Non-Linear TPS Reset Long Version - check

[rule62]

First of all... Thank you Mr. Black

http://www.bikeboy.org/ducati2vthrottleb.html

I went to the Toyota Dealership on Wednesday to have them take a look at a rattle I had in my driver's side door.  Loose window regulator.  They tightened it up and while they were at it, decided to give me a new battery for free.  Power Toyota in Tempe, FTW.  Stopped by the parts counter to sign the warranty paperwork and spotted a multimeter for sale $9.99.

Now with multimeter in hand, I was ready to tackle the TPS reset long version!
(The short version was just setting it to 434 mV at idle without setting the base level or messing with the throttle stops at all.)

This time I did not set the TPS with the bike hot.  All work was done with the bike cold, just flipping the key to on, the bike not started.

Observations:

The short version TPS set I did at idle with the bike on and hot (220 degrees) was set at 434 mV.  The initial TPS reading I took with the bike cold and not started was 448 mV.  

I backed out the RH throttle stop pretty far.  I did not remove it, although it is indicated that you can just get rid of it in Brad's directions.  It is still there but is serving no purpose at this time.  The LH throttle stop is the only one you need.

I loosened the balance adjuster 2 full turns, as indicated, before messing with the LH throttle stop.  I returned the balance adjuster to its original position after setting the TPS.  I will most likely benefit from another TB synch in the near future. (Perhaps when I install the PCIII I just scored for cheap $$$.  Thanks D!)

After backing out the LH throttle stop and closing the butterflies, the base TPS reading I got was 290 mV.  It's supposed to be 150 mV.  I thought that was pretty far off, and when you take the mV relation to the butterfly opening, may be part of the reason that my bike would not idle with the air-bleeds closed the last time we synced the TB's.  

I set the TPS base setting at 150 mV as indicated.  Then I began adjusting the LH throttle stop to get 434 mV exactly as indicated.  After that I returned the balance adjuster to where it was previously by tightening it 2 full turns.  Put the air-box back in and fired her up.

The bike was idling pretty high.  Both of the air-bleeds were backed out pretty far from the last time we messed with them after synching the throttle bodies.  I closed them both and let the bike come up to temperature.  At 200 degrees, I backed each air-bleed out only 1/4 turn to get an idle speed of about 1150.

Oh yeah... I also put my original voltage regulator back on.  Really no reason.  Just to keep the part #s matching as much as possible. 

Tomorrow will be the shakedown run.

[Dietrich]

Nice work Dr.Rule62.  Interested to see how it pans out.

Dude - Just noticed this is in the AZ section, you should have posted this in Tech! Good stuff.

[dinenoj]

Excellent understanding of the FI set up and adjust (as if I would know how its done).
Now, I'm looking for some understanding of a four carburetor adjust and sync.... almost ready.
See you at the shakedown run.

[rule62]

Bike isn't idling great.  Took a preliminary TPS voltage reading and it was a tiny bit off.  Gonna re-do this procedure, minus messing with the balance screw. Hope it bodes well with the nice, new PCIII map I just got.  Throwin some new spark plugs in there too.  Then an oil change.  Either tomorrow, or when I get home from Denver next week.

[rule62]

Done!  Well... except for the oil change.  Here's what I found.  

A little history.  Just after I got my new PCIII map, I went to see a friend's band, The Muddy Violets, play at Teakwood's up on 32nd and Indian School.  When I got out to my bike at the end of the night, I got a little scared.  It wouldn't start.  Needles swept, but then nothing... except for the check engine light!  CRAP.  I cycled the key a few more times, and it finnally started.  Thank goodness.  On the ride home, I noticed that my mirors had a bunch of spots on them.  I must have parked near a sprinkler.  Maybe a bunch of water was the cause of the wierd starting problem.  Ever since then though, I feel like the bike isn't idling too well.  So that's what prompted TPS set part deux - "Electric Boogaloo".

The entire proceure was done with the bike cold, ignition on, bike not started.

Preliminary TPS voltage = 420 mV (should be 434)
TPS voltage with throttle stop all the way out = 177 mV (should be 150)

I reset the TPS, with the throttle stop all the way out, to 150 mV and then used the throttle stop screw to find 434 mV.  
Buttonned everything up and turned the bike on.  So far so good.  
Next time my TPS drifts, I'm gonna spring for a new one.  At least I'm a pro at setting them up now.   
Brought the bike up to temperature and backed out the air bleeds to an idle speed of about 1250.  About half a turn each.  I purposely set my idle a little high because of the lightened flywheel.

If it weren't so make the beast with two backsing hot out right now, I'd be on a shake-down run on South Mountain.

[DucDucDave]

Did you remember to use one of the new cover sheets?

[rule62]

So far so good.  No popping on decel and got the front wheel up in the air.  Can't wait for some cooler air one of these days.