Reviews on the UTCIS V warm up regulator

[91166 Carrera]

I'm on my second rebuilt warm up regulator and about to get it rebuilt again. I'm now looking at the UTCIS V digital unit as a replacement. My 911 is a '76 Euro Carrera 3.0 targa. I can't seem to find any recent reviews of this unit. If anybody has run this unit please chime in.

Harry
'76 Euro Carrera 3.0 targa
'24 Mecan EV4

[tiemeyj]

I've been running one on my 2.7 for a few months and have been happy. It's nicely built and easy to install BUT it takes a lot of effort to dial it in. There were a lot of bugs in the software that I had to work around, but Unwired was responsive and worked with me. Now that I have it dialed in, it's been rock solid and it's nice to have the adjustability.

If you enjoy tinkering and understand CIS, I think it's worth the headache and time if you REALLY want to quickly adjust pressures. Just don't expect it to be plug and play. It's really hard to beat the simplicity and reliability of a well calibrated factory WUR. I bought mine to see if I could 'tune' out some light bucking at parking lot speeds by keeping the mixture a little richer at light loads. I was willing to gamble with this purchase, but I had to fight to make it work.

I found there was about a .4 bar difference in what the software displays for control pressure and the actual pressure measured by a CIS gauge. So, if I want my warm control pressure to be 3.0 at idle, I have to set the software to 3.4 bar to achieve my target. Not a big deal, but annoying for sure. I then discovered the warm control pressure to engine load (vacuum) scale was off by .2 bar and wouldn't let me set an effective pressure for anything close to WOT. Unwired Tools was responsive and acknowledged the problem. I sent my unit back to them and they put the UTCIS-PT firmware on it so I could adjust control pressure beyond 0" of vacuum (the -PT version is for boosted applications). Kind of a hack but it worked out.

You absolutely need a set of CIS gauges and I highly recommend a wideband sensor to confirm AFRs. A Mityvac is helpful to simulate engine vacuum so you can confirm your map with the engine off.

[fanaudical]

0.4 bar is ~5.8 psi. That's quite a bit of offset...

[PeteKz]

Harry, they may have revised their unit, and timeyj seems to indicate they have, but see this thread, and ask them hard questions before you buy:
https://forums.pelicanparts.com/porsche-911-technical-forum/1147010-digital-wur-utcis-v.html

[91166 Carrera]

Thanks everyone for the information. I'm sort of in the unfortunate position of either having to rebuild my WUR or go modern and spring for the UTCIS system. Its expensive either way. Thanks PeteKz for the link and I hope that's a one-off situation. I'm going to purchase it and hope for the best. A shop in Salt Lake City has installed a few of them lately and they appear to be plug and play, and have not have any problems. I will test the UT system for system pressure, control pressure and residual pressure using the fuel gauges and readjust the CO after installation, if for anything just to see how close their digital measurements are to the analog measurements. Thanks again for the input.

Thanks,
Harry
'76 Euro Carrera 3.0 targa
'25 Mecan EV4

[jac1976]

Check out other options from RarlyL8 and Classic Retrofit

[PeteKz]

Harry, please post your experience with the UTCIS WUR here. I thought about it a couple years ago, but the reports I linked kept me from doing it.

[91166 Carrera]

PeteKz-will do. Thanks, Harry