 74-2.0 timing/tuning Questions? |
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| Strudelwagon |
 Apr 20 2012, 05:17 PM
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#1
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Member  Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada  |
I've got a stock GA code 2.0 motor running the factory FI with Petronix module installed.
Question #1- when you pull the vacuum hose off the dizzy to set the timing, do you have to plug it or does it matter.? I assume @3500RPM the ECU wouldn't notice the vacuum leak. would the MPS notice? Question #2- Idle adjustment......Once the timing is set and mine is, the idle is at 800-820 RPM. do you trim it with the air screw on the Throttle body or the trim knob on the ECU? Thanks Guys SW |
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| TheCabinetmaker |
Apr 20 2012, 05:42 PM
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#2
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Yes. Plug them. Use the screw on the throttle body to set idle speed. The ecu knob is for idle mixture.
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| TheCabinetmaker |
Apr 20 2012, 05:44 PM
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#3
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Did you check the dwell before setting timing?
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| Dave_Darling |
Apr 20 2012, 05:51 PM
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#4
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Q1: Just pull it. You can plug the line if you want to be extra careful and make sure no dust could get sucked into the intake, but that's kinda overkill on careful. The injection won't care about vacuum leaks at the manifold, it will just think the throttle is open a tiny bit more. And you're not shooting for a precise throttle position, just "enough to get to 3500 RPM" (or more).
Q2: The one on the throttle body. I remember the spec speed being 800-900 RPM, but frankly "just under 1000" is close enough. --DD |
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| Strudelwagon |
Apr 20 2012, 06:13 PM
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#5
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Member Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada |
QUOTE(vsg914 @ Apr 20 2012, 04:44 PM)  Did you check the dwell before setting timing? How does one check the dwell angle on a Pertronix? Steve |
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| falconfp2001 |
Apr 20 2012, 09:51 PM
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#6
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
QUOTE(Strudelwagon @ Apr 20 2012, 05:13 PM) QUOTE(vsg914 @ Apr 20 2012, 04:44 PM) Did you check the dwell before setting timing? How does one check the dwell angle on a Pertronix? Steve You don't. I think he is talking points. |
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| Strudelwagon |
Apr 20 2012, 09:56 PM
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#7
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Member Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada |
QUOTE(falconfp2001 @ Apr 20 2012, 08:51 PM) QUOTE(Strudelwagon @ Apr 20 2012, 05:13 PM) QUOTE(vsg914 @ Apr 20 2012, 04:44 PM) Did you check the dwell before setting timing? How does one check the dwell angle on a Pertronix? Steve You don't. I think he is talking points. That's what I thought. Thanks for the confirmation guys. There is no substitute for experience and I can always count on lots of it here! (IMG:style_emoticons/default/beerchug.gif) SW |
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| TheCabinetmaker |
Apr 21 2012, 07:52 AM
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#8
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Ooops. Obviously I failed to read the complete post.
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