Search found 34 matches

by Philip Lochner
Tue Dec 29, 2015 11:21 am
Forum: GPIO Assembly
Topic: Purpose of 4.7Ohm resistor
Replies: 6
Views: 15728

Re: Purpose of 4.7Ohm resistor

Lance wrote:So the dissipation in the resistor is P = I²R = 0.93²*4.7 = 4.06 Watts, and a 5 Watt resistor seems about right.
If you dump 4W into a 5W resistor, that baby is going to get seriously hot. :shock:
by Philip Lochner
Mon Dec 28, 2015 10:53 pm
Forum: GPIO Assembly
Topic: Purpose of 4.7Ohm resistor
Replies: 6
Views: 15728

Re: Purpose of 4.7Ohm resistor

I have since realised that the 15Ohm resistor DOES have an effect that is tangible. Shifting from N into Drive now comes with quite a harsh engagement despite commanding the lowest line pressure possible. This has prompted me to add another 15Ohm/5W resistor in parallel to the first. So now I have ...
by Philip Lochner
Sun Dec 27, 2015 10:59 pm
Forum: GPIO Assembly
Topic: Purpose of 4.7Ohm resistor
Replies: 6
Views: 15728

Re: Purpose of 4.7Ohm resistor

Thanks Lance Yes, RTFM. :oops: I need to report that this resistor holds serious danger IMHO. In my case it could have burnt the transmission harness - if I had mounted it in the harness- or possibly even the car. The GPIO in my car was getting hot, VERY hot, and I found that it was this resistor th...
by Philip Lochner
Sat Dec 26, 2015 10:16 am
Forum: GPIO Assembly
Topic: Purpose of 4.7Ohm resistor
Replies: 6
Views: 15728

Purpose of 4.7Ohm resistor

What is the purpose of the 4.7Ohm resistor in the EXTERNAL wiring diagram? : http://www.msgpio.com/manuals/mshift/wiring.html
by Philip Lochner
Sat Dec 26, 2015 4:02 am
Forum: GPIO Assembly
Topic: GPIO documentation errors?
Replies: 1
Views: 5243

GPIO documentation errors?

It seems to me that the connections between PWMx outputs and AMPSEAL pins are not documented here: http://www.msgpio.com/manuals/pwm.htm It seems the component table on that page also refers to "VBx" circuits rather than PWMx circuits. I also believe that the AMP pin no's for the VBx outpu...
by Philip Lochner
Wed Aug 05, 2015 7:55 am
Forum: MegaShift Transmission Application
Topic: Mshift confuses MPH and Km/h?
Replies: 12
Views: 9793

Re: Mshift confuses MPH and Km/h?

Right, Ive got speed sensing sorted. I've got a TP500 module doing the conversion from the sinusoidal VSSensor output to 12V square wave which is then fed to GPIO as well as the VDO speedo gauge: https://dl.dropboxusercontent.com/u/152361554/Jensen/Auto%20conversion/VSS%20to%20square%20conversion.JP...
by Philip Lochner
Tue Aug 04, 2015 9:24 am
Forum: MegaShift Transmission Application
Topic: Mshift confuses MPH and Km/h?
Replies: 12
Views: 9793

Re: Mshift confuses MPH and Km/h?

FWIW, here is a scope trace of the VSS input to GPIO with rear wheels raised, transmission in N, engine running and the wheels turning ever so slowly on their own.
by Philip Lochner
Tue Aug 04, 2015 8:18 am
Forum: MegaShift Transmission Application
Topic: Mshift confuses MPH and Km/h?
Replies: 12
Views: 9793

Re: Mshift confuses MPH and Km/h?

Thanks Lance MSQ attached. I tried reflashing the code but then CAN would no longer work and I could not figure out why. I was low on patience at that moment and then flashed the Extra Transcontrol code. That code was better in the sense that it was accurate and stable BUT NOT AT extremely slow spee...
by Philip Lochner
Tue Aug 04, 2015 3:17 am
Forum: MegaShift Transmission Application
Topic: Mshift confuses MPH and Km/h?
Replies: 12
Views: 9793

Re: Mshift confuses MPH and Km/h?

OK it certainly varies from pull-away to pull-away, and I also see it change in speed calibration when it shifts into 2nd (which is still rather hard - have not yet been able to soften it.) Its not as much that the speed is wrong, its the inconsistency that baffles me. Also, tried the beta ISR but t...
by Philip Lochner
Tue Aug 04, 2015 1:31 am
Forum: MegaShift Transmission Application
Topic: Mshift confuses MPH and Km/h?
Replies: 12
Views: 9793

Re: Mshift confuses MPH and Km/h?

It is possible that TunerStudio is mishandling the units conversion (especially if you had just changed the units settings and not re-started TS). It is also possible that the INI has become mangled (though it would be unlikely to fix itself if that was the case). However, I think a more likely cau...