CAJ Innovations Forums - TPS Idle setting

jocke

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TPS Idle setting
08/17/09 at 19:18:48

I have been playing around with the idle setting on my My16 Ducati 851/996. I dont understand the reason behind the setup of the TPS idle value on MyECU. I think that it just creates trouble.

On all Marelli ECU system that I have been working on (P7, P8, P16, 5,9) the TPS setup is the same.

Always set the TPS to 150mV +/-2mV with throttles fully closed. This is normally done by disconnecting the throttle bodies to made sure that the one with the TPS is fully closed.

Then you adjust the throttle stop the desired idle value depending on the bike. Finally set the idle with the bleed air screws. If the bike does not have bleed air screws (older bikes) the idle has to do done with the throttle screw.

This is a very accurate way to do it and it is 100% repeatable.

On the MyECU I have to tell the ECU what TPS idle I have. In my case it is TPS = 91. When I do this all the values in my map are changing and 91 is added to all values . All TPS break points are changed and my map is totaly screwed up and the bike runs like shit and I have to manualy change the values back to where I started. On top of the my max TPS will be higher then 1023 and I think that that is not very good.

Am I missing some thing here?

Why is it like this? Why do I have to enter the idle value? Does the ECU operate in a different mode when the TPS is at the idle value?

Does any thing stop me from not setting this value?

I was reading that if I select 0 as idle value the ECU will automaticly set the value that the TPS had at power up.

How do I do to not have the idle like this and just have it in "the good old Marelli way"

Jocke............

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Ducati 851/996
Ducati S4/984
Ducati MHR 900

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Luhbo

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Re: TPS Idle setting
Reply #1 - 08/17/09 at 21:26:12

I still do mine the good old Marelli way, as you call it. Closed is closed (150mv - resp. I liberately choose to define closed as 10 on the Optimiser) and idle in my case is 60. The only thing I had to do next was to subtract 60 from the entire map and to check that the upper value stays in range (I think 980 resp. 920 in my case).

And I made sure that WOT is WOT, so the upper most value in the map is 20 or so below that what the TPS shows as WOT.

Basically that's the most important thing you might be missing: first check the range of your TPS as shown on the Optimiser or ECUControl. Then adjust your map according to that.

Hubert

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greenmonster Full Member Offline Sweden Posts: 196	Re: TPS Idle setting Reply #2 - 08/18/09 at 01:32:52 Quote: Basically that's the most important thing you might be missing: first check the range of your TPS as shown on the Optimiser or ECUControl. Then adjust your map according to that. Good tip, will check asap.
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raz

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Guzzi 11OO Sport, My16MkV,
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Re: TPS Idle setting
Reply #3 - 08/18/09 at 08:47:30

I think once you get used to it it's no problem. I set base and idle TPS by the book, then adjust idle speed by changing mixture (in map, not using bleeders), never by messing with the idle screw. This means after I found my baseline (TPS base 33, dead idle 77, running idle 96 and WOT 993) it will never change.

Personally I want my WOT to be spot-on the breakpoint.

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« Last Edit: 08/18/09 at 08:48:20 by raz »

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1100 Sport iniezione elettronica -- the perfect merge of a superbike and a steam train

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greenmonster Full Member Offline Sweden Posts: 196	Re: TPS Idle setting Reply #4 - 08/18/09 at 10:16:43 Quote: and WOT 993) it will never change. Personally I want my WOT to be spot-on the breakpoint. 993 is WOT minus idle (33) on the road w the Optimiser, right?
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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: TPS Idle setting Reply #5 - 08/18/09 at 11:38:11 You could set your TPS Base to a low value, ie 1. This will then give you the old way
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raz

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Guzzi 11OO Sport, My16MkV,
Innovate LC-1

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Re: TPS Idle setting
Reply #6 - 08/18/09 at 15:18:54

greenmonster wrote on 08/18/09 at 10:16:43:

Quote:

and WOT 993) it will never change.

Personally I want my WOT to be spot-on the breakpoint.

993 is WOT minus idle (33) on the road w the Optimiser, right?

Almost - my running idle is 96. My highest breakpoint is 896. Sums up to 992 and my WOT is 993 (unintended discrepancy but good enough of course).

Moving away from 150 mV will move the point where the TPS curve gets less steep by the way. Maybe it's not that important. I've always wanted to have my bike ready for "oem plug'n'play" just in case, that's why I like to use the WHB figures. Another reason is that it's the only intuitive way we could share maps with eachother.

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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: TPS Idle setting Reply #7 - 08/18/09 at 19:03:04 When asked, I've always said the bike should be setup for the OEM and no mechanical adjustments for MyECU apart from idle speed.
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greenmonster Full Member Offline Sweden Posts: 196	Re: TPS Idle setting Reply #8 - 04/09/11 at 00:17:31 Quote: You could set your TPS Base to a low value, ie 1. This will then give you the old way So is there really any practical reason for having to set the Idle TPS?
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YaBB Administrator YaBB Administrator Offline I love YaBB! Posts: 679 The Land of YaBB	Re: TPS Idle setting Reply #9 - 04/09/11 at 06:47:06 There are a couple of reasons. For one I think the OEM has about 2 rows below the idle value and thus wasted. Also it makes for easier adjustment as after each tune the base will usually move a little. The later ECUs moved to the idle TPS didn't they.
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greenmonster Full Member Offline Sweden Posts: 196	Re: TPS Idle setting Reply #10 - 04/10/11 at 19:45:32 P7 & P8 had two lower than idle breaks, my 907 even 3. 1,5, & 1,6 only have one. Later ECU`s have idle TPS but that idle has a separate lookup table, totally independent of fuel & ign maps breaks. Think I`ll go w 1 in Idle TPS fr now on.
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