How To: Add Pressure Input for PC-V

[Ishrub]

Googling the pressure range "10-127 Kpa 405-4750 mv" does confirm that range is used in many vehicles probably as a std component range for combustion engine mgt units.
Many Mercedes models, and VW Bora at first glance:

10-127 Kpa 405-4750 mv - Google Search

 

[Claviger]

Great detective work guys!!

Just remember offset voltages inside the ECU will lasted the sensor voltages if you’re trying to make the TuneECU and PC-V tables align. On my bike, from memory it was like -0.34mv difference.

 

[barbagris]

Just need to do some research find the car model it fits and look it up..

I think as @Ishrub says it is a Mitsubishi electronics ref. not the automotive division. Ironic eh!.

 

[barbagris]

Great detective work guys!! Just remember offset voltages inside the ECU will lasted the sensor voltages if you’re trying to make the TuneECU and PC-V tables align. On my bike, from memory it was like -0.34mv difference.

My playing was in the 3 decimal place so yup. BUT before we get to obsessed - we need to take into account mfring tolerances. This is Blueprinting territory.

 

[barbagris]

Now who can spot the R3 TPS matchup?

Having never had a close look at the original - tough. Which is it?.

 

[Ishrub]

Having never had a close look at the original - tough. Which is it?.

No idea, was waiting for you to find them cheap and 'aftermarket' or that could turn out to be 'beforemarket' if a generic component too, either way I ain't fussy.

Aren't there thousands of threads about R3 TPS with pics and many comments about there being black and blue ones or is that just the badly 'bruised'?

 

[Claviger]

I made a quick attempt at the TPS thing. Couldn't find anything out there that was the same, many similar, but none the same.

 

[barbagris]

Googling the pressure range "10-127 Kpa 405-4750 mv" does confirm that range is used in many vehicles probably as a std component range for combustion engine mgt units.
Many Mercedes models, and VW Bora at first glance:

10-127 Kpa 405-4750 mv - Google Search

mapped them out - The low volt value seems VERY VERY close - The high volt value is way off.

 

[barbagris]

Simply remove the EVAP canister crap, use the now unused vacuum ports on each runner and tap them to the manifold block, then run one line from the manifold block to your 3 bar and Bob's your uncle.


After initial trials I found the vacuum buffer not required, but will certainly help smooth the signal and thereby fueling. The vacuum signal does fluctuate a lot at cruising speeds causing afrs to swing up and down by about 0.25-0.5. I will be adding the buffer to my setup and using a second stock MAP sensor dedicated to the PC-V.

Rob - As we EU folk have no EVAP stuff - it dawned on me it could be an interesting option. it fluctuates a lot more than .25-.5 up here.

Use any old 1bar sensor for the PCV - but get one that is calibrated and documented. Any old USB supply will give us 5V. Using a GM or VW sensor means easy access - Now where are these unused ports? - Are they threaded or push on? - If threaded what thread?.

 

[sleeves]

Now who can spot the R3 TPS matchup?

Hi Ishrub

I tried to find/source an alternative TPS a while back without success in fact I found a chinese website that did nothing but TPS units, there were around 30 pages of them, no luck. The TPS is a Keihin unit and is also fitted to some single injector body single cylinder KTM i think? Only crossover I could find. Think this may be made specifically for Keihin and theres probably not enough of (demand for) them for the knockoff shops to begin production.

Now whether a different one can be adapted up to work, that's another question.

By the way, all youse making jokes about Joe Lucas and British wiring, my bikes got a Keihin EFI and ECU, now I find its got a Mitsubishi MAP, pretty sure the Prince of Darkness hasn't been too close to these....