JMB Posted November 13, 2011 Share Posted November 13, 2011 Hi all, I read lot s of thing about this mod, who did it ? I Know lot s of twin turbo cars (Porsche for exemple) have true twin turbos unlike the supra... Advice needed Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted November 13, 2011 Share Posted November 13, 2011 Its rubbish. I did it last year Exhaust will sound louder lower revs but no boost and there isn't much (if any) feel in difference hi end. All it down is have the 1st turbo wastegate open low revs and closes up about 3kish.. Quote Link to comment Share on other sites More sharing options...
shaky Posted November 13, 2011 Share Posted November 13, 2011 Have a look at this link,http://www.mkivsupra.net/vbb/showthread.php?128930-True-Twin-Turbo-Conversion&highlight=True+twin+turbo+conversion Quote Link to comment Share on other sites More sharing options...
Abz Posted November 13, 2011 Share Posted November 13, 2011 TTC Mode? Few people on the forum have done this, though more to test the turbo's etc. Only thing this does as mentioned above is just bring both turbo's online at the same time. Quote Link to comment Share on other sites More sharing options...
Kirk Posted November 13, 2011 Share Posted November 13, 2011 There are certain advantages of running it this way, the first being taking the stress off the number one turbo by having them both coming on at the same time, the second being the much more linear power delivery, its a lot smoother IMO and of course you all get slightly better fuel economy. It does come at a price of spool though as you wont see full boost till around 4k revs. Its probably not ideal for auto's to be honest, you need a manual to overcome the lag really. It would also be ideal to run a piggy back to cure the fueling issue's and make the most of the setup. That's my 2 pennies on the subject anyway Quote Link to comment Share on other sites More sharing options...
Westy Posted November 13, 2011 Share Posted November 13, 2011 Fuel economy at the cost of spool...why have a Sup if that's what your after!? Quote Link to comment Share on other sites More sharing options...
Kirk Posted November 13, 2011 Share Posted November 13, 2011 Clearly you didn't read the other advantages it has as well seeming the only thing you picked up on was fuel economy at slight cost of spool Quote Link to comment Share on other sites More sharing options...
boomstick Posted December 1, 2011 Share Posted December 1, 2011 There are certain advantages of running it this way, the first being taking the stress off the number one turbo by having them both coming on at the same time, the second being the much more linear power delivery, its a lot smoother IMO and of course you all get slightly better fuel economy. It does come at a price of spool though as you wont see full boost till around 4k revs. Its probably not ideal for auto's to be honest, you need a manual to overcome the lag really. It would also be ideal to run a piggy back to cure the fueling issue's and make the most of the setup. +1 I have an auto + TTC, but we did the extreme TTC by following the secret sauce link:http://www.supraforums.com/forum/showthread.php?199001-MTR-s-TTC-secret-sauce-mods....pics&highlight=secret+souce TTC lag is overrated imo (but also very subjective ). The only time you will notice it is on WOT after you have come to a complete stop. When cruising around, boost is available 1 or 2 gears down Next year (feb/march) we are doing a manual conversion and I will post de dyno figures. The following is part of the 'TTC secret sauce mod' and removes all butterflies between the twins and exhaust, which had def. made a big difference: 1. #2 Turbo Pipe Mod - remove the butterfly in the pipe coming off the second turbo. Then take a digrinder and remove the aluminum arc that went around that butterfly. Also get the hole where the bullerflys rod came out of the side welded up. Now another thing that you can do is take the middle plate with the openings in it and swap it out with solid piece that you can make out of 1/8 inch aluminum. This is the piece in the picture with the gaskets and crappy blue sealant on it. This plate that goes on top that makes it so the air doesnt have to occupy the extra area in the upper part. Also makes things less turbulant. 2. EGCV Mod - Take out the stock EGCV butterfly and replace it with a straight through design. You can just take a screwdriver with a hammer and bash out the butterfly but that leaves the rod which I also wanted removed. The reason why you need to make an entire new piece is because the stock one is made of ceramic. And since you can't weld ceramic, you would have two large holes in your exhaust. I made mine myself on a lathe out of a piece of temp resistant steel. This will increase the crosssectional area of the #2 turbos exhaust by over 30%. Kinda a pain to install but I found it to be worth it. Quote Link to comment Share on other sites More sharing options...
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