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Converting 3 plug MPFI-T to 4 plug Spider XT Turbo .
Posted 15 February 2008 - 05:50 PM
Now my car is a 3 plug computer flap style AFM type and I need to convert to 4 so the XT's electricals can run the engine inc its infernal screwy backwards TPS .
My plan was to get a 4 plug L loom and seperate out the wiring from the CAS/transister/coil back to where the engine loom plugs are (opposite side on RHD cars to USDM) and then also the MAF wiring and resistor wiring back to the computer . Basically I'm trying to make a seperated engine control loom all the way to the 4 plug ECU then figure out how to patch power to it - possibly by 2nd fuse panel and fusable link box .
Sadly all I have to play with is a 4 plug auto non turbo L loom but it could form an ok basis .
Another thing is that engine looms will be different from Spider XT to garden variety L MPFI because the two large plugs (black and white) head towards the XT's firewall where the RHD L goes through the LHS (looking from the front) inner gard .
Can anyone spot any holes in this plan ? I realise I'm gonna have to run knock sensor wires .
Also on the computers wiring diagrams it shows a couple on pins used to differentiate between turbo/NA and auto/manual . Does anyone know if they are earthed/not earthed and for wich of two combinations ?
My brain hurts , cheers A .
Posted 23 February 2008 - 01:18 AM
The MPFi and Turbo looms are identical for 4 plug systems. there is no grounding pin to tell the ecu its turbo mode, or man/auto ect.
Just 2 ecus, turbo or mpfi
Fire me a PM on AUSubaru, im Suparoo over there.
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