goldenvtr Posted January 9, 2016 Share Posted January 9, 2016 (edited) Iv'e just fitted an uprated fuel pump in my na-t (i have tt ecu conversion for my single turbo setup), and before fitting i tested the voltage to the pump and it was only just over 8 volts. Now i know the TT's run at 9v then switchs to 12v but does the NA do this too? i believe na's have a different fuel pump ecu to the TT and was under the impression they run 12v constant but testing this says otherwise.... i didn't have a way to check to see if it switched to 12v at higher rpm but i am now debating the 12v mod and a new relay setup to control my new pump. another seperate note is at 4k rpm i suddenly go rich on my afr (low 10s) but only initially then it leans back to low.mid 11s, i assumed this is down to the ecu thinking the 2nd turbo is kicking in and that when i fit a piggy back this will then correct. thoughts and experiences welcomed Edited January 10, 2016 by goldenvtr (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 10, 2016 Share Posted January 10, 2016 This is why you need to invest in a proper mappable ecu, rather than fudging a TT one in, or a piggy back double fudging things. Quote Link to comment Share on other sites More sharing options...
TRD-1 Posted January 10, 2016 Share Posted January 10, 2016 I had this fuel pump issue on my NA Aristo, and yes they do run the same 8v and 12v setup as the TT, I personaly switched over to a TT fuel pump ECU, if yours is constantly only showing 8v your fuel pump ecu isn't working right, try a replacement or see if the TT one's fit. Regarding the 4k AFR issue, its gonna be the map on the stock ECU which is setup for the twins, and won't be suited to a single turbo, ideally u need a full standalone or at least a piggy back to get the fuelling and timing suited. Do you still have the stock distributor installed? Quote Link to comment Share on other sites More sharing options...
goldenvtr Posted January 14, 2016 Author Share Posted January 14, 2016 (edited) This is why you need to invest in a proper mappable ecu, rather than fudging a TT one in, or a piggy back double fudging things. i dont think i NEED to go full standalone with my currect setup, it woiuld be overkill ive done the 12v mod and put my emanage ultimate on now, ive leaned it back to mid/low 11s and seems to have gained a jump in torque im no newb when it come to tuning and i do appreciate a standalone ecu (i have a link ecu on my mx5 turbo and a omex 600 on my starlet) but being as the supra ecu is so flexible, the emanage ultimate with do exactly what i need to trim the fueling and tweak the timing for single turbo. I had this fuel pump issue on my NA Aristo, and yes they do run the same 8v and 12v setup as the TT, I personaly switched over to a TT fuel pump ECU, if yours is constantly only showing 8v your fuel pump ecu isn't working right, try a replacement or see if the TT one's fit. Regarding the 4k AFR issue, its gonna be the map on the stock ECU which is setup for the twins, and won't be suited to a single turbo, ideally u need a full standalone or at least a piggy back to get the fuelling and timing suited. Do you still have the stock distributor installed? ah thats good info, i did check that it switch to 12v with a log via my multimeter and it did, but ive wired in a new relay so its only 12v now:) im running vvti coils with tt ignitor. The distributor cap and leads are long gone , but using the original crank/cam triggers on the head, works perfectly Edited January 14, 2016 by goldenvtr (see edit history) Quote Link to comment Share on other sites More sharing options...
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