ECMlink DSMlink and adjusting timing based on IAT

[gixxer6]

I am running DSMlink V3 on my 1G with speed density. If I tune for no knock at 70F by reducing timing, then when it warms to 80F it starts to knock. I'm in Michigan, and will drive in temperatures that vary from 40F to 100F. So it's either I tune at 100F and give up performance when it cooler, or I tune when its cooler and knock when it warms up. Anyone else run into this?

I posted on the ecmtuning.com forum suggesting that they add the ability to dsmlink to be able to adjust timing based on IAT temperature. That is, you would tune at 80 degrees (IAT reading) as you normally would, then set another table that could increase or decrease based on IAT temps. As and example the table could look like this:

Temp Timing
<30F +5
30-40F +4
40-50F +3
60-70F +2
70-80F 0
80-90F -1
90-100F -3
100-110F -5
>110F -8

This could potentially greatly improve your performance in cooler temps AND reduce the chance of knock!

The powers at ECMtuning said that it currently isn't an option and they do not plan to add this functionality. Because there hasn't been enough interest in this feature. It makes sense that they don't want to add a feature that no one would use. That is the purpose of this post. If you'd like to see this feature added, please go to the forum and let them know! http://www.ecmtuning.com/forums/showthread.php?p=656615#post656615

 

[gofer]

The climate I live in we get down in the 40s in the winter and 115 in the summer, everyone has this problem. You can either run a summer (conservative) tune year round, use the aux maps feature and wire up a switch to go between both timing tables, or save both tunes on your laptop and load them as the seasons change.

I can see the functionality of what you're proposing but where are you sampling the temp. from? IATs, ambient, etc.

 

[gixxer6]

The climate I live in we get down in the 40s in the winter and 115 in the summer, everyone has this problem. You can either run a summer (conservative) tune year round, use the aux maps feature and wire up a switch to go between both timing tables, or save both tunes on your laptop and load them as the seasons change.

I can see the functionality of what you're proposing but where are you sampling the temp. from? IATs, ambient, etc.

The most accurate place to sample the temp from would be a post turbo IAT sensor. Although it would probably work reasonably well with the stock IAT too. If they were to add the table function, it wouldn't just solve the seasonal temp problem, it would also solve the knock issue caused by IC heat soak while sitting at a stoplight, or those long 2nd-3rd-4th gear pulls.

I am working on a circuit that will monitor my GM IAT sensor and will switch to the secondary maps at an adjustable set-point. This is one step above using a toggle switch as you suggested, but would be no where near as powerful as using a table.

If you want to know more about the circuit, click the link above!

 

[gixxer6]

I got the circuit installed. It works great! It runs the more aggressive tune under 90F, then switches to a tamer tune when the temps increase. It does this "on the fly", and is instantaneous. On an 80 degree day I did a 3rd gear pull and the intake temps rose above 90 and it switched tunes, with no knock.