 2007
    Posts
    184

    Default

    Quote Originally Posted by kcolbey View Post
    I don't intend to completely hijack, but I also have a CRX. I can't remember 100%, but I believe the previous owner told me that Kaaz. He used (and gave me some extra) MTL, which I did a fluid change with earlier this year. It sounds like my next change will be to something different. What brand of stuff do you advise bonespec? It looks like Pennzoil for fluid, but it looks like a bunch of different manufacturers have posi additive. Thanks!
    Pennzoil Synchromesh and Trans-X posi trac additive has served many well, 1.7-2 bottles of Pennzoil and 1/3 tube of the posi additive. Autozone stocks them side by side.
    BoneSpec Transmissions
    Honda D-series tranny specialist

  11. #11

    Default

    Just chiming in to say take bonespecs advice. I installed the 4.7FD early last year in my ITA CRX along with a refresh (3 new synchros and new shift forks). I tried the Amsoil Synchromesh, the one that says it works for Honda boxes on the label, and I got a crunch in 3rd. Same with Redline. Too slippery for the syncho.

    Picked up the Pennzoil synchromesh and I've done 17 races on it now with lots of abuse and not a single crunch. I don't have a plate diff so I do not use additives.

  12. #12
    Join Date
    May 2007
    Posts
    184

    Default

    Sean, whose 4.7 FD was in the tranny?

    Please don't say ATS.

    Seems last years problem was more than you thought.
    BoneSpec Transmissions
    Honda D-series tranny specialist

  13. #13
    Join Date
    Jul 2010
    Location
    West Michigan
    Posts
    120

    Default

    I will see what I can find on the 4.7FD. Previous owner may have left me the receipts from the install though I am not sure if he put it in or not. I know he added the differential.
    2012 Third Place ITA Great Lakes Division
    1990 Honda CRX Si (ITA)
    2007 BMW X3 Sport (Stop Light Time Trials)

Bookmarks

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
  •