No this section can be read by anyone who registers here. Non members can also post replies to any thread, they just can’t start one. So that does make it pretty public.
When you set the TPS it determines the baseline for the throttle opening positions. This is important because it is a factor in the fuel map the other being rpm’s. So the TPS set at 4.6 for a CARC model will indicated to the ecu the throttle is closed. You open the throttle the TPS reading changes, the ecu knows where you are for any rpm and injects the right amount of fuel. Simples.
Good idea if you’ve got the gear to keep an eye on it because it allows you get the best out of the engine.
I can imagine Guzzi - Piaggio - are keen not to have a repeat of the incorrectly set TPS/poor chip/poor fuelling issues which marred the Centauro experience for a lot of owners in their early days of ownership. The bashing that model got in the press must have left it’s mark ! Sounds like voiding the warranty 'cos you’ve been altering the settings could be directly linked to this.
Just to throw other variables in - the “base TPS” can vary depending on butterfly bearing wear and voltage variation - although the latter should be accommodated by the ecu voltage regulation part of the circuit. A good reason to check out & maintain good earth returns.The base voltage can increase by as much as 75mV between no throttle - engine stopped, and no throttle - idle - engine running on my Sporti (butterflies pulled by passing airstream). In this case I use the running reading. 75 over +/- 5000 (mV units) is small beer IMHO and its the base we are setting up anyway so the map should be unaffected apart from losing a small area of the matrix range.This is a reason to forget warranty issues after a number of years. Anyway - what warranty - I keep reading on here that Piaggio are cr@p at sorting out customers problems.
As said above, this does not really apply to the B1100, as you never measure any actual voltage at the TPS.
Of course butterfly bearing wear might well affect things later in life.
Once any bike is over 2 years old, the warranty situation doesn’t apply anyway.
Dammit that means my V1000 is OUT of warranty …
I am not sure what you mean by this Brian - the cores from the tps must have voltages present - unless there is no power on to the bike ecu. It is after all just a glorified potentiometer and any change in butterfly angle gives a change in voltage which the ecu uses to determine the fuel to add. By tapping into these wires you can read on a voltmeter what the mVs are at any throttle “setting”. Unless it’s a fancy new Guzzi system which communicates by telekinesis or sumfink.Or Hall effect jobbie?Digging deeper:- http://www.thisoldtractor.com/guzzi007/schematics/2005_Breva_1100.gif
Mad Farquhar2012-05-01 21:48:37
Hmmmmmmmmmmm. I’m sorry I asked this question now. Some of the discussion has gone straight over my head.
Does anyone know if the latest Guzziology covers this area on the Breva 1100?
aha thanks brian I had not realised that non members could read this, so I presume if some one googled it the page would show up
well I have read all this techie stuff so at the next club meet at least I will sound like I know what I am talking about !!
or not
I must admit I looked under the petrol tank at bristol on saturday mine seems to have more wires than some older bikes
and soem have bigger sticky out things
I even saw one that only had one clattery thing at the front
but I did chat to lots of nice members all of whom seemed very friendly to an idiot like me
right I am off to polish my trunnions and linish my gribblets
Yes there will be a voltage there, but there is no way of knowing what it should be. The TPS is reset electronically by the software to 4.6/4.7 which I would assume is the closed angle of the butterfly.
OK - I’ll need to have a closer look at the more modern Guzzi efi stuff now to see what “improvements” have been made since my simples 1100 Sporti version.
Oh, lots of “improvements” have been made, all of which add considerably to the average maintenance bill.