Sharpie Posted December 1, 2005 Share Posted December 1, 2005 Which is the best Turbo for the track ? If you go too small, will you build up too much heat and have cooling issues ? If you go too big, will there be too much lag ? If you want a smooth delivery of power rather than a big snap of power, as this might not be so good out of a corner.... What else needs to be considered for the Turbo ? This Turbo is only for the track, not multi-use i.e. Track, road, Drag strip. Link to comment Share on other sites More sharing options...
carl0s Posted December 1, 2005 Share Posted December 1, 2005 Auto or Manual would be the major concern I'd have thought. Link to comment Share on other sites More sharing options...
Sharpie Posted December 1, 2005 Author Share Posted December 1, 2005 Auto - in my sig Link to comment Share on other sites More sharing options...
TLicense Posted December 1, 2005 Share Posted December 1, 2005 It would be track dependant. Tight and twisty = small/less spool Long and sweepy = big/powerful. Link to comment Share on other sites More sharing options...
Alex Posted December 1, 2005 Share Posted December 1, 2005 I'd say on an Auto you'd want something that's always in the powerband from 3600rpm up....This would make the new T67DBB from BL or the older T67DBB's from PHR the best choice. Or a 61 with a larger exhaust A/R than my .68. Link to comment Share on other sites More sharing options...
eyefi Posted December 1, 2005 Share Posted December 1, 2005 it's a really tough call and driving style/skill and personal preference will have a major influence. also how serious, fun track or competion track? don't forget you don't need mammoth power on circuit and you also don't spend much time at low revs but the tighter the track the more important throttle respose becomes. if it's definately not for the road then go for big cams and a medium size compressor (67mm) with a medium sized exhaust ar (around the .8 mark) and keep it above its boost threshold. having said that, personally i'd still probably go for a smaller compressor. Link to comment Share on other sites More sharing options...
Alex Posted December 1, 2005 Share Posted December 1, 2005 What are the gear change RPM drops on an Auto? With a 3600stall does it never drop below 3600? Sorry don't use them not quite sure how they go. Thinking about it, it's all down to the stall converter. Get a turbo that matches it's boost threshold to the TC's stall. Link to comment Share on other sites More sharing options...
chilli Posted December 1, 2005 Share Posted December 1, 2005 The second of the two videos in this thread http://www.mkivsupra.net/vbb/showthread.php?t=52965 - This car seems really well set up for the track, listen to his power delivery, seems well smooth and progressive with no lag problems - anyone know what this car was running? Not sure it was making massive power, looks well set up for that type of track though! Link to comment Share on other sites More sharing options...
Dave S Posted December 1, 2005 Share Posted December 1, 2005 what happens to 'engine braking' with a hi stall TC ? Link to comment Share on other sites More sharing options...
GeordieSteve Posted December 1, 2005 Share Posted December 1, 2005 Personally with an auto I'd go with the new 71dbb... but then again I'm biased Link to comment Share on other sites More sharing options...
Wez Posted December 1, 2005 Share Posted December 1, 2005 Which is the best Turbo for the track ? If you go too small, will you build up too much heat and have cooling issues ? Heat should only be an issue if you had a large FMIC and were running the turbo out of its effeciency range. Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 1, 2005 Share Posted December 1, 2005 I wouldn't go single on an auto at all, just IMO. The gearbox is effectively mapped to match stock engines power and torque delivery, and is not re mappable, or at least not by mortals. If you DO decide to go ahead use a small turbo, but then what's the point when MrT has provided millions of R&D perfecting a similar set up that you already have? My single turbo Skyline, on a Power FC, drives to my satisfaction, 90% of the time, I COULD get the mapping better, but an engine swap is imminenet, and it's going on a Motec, so I won't be wastig too much time fiddling, but believe me, getting a simple conversion like this to its current level ahs taken a LOT of time and money, and I don't include my time in the budget! People will laugh, shout, complain and mock, but, IMO, a worthwhile single conversion, on a stock car, including suitable ancillary stuff, fitted by someone you pay fair labour and mapping fee to, would come in over 15K. 20K maybe if you want a few bells and whistles. A mega job, say a genuine 800 BHP car, done right, easily 50K plus. All on top of a base car in good nick. Link to comment Share on other sites More sharing options...
chilli Posted December 1, 2005 Share Posted December 1, 2005 for an excellent track car, wouldn't spending more cash on brakes, suspension, wheels and tyres etc pay of with quicker lap times and getting the stock engine up to max performance circa 400 - 450 bhp which on a well set up car is still going to make it very quick! The car in that video I mentoned above, lovely power delivery but look at it's braking and handling, thats where the real time is being won! Link to comment Share on other sites More sharing options...
Alex Posted December 1, 2005 Share Posted December 1, 2005 Probably...I expect Peter has this covered though. The question is which turbo, not how can I make it faster round the track, or how much should I spend on fitting a single kit. I have a feeling Peter is going about all this the right way. Link to comment Share on other sites More sharing options...
Gaz Walker Posted December 1, 2005 Share Posted December 1, 2005 The GSC car in the video has a 67 - works nicely on the track! Gaz. Link to comment Share on other sites More sharing options...
Ian C Posted December 1, 2005 Share Posted December 1, 2005 Can't beat a T67 with a big stick You get a monster amount of power out of it and the spool time isn't that disasterous. I can't wait to see if the cars' xmas pressie makes a difference (the DBB version of the turbo). I use mine as a street weapon and it's brilliant. Don't need any more power, and can live with the lag. It'd probably be great on a track as well, if I wasn't such a coward, because over 4000rpm it's pretty much instantoboost -Ian Link to comment Share on other sites More sharing options...
Syed Shah Posted December 1, 2005 Share Posted December 1, 2005 A 61-67 sized turbo. And to cure the auto problem CW is concerned with, a reverse manual valvebody + raised stall. Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 2, 2005 Share Posted December 2, 2005 Have you found somewhere that does manual valve bodies for the auto box? Link to comment Share on other sites More sharing options...
Syed Shah Posted December 2, 2005 Share Posted December 2, 2005 A place in Oz does one for the Soarer box, I'd imagine they do it for the Supra box too (very similar). I *think* a new company is the USA is offering them too. It is the way forward IMHO, benefits of both. Can find some links for you if you wish Chris. Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 3, 2005 Share Posted December 3, 2005 If it's noyt a lot of trouble I'd be very interested in this, it would simplify a Motec jobbie on wild auto box cars, for sure, and be far better than a malconfigured ecu controlled one. Link to comment Share on other sites More sharing options...
Syed Shah Posted December 6, 2005 Share Posted December 6, 2005 MV Automatics Contact: Michael Vidau Address: Unit 3/1 Stirling Road, Blackwood, SA, 5051. Phone: (08) 8370 0430 That is the company that do it in Australia for the Soarer gearbox. I am still trying to confirm the company in the US can do it. If not, there is always the TH400 option, though it seems to have nasty tranmission losses through it. Link to comment Share on other sites More sharing options...
Andy-No-Knee Posted December 6, 2005 Share Posted December 6, 2005 I have just had one delivered, and as far as I can make out, the manual conversion is removing the spings in the valve body channel for each gear and replacing them with copper pipes cut to size. Link to comment Share on other sites More sharing options...
Syed Shah Posted December 6, 2005 Share Posted December 6, 2005 Well from what I have read, the Supra box (so probably Soarer box too) has some kind of manual valvebody as a backup already. So are you going for their stage 2? Any more details for us Andy? Cheers Link to comment Share on other sites More sharing options...
Andy-No-Knee Posted December 6, 2005 Share Posted December 6, 2005 Stage 1.5, but it is getting looked at by some people who may be able to make it even better before it goes in. Wont say any more at the moment, cat and sack and all that! Link to comment Share on other sites More sharing options...
TimH Posted December 6, 2005 Share Posted December 6, 2005 rather newbie question (sorry) but couldn't you use a smaller turbo to spool up a T67 (or bigger) so lag isn't so much an issue? I'm sure it would have been done if so but I've always wondered why people don't do this. Link to comment Share on other sites More sharing options...
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