Need some advice... I had 4.56 gears in the past, but never went to the track with them. I sold the gears/diff and I've done all my track days with the 4.10. The guy I sold the gears to is selling his car and parting out the diff. I know the gearing is depend on the track configuration, but is there a benefit (faster laptimes) going from 4.10 to 4.56 ratio? Gears is low on the priority list, but would capitalize on the opportunity if it is somewhat beneficial. Thoughts?

Edit: I just got back to tracking this year, but I figure that NJMP (Thunderbolt/Lightning) & Summit Pt (Main/Shenandoah) will be the most visited tracks in the future. With 1x VIR & WGI per year.

 

Did you have to cut the side pieces to get them back in? I was somehow able to cram mine back in with out cutting, but I haven't seen others able to do the same thing. I am interested to see how you did the tray though.

 

I really like having the gears, also keep in mind that you can't get the 4.56s anymore unless you find them used. I had to go with the 4.44s instead during my last diff replacement.

 

I have 4.77's. Sometimes they're too short. Other times it's helpful...

 

I did cut the side pieces. I was sort of able to cram them back in, and they would probably have been ok, but I couldn't quite line up the hole where the screw would go. I just wasn't quite comfortable leaving the things in there without any sort of fastener, even though they were pretty snug. You can see where I lined the green painter's tape was where I cut.

 

Aaron, Oleg's gold RPF1s are up for sale...

 

I just used some standard zip ties to loop around the roll bar, there are 4 holes. Simple, yet effective. It is held down really well now. Plus, if running top down, the top is laying on the tray anyway

Edit: Pictures are always a 1000 words

 

Dude, use black zip-ties!

^This. In theory using lower diff gearing makes the gearbox more usable by lowering 6th gear to something that is needed on track. But as I found out it's track dependent. I had to add two shifts per lap when I went from 4.10 to 4.44 gearing on Summit Main. I only have two events with the lower gearing so I can't say if it has lowered my lap times around Summit Main but I doubt the gearing change was beneficial.

If you have to open your diff anyway you might consider a gear swap, but even then it's big money and hit-or-miss on helping on any particular track.

 

I know I bought a pack with 1000 zip ties! not realizing that the only ones actually in there long enough to wrap all the way around were the white ones. I would have to link 3 together of the black ones to reach. I'll probably eventually cut these ones off and replace them with some black ones.

Is the LSD more beneficial than the gearing change?

 

David, your next track car:











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