Aftermarket ECU to run TBI on a Sierra

[Moph]

Am looking at fitting TBI to my Sierra G13BA due to a stuffed carby (wax choke is dead). Have scored inlet manifold, throttle body and sensors from an 8V Sidekick (US Vitara) but don't have a computer for it.

Wondering what my options are. Am thinking maybe a MicroSquirt (miniturised MegaSquirt) would be the go at US$400? Any advice on these or other low end ECUs to control fuel only?

[DamTriton]

Megasquirt???

Build it yourself or buy prebuilt

[Loanrangie]

Jaycar do one as well although i dont know anyone who has buil or used one.

[Moph]

Yeah have been looking at the Jaycar one.

It gives you the power to completely tune the air/fuel ratio throughout the entire load range, at 128 load points

I take it this means it has 3D mapping (ie any combination of revs and load), not just a 2D linear path with revs and load increasing. I don't see any mention of cold start adjustments / warm up enrichment or any of the other neat features of a MegaSquirt / MicroSquirt though. Kinda doesn't make sense to get rid of a carby cos the choke's stuffed, only to replace it with injection that likewise can't cope with cold starts

Not keen on spending the big bucks on a MicroSquirt, but also not keen on gimping my TBI setup.

[chimpboy]

Would an ECU from a TBI swift do the job?

Or just go to US ebay.

http://cgi.ebay.com/ebaymotors/91-94-Ge ... 240%3A1318

It sounds like that seller might be able to send you the loom as well so it would be more or less plug and play.

http://motors.desc.shop.ebay.com/items/ ... 028&_rdc=1

Just an idea, I am not zuk-oriented.

[Moph]

Hmmm, good thought chimp. I take it that to run an auto ECU on a manual car I would just need to find out how the 'Park' start postition is enabled and bridge it?

Would have thought the TBI Swift ECU might be mapped for a revvier engine than the Zook???

[chimpboy]

Hmmm, good thought chimp. I take it that to run an auto ECU on a manual car I would just need to find out how the 'Park' start postition is enabled and bridge it?

On my rover v8 ECU, there's a resistor of specific ohmage across two wires if the vehicle is a manual, which I assume affects a few minor things like idle speed and overrun. However it works fine with a manual gearbox and without that resistor.

Obviously this is likely to be completely different on the zuk ECU but (a) it may be a bit more than just bridging two wires and (b) it probably wouldn't matter much.

... no idea on the Swift mapping. My only thought was that TBI is pretty basic tech and the differences would be more in spark timing than fuelling, so... shouldn't matter? But this is just my uninformed speculation.

[David_S]

I would have a good look at the Megasquirt. Relatively inexpensive if you build it yourself and lots of info on the internet with really helpful forums.

Go to

http://www.megamanual.com/index.html

http://www.msefi.com/index.php

[chimpboy]

I would have a good look at the Megasquirt. Relatively inexpensive if you build it yourself and lots of info on the internet with really helpful forums.

Go to

http://www.megamanual.com/index.html

http://www.msefi.com/index.php

Me too unless there's a cheap plug-it-straight-in-and-forget-about-it option.