Question for Engine Tuning Guru's re: ECU/PCIII TPS - MVAgusta.net
 
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post #1 of 6 (permalink) Old 05-04-2011, 02:28 PM Thread Starter
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Question for Engine Tuning Guru's re: ECU/PCIII TPS

Didn't get any responses with this buried in another thread so I was hoping someone who has experience with this might chime in.

Update:

Did some more research, spoke with a few peeps and received my VDST. Here are some talking points:

Given my setup with race ecu and PCIII, resetting the TPS could/would screw up the PCIII fuel maps as they read off the TPS and the bike was tuned (right or wrong) to the current TPS setting.

I played with the air bleed screws some more and got the idle down to 1500rpm, any less than that didn't sound smooth. Next I plugged in the VDST and the TPS angle reads 5.6 degrees at idle. Now the info that came with the VDST says that the 5SM ECU should be 4.6-4.9 degrees. If you read the MV shop manual, it states 2.1-2.5 degrees. But neither of them take into account the PCIII.

So, the bike now idles at 1500rpm and I assume still pulls great and has nice on and off throttle response (as it did my last ride and all I have done is change the air bleeds). I am thinking even though the TPS is slightly high at 5.6 degrees but the bike performs so well I should leave things as is and enjoy it. I am thinking if I reset the TPS it could really screw things up and cost me more time and money having it retuned on the dyno.

Lastly, one of the tuners I spoke with who suggested closing the air bleeds a bit to bring the idle down said that would be moving toward a richer condition at idle which could also help keep it a bit cooler.

So thoughts from you guys on any of this? Thanks! Weather is looking up for this Sunday and I can't wait to take it for another rip.
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post #2 of 6 (permalink) Old 05-04-2011, 06:18 PM
lee
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PC could care less about the TPS or ECU. It just modifies what's coming out of the ECU via it's mapping.

If it's running and performing well and you're satisfied then LEAVE IT THE F ALONE and enjoy it. Numbers are just that. Numbers. It's how it runs that matters. Screw the numbers.
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post #3 of 6 (permalink) Old 05-05-2011, 11:50 AM
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if the PCIII is mapped with 5.6 TPS you should only re-adjust the PCIII when it changes.
If you reset the TPS with VDST it will just tell the ECU that that voltage will correspond to 2.3 TPS.
If you change that the PCIII needs to be told that as well.

I think the ECU gives a rich mixture as result of the 5.6 TPS valuue and they might have corrected that with the PCIII. So it might be when you set TPS to 2.3 and correct the PCIII to that as well you might get a lean mixture or need to map the PCIII again.


So do not fix what is working.

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post #4 of 6 (permalink) Old 05-05-2011, 12:16 PM Thread Starter
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Quote:
Originally Posted by hb88xx View Post
if the PCIII is mapped with 5.6 TPS you should only re-adjust the PCIII when it changes.
If you reset the TPS with VDST it will just tell the ECU that that voltage will correspond to 2.3 TPS.
If you change that the PCIII needs to be told that as well.

I think the ECU gives a rich mixture as result of the 5.6 TPS valuue and they might have corrected that with the PCIII. So it might be when you set TPS to 2.3 and correct the PCIII to that as well you might get a lean mixture or need to map the PCIII again.


So do not fix what is working.
Thanks for the info! Sounds like if I reset TPS there will be some PCIII fiddling needed. Unfortunately, I have never played with a PC and don't know how to access it. Is that something I could do on my own or would I have to take it to a shop with a dyno?
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post #5 of 6 (permalink) Old 05-05-2011, 12:16 PM Thread Starter
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Quote:
Originally Posted by lee View Post
PC could care less about the TPS or ECU. It just modifies what's coming out of the ECU via it's mapping.

If it's running and performing well and you're satisfied then LEAVE IT THE F ALONE and enjoy it. Numbers are just that. Numbers. It's how it runs that matters. Screw the numbers.
HA! I am leaning that way...
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post #6 of 6 (permalink) Old 04-17-2012, 04:16 PM Thread Starter
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Update. Just in case anyone else is playing with their air bleed screws. Turns out that closing my bleed screws some to bring the idle down ended up give the bike stiff/jerky off-on throttle response. Prolly due to more vacuum on the throttle plates or some such as has been mentioned around here. Anywho, I just opened them back up a bit, the idle is back up to 1800-2000rpm but the off-on throttle response is like butter now. Soooo much nicer for getting back on the throttle early in a corner. So any of you with a snatchy off-on throttle might want to check those air bleed screws.

Jeffy
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