Announcement

Collapse
No announcement yet.

Rear end gearing?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Rear end gearing?

    Hey guys, I need your help.

    I have an S13 that I just finished putting an LS2 in. I used the Sikky kit that I am very pleased with, however, I decided to go with a Tremec TKO 600 instead of the T56. Lighter, smaller, and easier to install. Unfortunately 5th gear is an overdrive, and a pretty tall one at that. Here in Nor Cal we have Sears Point, Laguna Seca, and Thunder Hill, all of which require a shift into 5th on their straights. I figure the best solution is to put a different 5th gear in that is only a little over the 1 to 1 of 4th instead of the big overdrive jump. That is a can I would like to kick down the road a bit as I shake the bugs out of the project, sooo, my solution for now is to get a rear end that is taller that what I have currently which is what i believe to be a Silvia JDM spec viscous unit. I am told the tallest bolt in rear end for the S13 is a 300ZX TT unit, is this true, and if so is it truly a bolt in? Furthermore If I wanted to have a quaife or something similar with a custom ring and pinion where should I get that done?

  • #2
    Go with the .8 overdrive TK unit, the road race version.

    What your engine and powerband is will dictate the final drive.
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
    http://www.nissanroadracing.com/showthread.php?t=5902

    Comment


    • #3
      You want a shorter gear it sounds like. I believe Cody here has or had a 4.9 and based on that I just ordered one.

      I havent heard of anything that will fit that is any taller.

      Comment


      • #4
        Definitely not shorter, first gear is so low it's unusable, 2nd is only for slow corners with traffic, I'm constantly rowing through third, fourth , and fifth, and fifth is way too tall. My objective for now is to make it a usable 4 speed and leave fifth unneeded until I change it internally in the transmission.

        Comment


        • #5
          Def, where can I get the TK unit?

          Comment


          • #6
            Just search around for TK600 road race gearing. I think it's a 0.80 or 0.82 5th.

            If you have a stock 4.08 and want things a hair longer it's easy to find 3.9 J30 rear ends. Then there's the Q45 3.69 for even longer.

            What size tires do you have?
            '18 Chevrolet Volt - Electric fun hatch for DD duty!


            DefSport Koni Sleeve and Spring Perch Buy!!!
            http://www.nissanroadracing.com/showthread.php?t=5902

            Comment


            • #7
              Ah gotcha. I thought you wanted to make a too-tall 5th more usable.

              Comment


              • #8
                isn't the S15's rearend pretty numerically low because of the 6-speed? like 3.692? Those should be fairly easy to find bare since most people put (atleast) their 4.08 gear on them when installing?...hmmm just had a mental flash back about the bolt diameter being different on those ring gears needing a bushing or something.


                New idea, buy a s15 Helical complete in pumpkin, then you have a better diff and a spare everything no setup required, (propper setup can cost as much as that diff in housing)
                I am SKULLWORKS

                Comment


                • #9
                  Yep, S15 R200 is 3.69 and uses 13 mm dia ring gear bolts vs 12 mm bolts in the earlier R200s.
                  '18 Chevrolet Volt - Electric fun hatch for DD duty!


                  DefSport Koni Sleeve and Spring Perch Buy!!!
                  http://www.nissanroadracing.com/showthread.php?t=5902

                  Comment


                  • #10
                    Okay, how do I know what rear end I have currently? The flanges for the axles are five bolt and have ears on them where the bolt holes are. Does that help?

                    Comment


                    • #11
                      tires currently are 275/40/17 at all four corners, I am planning on moving up to 18"s so I can run real slicks and an 11" wide wheel in the rear, any good wheel suggestions?

                      Comment


                      • #12
                        Rotate input shaft, count rotations of output shaft. Really easy to do when you turn the input shaft 10x. Rotation of output shaft is your ratio.

                        Or pop the rear cover off and look at the ratio stamped on the ring gear.
                        '18 Chevrolet Volt - Electric fun hatch for DD duty!


                        DefSport Koni Sleeve and Spring Perch Buy!!!
                        http://www.nissanroadracing.com/showthread.php?t=5902

                        Comment


                        • #13
                          Are you asking for wheel recommendations or rear end gearing suggestions or ??

                          Comment


                          • #14
                            For 18" wheels, it's hard to beat Enkei RPF1's for weight, price and durability if you can handle a 10.5" wide wheel.
                            '18 Chevrolet Volt - Electric fun hatch for DD duty!


                            DefSport Koni Sleeve and Spring Perch Buy!!!
                            http://www.nissanroadracing.com/showthread.php?t=5902

                            Comment


                            • #15
                              BTW - I can probably save you a few bucks on a set if you're interested in new - pm me.
                              '18 Chevrolet Volt - Electric fun hatch for DD duty!


                              DefSport Koni Sleeve and Spring Perch Buy!!!
                              http://www.nissanroadracing.com/showthread.php?t=5902

                              Comment

                              Working...
                              X