I picked up a GM 3 bar MAP sensor, and mounted it to the firewall. Its fed from the fuel pressure regulator as i hear this is a more stable source of vacuum than at the throttle body. Got rid of the air flow meter too.
I knocked up an intake from a spare bit of 2.5in tubing and a silicone 90. For IAT sensing i did NOT go wth the GM IAT as they are expensive here and are an NPT thread. I chose a bosch IAT instead and am in the process of fitting that now using some 8mm 304 plate.
Look closely at the above pic (no, not at the welds) and youll see an e36 TPS i fitted, on a bracket cut from 1.5mm steel.
Because racecar, i removed the 2 idle air valves, and blanked them with 3mm steel plates.
Getting the car running again was fun. After tinkering in tunerstudio and a lot of cranking, the engine spluttered into life. I have the throttle screw set to let a ton of air through, then idle speed is controlled closed-loop by retarding spark angle as necessary. This means the car will start from cold with no throttle and maintain a steady ~800rpm idle until hot, without idle valves. It does mean the first ~5% of throttle angle is 'dead' as the ecu just keeps the car idling depsite the extra air.
Because the car is not road legal, to map the car i tried the old school 'driveway-rolling-road' trick, which involves jacking the back of the car up into the air and using the brake pedal to load the engine up. And promptly set the brakes alight.
Car runs great now though!
Watching the AFR's and listening to the knock sensor had the tune dialled in quite well. I stole and tweaked the Joe perez spark map he posted back in 2005, and have the fuelling targeted toward 12.6:1 for now. It works very well on our 95 octane regular
With the EFI sorted, that brings things up to date until before this weekend... Will update more tomorrow.