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Heinno
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« on: March 03, 2011, 09:21:29 AM » |
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A few questions on this mod:
- Will this mod not cause malfunction of the ECM in the long run?
- Does it work equally well on the Interstate and the Standard?
- How much power increase could be expected and
- How much gas mileage improvement can be expected?
- What would the impact be on a bike with Cobra pipes, if the bike still has stock jets? Would it not make it run even more lean? (planning to do the re-jetting, but not sure if I am keeping the Cobra's at the moment - my bike runs like a dream with the stock pipes and I do not like to fiddle with stuff that works well)
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tank_post142
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« Reply #1 on: March 03, 2011, 10:34:01 AM » |
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all your doing is tricking the computer to believing that it is colder outside than it actually is. this causes the ecm to run in the cold weather mode. sightly higher timing advance,ect. this is up to 3000 rpm after that this input is ignored.
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I got a rock  VRCCDS0246  |
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98valk
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« Reply #2 on: March 03, 2011, 11:57:06 AM » |
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do a search. all of your questions hve been answered. I have posted the link before that shows the ignition advance curves. IMO the engine only likes the addtional advance when cold, after it gets to operating temp it is silent pinging/detnotation that can be seen with an eye piece on the plug porcelain as tiny black specs. there is a reason honda cuts out this addtional advance at 160 degrees.
the ECT advance is only about 2 degrees at 3k rpm.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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sugerbear
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« Reply #3 on: March 03, 2011, 12:00:12 PM » |
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so, does that mean the 4 deg wheel causes silent detonation also?
if so, i don't want to put one on mine.
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98valk
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« Reply #4 on: March 03, 2011, 04:48:41 PM » |
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so, does that mean the 4 deg wheel causes silent detonation also?
if so, i don't want to put one on mine.
looking at the ignition curves 4 TW is less than the ECT mod. if the ect mod is only used at hwy speeds 2500 rpms and up the additonal advance is benefical, in my experience using a dyna, the I/S ignition curve for less than 2500 rpms is very good. the I/S ICM has a few degrees more in its ect verses the std curve, the lighter slide springs allow for this. |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Heinno
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« Reply #5 on: March 03, 2011, 05:08:51 PM » |
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so, does that mean the 4 deg wheel causes silent detonation also?
if so, i don't want to put one on mine.
looking at the ignition curves 4 TW is less than the ECT mod. if the ect mod is only used at hwy speeds 2500 rpms and up the additonal advance is benefical, in my experience using a dyna, the I/S ignition curve for less than 2500 rpms is very good. the I/S ICM has a few degrees more in its ect verses the std curve, the lighter slide springs allow for this. Do you mind reposting the curve? My search function in the archives does not seem to work... thanks! |
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John U.
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« Reply #6 on: March 03, 2011, 05:11:24 PM » |
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looking at the ignition curves 4 TW is less than the ECT mod. if the ect mod is only used at hwy speeds 2500 rpms and up the additonal advance is benefical
The simple ECT mod will provide about 10º advance. I agree that this is too much, especially for an I/S ICM. This is the reason to include a potentiometer in your ECT mod. I run what I believe is about 4º. I base this guess on the increase in RPM. I also use midgrade gas. I also understood that the ECT advance tapers to 0º AT 3000 RPM. To answer a couple of Heinno's other questions, the increase in power is noticable, though that's just by the butt dyno. The increase in mpg was for me about 2 or 3 mpg, if you don't enjoy the increased power too much, 0 to -2 or -3 if you do.  |
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98valk
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« Reply #7 on: March 03, 2011, 05:41:27 PM » |
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so, does that mean the 4 deg wheel causes silent detonation also?
if so, i don't want to put one on mine.
looking at the ignition curves 4 TW is less than the ECT mod. if the ect mod is only used at hwy speeds 2500 rpms and up the additonal advance is benefical, in my experience using a dyna, the I/S ignition curve for less than 2500 rpms is very good. the I/S ICM has a few degrees more in its ect verses the std curve, the lighter slide springs allow for this. Do you mind reposting the curve? My search function in the archives does not seem to work... thanks! |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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sugerbear
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« Reply #8 on: March 03, 2011, 05:50:49 PM » |
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thanks, i had no idea the ect mod provided 10 deg. thought it was only 4 or 5.
guess i won't do the mod after all.
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John U.
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« Reply #9 on: March 03, 2011, 08:05:26 PM » |
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That's what the potentiometer is for, you can dial down the advance. Radio Shack has them.
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