Just wondering out of all you guys who have done this mod, how did you like it? I'm strictly talking performance/acceleration wise, i could not care less about why you don't like it because of "fuel consumption". I know Wizard said it was probably one of the best mods he had done, did you every manage to do a back to back at the drags, Ron? I'm asking because i've never had the chance to drive a TT with anything other than the 3.69 gears. Car has auto cams, manual turbos, N/A diff and will be on E85 with around 22PSI but i'm just trying to gauge how it will be on the low end.
go leader gears to keep the stock TT half shafts. I wouldnt put the NA diff in because of the NA half shafts. I think the $800 would be better spent on a nitrous kit.
Changing the diff ratio to 4.08 ( n/a diff ) or 4.1 ( Leader Diff ) IS one of the best things you can do to a TT Zed, this really improves drive-ability and responsiveness. I have haven't noticed any increase in fuel consumption, I guess this would depend on what sort of driving is done. While I haven't broken my n/a diff ... yet ... I would use the Leader diff if I was drag racing.
If I was to build another zed from scratch, I would do the NA diff into TT swap every time. One of the best mods for sure. Makes the car feel about 250kgs lighter.
agree that the leader gears are the "correct" way to do it. but theres not many around, and they are pricey plus need to be installed etc etc. can pick up complete NA rear subframe for a few hundred (sold the last one i had from a wreck for $250) also have not heard of anyone blowing a NA diff with too much power, though i do vaguely recall one halfshaft failure a few years back....
Well after owning both (and driving the same car before and after) I have to say I'm not a fan. Na ratios don't really suit street driving IMHO and 1st gear becomes even more useless in a tt. End of the day it probably comes down to personal preference though.
If you already have the gears leave it and judge for yourself . I would never go back to 3.69 from a performance point of view .
NA rear is the best bang for buck performance mod in a TT bar boost jets.... 1st gear is a bit short - but in the rest of the gears its awesome.... I have a few figures from my swap in this thread: http://www.aus300zx.com/forum/showthread.php?t=301381 Although I did eventually do this through axle tramp and 2nd gear with 285 Semi Slicks on the back....
If you guys want to run 4.1 ratio but can't get Leader gears & don't want to break half shafts (it WILL happen if driven hard) then here's an option for you to consider: R32 GTR diff R200 so will bolt in to the NA subframe Six bolt output shafts so you can run the TT half shafts Problem = width of diff from flange to flange Solution = correctly made spacers to suit. GTRs ran a MUCH better diff than the NA Z32 as well so there is a benefit in that as well. I went from the 3.69 ratio to the leader gears with no other changes & dropped about half a second off the qtr mile times, car is near enough impossible to drive when warming up engine & tyres etc without wheel spin. If you even think about accelerating during a corner it will step out sideways, there are a few other factors contributing to this other than the drive ratio though.
My take I had a set of leaders but sold them as 1. They are pricey 2. Install is expensive. Went with a NA 5 speed, TT flywheel/clutch, one piece NA steel drive shaft and NA diff/cradle. Pros were the removal hicas, diff ratio, cost, can do all the work yourself (ie rebuilding a diff not a cake walk) and the rear bearings for a na are cheap where as tt can only get genuine and the price is crazy.
I believe the GTR R200 also has a longer nose than Z32 R200. John P would know they have used a GTR diff for years.
It runs the CV joint type input flange & that is longer than the NA uni joint type flange but the housing is the same/similar & bolts in to the NZ Z32 cradle. A custom drive shaft would be required.
