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fuel delivery swap question mpfi vs. spfi.
Posted 23 July 2003 - 05:54 PM
Posted 23 July 2003 - 09:18 PM
Guest_x silvershad0w x_*
Posted 24 July 2003 - 07:38 AM
SPFI is an excellent choice for an EA81 conversion thou, because it is easy, just bolt on the manifold and install the appropriate wiring harness and ecu setup, along with a fuel pump swap, true in either case.
For MPFI'ing a EA81 with EA82 MPFI system, to make it super easy, i would use the EA81T heads, since the injector bungs are in place and ready to go. I know they are hard to get ahold of, but it would make for an easier install. MPFI uses the spider-style intake afaik, and so can't adapt that easily.. I would go for trying to adapt a fit of the MPFI throttle body unit onto the EA81 carb intake manifold, or on a EA81T manifold, because those have a nice casting separation between the water channel and the intake runners.
EA81T throttle bodies use a different TPS, that is a switch, not a variable reistor, like found on SPFI and MPFI TB's. You might be able to adapt the sensor and then use the EA81T throttle body, which could make it easier on you as well.
Hope this helps some, this sounds like a great mod to an EA81. (My favorite 80's powerplant )
Posted 24 July 2003 - 08:55 AM
I agree that SPFI is the easiest choice for an EA81. The biggest problem involved in the swap is altering the LED distributor to work on an EA81. I think you'd have to do that to use the '87+ MPFI as well.
For ease of install, my natural suggestion would be to use CIS-E from a VW Fox. On an EA81 without Turbo heads, this would require drilling injector holes into the heads, but that would be true of any MPFI system. I was planning to do this to my hatchback until a EA81T engine fell into my lap. I'm still going to use CIS on it, but it's going to be a whole lot easier now with an engine built for MPFI.
Here's how CIS fit on my EA82 Wagon:
Posted 24 July 2003 - 10:03 AM
Posted 25 July 2003 - 06:50 AM
Posted 25 July 2003 - 12:28 PM
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