Turbocharged NA question
 

I turboed the S5 NA it runs and idles good for a period of time, and that period of time fluctuates, then it shuts off and wont turn on for a bit. the ECU is still NA and so is the MAP sensor. im thinking that the MAP sensor shuts the fuel to the rear rotor off because of the spike in air from the the turbo, but it also does it at an idle. am i right for thinking its the ECU and MAP or do you think my problem may be something much worse? maybe i need a wideband 02 sensor? help me please, im without my Daily driver now, and im kinda screwed

anyone

Have you driven it with the turbo on it and boosted it?

Are you still running the stock injectors?? (460cc)

Do you have an SAFC attached to your stock ECU?

yes, it drives fine untill the stall, or sometimes when i turn and it stalls.

no im running 550 TII injectors

and yes i do have an SAFC

I'd try two things.

1) compression test

2) check vacuum at idle

I did the same thing you've probably done... ported LIM for 6 port and run all NA stuff. Ended up flattening my springs. It was hard to keep it idling. I took it all back to NA and it ran fine, but the compression was low.

I also had alot of vac leaks from the LIM.

Does it start back up after stalling? Could your injectors be stuck open or closed? Maybe have them cleaned?

injectors are new, and its now a 4 port, it was rebuilt and street ported by a shop in toronto. but i think i found my problem... fuel pump resistor