Single channel O2 - Page 8

Adger Smith · 08-09-2011, 05:28 PM

Now you know the lean/rich for 30 deg of timing! ;~)

Signman · 08-09-2011, 05:41 PM

Same thing just happened to me. The car was slowing down for no reason.

First it slowed up .05 for no reason. Ran the valves, looked over springs, drained oil and cut open filter. Nothing.

Next race slowed .10 1st round for no reason. Put it in the box to look it over at home. Plugs were rich but O2 didn't show it, then O2 would go to 15.98 just running it at idle and off idle up to 2k. Shut down ignition and restart would be fine for a while.

Next race go day early to test. First and second runs O2 wacky. Install new O2 sensor and start to get good info, pick the car up .2 but it's still .1 slow. First qualifier picks up .02, second slows .05, third another .05 I'm lost. My buddy comes over and tells me to go back to basics and check timing. Do it just to please him. It was 16* advanced. Match up what timing should be as shown on the laptop to actual.

What do I dial first round? What map do I run? How long has the O2 and timing been messed up?

Go back to test session where the car ran deadly consistent and load fastest map. Use that run vs. weather, and fastest run of the weekend vs. weather to come up with a dial. It's a .14 window. Throw a dial on the window in the middle. Kill a few and run over but flat out would have been dead on the dial. Lucky guess. The car should be a little faster but it's a little fat for what it likes.

Next time out will verify timing and tune it up, should run normal numbers.

This year has been a learning experience. Earlier in the season the car would speed up or slow down .05. Found that to be a rear suspension issue. Fixed that then the O2 and timing gremlins show up.

They say they come in 3s, so things should begin to get back to normal. Maybe!

Michael Beard · 08-09-2011, 08:20 PM

That's what I like about Adg.... always thinkin' positive! LOL

Heard a funky one at Bristol a few weeks ago. Guy running FAST XFI on alcohol said he went up to the lanes for 2nd rnd, and the car was running horrible. Dials up a second, not knowing what to do... Turns out he had the ignition on while charging the battery, and somehow it reset to a default (gas!) program. Better yet, when he went WOT, it reverted to his alky setup, and it's flying.... he pedals it, and as soon as he gets out of it, it goes back to the gas default and dies. Crazy!

So the big question is, why have we experienced a massive change in timing?!

Ed Wright · 08-09-2011, 08:30 PM

It can't switch between tune ups like that. He has something else going on.

Your timing changed because something on the engine moved. Either that or the offset number in your calibration was changed. Charging the battery with the switch left on won't hurt the ECU.

Ed Wright · 08-10-2011, 08:33 AM

Michael, if you think you have injector issues, which will effect the a/f ratio you see at the collector and can't get them flow tested locally you can always pull the headers to check for white & black exhaust ports.

Eric Merryfield · 08-10-2011, 11:36 AM

Quote:

Originally Posted by Michael Beard

That's what I like about Adg.... always thinkin' positive! LOL

Heard a funky one at Bristol a few weeks ago. Guy running FAST XFI on alcohol said he went up to the lanes for 2nd rnd, and the car was running horrible. Dials up a second, not knowing what to do... Turns out he had the ignition on while charging the battery, and somehow it reset to a default (gas!) program. Better yet, when he went WOT, it reverted to his alky setup, and it's flying.... he pedals it, and as soon as he gets out of it, it goes back to the gas default and dies. Crazy!

So the big question is, why have we experienced a massive change in timing?!

Might want to mark that distributor and intake just to make sure it doesn't move on you.....I am pretty sure it shouldn't make a difference, as I think my fast system controls the timing, but we do have distributors.....distributor gear?.....just a couple of thoughts.....make sure you keep your batteries fully charged between rounds...as it needs the juice....good luck with the DP motor.

Eric

Reed Granrt · 08-10-2011, 11:44 AM

Michael
Are you recording anything of the run into a data logger so you can replay just to look at. Sure its a dumb question, but just curious
reed

Ed Wright · 08-10-2011, 01:00 PM

Michael, aren't you using a crank trigger?

Michael Beard · 08-10-2011, 08:18 PM

Quote:

Originally Posted by Ed Wright

Michael, aren't you using a crank trigger?

No, using the FAST Dual-Sync Distributor.

08-09-2011, 05:28 PM	#71
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Single channel O2 Now you know the lean/rich for 30 deg of timing! ;~) __________________ Adger Smith (Former SS)

08-09-2011, 05:41 PM	#72
Signman Senior Member Join Date: Oct 2003 Location: Lower Slower Delaware Posts: 535 Likes: 22 Liked 269 Times in 99 Posts	Re: Single channel O2 Same thing just happened to me. The car was slowing down for no reason. First it slowed up .05 for no reason. Ran the valves, looked over springs, drained oil and cut open filter. Nothing. Next race slowed .10 1st round for no reason. Put it in the box to look it over at home. Plugs were rich but O2 didn't show it, then O2 would go to 15.98 just running it at idle and off idle up to 2k. Shut down ignition and restart would be fine for a while. Next race go day early to test. First and second runs O2 wacky. Install new O2 sensor and start to get good info, pick the car up .2 but it's still .1 slow. First qualifier picks up .02, second slows .05, third another .05 I'm lost. My buddy comes over and tells me to go back to basics and check timing. Do it just to please him. It was 16* advanced. Match up what timing should be as shown on the laptop to actual. What do I dial first round? What map do I run? How long has the O2 and timing been messed up? Go back to test session where the car ran deadly consistent and load fastest map. Use that run vs. weather, and fastest run of the weekend vs. weather to come up with a dial. It's a .14 window. Throw a dial on the window in the middle. Kill a few and run over but flat out would have been dead on the dial. Lucky guess. The car should be a little faster but it's a little fat for what it likes. Next time out will verify timing and tune it up, should run normal numbers. This year has been a learning experience. Earlier in the season the car would speed up or slow down .05. Found that to be a rear suspension issue. Fixed that then the O2 and timing gremlins show up. They say they come in 3s, so things should begin to get back to normal. Maybe! __________________ Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given"

08-09-2011, 08:20 PM	#73
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 13 Times in 9 Posts	Re: Single channel O2 That's what I like about Adg.... always thinkin' positive! LOL Heard a funky one at Bristol a few weeks ago. Guy running FAST XFI on alcohol said he went up to the lanes for 2nd rnd, and the car was running horrible. Dials up a second, not knowing what to do... Turns out he had the ignition on while charging the battery, and somehow it reset to a default (gas!) program. Better yet, when he went WOT, it reverted to his alky setup, and it's flying.... he pedals it, and as soon as he gets out of it, it goes back to the gas default and dies. Crazy! So the big question is, why have we experienced a massive change in timing?! __________________ Michael Beard - NHRA/IHRA 3216 S/SS

08-09-2011, 08:30 PM	#74
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 169 Posts	Re: Single channel O2 It can't switch between tune ups like that. He has something else going on. Your timing changed because something on the engine moved. Either that or the offset number in your calibration was changed. Charging the battery with the switch left on won't hurt the ECU. __________________ Ed Wright 4156 SS/JA

08-10-2011, 08:33 AM	#75
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 169 Posts	Re: Single channel O2 Michael, if you think you have injector issues, which will effect the a/f ratio you see at the collector and can't get them flow tested locally you can always pull the headers to check for white & black exhaust ports. __________________ Ed Wright 4156 SS/JA

08-10-2011, 11:44 AM	#77
Reed Granrt Member Join Date: Jul 2011 Location: Murfreesboro, Tn Posts: 149 Likes: 0 Liked 1 Time in 1 Post	Re: Single channel O2 Michael Are you recording anything of the run into a data logger so you can replay just to look at. Sure its a dumb question, but just curious reed

08-10-2011, 01:00 PM	#78
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 169 Posts	Re: Single channel O2 Michael, aren't you using a crank trigger? __________________ Ed Wright 4156 SS/JA