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Zdyne Open / Closed loop question

Old 08-01-2003, 04:17 PM
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Default Zdyne Open / Closed loop question

Hey guys,
Am I correct in thinking that Zdyne (and O2 equipped Honda ECU's in general) use only open loop in throttle conditions, and closed loop at idle / cruising?
If I fitted a Zdyne to a car with no O2 sensor (or a faulty one, say) I know it'll throw a code. But what I want to know is, will the car then run in limp home mode, or just open loop mode? And will it therefore see & use the boost maps without the o2 sensor?
Reason I ask is, my car has no o2 sensor, but I will be running Zdyne. I am getting one fitted but need to drive to the garage to get it done & want to know if It'll blow up on the way....
Alex
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Old 08-01-2003, 04:22 PM
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Default Re:Zdyne Open / Closed loop question

Interesting question..

From personaly experience, when my ECU throws CEL 1, the ECU seems to go into limp mode. I'm unable to really drive the car.

Whether it's reading from the maps or not, I have no idea.

The reason I'm posting to this, is because theorectially, you can force your code into open loop so that it is strictly reading from the tables.

..though, I haven't found information on the precise method of doing this. Since Zdyne is PM6 based, maybe Joseph or Mike could shed some light on maybe a bit to set, or a jmp or something that can be inserted into the code to trigger open loop.
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Old 08-02-2003, 12:34 AM
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Default Re:Zdyne Open / Closed loop question

Well, first off tell me why you are planning on running a Zdyne...ie turbo, want to be able to adjust fuel/ign, etc.

There is Euro code running around that had no provision for O2 sensor that would work perfectly with your senario(s) with no codes, etc. If you just want tunability then hit me up and maybe I can modify this codebase to work with your setup...standard code (including Zdyne) will throw a code and run in limp mode if you have no O2 sensor or a faulty one.

Mike
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Old 08-02-2003, 06:47 AM
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Default Re:Zdyne Open / Closed loop question

I'm using a Zdyne to run boost on a Supercharger. I don't want to use all the JR hacks as they look well dodgy to me.
I have a PP4 ECU in my car, it currently runs no problems with no codes as the car did not come with a Lambda sensor in the first place.
So, Zdyne will go into limp home mode? Aw crap, I think I'll just need to drive VEEEERRRRRYYYY SSSSLLLOOOOWWWLLY to my garage to get the lambda welded on so that the S/C doesn't boost. Easier with a turbo I think, not so easy here...
I'll let you know what happens...
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Old 08-03-2003, 01:31 AM
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Default Re:Zdyne Open / Closed loop question

Whoa whoa whoa.. slow down..

You're missing what Mike's offering. The code your ECU is, well, "superior" to the code we run because you don't have to deal with closed loop tuning conditions. I would query Mike and give him a copy of your ROM to see if can modify the GhD code to give you the tunability of Zdyne FREE! I would do that..

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Old 08-03-2003, 02:00 AM
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Default Re:Zdyne Open / Closed loop question

"query Mike and give him a copy of your ROM to see if can modify the GhD code to give you the tunability of Zdyne FREE! I would do that.."

I would do that too.
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Old 08-03-2003, 04:37 AM
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Default Re:Zdyne Open / Closed loop question

Yeah, but only 2 problems.
My ECU & all my spares are non-socketed and come with the 83C154 chip with no EPROM. I found a PP5 ECU but it was ruined due to water damage
Plus I've already bought the Zdyne.
BUT it may be worth my while to do GD anyway, just to give me a spared ECU & an ECU to get me to the garage I guess...
Thanks guys

Alex
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Old 08-03-2003, 10:30 AM
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Default Re:Zdyne Open / Closed loop question

Hey, I had an idea.
What if I rigged up some sort of electronic device to give an outpout voltage of 0.8-0.9V all the time, maybe even fluctuating just a little like a 'real' sensor, and used this to avoid the CEL?
I could then change the "Into Open Loop" voltage to force the car to run open loop all the time (I *think* you can do this with Zdyne, but I'm not certain) and there we go, problem solved! No CEL, no closed loop running either!
What do you think? Stoopid idea? Workable for a short while?
Alex
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Old 08-03-2003, 09:14 PM
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Default Re:Zdyne Open / Closed loop question

Sounds possible.. What you're talking about is an "O2 Simulator". There are actually a few of these on the market right now. Normally used during OBD changes for people who want a more solid solution. If you come up witha good DIY kit, let us know.
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Old 08-04-2003, 05:46 PM
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Default Re:Zdyne Open / Closed loop question

dont worry about it just hook up the zdyne and then drive to the shop but dont go into boost. hell you could drive with a stock fuel system and a turbo if you dont get into boost. all you have to do is drive like grandma.
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