UTCIS-V porsche911 SC -EURO-

[icarus]

Replacing warmup regulator with UTCIS-V in 911 SC -EURO- 1982



Also a new presure regulator (4,5 to 5,5 bar)



update next week

[don gilbert]

Please keep us posted on this. I considered this product, but jeez, 500 bucks. Im sure you will like this. Ive been experimenting on my own electronic control pressure regs. (using used medical flow regulators) Only thing is mine is manually adjusted from a knob on the dash, but it works great for adjusting for temps and barometric changes,

[marlinspike]

When did you last hear from UnwiredTools?

I had a UTCIS-PT in my car. I sent it to unwired tools to be upgraded to the new unit and because it had broken (would set the control pressure to 1.5 bar no matter what). On 2/19 they told me the unit had arrived the day before. They told me it would ship back to me 2/22. On 3/6 I e-mailed them to see if it had shipped. On 3/8 I got a response from Steve that he would look into it and get back to me later that day. I have e-mailed them twice since then (3/11 and 3/15). No response. I left a voicemail yesterday, still no response.

[ahdoman]

I'm getting the same response. I ordered a CIS control gauge on the 3rd of March. I've yet to get it or a response to any of my VM's. I was seriously considering ordering the UTCIS-V but after this lack of customer service I need to find something else!

[marlinspike]

I heard from them yesterday. Apparently they had some parts availability issues that just got cleared. While I really think they need to work on communication (I know I would have been more comfortable hearing "hey, it's going to take a few weeks" than I was with silence), but having a communication issue is better than being dishonest. That and the UTCIS-PT really has been amazing in my car. Whoever said you can't use lumpy cams with Bosch CIS injection has never used a UTCIS-PT.

[icarus]

Hi there

Did some progress on installing the utcis-V.
The engine runs much better then before when using the original wur. (Made also adjustable)
Good fine-tuning sollutons, but still a rooky on tuning engine managmnt. maps.

Have yet some small problems during the warm-up cycle.
The engine starts cold perfect but gives some backfires after 5-6 minutes now and then.
It stops bckf when the engine is warm after 10 minutes idle running.

When reading the utcis engine management system the temp is 31 Celsius.

The dashboard temp gauge read about 80 degrees Celsius after 10 minutes.


(We don't have (strong) emission laws so O2 sesors are not fitted at all on any euro 911SC 1982, so don't look at O2 its not connected)

Not sure what causes these different temp readings.
Any suggestions?

I have also contacted Frank from Unwired for assistance.

Greetings frome Europa,

Eduard

Amsterdam Netherlands.

[prebordao]

Originally Posted by don gilbert

(using used medical flow regulators)

I gave some thought about doing my own integrated regulator complete with electronic control, but I hadn't managed to find suitable flow regulators so far. Never remember to check for medical parts. Can you PM me some suitable links ? Thanks

[Vin-barrett]

Originally Posted by marlinspike

Whoever said you can't use lumpy cams with Bosch CIS injection has never used a UTCIS-PT.

I'd like to know more if possible- What cams are you using?
It's my understanding that the urban legend of lumpy cams not working is that the airflow (at idle?) can get so choppy that the air metering plate jumps up and down too much, however I have yet to hear any actual experiences from someone trying it.

Thanks
Vinny

[marlinspike]

Originally Posted by icarus

Have yet some small problems during the warm-up cycle.
The engine starts cold perfect but gives some backfires after 5-6 minutes now and then.
It stops bckf when the engine is warm after 10 minutes idle running.

That control pressure looks kind of high. This is just a stab in the dark, but it's so easy to do you might as well try it - try lowering the warm up/idle control pressure a few tenths of a bar and compensating by adjusting the metering plate screw.

[marlinspike]

Originally Posted by Vin-barrett

I'd like to know more if possible- What cams are you using?
It's my understanding that the urban legend of lumpy cams not working is that the airflow (at idle?) can get so choppy that the air metering plate jumps up and down too much, however I have yet to hear any actual experiences from someone trying it.

Thanks
Vinny

My cams are custom grinds - the car is a Mercedes, not a Porsche, so it wouldn't be that helpful to know more about them, plus I don't know the specs to be honest other than I know they have as much lift as you can get away with without having longer valve stems made and more duration than the AMG cams that existed back in the day.

When I had a standard WUR in there, I did have mixture issues because of the cams. The idle would be constantly go lean/rich/lean/rich at idle, so to keep it running reliable I just had to make the idle rich. That and because the cams were tricking the car (manifold pressure at idle was ~0.6bar), a control pressure that worked under throttle meant too rich at idle. It ran, but it got very poor fuel mileage.

[911st]

CIS is sluggish for several reasons.

Poor AFR's under many conditions, slow metering plate responsiveness, poor air fuel mixing at low rpm, and less than ideal ignition timing function. And yes, a cat converter that makes the exhaust restrictive.

Total power has been further caped when Porsche timed the cams for low rpm power to try to overcome some of this sluggishness.

Fix and work around these and you should be able to transform an SC.

First, a programmable WUR can achieve near ideal AFR's at all load and rpm conditions in a way much more accurately than a stock WUR can even hope to.

Secondly, with acceleration by quickly lowering Control Pressure more than needed at first, one can motivate the metering plate so it is significantly more responsive.

Thus, with a programmable WUR system we can achieve targets like the mid 14's/1 AFR's at idle and cruse for better economy, near instant 13/1 with acceleration for maximum power production, and by using a 'drop and catch strategy' to get the sluggish metering plate moving faster better throttle response.

I have done this on a 91 CIS turbo I owned and it worked very well. I could blip the throttle and it responded more like an EFI motor.

Then there is the ignition side.

At a minimum one might consider setting there timing curve and advance to a more ideal setting on a dyno.

Many do not realize that CIS has a weakness where at low rpm fuel is not atomized very well. Fuel is being sprayed 100% of the time with CIS and the fuel just sits in the intake port waiting for the valve to open. This makes for a poor air-fuel mix that is both lean and rich at different places in the combustion chamber and can be difficult to ignite (thus the funny pistons and smaller intake ports on the 80-83 SC's).

This is not such an issue at higher rpm when the fuel deliver pressure increases to the injectors and the air velocity through the ports improves. Especially on the small port 80-83's.

I belive one of the best ways to improve the ignition side would be to go to a 'programmable' MSD system.

With this 'programability' we can build a more ideal timing curve that makes more power.

With the MSD's hotter 'multiple' spark up to about 2500rpm it helps to ignite our poor low rpm air fuel mix.

It is like programmable MSD was almost designed just for our CIS.


Then if one wants more total power potential we might want to re-time the cams to 76-77 euro specs. If we look at the early 3.0 it made peak HP at 6000rpm v 5500 for the SC. If we can move the point where the cams work efficiently up 500rpm it has the potential to improve peak HP up to as much as 9%, all by its self.

The key to getting this all to work the best is doing a good dyno tune so we can identify our ideal setting given our specific build and fuel availability.

However, the AFR's can be started on the street with a good wide band O2. One might consider looking at a 2.2 or 2.4 911E's advance curve as a starting point for timing. Still, the key will be optimizing one's AFR's and ignition on the dyno.

If going the way we would probably want to move our rpm cut out higher. If so, bumping the oil pressure like icarus is planning would be a solid idea.

Viva La CIS!

[icarus]

Hello

The Utcis-V works very good now! But still have some minors in the warm up map.
It has to do with the temp sensor. Unwired working on it.

I drive on the autohbahnn several times between Munchen - Amsterdam.
Top speed at 145mls with 10 minutes intervals engine runs like never before, perfect response!

Next track: Stelvio pass Italy, the best track in the world.
Lets see how Utcis-V handles these more then 48 hairpin turns up and down.. at 2500 mtr above sea level.


Eduard
The Stelvio Pass Italy typical 911 track!

[icarus]

After many request how to connect the vacuum line on a 911 euro, this is a quick draw how I did it.

Hope it helps



Regards

Eduard
Amsterdam, Netherlands

[gegge]

icarus:

Did UnwiredTools solve your issues with the temp? I´ve got a problem with the temp not moving at all (and a false PRM signal adding 1000RPM as well)

I´ve been chasing Steve for months and was promised a replacement, but all of a sudden he is gone...

[prebordao]

any news on UTCIS ?