xcore

So hive mind next hurdle in the turbo build ,
Hesitation when on boost, feels like boost cut but my limits a lot higher and I’m only running wastegate pressure. can rev through it with little load. No spikes in afr on the gauge or logs, also my tach is bouncing about which points to the coilpack failing? Plugs are the correct ones gapped to 0.025. Time to upgrade to cops?!



attached an old datalog i found when it first started doing it and also the current basetune i would like to identify whether this is a hardware issue or tune issue before sending it off for mapping (also need to get round to fitting my clutch)

current spec is

churbo 2871r
tested 420cc yellows
fmic
set to around 8-10psi with a helper spring to open the flapper as the wastegate seems to go up to 14psi, will be replacing with a decent one soon so i can use my MAC EBC .

thanks for any help on the issue

patsmx5

iTrader: (16)

Try running .020" or .018" gap and see if the problem improves.

xcore

done some more digging on the logs, problem seems to happen around 7psi, but weirdly the injector duty is going from around 50-60% down to 7-8%, is the ecu (DIYEFI speedunio) doing this or is the pump giving up?! what controls the injector duty cycle? iv got a set of leads on the way. Is there anything specific to look for on the logs that would indicate a physical failing componant?

ta

curly

iTrader: (25)

ECU controls injector duty, doesn't care what the fuel pressure is. If your VE and/or EGO correction is spiking at higher RPM, that's an indication you're losing fuel pressure.

In your first log, if anythings happening, it's a lean misfire. You're at naturally aspirated AFRs while in boost, giving it throttle increases MAP about as quickly as it increases AFR.

In your second log, TPS accel is active, you're basically relying on it for your fueling. Steady out your throttle foot, and tune your fuel table.