A few questions

nitrousdave · Post by **nitrousdave** » Sun Oct 28, 2007 8:02 pm

Well I burned my first chip today, just a copy of the stocker, but it's a start. I'm using a 7747 ECM in my 89 C2500 350/700R4 truck. First I'd like to know if its normal when logging for the coolant temp to start out high and drop? I was thinking there might be a pullup resistor or something causing this? Then is it possible to change the TPS display from volts to %? Is it possible to display injector pulsewidth? Thanks.

Six_Shooter · Post by **Six_Shooter** » Sun Oct 28, 2007 8:46 pm

Yeah, I have not been able to solve the inverted coolant display.

Yes, you can change TPS to percentage display, I'll try and upload the ADS file I have that has this conversion and a couple other small things added/changed to the fileman site within the next couple of days. It's all on my other laptop HDD that is not currently installed in the lappy right now. LOL

I added every flag and switch that I know of, or rather could find documantation on, whihc info of whihc bit, etc. I think you'll like it.

*EDIT*

I remembered that I had already copied over that folder that contains the .ADS file that I want to share with you, however, I keep being given a n error message ech time I try to upload it. I'll have to find my documentation on my webspace and upload it to there, but that may take a few days.

nitrousdave · Post by **nitrousdave** » Sun Oct 28, 2007 9:29 pm

Sent you a PM.

Six_Shooter · Post by **Six_Shooter** » Sun Oct 28, 2007 9:32 pm

nitrousdave wrote:Sent you a PM.

replied and sent.

nitrousdave · Post by **nitrousdave** » Sun Oct 28, 2007 9:53 pm

Thanks, I'll check it out in the morning.

nitrousdave · Post by **nitrousdave** » Mon Oct 29, 2007 3:07 pm

I checked it out today and was wondering about how it calculates the %. My TPS at idle is .69V (from what I've read it should be .54V?) and Tunerpro was reporting this as 13%. It is my understanding that the range on the sensor is .5-4.5, is this correct? Shouldn't it report 0% at idle? Also, at 70-75 in overdrive with the TCC engaged it was reporting 35-40%. One other thing does the ECM actually use % or just straight Volts? Some of the tables seem to imply that it does use %. Sorry for all the questions just trying to get things straight in my brain. Trying to figure out this ECm is waayy different than tuning carbs.

Six_Shooter · Post by **Six_Shooter** » Mon Oct 29, 2007 3:22 pm

The percentage is based on a caluclation of volts. I have not been able to get it to read as "0%" at closed throttle, but to me is much more useful than the voltage display in the base ADS file. I'm on the new side to this as well, so that was a learning experiance for me, to just be able to add in more values and flags.
I will be working on the $42 ADS more, but will most likely concentrate more on the Scanner Pro ADX, as I can watch more useing SP all at the same time over the ALDL dash in TP RT.

The ECM uses the voltage value. It doesn't care what the percentage is, really, just that this many volts = look at this part of the table/enable this. The percentage value is mainly for our benefit to be able to quickly see where the throttle is approximatly positioned.

nitrousdave · Post by **nitrousdave** » Mon Oct 29, 2007 3:51 pm

Do you have a link to Scanner Pro? I can't seem to find it. I wouldn't mind looking at it. Also you wouldn't happen to know if the Exreme ALDL/CABL1 can be used with WinALDL would you?

nitrousdave · Post by **nitrousdave** » Mon Oct 29, 2007 5:25 pm

NM, I just saw the area for Scanner Pro.

Six_Shooter · Post by **Six_Shooter** » Mon Oct 29, 2007 7:57 pm

Just a forewarning Scanner Pro is not for the faint of heart.

It's a very steep learning curve, especially if you're new to EFI tuning.

I'm not entirely sure if you can use the ALDL Extreme with WinALDL or not, but I do believe that it could be, as it's simply just an electrical interface between the car the laptop. Many of these cables will work with many different programs.

nitrousdave · Post by **nitrousdave** » Tue Oct 30, 2007 6:31 am

I was just out adjusting my TPS and noticed that there is an offset field (that is used in the equation) next to the factor field when editing the .ads file. Couldn't this be used to offset the reading (by what reading the TPS is at idle)? What format is this field in, i.e. hex or decimal? I tried entering -.57 but it only changed my percent at idle by 1 or 2%.

Six_Shooter · Post by **Six_Shooter** » Tue Oct 30, 2007 7:24 am

Yeah, I tried using that offset as well, and had the same result you had, I also noticed that the upper end was way off, when attempting to use the offset. I'm not sure how to impliment it fully.

I'll eventually figure it out.

nitrousdave · Post by **nitrousdave** » Tue Oct 30, 2007 6:32 pm

Like you said the offset thing only fixes part of the problem. I did try WIN/ALDL with the Extreme ALDL today and it worked. I think I may prefer it for logging, seems to log more parameters. It looks like it can't save logs though?

Turbochris · Post by **Turbochris** » Wed Oct 31, 2007 4:04 am

Hi!

If you have for example 0.7 volt closed and 4.7 volt with the butterfly open and want %, you have to convert it with some formula like:

(value-0.7) x 100 / (0.7-4.7)

So you have to insert the actual voltage at you installation for a correct result.

Chris

Six_Shooter · Post by **Six_Shooter** » Wed Oct 31, 2007 7:25 am

Turbochris wrote:Hi!

If you have for example 0.7 volt closed and 4.7 volt with the butterfly open and want %, you have to convert it with some formula like:

(value-0.7) x 100 / (0.7-4.7)

So you have to insert the actual voltage at you installation for a correct result.

Chris

I'll have to try that.

honken · Post by **honken** » Fri Nov 02, 2007 2:15 am

I have a factor of 0.392157 and no offset.
100/255 is 0.3921568.

julian537 · Post by **julian537** » Thu Feb 24, 2011 6:48 pm

I need some help with this in the 42 adx file and V5
I know the conversion is 0.392157. I have tried this, but the lowest percentage I get is 11.8 at .59 volts. not sure what is going on.

I have a range of -15.38 to 115.38. I have the conversion set at X*0.392157

Please help, I want to be able to see TPS% as well as the volts.

julian537 · Post by **julian537** » Thu Feb 24, 2011 7:50 pm

I put an offset of 10 in the formula and it worked. I set my low to 0 and high to 100 to scale the gauge.