ray007 Posted March 18, 2010 Share Posted March 18, 2010 hi all, need some advice im doing an na-TT conversion and also a 5speed manual conversion, could i used the TT6 diff? would it be compatible? or would i need a few extra's. any advice appreciated Quote Link to comment Share on other sites More sharing options...
Homer Posted March 18, 2010 Share Posted March 18, 2010 Assuming you refer to a Pre-facelift TT6 diff (the big one): IIRC you'll need the back section of the TT6 prop and one TT6 driveshaft (can't recall which side). Not the simplest of swaps, but certainly do-able. The drive ratio's will be really poor with the W58 as the TT6 diff has a very high ratio. Take a look here to see the effect: http://www.mkivsupra.net/vbb/showthread.php?t=184490 It'll mean slower acceleration but a much longer gear. Will not be nice to drive, i.e. nearly 50mph in first gear, over 80mph in 2nd! Quote Link to comment Share on other sites More sharing options...
ray007 Posted March 19, 2010 Author Share Posted March 19, 2010 thanks bud much appreciated, what if i use an auto n/a diff with the w58? how would that be? any better? Assuming you refer to a Pre-facelift TT6 diff (the big one): IIRC you'll need the back section of the TT6 prop and one TT6 driveshaft (can't recall which side). Not the simplest of swaps, but certainly do-able. The drive ratio's will be really poor with the W58 as the TT6 diff has a very high ratio. Take a look here to see the effect: http://www.mkivsupra.net/vbb/showthread.php?t=184490 It'll mean slower acceleration but a much longer gear. Will not be nice to drive, i.e. nearly 50mph in first gear, over 80mph in 2nd! Quote Link to comment Share on other sites More sharing options...
Homer Posted March 19, 2010 Share Posted March 19, 2010 Auto NA diff would be a direct drop in. The ratio on the NA diffs are all the same (4.083 IIRC), so doesn't matter if it's from an auto or manual. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 19, 2010 Share Posted March 19, 2010 if i could jump in, i am not inteligent enough to use your ratio calculator so could you tell me how the r154 would compairto the w 58 using the 4.083 final drive Quote Link to comment Share on other sites More sharing options...
Homer Posted March 19, 2010 Share Posted March 19, 2010 Here you go... Not a huge amount of difference, the r154 is closer ratio and has slightly longer 5th, so would be a nicer drive ones it's out of first (which is a bit tall at 38mph) If you're running a different size tyre let me know and I'll put that in. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 19, 2010 Share Posted March 19, 2010 im running a 275/35/18 rear if you could dial that in , thanks alot Quote Link to comment Share on other sites More sharing options...
Homer Posted March 19, 2010 Share Posted March 19, 2010 here they are. The overall diameter is a bit larger so the gear speeds will be a bit longer. You gain 3-4 mph in 5th. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 19, 2010 Share Posted March 19, 2010 verry helpfull and much apriciated Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted March 19, 2010 Share Posted March 19, 2010 That spreadsheet really is something Darryl Quote Link to comment Share on other sites More sharing options...
Homer Posted March 19, 2010 Share Posted March 19, 2010 BTW, if you want a car that's a better drive on the A and M roads, rather than a closer ratio and lower top speed, an auto TT diff might be worth thinking about. They are the same fitment as the NA diff, just needs a different back half of the prop (from an auto TT) It'll make it possible to cruise at 80-100mph at rpm's more like the 6 speed. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 19, 2010 Share Posted March 19, 2010 what is the final drive of the tt auto diff? i thatght it was the same as the n/a open diff Quote Link to comment Share on other sites More sharing options...
Homer Posted March 19, 2010 Share Posted March 19, 2010 They are different mate. Here's a summary (from the gear calculator ). LSD or Open makes no difference to the ratio. NA auto, 5spd = 4.083 NA 6spd = 3.769 TT jspec auto = 3.769 TT jspec 6spd pre-facelift = 3.267 (The "big" diff) TT jspec 6spd facelift = 3.266 TT UK spec auto = 3.769 TT UK spec 6spd = 3.133 Quote Link to comment Share on other sites More sharing options...
leeg Posted March 19, 2010 Share Posted March 19, 2010 hi, was wondering how much a manual conversion would be for my supra. does anybody know??? Quote Link to comment Share on other sites More sharing options...
Homer Posted March 19, 2010 Share Posted March 19, 2010 hi, was wondering how much a manual conversion would be for my supra. does anybody know??? It's not really the place to ask and depends on your current car and spec. Baseline price inc fitting (but can vary massively): 5spd NA setup: £1200 + clutch & flywheel 6spd TT setup: £2500 + clutch & flywheel Quote Link to comment Share on other sites More sharing options...
ray007 Posted March 27, 2010 Author Share Posted March 27, 2010 one last question, i know i should use th calc but i rather hear it from homer, im currently about to run a Tt engine with w58 and n/a auto diff (car is originally n/a auto aero), with bpu mods such as 1st&2nd decat, 1bar RR, standard side mount intercooler, hks FCD, walbro fuel pump, ik22 plugs. What do you think the out come would be? nice drive? And how much difference would it make if i use a TT auto diff? many thanks Quote Link to comment Share on other sites More sharing options...
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