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REPU Creamsicle Build

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Old 08-08-18, 08:48 PM
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What a nice REPU! great job on the build, the engine bay looks really nice, love those ITB's.
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Old 08-08-18, 11:11 PM
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Thanks, still could use a little tidying up, but I'm happy with how it turned out. Trying to drive it as much as possible now since it was off the road for over a year. I'll make a video walk through soon.
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Old 08-11-18, 08:12 AM
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Amazing. I love it.
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Old 08-12-18, 08:32 PM
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Very nice truck you've got there. The intake and ignition are really nice, but I think my favorite part has to be the re-wire. That is truly impressive and you deserve your props for that. I never thought of wiring as being particularly hard, but it certainly can get tedious and frustrating, so I know there had to be days/nights when you were close to slitting your wrists. Now it's time to enjoy.
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Old 08-13-18, 03:24 PM
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I did my research ahead of time and bench tested several of the more complex circuits to ensure I wasn't guessing when it came time to hook up the wipers and lights for the first time. The only frustration I had was realizing I had to add a wire here and there. I haven't pulled the harness to bundle everything with electrical tape yet, and I'm glad I installed it first.

Example 1: ground wires. I grounded the ECU to the firewall at first. This is apparently not wise as the radio was also grounded to the firewall (but in a different spot) and introduced alternator whine into the speakers. Afterward, I ran a new wire through the bulkhead connector so it could be grounded to the engine block. I get overall higher voltage readings in the logs and I think it helps with consistent fuel metering from the injectors.

Example 2: at first I tried no idle control valve but the truck needs a few minutes to warm up. If you want to just get in and go it's necessary no matter what people tell you. I ran two wires at first, for a Ford style valve but couldn't get it to work. There wasn't enough vacuum to close it when needed. So I ran another wire and now use a Bosch style valve. It works well but I still need to tip in the throttle to start the truck. Not sure if it's air or fuel related. An expert could probably tweak my ECU settings and resolve it.

Example 3: I've added a few more circuits like the clutch input and I control the shift buzzer with the ECU instead of it going off at 6,000 RPM or whenever it damn well pleases.

I suppose I could have planned ahead for all of these but this was my first rodeo. I'm about to start an EFI conversion on my Rx7 and it should go pretty smooth now that I know more about each of the inputs and outputs on the ECU.

I now understand why wiring harnesses cost so much. The connectors aren't cheap, and there is a lot of labor involved. It can be just as rewarding as getting your hands greasy and you'll look at people's engine bays a lot differently after you make your own harness.
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Old 08-14-18, 12:16 PM
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It sounds like you enjoy a bit more than I do. No, but seriously, I hear you. I'm in the middle of wiring up my second aftermarket EMS and you mentioned two keys points that I learned. The first is not to try to "pretty up" the harnesses before you actual get the car running. I learned that the hard way and I'm behaving accordingly with this one. The second is realizing just why custom harness cost so much. Quality parts and the amount of time and labor needed to do it RIGHT is insane.
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Old 08-14-18, 10:23 PM
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My first introduction to modding was with car audio so the wiring comes naturally. I had some pretty junk cars in high school that had great audio systems. I had bigger plans for this truck but the cab is so small it doesn't really need or have room for a serious system. I got the headrest speakers and thumpers in the Miata seats working and that's it for audio for now.
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