Hi guys just looking for some inspiration....

Engine Spec...
Subaru Impreza In tank fuel pump
ST170 Engine dry sumped
Jenvey individual throttle bodies with 90mm trumpets
DTA ECU
Sard Fuel regulator

O.k. now the challenge... The car will start but idles like a pig then stalls
When you touch the throttle it stalls
If you give it a bit of throttle then the cars starts sound o.k. but then dies.
I have 3.0 Bar fuel pressure but don't seem to get any more that this...

any ideas?

thanks
Dave Bailey

What is the fuel pressure supposed to be?

has it ever run properly with that setup?

has it been mapped?

Not sure about 3 bar I think...
No never been run
No not yet I am using the STD st170 map in the DTA software with closed loop. I have an innovate wide lambda fitted.

Dave B

Sounds like it's running too weak? whip the plugs out to check . Check the coolant temperature sensor and wiring? check for air leaks , add more fuel if you can

if you open the throttle and it stalls, then that normally means that there isn't enough fuel being added. Has the TPS been properly calibrated?

Rough idle could be lots of things. Do all the headers heat equally? or is it running on the same 1 or 2 cylinders.

I agree with the above suggestions, add some more fuel and see if that helps (if the temp sensor is too high then the ECU might be adding insufficient fuel, but in this weather this isn't as big an effect as in winter).

Are the throttle bodies balanced (not sure how this works with Jenveys). Once its running it would be good to check.

I think my problem is associated with not being able to maintain pressure at the rail.... I have a Subaru fuel pump that is supposed to be good for 300 HP but I can't get above 3 bar at the rail.. Just opened the top of the tank up and I can see that either the hose off the top of the pump is leaking or the pump has a pressure safety valve which I suspect it has.... I need to work out how the system should work... I have 6mm fuel lines and I'm concerned that the pump pressure needs to be higher than the safety valve on the pump to maintain 3 bar at the fuel rail.... At least it starts I suppose!

Dave B

What a feeling.... I had two issues... a bad plug then I found out that the sequencial injection run off the cam sensor had the wrong angles... So turned off the sequential injection and she runs like a dream... I'll get a video up as soon as I can.

Dave B