Silece2k6 Posted March 23, 2011 Share Posted March 23, 2011 Hello. I have a little problem with my Supra. At full throttle, the car stutters or jerks scary. But if I give three quarters gas, it runs through smoothly. The spark plugs I yesterday also renewed, it has become something better. Setup: 2JZ (Jspec) with Decat and 100cpi Sportcat. Trd Exhaustor.hks ssqv and k&n Filter I tried at 2nd and 3rd Gear and the 1st Turbo do 0,7bar and at 4.000rpm the gauge pulls up to 1,4bar -.- May I equip my Car with à Apexi BC? I still Wrote in my "hello" Treat about my Problem with Engiene Lamp, so that the boost pressure is too high, that the fuelcut activated. Atm i drive Slow down to Safe the twins and engiene. Link to comment Share on other sites More sharing options...
Nic Posted March 23, 2011 Share Posted March 23, 2011 Is it a J-spec 2JZ-GTE or a European 2JZ-GTE? 1.4bar is too high for the stock turbos, 1.2bar max. A boost controller can only raise the boost, it cannot lower boost. The usual reasons for misfire at high boost is either worn spark plugs, the wrong spark plug heat range or broken coil pack connectors. How To: Refurbish coil pack connectors FAQ: Spark plugs Link to comment Share on other sites More sharing options...
Silece2k6 Posted March 23, 2011 Author Share Posted March 23, 2011 Damn it looks like I've got the wrong Plugs.NGK -Laser Platinum - BKR5EP-11 (3440) They are for Stock Not for boosted up to 1,2bar. But i will check the coil pack connectors, too Link to comment Share on other sites More sharing options...
Paul Whiffin Posted March 23, 2011 Share Posted March 23, 2011 Damn it looks like I've got the wrong Plugs.NGK -Laser Platinum - BKR5EP-11 (3440) They are for Stock Not for boosted up to 1,2bar. But i will check the coil pack connectors, too If it's not the coil pack connectors next port of call is the coil packs, seeing a lot of them failing now due to old age. Supersparks are very good value for money. Link to comment Share on other sites More sharing options...
CanisLupus Posted March 24, 2011 Share Posted March 24, 2011 Do you have a Fuel Cut defender? If not it will cut every time you go over 1.0bar. Also by your description you don't have a Restrictor ring and the 100cpi Cat is not enough to keep the boost down. Does it stutter on first turbo with full throttle? Link to comment Share on other sites More sharing options...
nevins Posted March 24, 2011 Share Posted March 24, 2011 Judging by what he has said he has added parts to the car which has let the boost creep and the fuel cut is activating. Last line of the op says the fuel cuts kicking in. Link to comment Share on other sites More sharing options...
Silece2k6 Posted March 24, 2011 Author Share Posted March 24, 2011 When I got the car, no Cat was installed. I've installed a new 100 cell to 550hp. The 1 loader runs without problems under full throttle from 0.65 to 0.7 bar. Only from 4.000rpm captures the stutter when the display shows 1.2 or 1.4 bar so much too much boost pressure. A restrictor ring and FCD I did not. But if I go three-quarters of gas to 1.0 bar then everything's working Fine Link to comment Share on other sites More sharing options...
Dnk Posted March 24, 2011 Share Posted March 24, 2011 Fit a 1 bar restrictor ring, boost controller to raise the boost to 1.2 bar max on j spec turbo's and an FCD to remove fuel cut and you'll be sorted. Link to comment Share on other sites More sharing options...
johnny g Posted March 24, 2011 Share Posted March 24, 2011 Fuel pump and fuel filter ok? Link to comment Share on other sites More sharing options...
Silece2k6 Posted March 24, 2011 Author Share Posted March 24, 2011 Where to get the R-Ring? I think the Pump and Filter are ok Link to comment Share on other sites More sharing options...
Nic Posted March 24, 2011 Share Posted March 24, 2011 Damn it looks like I've got the wrong Plugs.NGK -Laser Platinum - BKR5EP-11 (3440) They are for Stock Not for boosted up to 1,2bar. But i will check the coil pack connectors, too That will be the problem, NGK 5 heat range plugs will definitely cause misfire at 1.2bar. Link to comment Share on other sites More sharing options...
Nic Posted March 24, 2011 Share Posted March 24, 2011 Where to get the R-Ring? I think the Pump and Filter are ok Contact Paul Whiffin above. Link to comment Share on other sites More sharing options...
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