I've just completed an NA rear swap into my TT - thought I'd post a few figures for those interested.... I did some acceleration runs (on a closed road of course ) before changing the rear end, no other changes bar a new clutch. TT Rear end: 50-100kph 2.79 seconds in 2nd gear 5.63 seconds in 3rd gear NA Rear end: 50-100kph 2.8 seconds in 2nd gear 4.21 seconds in 3rd gear TT Rear end: 20-90kph 6.33 seconds in 2nd gear NA Rear end: 20-90kph 4.98 seconds - 2nd gear TT Rear end: 30-130kph 9.23 seconds in 3rd gear NA Rear end: 30-130kph 8.96 seconds in 3rd gear Didn't do any 0-100 or 400m times as the clutch was well on its way out when I had the TT rear in.... Biggest problem I had with the NA rear end was wheelspin through the midrange - possible causing some funny readings in the 2nd gear 50-100 and 3rd gear 30-130 times, as I was having to back off a bit. Also found that in my 20-90, 50-100 in 2nd and 30-130kph with the NA rear the upper speed was too high, as power drops off after about 6500rpm. Overall - its made a huge difference to the feel of the car, it comes on boost much stronger, and earlier (speed wise) which makes it feel much livelier. I heard someone say it feels like the car is a couple of hundred kg lighter - this would be right. Havent had it back on the road long enough to provide any fuel consumption figures.... but so far on this tank in ECU talk I'm averaging 11.6 l/100km -all round town, short trips, so doesn't seem any worse than normal. Parts required are: NA rear subframe - complete Hub to Hub (brakes can be changed, as can most suspension arms) NA Tailshaft - you need both pieces as the flange on the centre bearing is smaller for the NA rear half. Alternatively you can get a 1 piece made up....probably the best option. NA speed sender for the gearbox. All the above figures are on a TT auto motor with Manual turbos, 2.5" exahust, Apexi Pod, PZP style FMIC and boost jets running 14psi. CheerZ
na rear end conversion or leader gears is AWESOME.. i did this on my z years ago... makes it a totally different beast
on this subject, can anyone tell me what an NA clutch could be rated up to on a TT engine. im thinking of rather than modifying the NA box to fit the TT flywheel and clutch, if i use an NA clutch, say a 6 puk button, could it handle up to around 300rwkw?
hahahahhahah NO !!! u want a na clutch to hold 400 horse... get a TT kit... its not that much grinding that u need 2 do... OR you could do it properly and get a TT box
you cant get em anymore leader gears for z32 were discontinued six months ago, none are being made and what little stock that resellers had is all but gone. I have a set and wont sell because 4:11 diff kicks arse. My plan to install is get a tt donor diff, spend 400 usd getting the rebuild kit from coz and get it done by a pro.
$600 is very steep, ive seen many na rear ends go for around 250 a 1 piece tail shaft will set you back around $350. speedo unit i think about the $100 or so mark. the problem with comparing the two is leader gears are not for sale anymore, only way you'd find a set now is from someone that purchased a set a while ago but never used them....
I ended up paying $240 for the rear end - although it had a couple of bent arms which I replaced with ones from my spare TT subframe, that included the NA Speed sender. Cost me another $65 for the NA tailshaft as the car I got the NA subframe from was a 2 seater. Also paid another $100 I think it was for some adjustable NA toe arms.... So all up could have been done for $305 - ended up just over $400. Plus wheel alignment obviously.... For the performance upgrade per dollar - you dont get much better....boost jets I think are the only thing that comes close. I'd recommend it to anyone if they don't need the extra strength TT rear with leader gears.
prefer to keep the NA box really. and theres only a 20mm surface difference on the fly, surely that couldnt mean that much more pressure no? yeah no that much grinding, but finding a tt fly thats not warped then getting it machined etc is a major f around. so a TT hd clutch would be the best bet ?
i remember a post saying that z32 NA can use r33 gtst clutch? if they are interchangeable then you could get something decent for a r33 gtst which would be fine for your tt conversion.
ohh ok, will do some searching! thanks sandeep, if worse comes to worse, i'll just have to bite the bullet and get a tt fly from somewhere and pray its not worped then get it machined.
get a lightened one From EBAY USA, they are 150USD give or take plus post. Half the weight of a secondhand stock one. Little extra cash for a big difference in rotating mass. My 2 cents
Found this Cant remember if it was coz, z1, specialty etc who had the diff rebuild kit, googled it and came up with this: Link For those in the known does this look the business?
Just a quick update on the fuel consumption - having done round 1500km now, I'm averaging round the 11.5l/100km mark in ECU talk. On the motorway its not as economical as it was, averaging round 10.5-11 for mainly motorway cruising - 105-115kph - But once the speed is down - its at least as good as the TT rear was. The difference in the twisties is unbelievable - if your just cruising you can stay in 5th for most corners, as its happy to pull from 40-50kph without any issue - and when you are 'enjoying the road within the speed limit' the difference in response coming out of corners is amazing! Lets just say it pays to have some decent tyres.... Also very noticeable on the open road - overtaking cars doing 90-100kph, 3rd gear is no longer required - as it just seems to run out of revs too quick... better to pass everything in 4th (up to 100kph of course) All in all - I think its added about 0.5-1l/100km to my average of mixed driving - some open road/motorway, some city driving. Not really enough to break the bank.
