Wez Posted May 16, 2002 Share Posted May 16, 2002 Hello, I just called fensport and asked them about there blue printed replacement stock turbos, the guy on the phone said they are based on the factory CT26 turbos, are these the stock turbos for a UK spec supra and will they just bolt onto a J-Spec. I believe that the J-Spec supra has two CT12`s turbos not CT26`s is this true? The modded CT26 turbos from fensport are about £550 I think. Also has anyone ported there wastegate on a J-Spec supra to solve the boost creep issues when removing both cats? Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 16, 2002 Share Posted May 16, 2002 Jesus, that is very poor from Fensport. You did tell them that you had a MKIV Supra didn't you ? They are usually very good. CT26 = MKIII Supra Turbo (and a few other cars) CT12(B)=MKIV Supra TT You would struggle big time to fit a CT-26 on a MKIV. Quote Link to comment Share on other sites More sharing options...
Wez Posted May 16, 2002 Author Share Posted May 16, 2002 Thanks for the info, it was a very brief phone call Quote Link to comment Share on other sites More sharing options...
Wez Posted May 16, 2002 Author Share Posted May 16, 2002 Sorry guys, just another quick question, do you know what model the stock turbos are on a UK spec? Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 16, 2002 Share Posted May 16, 2002 CT12. Confused you should be. I'm not sure whether the B on the end designates the turbo's as jap spec. Anybody ? Quote Link to comment Share on other sites More sharing options...
Adam W Posted May 17, 2002 Share Posted May 17, 2002 I've just got a hybrid for my Mk3 (arriving today, yippee!), and I paid just under £700 for it all in from Turbo Technics. Identical spec turbo from Fensport was about a grand . . . good company but don't buy turbos from them! Especially if they are expensive *and* they don't know what they are talking about! Quote Link to comment Share on other sites More sharing options...
badtoy Posted May 17, 2002 Share Posted May 17, 2002 hope this helps. does anyone figure out the specs of a hybrid stage 3 ct12b?????? that would be very very interessting...... Sequential Turbo's CT12B(Japanese) Turbine Size 60mm/48mm (big/small end of same blade) Compressor Size 62mm/39mm (big/small end of same blade) Turbine material Ceramic Scroll area (mm^2) 600 A/R ratio 0.42 CT12B(export) Turbine Size 52mm/44mm (big/small end of same blade) Compressor Size 58mm/39mm (big/small end of same blade) Turbine material Steel Scroll area (mm^2) 740 A/R ratio 0.53 P.S.: Source go to Specs on top of the page Quote Link to comment Share on other sites More sharing options...
Wez Posted May 17, 2002 Author Share Posted May 17, 2002 Thats great info cheers Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 17, 2002 Share Posted May 17, 2002 I have modded the sequentials to parallel operation and used the prespool valve as a second wastegate. PITA to do, but works fine. You lose the sequential operation of course... It is possible to enlarge and gas flow the stock wastegate a BIT, but it is only a bit. Never bothered as i doubt it will make sufficient difference to be worthwhile, but i may be wrong. No harm in trying. Quote Link to comment Share on other sites More sharing options...
paulrenn Posted May 17, 2002 Share Posted May 17, 2002 Chris, et al A friend told me that he had converted to parallel "true twin turbo" mode, and that the point at which the turbos start boosting had risen to around 4000 RPM from 2800. Can you verify this, and how would you rate the car for "street" use as opposed to track in this configuration? I have read that you cannot control boost on the Supra once you fit a catless downpipe, and wondered about the stock wastegates. I guess that the CT12 turbo uses an internal W/G design, as my turbo'd Celica's stock CT26 did. How larger can the stock W/G go? Is there a housing that would allow us to use an external W/G? I consider restricting the exhaust just to get decent boost control is rather a work-around than a solution. Thanks for any info... Paul Quote Link to comment Share on other sites More sharing options...
HedgehogSandwich adi Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by Wez Sorry guys, just another quick question, do you know what model the stock turbos are on a UK spec? I think the 'B' is just the progression from the CT12 'A' which is what is fitted to the earlier 2.5 twin turbo. adi Quote Link to comment Share on other sites More sharing options...
Alex Posted May 20, 2002 Share Posted May 20, 2002 Originally posted by paulrenn Chris, et al A friend told me that he had converted to parallel "true twin turbo" mode, and that the point at which the turbos start boosting had risen to around 4000 RPM from 2800. Can you verify this, and how would you rate the car for "street" use as opposed to track in this configuration? I have read that you cannot control boost on the Supra once you fit a catless downpipe, and wondered about the stock wastegates. I guess that the CT12 turbo uses an internal W/G design, as my turbo'd Celica's stock CT26 did. How larger can the stock W/G go? Is there a housing that would allow us to use an external W/G? I consider restricting the exhaust just to get decent boost control is rather a work-around than a solution. Thanks for any info... Paul Errr...the 2,800rpm is when T1 would come on line in sequential operation. In twin operation the SHARE that same volume of intake and exhaust gas. Because it is shared it takes longer to spool the two instead of spooling one then the other. God I'm bad at explaining this stuff... Anyway with True Twin Mode you will NOT get boost till after 3,500RPM Quote Link to comment Share on other sites More sharing options...
paulrenn Posted May 20, 2002 Share Posted May 20, 2002 Hi Alex Yeah, that's right, I'm just wondering how "driveable" that makes it; I mean, it might be intolerable for normal street use. On the track its a different matter, as you are (or should be) keeping the car in the higher rev range anyhow. Quote Link to comment Share on other sites More sharing options...
Alex Posted May 20, 2002 Share Posted May 20, 2002 The fueling for starters has to be adjusted as the ECU still thinks the 1st turbo comes on line at 2,000rpm+ It will run rich till the two turbo's get up to speed. As for drivability yes it will be more lethargic at low revs but with TT mode you get full boost off of BOTH Turbo's...and you will get more topend power. Though there are other methods of getting more power out of T1...not through a Boost Controller. Have a look at the Dyno Chart thread started by Eyefi http://supra.highspeedhostinggroup.net/public_html/vbb/showthread.php?s=&threadid=7 Quote Link to comment Share on other sites More sharing options...
Syed Shah Posted May 21, 2002 Share Posted May 21, 2002 I thought it gave no power gain, and was just better for the tirbos? Thats what everyone says on supraforums. Quote Link to comment Share on other sites More sharing options...
badtoy Posted May 21, 2002 Share Posted May 21, 2002 I made some test with my gtech a year ago, seq vs ttc mod. there was no diffrence in top end power at all. I was on the dyno and tried the ettc (mkiv.com tech articles) mod vs seq no power gain. You will gain some power when you remove your exhaus gas control valve. thats the most restrictions in the system. if you remove this egcv you have to assimilate the egcv pipe to the dimension of the exhaust pipe from turbo #1. try the ettc mod it costs only the switch and about 20 min work. you will find it at mkiv.com tech articles. markus p.s.: nobody with hybrid spec here? I would like to compare them with the factory specs...... Quote Link to comment Share on other sites More sharing options...
Syed Shah Posted May 21, 2002 Share Posted May 21, 2002 Barry and Gavin have hybrids, you could also try Leon for the exact specs. Quote Link to comment Share on other sites More sharing options...
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