Matt H Posted February 22, 2007 Share Posted February 22, 2007 im no expert but if a company like porshe have only just cracked it and its not like VGT's are avaliable from the shelf, how does joe bloggs stand a chance of producing anything for a supra in his garage? Is it just me or is this idea a bit looney? Quote Link to comment Share on other sites More sharing options...
dandan Posted February 22, 2007 Share Posted February 22, 2007 You don't see Porsche kicking out 600bhp+ from 3 litres either but that doesn't stop enthusiasts from doing it. Reliability and maintenance are viewed very differently OEM vs aftermarket. I could probably live with a turbo stripdown every 10,000miles as I don't do that many in a year in the Supra. Those turbos on the Porsche would have to function perfectly after xxx,000 miles. Depends on the usage of the car as to what is viewed as acceptable. Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 27, 2015 Share Posted August 27, 2015 Rise from the dead thread !!!! just giving this a bump to see if this can be done as the tec is a fair few years older T4 manifold fitment? Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted August 27, 2015 Author Share Posted August 27, 2015 Ryan G did it with a V8 Supra IIRC. Made around 600bhp. Not sure what happened to it. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2015 Share Posted August 27, 2015 BorgWarner produce the Porsche variable turbos, you can modded units now by looks of it :- http://www.full-race.com/store/turbos/borgwarner-airwerks/borgwarner-bv50-vtg-turbo.html Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 27, 2015 Share Posted August 27, 2015 BorgWarner produce the Porsche variable turbos, you can modded units now by looks of it :- http://www.full-race.com/store/turbos/borgwarner-airwerks/borgwarner-bv50-vtg-turbo.html Over $5k wow nice and cheap then Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2015 Share Posted August 27, 2015 Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 27, 2015 Share Posted August 27, 2015 been trying to find ones to buy off the shelf from the various makes of these , there is a supra with a HE351VE but that info is on suprforums and i cant go on it at work to find out more information , question why is it so hard to find these types of turbos to buy when we all know they are made ? Quote Link to comment Share on other sites More sharing options...
mattdavies Posted August 27, 2015 Share Posted August 27, 2015 been trying to find ones to buy off the shelf from the various makes of these , there is a supra with a HE351VE but that info is on suprforums and i cant go on it at work to find out more information , question why is it so hard to find these types of turbos to buy when we all know they are made ? If you Read Ryan G build thread for the V8 I am pretty sure he had trouble with the turbos boosting due to the requirements in back pressure, they are not a simple design therefore I think they need a certain type of set up. But then again I might be chatting utter rubbish Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted August 27, 2015 Share Posted August 27, 2015 Just unnecessary added cost and complication IMO. Match a modern billet wheel turbo to your needs and it will be perfectly responsive. Some of the little DBB turbos now made can be a little too responsive! Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2015 Share Posted August 27, 2015 Just unnecessary added cost and complication IMO. Match a modern billet wheel turbo to your needs and it will be perfectly responsive. Some of the little DBB turbos now made can be a little too responsive! sounds like a lot more bits that can go wrong, I am all for keeping it simple Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 27, 2015 Share Posted August 27, 2015 Just unnecessary added cost and complication IMO. Match a modern billet wheel turbo to your needs and it will be perfectly responsive. Some of the little DBB turbos now made can be a little too responsive! true I did find a video compairing a precision 6266 vs 84 efr and there was only 70 rpm differenec in spool Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted August 27, 2015 Author Share Posted August 27, 2015 Interestingly, the new Mercedes-AMG GT 4.0-litre "hot-V" V8 engine uses two mono-scroll conventional compressors. Doesn't feel like it has any lag at all. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 28, 2015 Share Posted August 28, 2015 Porsche have had a lot of warranty issues with thi VNT turbos, all apparently heat related. They work well on hard driven diesels with their MUCH lower EGT's. But drive a VNT diesel around town all the time and the variable vane mechanism carbons up and seizes... Ryan.s issue was the turbo turbine exit area was far too small even with the vanes fully open. Made huge low end boost, but uncontrollable once the engine started giving a lot of exhaust gas flow, huge back pressure generated. All from memory. basically the turbos had too small an exhaust housing for the application. High CR turbo petrol engines with direct injection, and modern turbos with the exhaust housing cast into the manifold mean VNT technology is not so special. You can get near zero lag. What the VNT will do is perhaps maximise efficiency across a broad RPM range, I am sure metallurgy will allow this soon. The gains in road car turbo technology from F1 running turbos doesn't seemed to have materialised, sadly. They seem more into remote drive of the compressor for aero packaging reasons. Quote Link to comment Share on other sites More sharing options...
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