Thread: gtir miata swap help

need help gitr swap on a miata. the problem it leans out as soon as i get to boost, i have walbro fuel pump 37psi at idle, no air leaks tested to 20psi, i am using the stock ecu stock harnes. Im only runing o2 sensor, knock sensor, engine temp sensor, and maf sensor. I bypass the fuel pump to a switch so the ecu is not controling the relay at this point. The car starts and drive normal if i stay away from boost. im runing a zetronix wideband any help would be welcome

Wut? You have a gtir motor in an mx5??

yes, this forum helped me a lot but now im stuck and frustrated

Are you running stock boost levels? I think the easiest fix would be to get a tuneable ECU. This would allow you to make the adjustments you need. You could also try the Apexi AFC to make some adjustments as well.

Is that Walbro fuel pump a high pressure unit, or one meant for carbs?

You also seem to have a weak vacuum, if you're getting 37 psi fuel pressure at idle (assuming a 3-bar FPR). That equates to about 50 kPa at idle... That's weak...

i've try adjusting fuel with a Apexi afc i have in my boosted b14 but no luck, i think the fuel pump i got was the 255LHP will this be my problem?

i ran the 255lph on my pulsar with no problems, try to adjust your fuel to 44-45 psi (3 bar)thats what they run stock