Mcgoo Posted August 16, 2006 Share Posted August 16, 2006 Hi all, I have a j-spec TT6 BPU with a 1.1bar restrictor ring. It only hits 1.1bar in 5th or 6th on a coolish day, 4th and below it hits between 0.8 and 1.0bar. I've got a track day coming up and would like to up the boost a bit for the day and for any other spirited days in the future So the question is will a manual boost controller or bleed valve do the job and if so which is best ? Will either of these increase the boost in the lower gears ? Your help would be much appreciated. Link to comment Share on other sites More sharing options...
wkdtime Posted August 16, 2006 Share Posted August 16, 2006 Mate go down the EBC route, You'll find with the MBC or blead valve the boost will spike in the higher gears (Higher loads) especially with winter round the corner. Link to comment Share on other sites More sharing options...
Justin Posted August 16, 2006 Share Posted August 16, 2006 Yes to that. Get an electronic one. Link to comment Share on other sites More sharing options...
Mcgoo Posted August 16, 2006 Author Share Posted August 16, 2006 Thanks for the reply guys, Thing is not that flush this month as I just got back from holiday. And not sure i could warrant spending that much for the amount of time i would use it. I'm actually reasonably happy with the 1.1bar i get for the every day drive to work. Just thinking about upping it a bit for the track and would like to see a bit more in the lower gears and on warm days. Link to comment Share on other sites More sharing options...
wkdtime Posted August 16, 2006 Share Posted August 16, 2006 Thanks for the reply guys, Thing is not that flush this month as I just got back from holiday. And not sure i could warrant spending that much for the amount of time i would use it. I'm actually reasonably happy with the 1.1bar i get for the every day drive to work. Just thinking about upping it a bit for the track and would like to see a bit more in the lower gears and on warm days. In that case i'd go MBC over blead valve, Blead valves are more prone to boost leaking where as the MBC (spring and ball) are not. Link to comment Share on other sites More sharing options...
Dave Henshall Posted August 16, 2006 Share Posted August 16, 2006 does the TT have any form of factory electronic boost control.... or is the wastegate actuator directly connected to the compresser housing and it just relies on the spring pressure in the actuator to determie the boost level....? Link to comment Share on other sites More sharing options...
Homer Posted August 16, 2006 Share Posted August 16, 2006 does the TT have any form of factory electronic boost control.... or is the wastegate actuator directly connected to the compresser housing and it just relies on the spring pressure in the actuator to determie the boost level....? Factory boost control is kept by the wastegate and/or back pressure. Release the backpressure on a Jspec car (via decat) and boost goes through the roof (too small wastegate). The UK cars have a larger wastegate so can keep it to near stock levels (Hence the need for a boost controller to raise boost). Regarding the orginal question, I've had no boost spikes at all using a bleed valve. However its obviously essential to keep air temps in mind - a drop from 28degrees to 20degrees sees a 0.2bar increase. Link to comment Share on other sites More sharing options...
Mcgoo Posted August 17, 2006 Author Share Posted August 17, 2006 However its obviously essential to keep air temps in mind - a drop from 28degrees to 20degrees sees a 0.2bar increase. Would this be the same with a mbc? surely if you set it to 1.2bar it will operate at 1.2bar regarless of temp? Link to comment Share on other sites More sharing options...
Dave Henshall Posted August 17, 2006 Share Posted August 17, 2006 so does the ecu have no way to limit boost if there is a probelm (limp mode equivilent) on an auto, is there a link to the auto box ecu to the engine ecu - is it a CAN type network? Link to comment Share on other sites More sharing options...
JohnA Posted August 17, 2006 Share Posted August 17, 2006 so does the ecu have no way to limit boost if there is a probelm (limp mode equivilent).. The ECU can and does pulse the VSVs mate. This controls the flow of pressurised air at the back of the actuators, which in turn affects when they move (and how much) The wastegate is linked to one of these actuators. Link to comment Share on other sites More sharing options...
wkdtime Posted August 17, 2006 Share Posted August 17, 2006 Would this be the same with a mbc? surely if you set it to 1.2bar it will operate at 1.2bar regarless of temp? Nope it wont, thats where EBC comes out on top because they constanly adjust the solanoid to keep the boost to the selected level. An MBC set at 1.2 bar will boost up 1.3+ in the higher gears due to the higher loads. Link to comment Share on other sites More sharing options...
Mcgoo Posted August 17, 2006 Author Share Posted August 17, 2006 [quote An MBC set at 1.2 bar will boost up 1.3+ in the higher gears due to the higer loads. Why is that? Is it because of the flow rates of the valve or is it more complicated than that? Link to comment Share on other sites More sharing options...
Ian C Posted August 17, 2006 Share Posted August 17, 2006 so does the ecu have no way to limit boost if there is a probelm (limp mode equivilent) on an auto, is there a link to the auto box ecu to the engine ecu - is it a CAN type network? The wastegate is controlled by a wastegate VSV so the ECU does in fact have some electronic control over it, it's not just spring pressure vs boost pressure. Of course there is still a minimum boost level, I don't know what it is as I don't think anyone has ever tried wirign the wastegate full open on a stock car. Limp home mode has a load of other features as well, such as pulling ignition timing and lighting a facking great red light up in the middle of the dash - if you still boost then, well, no ECU can stop idiocy There is a link between the autobox ECU and the main ECU, and it's a load of dedicated wires. No CANBus system here, it's too old for it (and hurrah say I as it's a nightmare for us home mechanics). -Ian Link to comment Share on other sites More sharing options...
Dave Henshall Posted August 17, 2006 Share Posted August 17, 2006 cool, Link to comment Share on other sites More sharing options...
Mcgoo Posted August 18, 2006 Author Share Posted August 18, 2006 I think i will give one a go. What do you think of these? Has anyone got one? http://cgi.ebay.co.uk/NEW-POWERTEK-BOOST-CONTROLLER-FOR-TOYOTA-SUPRA-TURBO_W0QQitemZ140017806959QQihZ004QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem http://cgi.ebay.co.uk/R-Spec-BOOST-CONTROLLER-KIT-FOR-TOYOTA-SUPRA-TURBO_W0QQitemZ160020431835QQihZ006QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem http://cgi.ebay.co.uk/BOOST-CONTROLLER-KIT-Turbo-MR2-SUPRA-CELICA-GT4-Starlet_W0QQitemZ250018299598QQihZ015QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem I'm thinking the first one because its nice and simple brass and s/steel. Can i please have some of your expert opinions. Link to comment Share on other sites More sharing options...
Wez Posted August 18, 2006 Share Posted August 18, 2006 I am running a Ball and Spring MBC at the moment, has too adjustments, one is for bleeding air off to increase boost, the other is the ball and spring which enables you to hold off air going to the wastegate to enable possibly faster spool. Currently mine is only setup to bleed air and as my dyno plots show the boost is rock solid, this has even proved true on the road, my boost gauge gas a peak hold function and its never gone past 1.4bar. Link to comment Share on other sites More sharing options...
Mcgoo Posted August 20, 2006 Author Share Posted August 20, 2006 I think i will give one a go. What do you think of these? Has anyone got one? http://cgi.ebay.co.uk/NEW-POWERTEK-BOOST-CONTROLLER-FOR-TOYOTA-SUPRA-TURBO_W0QQitemZ140017806959QQihZ004QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem http://cgi.ebay.co.uk/R-Spec-BOOST-CONTROLLER-KIT-FOR-TOYOTA-SUPRA-TURBO_W0QQitemZ160020431835QQihZ006QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem http://cgi.ebay.co.uk/BOOST-CONTROLLER-KIT-Turbo-MR2-SUPRA-CELICA-GT4-Starlet_W0QQitemZ250018299598QQihZ015QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem I'm thinking the first one because its nice and simple brass and s/steel. Can i please have some of your expert opinions. Bump;) Link to comment Share on other sites More sharing options...
Wez Posted August 20, 2006 Share Posted August 20, 2006 I am currently using this TurboXS one. Link to comment Share on other sites More sharing options...
Mcgoo Posted August 21, 2006 Author Share Posted August 21, 2006 Cheers Wez. Link to comment Share on other sites More sharing options...
INDYPWR Posted August 23, 2006 Share Posted August 23, 2006 i just changed my ebc to manual controller and it works like a charm! no problem here! i can hit 1.2 bar if i want to but with restrictor ring, i hit 1.0 consistently. Link to comment Share on other sites More sharing options...
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