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First build, WRX RA Engine Conversion Log


mitch8198
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ok so I have a big problem now any help would be much appreciated, it starts but doesn't run right.

It cranks over for ages before it fires then idles really rough with the engine shaking all over the place and dies when I add any throttle. almost like its a timing/spark issue. Video link below:

[video=youtube;kNzWgdzO_Us]

Ignore the squeaky starter, that's off my daily, I blew the original one.

ideas everyone?

(thanks stevie, I'm getting there)

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pretty sure leads are on correct cylinders, just in order of their location on coil pack.

injectors havent been touched, reg was showing 50, turned it down to just over 40.

havent checked earths, voltage is 12.5 dropping to 11 at startup as shown on the turbo timer, will do a proper check on ecu and battery with a multimeter soon.

thanks man, might be voltage. can the cam/crank angle sensors send incorrect signals? it is almost misfiring, like the spark is going off at the wrong time.

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thanks for all your help, found injectors plugged the wrong way after your advice yesterday

gas is a few weeks old 91 i put in to start it, 98 will go in asap if i try to drive it.

still looks like a electrical problem, ill see if anyone whos good with wiring can shine some light on it.

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  • 1 month later...

Fixed the problem, put everything back together and drove her yesterday. Surprisingly everything works, idles nice, timings perfect, temp gauge right in the middle, revs out really well.

I had the wires for crank position sensor on backwards which meant base timing was at 10deg ATDC not 10deg BTDC, no wonder it diddnt run. Swapped them over and car started first crank no worries.

RR46YAZ.jpg?1

I do have a problem with the boost, it sort of spikes to a nice 1bar at 4k rpm the car surges and then immediately drops back to like 0.5bar.

Not sure what's going on there, might be the forester ECU desperately trying to control a VF30 with the fancy open headers and exhaust. I've never driven a WRX so I dont know what it should feel like.

Thanks for the help everyone, its been a big learning experience for me, See you all at Flatnats...

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Took the external gate off, made a block off plate, just running off the internal gate. Plumbed it up to the 3 port boost solenoid off your car, running the map sensor off the silver car. Dunno how well the forester ecu is coping with a solenoid it's not used to.

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  • 2 weeks later...
 mitch8198 said:

I do have a problem with the boost, it sort of spikes to a nice 1bar at 4k rpm the car surges and then immediately drops back to like 0.5bar.

Not sure what's going on there, might be the forester ECU desperately trying to control a VF30 with the fancy open headers and exhaust. I've never driven a WRX so I dont know what it should feel like.

.

yeah, forester ecu will not help... it will be going omfg knock and then boost limp.... try get a used pnp link or similar.

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 Sancho said:
yeah, forester ecu will not help... it will be going omfg knock and then boost limp.... try get a used pnp link or similar.

the 3plug pnp links get snapped up on trade me pretty quick, ill keep an eye out.

forester ecu cant keep up with the VF30, local mechanic suggested I fit a tap in the meantime, probably will kick in quicker to control the boost spike, even if its set at factory pressure. Thoughts?

Edited by mitch8198
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just plumb the turbo line directly to the wastegate, it's not safe to be running that ecu on that engine, even at it's factory boost level for that ecu, the VF30 will be flowing more air than the TD04 the ECU expects the car to have.

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