924Board.org

paulc20 · Joined: 07 May 2007 Posts: 10 Location: Australia

Has anyone here used the UnwiredTools UTCIS engine management system for Bosch K Jetronic systems?

See here: http://www.unwiredtools.com/utcis.asp
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Paul

1981 924 Turbo
1986 928S

tuurbo · Posted: Wed Mar 19, 2008 6:29 am Post subject:

Very interesting - but won't your Lambda system try to compensate for anything this system does?
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1980 924 turbo, MSD, Meth. Inj, otherwise stock.

paulc20 · Joined: 07 May 2007 Posts: 10 Location: Australia

My 1981 Australian delivered car doesn't have a lambda control system, so hopefully it will work OK. I would like to ensure my mixture is rich enough under boost and this should give me control.
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Paul

1981 924 Turbo
1986 928S

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

$700, it'd better be brilliant.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Smoothie · Posted: Wed Mar 19, 2008 9:19 am Post subject:

tuurbo · Posted: Wed Mar 19, 2008 9:22 am Post subject:

Ok thanks, that answers that question. Naive question here - So assuming it works brilliantly, isn't the system limited in terms of fuel flow by the CIS and injectors?

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

tuurbo · Posted: Wed Mar 19, 2008 10:22 am Post subject:

That's true Ideola - the 924 turbo one at $700 I would like - but I'll wait for someone to try it first

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1980 924 turbo, MSD, Meth. Inj, otherwise stock.

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I'll definitely be looking into this. I'm going to download the software manual and give it a look through. I'll prob'ly send them some questions as well.

My current plan on the UWB project is to setup a rising rate fuel pressure regulator (like one of these) triggered off of a manifold pressure signal. I was planning to plumb in a completely separate fuel circuit (feed line, filter, 40psi pump, FPR, return line) so as not to interfere with or tax the stock setup. That unit is less than $300, and then add in the cost of pump, lines, etc. your still prob'ly less than $700.

However, my approach is basically mimicking the primitive approaches used on the 924 GT / GTR variants before programmable stuff was widely available. Makes it period-appropriate, but I think the UTCIS approach would be the ideal compromise if it's as programmable as the website makes it sound, and if it could control add'l injectors.

In the meantime, Tuurbo, I would think for your situation the $500 setup would be perfect, as it's designed for applications less than 1 bar / 12 psi. It might even be a worthwhile thing to consider on my 941 car, which I eventually plan to intercool and pump up to ~10 psi. Hmmmm....

Time to do some reading. I'll try to give them a ring tomorrow.
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erstwhile owner of just about every 924 variant ever made

Smoothie · Posted: Wed Mar 19, 2008 11:30 am Post subject:

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Yeah, Smoothie, you're right, I realized that after just completing reading the manual.

Doesn't appear to accommodate add'l injectors...so, in a high output application, one would have to determine the optimum fuel flow and figure out whether the injectors & dizzy could handle the flow, or if supplemental methods would be required.

The $700 unit is the one to get for any serious turbo application because it allows the map to be configured based on both manifold pressure & RPM range. I don't know much about megasquirt, but a cursory glance gives me the impression that this setup is not as granular as MS (i.e. 250 RPM increments vs. 100 RPM increments in MS, I believe). In any event, it's still gotta be better than stock CIS. Perhaps sort of a happy medium. Definitely worth further consideration.
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erstwhile owner of just about every 924 variant ever made

924RACR · Posted: Wed Mar 19, 2008 9:56 pm Post subject:

Dang, the UTCIS-V would be perfect for my racecar... too bad it's so dayum expensive... Maybe next year. Would be so easy to dial that puppy in on the dyno.

This year at very least I have to get on the dyno and adjust my basic control pressure (as per the UTCIS-G)...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Min · Posted: Thu Mar 20, 2008 1:51 am Post subject:

tuurbo · Posted: Thu Mar 20, 2008 1:59 am Post subject:

Not meaning to appear 'whipped' but my wife says No.

lol

We had a long talk about the car, expenses, all that stuff. I've been 're-educated'. Life is certainly different now that she's verbally removed my g'nads.

I love her like crazy and she's been incredibly patient with my hobby - but now I've gotta give back a bit, cool my jets and get the thing running in stock form with just a minor tweak here and there.

But I think you're right Ideola, it appears to be a good way to go! If I give it a six month wait or so and get some reliable performance out of it, she might relent.
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1980 924 turbo, MSD, Meth. Inj, otherwise stock.