ADC7 and Blend Curve Setup

[T3Bunny]

This is a continuation of This thread... But since I have a specific question, figured I would post it separately.

I have a V3.0 ECU with MS3 and MS3X installed. But lets mostly ignore the MS3X. In the past I have used ADC7 for knock sensing input from a KnockSenseMS. Truth be told though it has actually been hooked up for VERY little of that time. I am going to use ADC7 for a blend curve input.

The question, since ADC7 goes direct to the processor (on a MS1 setup) I am unsure if there is any protections between that input and the MS3 processor? On MS1, I have enough spare processors kicking about that popping one is unlikely to happen, but simpler than building in any more protection.

If there is nothing to protect the MS3 processor, do I need to or should I build a simple circuit? Say maybe replicate the TPS input?

I have yet to get the blend curve working the way I want from the software side of things, so likely to be a few questions there. But I need hardware wired up right first. Yes, I know it is a simple thing to wire it to one of the MS3X inputs, but they are already all being taken up. In fact right now I am finalizing their wiring and setup.

[racingmini_mtl]

It is in the manual. And yes you need to build a small circuit.

Jean

[T3Bunny]

It is in the manual. ...

Sorry, still getting used to the new manuals.... Took a while to find it. But here it is! Very simple to add in.

I have been for at least an hour now.... Somewhere buried in them, I think, is the setup information for wiring in a Blend potentiometer. I can't find that information anywhere. If it does, would somebody toss a link out here?

The "searchable contents" only help if that specific term is in there. Using control/command/F in the document itself, doesn't work. I was told blend wasn't in there, then proceeded to find it. It seems like things are more organized lately, and much harder to find.

So digging through my past threads, I found this: But Does it Blend?

Are you using an MS3X card? If so, what you want to do is easy.

The MS3X has 3 analog inputs: EXT_MAP, EGO2, and SPARE_ADC. Any one of those would work.

Get yourself a 1K, 2K, or 5K linear taper pot. You'll have to figure out which terminal on the pot is which - there are many different types. The terminal that has the lowest resistance to the wiper goes to sensor ground. The other "end" terminal connects to Vref (in other words, the +5 supply that goes to the TPS). The wiper terminal goes to the analog input on the '3X card.

That's all the hardware you need... the rest is done in software.

Google tells me that on most pots, the wiper is the center terminal. So testing this pot I see that the outer two don't change when pot is turned. Wiper to either of these changes resistance.

So after figuring out what the logical direction is for pulling timing, I leave the pot turned to max. This "should" be the normal setting and run the first set of maps.

Hopefully I am on the right track... I will edit this post again if need be.

Anyways posting that here so it is easier for me to find this, and also anyone else searching. Google mostly failed me, kept pointing back to this thread in fact...

[jsmcortina]

Why use the web-ised version ? Download the whole PDF then you can search the whole thing.

James