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I have 272s and a 61mm with the .86 hot side in my 1j. it is a great driver with plenty of power for cruising around town.

sounds so rowdy! your car has a much more pronounced lopey idle compared to my car.

I think you should just bypass the stock fuel filter and put in a temporary inline filer. I would hate to see you ruin your motor by letting some debris come in through the fuel system. come back to get the toyota fuel filter sorted once you have the motivation from your car that runs well.

have you looked into your idle speed controller or the dashpot at all? do you have an aftermarket BOV vented to atmosphere?

the ECU did not solve my problems. so i ended up digging through my boxes of supra parts I have collected over the last 10 years and found a map sensor. plugged it in, and had to totally re do my SAFC settings! this is good news. Went and drove the car end had to take out loads of fuel in...

just to close the loop on this idiotic thread I plugged the AT ECU in and my MT ecu and harness car fired right up and drove. the breaking up issue has gotten better, but it still feels like I have weak spark above 5000 rpm.

hey there everyone. I am excited to try a different ECU in my car, but I ended up i with an AT ecu for my MT car with MT 1jz harness. I have searched here and SF for the neutral safety switch mod and I could not find anything conclusive for the MT harness. Can anyone share what I need to do...

lame to get ripped like that. at least you figured it out pretty quick.

do you have any stock injectors around?

i will look into the voltage at the fuel pump I assume it should be ~ 12v?. I just bought an AT jza70 ecu. hopefully that fixes my issue. I understand all I need to do to get this ecu workign is to jumper the neutral safety start wires?

have you jumpered for codes?

right on I have never thought of that. I think im going to get out the soapy water just to be sure I don't have any exhaust leaks.

you will need to wire in a resistor pack from a 7mgte or a MKIV ( I have the 7m one in my car) here is a very simple wiring diagram that I used to wire in my 550s here is a thread on suprafrums that discusses the topic...

i just replaced the sensor in my wideband last week just to be sure it was accurate. It is mounted about a foot from the turbo (not my idea I like them much further away) so the only way an exhaust leak would occur would be at the V band. I just checked the V band, and its solid. thank you...

thank you for an excellent post. I have the stock fuel regulator. My only fuel mods are 550s, and MKIV pump. I will look into my base fuel pressure. My AFs are in the high 11s right before break up. So I think the AF is not the source of my problems, but the fuel map (or lack there of) in...

thank you!!! I was looking for the CEL when I was having the issue and it was not showing up. so I think its safe to say fuel cut is out. can anyone on 550s and SAFC II comment on their fuel adjustments? I am going to test coil packs this weekend with a known good set. If that fails to...

When I jumper in the diag. box the CEL just blinks with no pauses, I believe that means there are no codes. After doing some searching it seems like the CEL would come on if I was hitting fuel cut, so I can rule that out. I would really like to hear some other people chime in with their...

EDIT ** fuel dampener is on my car and it will not rev past 4500 in boost. at less than WOT it will rev high. AF does not get over 12:1 in boost

I believe that I do. But0c can you describe it?

Here is some info on my car 1jz pt 61 turbo @ 9psi crower 272 small core cams 550cc injectors MKIV fuel pump safcII New copper NGKs gaped @ .024 AEM wideband with brand new sensor No codes when jumpered. The problem is a break up @ 4500 rpm. Which is right when I need to start adding serious...