ECT Mod Improvements?

[DarkSideR]

I'm going to do the ECT Mod, but doing some homework before hand.

Since the original write up in Shoptalk, has any improvements been made? Is there a better resistor, or can a pot be now purchased where all travel of the pot has an affect rather than only 1/2 turn?

Thanks in advance,

DarkSider

[big poppa pump]

If you want only half of the advance, don't even bother putting a pot. Get a 2.2k Ohm 1/2 Watt Resistor instead of a 3.9k Ohm resistor. This should give you approximately 5-6 degrees of advance.

[pancho]

"The pot was selected and customized (adding the 3.9kohm Resistor) to give you approximately half of that advance when the pot is turned half way up.  The very beginning and the very end of the adjustment will not do anything.  That was to insure you could turn the advance completely on and completely off."

I think it is just the wording of the statement that is a bit confusing.. The full range of the pot actually does have effect.... Fully counter clockwise, you have a short, (if wired as the picture shows) which adds nothing to the original circuit resistance, so the ECT thermistor controls the action as designed.  no additional timing advance.

fully clockwise, you have added the series resistance of the added circuit into the ECT thermistor resistance which makes the ECM think the bike is cold no matter what the coolant temperature,,, extra 10 degrees advance.

The evidence is that when the pot is fully colocwise, (full on) and the bike is warm and dropped into gear, the RPM will jump up 200 or so.

Half way adjustment on the pot, half added advance.   When the bike is warm, the thermistor has very low resistance, and what is tricking the ECM is the added series resistance from the mod. Not sure if that makes it clear or not Josh.

[Momz]

I use a single 3.8 Ohm resister and an I/S ECM. You WILL feel an improvement.

[DarkSideR]

"The pot was selected and customized (adding the 3.9kohm Resistor) to give you approximately half of that advance when the pot is turned half way up.  The very beginning and the very end of the adjustment will not do anything.  That was to insure you could turn the advance completely on and completely off."

I think it is just the wording of the statement that is a bit confusing.. The full range of the pot actually does have effect.... Fully counter clockwise, you have a short, (if wired as the picture shows) which adds nothing to the original circuit resistance, so the ECT thermistor controls the action as designed.  no additional timing advance.

fully clockwise, you have added the series resistance of the added circuit into the ECT thermistor resistance which makes the ECM think the bike is cold no matter what the coolant temperature,,, extra 10 degrees advance.

The evidence is that when the pot is fully colocwise, (full on) and the bike is warm and dropped into gear, the RPM will jump up 200 or so.

Half way adjustment on the pot, half added advance.   When the bike is warm, the thermistor has very low resistance, and what is tricking the ECM is the added series resistance from the mod. Not sure if that makes it clear or not Josh.

Thank you Pancho that explained it very well. I will do the simple ECT mod with the pot as described in ShopTalk.

Oh I did check with BonS and he said he has no plans on doing a plug and play unit at this time. Sad face.

[pancho]

You bet,,  try to get an "audio taper" pot when shopping,, they are linear ,, like a volume control,, all pots are not.

[Wayn-O]

Oh I did check with BonS and he said he has no plans on doing a plug and play unit at this time. Sad face.

I am currently working on the ECT mod doing it plug and play style.  I used an old wire harness from ebay to get the connectors to make male>female couplers with. 



I just didn't feel too stoked on slicing up my existing wiring.  I started a thread a few weeks ago where I presented the idea.

http://www.valkyrieforum.com/bbs/index.php/topic,86129.0.html

Instead of using the pot I'm just gonna use a on/off switch to enable or disable the advance.  I'm just waiting for my SPDT switch to arrive from China and I'll finish the install.

[98valk]

the engine does not like all of that additional advance below 2k rpm.
unless one is using premium the engine might tolerate it.
suggest plugs be checked with an eye piece to look for black specs of detonation/pinging or worst case bits of aluminum on the insulator.
there is a reason the Honda engineers turned off the AA once at operating temp, and even when cold it gets turned off when accelerating more than 3500rpms.
http://www.powercommander.com/downloads/Support-Released/Dynatek/Manuals/D3K1-1RevD.pdf

[IamGCW]

You bet,,  try to get an "audio taper" pot when shopping,, they are linear ,, like a volume control,, all pots are not.

No, they are not but they sound that way.

 Audio taper potentiometers show a logarithmic graph line though, due to the physics of hearing, logarithmic tapers sound linear when used as volume controls.

https://www.circuitspecialists.com/audio-taper-potentiometers

[Relax]

At what temperature do the advanced timing get switch off on the bike originally.
In my area, i can often ride with the coolant temp lower that 100-120 F....

At what temperature do you feel the difference before and after the modification?

[98valk]

At what temperature do the advanced timing get switch off on the bike originally.
In my area, i can often ride with the coolant temp lower that 100-120 F....

At what temperature do you feel the difference before and after the modification?

160F~,  see link I provided, dyno provides info and the advance curve.

FYI, anything below 180F increases engine wear. I use various size radiator blocks to keep temp up.