Jellybean Posted October 31, 2013 Share Posted October 31, 2013 What is need for TTC? 650 injectors Cams Standalone ECU Walbro 255L Fuel pump suffice or higher flow rate? Stock Airbox and Panel Filter The next stage is a single conversion Is it problematic to have too large of an injector, for future proofing: Something along the lines of a GTX35R Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 31, 2013 Share Posted October 31, 2013 TTC means true twin conversion dude , being runing both sequential turbos at the same time which needs nothing but best with a mapping or at least a safc but for a single you dont need cams , and you could fabricate a pipe to the air box to retain it , intercooler piping , fuel lines, fule rails, fpr, covered 100's of times Quote Link to comment Share on other sites More sharing options...
Jellybean Posted October 31, 2013 Author Share Posted October 31, 2013 TTC means true twin conversion dude , being runing both sequential turbos at the same time which needs nothing but best with a mapping or at least a safc but for a single you dont need cams , and you could fabricate a pipe to the air box to retain it , intercooler piping , fuel lines, fule rails, fpr, covered 100's of times Have the flu coming on , yeah true twin conversion I am nearly sure you need larger injectors running the turbos in Parallel as the Jspecs are maxed out on 100% Duty cycle. Single turbo? I was asking about implications of having bigger injectors than what is required, for future proofing. I used the GTX35r as an indication for my power needs long term; makes better financial sense to buy an injector to suit my long term goals, 650cc injector may suit TTC mode but might be on its limit with a GTX35r, but a 850cc injector will suit both without any implications Quote Link to comment Share on other sites More sharing options...
mattdavies Posted October 31, 2013 Share Posted October 31, 2013 There would be no real problem running a 650cc injector for future proofing and with TTC your right your near the limit so bigger injectors would be safer and probably more reliable fueling Quote Link to comment Share on other sites More sharing options...
DJT88 Posted October 31, 2013 Share Posted October 31, 2013 I have no problems running TTC for a while now... I have stock jspec injectors, but don't know if they are maxed out.. I don't think so though, because above 4000 rpm you would normally be in TTC anyway with the stock setup. edit: For future proofing it can be done, but I think you need a aftermarket ecu and mapping. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted October 31, 2013 Author Share Posted October 31, 2013 Just trying to gauge essential versus Nice to have; I presume a Fuel pulsation bypass is also a requirement Quote Link to comment Share on other sites More sharing options...
mattdavies Posted October 31, 2013 Share Posted October 31, 2013 The only requirement is something to control the fuelling as there is a very lean patch just before 4k Quote Link to comment Share on other sites More sharing options...
jcbt Posted October 31, 2013 Share Posted October 31, 2013 you cant just put in what size injector you want. If your wanting to change your fuelling in TTC mode then you are going to have to look at an aftermarket ecu and get it mapped- if your aiming to go single then you might as well go syvecs now and run it properly. Injector size is a personal choice but no point in going over 850,s unless your aiming for big power Quote Link to comment Share on other sites More sharing options...
Jellybean Posted October 31, 2013 Author Share Posted October 31, 2013 My list so far TTC mode-- Essentials 1) Aftermarket ecu and mapping is an essential to get the benefit What I need confirmation on is: 1) injectors , Jepecs need uprating 2) Fuel pulsation bypass to get max flow in the stock fuel system 3) 255l Walbro sufficent depending on if upgraded injectors are required Nice to Have but not-essential 1) Cams Quote Link to comment Share on other sites More sharing options...
Justin Bieber Posted October 31, 2013 Share Posted October 31, 2013 And to think all I did was swap a couple of hoses over..... No wonder my car is so slow!! Quote Link to comment Share on other sites More sharing options...
Scott Posted October 31, 2013 Share Posted October 31, 2013 My list so far TTC mode-- Essentials 1) Aftermarket ecu and mapping is an essential to get the benefit What I need confirmation on is: 1) injectors , Jepecs need uprating 2) Fuel pulsation bypass to get max flow in the stock fuel system 3) 255l Walbro sufficent depending on if upgraded injectors are required Nice to Have but not-essential 1) Cams None of that is essential for TTC. The benefit of the after market ECU and mapping isn't limited to TTC or especially beneficial to TTC, it's a benefit for any car IMO. However, if you want to absolutely maximise the TTC then I would look at the following: Syvecs & mapping - No point in messing around here, especially if future plans include Single. 255l Walbro - Plenty for anything up to the highest of BPU levels. Cam Gears - Always nice to dial in the timing mechanically. That way micro adjustments can be made with the map. I'd recommend going with this mod. Cams - There will be a bit to gain here, but I doubt it's going to be a LOT. Bigger cams come into their own at the upper end of the revs... which is just when your tubbys are running out of puff. Depending on how good your turbos are and how good your head is will have a lot of a say I would guess. The fuel pulsation bypass is a bit pointless at this level. I would recommend just leaving everything in situ as when you go single you'll just end up replacing the entire fuel setup anyway. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 31, 2013 Share Posted October 31, 2013 Never bothered with fuel pulsation bypass even when I went from TTC/hybrid to single turbo. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted October 31, 2013 Author Share Posted October 31, 2013 Never bothered with fuel pulsation bypass even when I went from TTC/hybrid to single turbo. I think alot of it is propaganda by the guys selling them, just trying to filter out what parts just lighten your wallet Some of the jargon, would lead you to believe you will end up sitting in the middle of the road playing with pieces of your engine like lego Only if I bought that 90 dollar part LOL - - - Updated - - - None of that is essential for TTC. The benefit of the after market ECU and mapping isn't limited to TTC or especially beneficial to TTC, it's a benefit for any car IMO. However, if you want to absolutely maximise the TTC then I would look at the following: Syvecs & mapping - No point in messing around here, especially if future plans include Single. 255l Walbro - Plenty for anything up to the highest of BPU levels. Cam Gears - Always nice to dial in the timing mechanically. That way micro adjustments can be made with the map. I'd recommend going with this mod. Cams - There will be a bit to gain here, but I doubt it's going to be a LOT. Bigger cams come into their own at the upper end of the revs... which is just when your tubbys are running out of puff. Depending on how good your turbos are and how good your head is will have a lot of a say I would guess. The fuel pulsation bypass is a bit pointless at this level. I would recommend just leaving everything in situ as when you go single you'll just end up replacing the entire fuel setup anyway. Thanks Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 31, 2013 Share Posted October 31, 2013 My list so far TTC mode-- Essentials 1) Aftermarket ecu and mapping is an essential to get the benefit What I need confirmation on is: 1) injectors , Jepecs need uprating 2) Fuel pulsation bypass to get max flow in the stock fuel system 3) 255l Walbro sufficent depending on if upgraded injectors are required Nice to Have but not-essential 1) Cams TTC can be accomplished without going overboard, I used, fuel pump upgrade (however I had already done this for BPU along with exhaust etc) Greddy EMU std injectors until I went hybrid turbos and then I went to UK 550cc even with a single turbo. I also removed all sequential gubbins and wired all the butterfly valves open. Cams will normally just shove the peak torque and BHP further up the RPM range, OK you may see extra power but you have to rev for it, I found that an adjustable pulley on the exhaust cam and advancing it by a few degrees helped power wise and where IMO a major influence on keeping EGT a lot lower. Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted November 1, 2013 Share Posted November 1, 2013 TTC Sucks unless you map the car to it. I did TTC on my BPU supra and there was less benefits. After cams and Ryan insisting going TTC with Syvecs it was bloody awesome.. Quote Link to comment Share on other sites More sharing options...
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