Aftermarket ECU (Motec) install in 308

I'm all set. I ordered 1/16" x 1" adhesive backed rubber from mcmaster when I ordered the wire wrap.

I've had a lot better luck with T6 than T651. In this case I just wanted a couple straight bends and Lana was home, so I used the torch. When Lana isn't home, I throw it in the oven, set it to clean and it comes out dead soft.

 

I just realized the GM IAC stepper motor I have eats 4 of the 8 aux outputs...that will never do, I had other plans for them. The motec manual doesn't provide a lot of guidance on stuff like that. A bosch unit only needs 2 output...just one more reason to build a new intake.

 

I'm probably being overly cautious, but I don’t want to take any chances. I would save some wire by mounting it in back, but it wouldn’t really be any easier to install I don't think. I would still need to run quite a few wires up front (tach, front wheel sensors, power, intercooler pump, intercooler fan, radiator fan, slip indicator light) and it’s not really much harder to pull the larger bundle once everything is apart. Plus all the fuses and relays are together this way and I like that....not that is works any better.

 

I knew the ford unit only eats 1 output, but I wasn't sure how well they work since everyone else thinks they need atleast 2 and I've never messed with one. Is that what you are running? If so, are you happy with it?

 

yeah, I knew better but I had a piece and it was the right size......it all turned out fine in the end, I just got to make it twice. I worked in a shop years ago where one of the guy would laugh and say "We make everything nice because we make everything twice".

 

Do you know what the fequecny on the M4 is? For no particular reason other than it makes all my yellow wires go the same direction I was planning to use my ign5&6 which are 5000hz. My aux 1-4 are 10000 hz

Have you use a bosch or subaru 3 wire for comparison?

I have a ford throttlebody, but it's twin from a mustang and not equiped for IAC. The twin is a nice fit to the blower inlet. I built a GM unit into the throttle to blower adapter because the haltech needed it. I could just as easy mount a ford unit I guess.

Does pep boys have them and what do I ask for?

 

All that is gone from my trunk and it gets hot in there. I don't know what it's made from.

Which IAC were you using? The only thing I wasn't able to do with the GM unit is start the car cold, it just didn't flow enough air and I hard to crack the throttle 1/2 way. After the engine was running it worked well though and it warm started fine...just the cold start problem.

 

Same as I had. I did actually port mine a bit to get it to flow more, but it was still marginal. I found that if I set the idle hot using the butterfly with the IAC closed, I had enough air to get a good cold idle. I also found that it's critical to have the timing and fuel map set be constant in the idle range. If the timing in particular changes as rpm increases slightly (the engine tends to hunt at idle. Like say the map says 10 at 1000, and 15 at 1500 the engine hunts, but adding a 10 at 1250 point solves the problem.

Maybe I'll go ahead and run 2 wires back. I can use the ford unit and if there is still a cold start or idle problem I can use the second for an idle solenoid to supplement the IAC or switch to a bosch IAC.

 

an adater can be made to put just about anything together, I can't imagine this would be any different

 

It's selectable on the M800 too, I just didn't want to use an output that wasn't capable of the required output....I've got a couple that are only 200hz, they're going to fan/pump relays.

That all works out, pump gas should be good for about 250 hp/l, exactly 400 on a 1.6l engine.

Making hp has never really been an ECU issue, so I'm not surprise. The ECU issues are generally more about transition performance, particularly off idle. The real early ECUs only had 8 rpm and load points...they ran and made hp, but streetability just wasn't there. The new ECUs do a much better job.

 

Does anybody have a source or what to ask for on the Ford IAC (most parts stores only understand make and model these days)? It looks like there are at least 2 versions, one a TB mount and one with hose barbs….I guess I could use either since I’m currently set-up for neither

How about a source for the connector? The guy I normally deal with said he doesn’t have a source for Ford connectors. I need to find a ford TPS connector too.