Guest supra&starlet Posted June 12, 2014 Share Posted June 12, 2014 quick question gentlemen. I have installed a speed for sale BCC (same as greddy BCC) on a 1994 JDM twin turbo supra automatic. I have installed it using the instructions you guys have provided. My problem is that i cannot seem to find the sweet spot by adjusting the voltage on the BCC to get it to stop hitting fuel cut. I turned it counter clock wise all the way and the car shut off. I turned it clock wise all the way and it would hit fuel cut at 4000 rpms and would not pass 4000rpms. I have it adjusted somewhere in the middle, and it hits fuel cut at 4000rpms then 4500rpms then 5200rpms and finally it shifts at redline. It keeps getting inter-upped by the fuel cut. I had a voltage meter and i kept measuring the voltage on the green wire and it always read 1.36V no matter how many turns i did counter clock wise or clock wise. Help I'm running out of ideas here Quote Link to comment Share on other sites More sharing options...
Ric Posted June 12, 2014 Share Posted June 12, 2014 Fuel cut is trigged by the amount of boost, not revs, even though i understand they would be related, Fuel cut is triggered by more than 1bar of boost over 3 seconds or so. Pay your membership. Quote Link to comment Share on other sites More sharing options...
Guest supra&starlet Posted June 13, 2014 Share Posted June 13, 2014 ok, so in this case how do i eliminate the boost cut so the car can just rev nicely and un-interupped till redline. Also the car has a RUSH anti lag system, so I'm wondering if this is interfering because the other day it shot two big flames out the exhaust and the car is only bpu Quote Link to comment Share on other sites More sharing options...
Pig Posted June 13, 2014 Share Posted June 13, 2014 Anti-lag system... Stock twins... NOT a good idea. You need to but a fuel cut defender as that will remove fuel cut. Don't run over 1.2 bar on stock twins as 1. They will blow 2. There is no benefit after 1.2. I have assumed you are in a J spec not UK. Quote Link to comment Share on other sites More sharing options...
Guest supra&starlet Posted June 13, 2014 Share Posted June 13, 2014 Anti-lag system... Stock twins... NOT a good idea. You need to but a fuel cut defender as that will remove fuel cut. Don't run over 1.2 bar on stock twins as 1. They will blow 2. There is no benefit after 1.2. I have assumed you are in a J spec not UK. The other supra forum has told him as well that the anti lag system is an extremely bad idea on a stock twin turbo supra. Anyways. It is not my car, however he had a shop do a bunch of installs on the car to make it bpu, and they have messed up on everything possible. 1. BCC was installed in-correctly 2. Boost controller was installed in-correctly 3. They installed twin intake kit and left all the VSV sensors hanging in the engine bay 4. Im guessing they installed the rush anti lag incorrectly as well. I am basically starting over with his car and fixing all the stupid mistakes. We have been playing with the boost around 0.6 BAR and it still has boost cut like crazy, can't get rid of it at those boost level's. And sometimes when he is accelerating to redline like i said it will spit flames and the engine will retard timing, and it acts all weird. So thats why i want to disconnect the rush anti lag and start over with the voltage screw on the BCC Quote Link to comment Share on other sites More sharing options...
Pig Posted June 13, 2014 Share Posted June 13, 2014 So thats why i want to disconnect the rush anti lag and start over with the voltage screw on the BCC That is the best place to start - Get everything off it. Once it is performing correctly as stock put 1 thing on at a time. Good luck. It is possible for a BPU to spit flames at the rev limit but pretty rare. I suppose it depends on exhaust choice to a certain extent. Quote Link to comment Share on other sites More sharing options...
Whitesupra95 Posted June 13, 2014 Share Posted June 13, 2014 Take the bcc off and bench test it. Connect the live to the battery and the earth to an earth, next take the wire going to your map sensor and connect it onto the battery live too. You should be left with one wire hanging. Take a multimeter and check how much positive voltage is coming out of that wire. Should be set to 4.39v or a little less. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.