Tweaking EZ-F?
#1
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I was reading through the Service Bulletin for '85 EZF/LH and saw something that caught my eye.
The Temp II on 32V cars has two separate sensors; one for LH, and one for EZF. According to the bulletin, the EZF side: "...advances ignition timing in partial load range with a cold engine for better pickup".
I've noticed that my '86 is a bit dull on pickup when warm (even with 3° cam advance), but noticeably perkier in this area when cold. As far as I've seen on other cars, this period of advance is retarded by various methods so as to reduce NOx emissions.
If I disconnect the EZF wire to Temp II, and wire it through a 2K ohm resistor (< 85°F) to ground, I could retain this advance?
(*Update* - works, see page 4)
The Temp II on 32V cars has two separate sensors; one for LH, and one for EZF. According to the bulletin, the EZF side: "...advances ignition timing in partial load range with a cold engine for better pickup".
I've noticed that my '86 is a bit dull on pickup when warm (even with 3° cam advance), but noticeably perkier in this area when cold. As far as I've seen on other cars, this period of advance is retarded by various methods so as to reduce NOx emissions.
If I disconnect the EZF wire to Temp II, and wire it through a 2K ohm resistor (< 85°F) to ground, I could retain this advance?
(*Update* - works, see page 4)
Last edited by PorKen; 12-06-2006 at 01:41 AM.
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Porken,
I can't see how it would hurt anything.
Here's one: How about wiring it through a Potentiometer or a switch that you could adjust or flip from the driver's seat?
I can't see how it would hurt anything.
Here's one: How about wiring it through a Potentiometer or a switch that you could adjust or flip from the driver's seat?
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I'm sure glad Porken bought himself one of the '85-'86 MY's. I fully expect him to have me driving a 400 rwhp monster before too long, through the careful use of bubble gum, bailing wire and maybe a little duct tape (Canadian models only).
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#5
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From the limited information in the bulletin, I think that it's a programmable threshold. Although, (I think unlikely) it could be variable.
The specs are the same as for the LH side, in ohms:
32°, 4.4 - 6.8 K
60° - 85°, 1.4 - 3.6 K
105°, 1.0 - 1.3 K
175°, 250 - 290
212°, 100 - 210
Maybe I'll use 5 or 10K to be sure.
The specs are the same as for the LH side, in ohms:
32°, 4.4 - 6.8 K
60° - 85°, 1.4 - 3.6 K
105°, 1.0 - 1.3 K
175°, 250 - 290
212°, 100 - 210
Maybe I'll use 5 or 10K to be sure.
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I'm thinking the only drawbacks would be the reason it's variable in the first place, as Porken says:
'this period of advance is retarded by various methods so as to reduce NOx emissions'
'this period of advance is retarded by various methods so as to reduce NOx emissions'
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#8
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Possible pinging (pinking for Canadians
).
Part of the cold effect is the air temp/density. Also, the EZF checks the air temp sensor (Temp I, in the bottom of the air filter box) and retards by 3° if the intake air temp is over 122°F.
Notes:
Unplugging or shorting the Temp I is seen as a fault = -3°
The 'octane loop' plug appears to work by grounding the Temp I input = -3°
The LH doesn't use Temp I, it relies on the MAF
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Part of the cold effect is the air temp/density. Also, the EZF checks the air temp sensor (Temp I, in the bottom of the air filter box) and retards by 3° if the intake air temp is over 122°F.
Notes:
Unplugging or shorting the Temp I is seen as a fault = -3°
The 'octane loop' plug appears to work by grounding the Temp I input = -3°
The LH doesn't use Temp I, it relies on the MAF
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Originally Posted by NJSharkFan
Here's one: How about wiring it through a Potentiometer or a switch that you could adjust or flip from the driver's seat?
Rich
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Originally Posted by John Speake
You'll be able to fully remap it to whatever you want when the LH2.2 ST is done.....
No really, I can't wait...must have more, now.
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#13
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There are sometimes setbacks in development. '86.5 below was supposed to be development mule for LH2.2 SharkTuner. Luckily there are other local cars for Niklas to use.
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928 will live on, new owner is already fixing it.
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928 will live on, new owner is already fixing it.
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Moose?