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Running in Close Loop?

Old 05-23-2005, 04:37 PM
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Default Running in Close Loop?

Is it alright to run in close loop weith a PM6 and TE? When I'm in close loop I have near perfect AFR's and after cruising for a while I through a o2 sensor code. I'm working on smoothing this out, but until then I'm just wondering
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Old 05-23-2005, 04:52 PM
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Default Re: Running in Close Loop?

You mean open loop and yes it should be fine.
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Old 05-23-2005, 06:52 PM
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Default Re: Running in Close Loop?

Yeah, as Dave stated it sounds like your reffering to running open loop until you fix your O2 code situation. Sure you can run in open loop but you might/probably will notice your vacuum maps being pretty rich or even some lean spots in some areas. Nothing to be overly concerned with unless you want to run open loop constantly.
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Old 05-23-2005, 07:14 PM
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Default Re: Running in Close Loop?

ya, sorry I did mean Open loop, so cool. I was thinking of deleting the o2 address in my code and trying to tune it to run like that, but how would that effect my gas milage. This is my daily driver and seeing about 1hr highway time everyday. I figure I might even get better milage if I tune it right. I just want to make sure. By the time I got my wideband last season I only had time for WOT tuning, but now I'm trying to get part throttle too.

Another problem is when I let of the throttle to full shut, the car pops and fires like crazy through the exhaust. Now I know a little bit is normal when you have free flowing exhaust but this is a HELL of a lot. My thought is that tmy timing is too retarded in High Vacuum. That way the combustion is still happening while the valves are opening?
Any thoughts?
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Old 05-23-2005, 07:34 PM
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Default Re: Running in Close Loop?

Well, with a good tuned map with closed loop disabled, you can still have good gas mileage and not have to worry about being in closed loop when your part throttle boosting. Thats the good part about being able to disable it. But, it definately will require alot of time and work to get the vacuum portions of the map tuned out. Datalogging is going to end up being your best friend in that situation but spend some time working out your vacuum maps and you'll be good to go.
As for the timing issue's it's a tricky one to say "that's definately the problem" over the net without being able to physically diagnos it. It could be something as simple as bad plug wires or plugs. Sure your theory could also be correct but to pinpoint it exactly would require a further look. I know mine will backfire occasionally after downshifting etc. but not all the time. It's kind of funny actually to have it scare people.
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Old 05-23-2005, 07:49 PM
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Default Re: Running in Close Loop?

Oh ya, it is fun to cruize around, let off the thottle and too have it pop. The average person thinks you just have a shitty car, but to the trained person they know you have something going on under the hood. It's kinda like having a big lumpy cam on a got ol' 350SBC or so. But mine is pretty rediculus. I might try a few things like plugs, I was going to get some 2 steps colder any ways, I might just have to take the time and play around with it. The only stange this is that my map from last season (NG4 didn't do this but this season's basemap (NG55 I decide to start from scatch and play it safe instead of trying to convert the two codes) does it really bad. Oh well, more fun for me to play around with.

As for datalogging, any really tried and trued USB Cables out there yet?
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Old 05-23-2005, 08:06 PM
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Default Re: Running in Close Loop?

I've been using a Max233 board and serial cable with no problems on Uberdata. I've also used the USB models from Radio Shack with success (had my laptop wanted to co-operate).
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Old 05-23-2005, 08:24 PM
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Default Re: Running in Close Loop?

Ya, I have MAX233 boards That I have built, I have not tried them with this code of TE yet, but now my new laptop does not have any Serial Ports. I do have a Convertor Cable, but I would just like to have 1 straight forward device because my chip burner uses serial and I don't want to constantly be swapping cables. I'm gonna either buy a Stealthmode USB, Wait for Xenocron To get his USB cables or check and see if I can order a Radio Shack one. I know there is a spot I can get these cables but there an cheap no name and I'm not too sure if it will work for my application.

Thanks for the help and info though.
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Old 05-23-2005, 08:35 PM
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Default Re: Running in Close Loop?

No problem. I know what you mean about having to use the cable converters. Thats why my USb cable would have worked had my computer wanted to recognize the USB card I needed to use since all I had were serial ports. But the serial ports weork fine. Good luck man-
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