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Old 10-31-2007, 05:52 PM   #1
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Default Passing OBD tests with a turbo?

I'm new here and did a little searching but couldn't find what I need.

I'm new to the Miata. Everything I have boosted before has been pre-OBD.

Example:



This Saturday I picked up a loaded '99. I'm looking to add either the FM Hydra or Begi with Xede. Maryland has mandatory OBDII testing once every two years, so I'll need to be able to pass the OBD port test.

My question is this: Which will be more emissions friendly?

I've read both install manuals. It looks like with XEDE a map can be loaded that will knock off the CEL, but for the most part it stays on (the bit in the manual about covering the light with a piece of electrical tape).

The Hydra looks to be plug-n-play enough to swap injectors, ECU, and MAF back in. Could I pin the wastegate open, reconnect the MAF and baby the car around for a few days to get through emissions? In either case a CEL is an automatic fail.

Could anyone offer some advice?

Thanks,
Pat

Sorry for the newb questions.
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Old 10-31-2007, 05:54 PM   #2
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the Xede is still a piggyback, so you'll pass odbII. The hydra replaces the ecu fully, so I'm thinking no.
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Old 10-31-2007, 05:55 PM   #3
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Basically, you have to use a piggyback ecu so the OBD system will remain working, or if you want to use a standalone ecu, put your car back to stock every time you have to get tested.
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Old 10-31-2007, 05:58 PM   #4
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Stock as in replace the ECU and injectors, or stock as in remove the turbo system?

Thanks
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Old 10-31-2007, 06:02 PM   #5
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You could possibly get away with putting the stock ecu/injectors, maf back in, but you wouldn't want to boost at all, and it takes a couple hundred miles for the obd system to fully diagnose everything, otherwise when they test it it will say something like "monitors not ready".

I would put everything back to stock, or just use a piggyback ecu.
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Old 10-31-2007, 06:03 PM   #6
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Quote:
Originally Posted by pschmidt View Post
Stock as in replace the ECU and injectors, or stock as in remove the turbo system?

Thanks
yes to all
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Old 10-31-2007, 06:12 PM   #7
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The Xede is a good way to go it seems but I don't feel it is anymore capable than a similar system such as the AEM F/IC which can be had for $360 shipped i believe. Then you would just need a PNP harness which can be had for around $100. It runs off MAP and would allow you to take off your MAF when not going in for you inspection testing.
I like the idea of the Xede and the BEGI support should be excellent. I just don't like spending mass amounts of money when not needed.
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Old 10-31-2007, 06:20 PM   #8
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You could potentially get away with a MS according to Arkmage. He is presently running parallel in his 99 and says he has no codes and has full belief that he can pass OBD 2 testing. The Innovate LC1 will send the factory ECU the right O2 code, and you can leave the maf plugged in and you can cap off the EGR. As long as the electronic components arent missing, you should be fine.

I will be going the same route as him, if it doesnt work then I guess ill have to devise a work around.
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Old 10-31-2007, 06:23 PM   #9
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Has anyone thought of making a stim that can give a stock ecu inputs that the sensor would see through the rpm range?
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Old 10-31-2007, 06:26 PM   #10
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I've heard of someone doing that before, except they attached it right to the obd connector that the emissions place plugs into and just disabled the cel i think.
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Old 10-31-2007, 06:29 PM   #11
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Quote:
Originally Posted by SamS View Post
I've heard of someone doing that before, except they attached it right to the obd connector that the emissions place plugs into and just disabled the cel i think.
Except the tests dont only look only for CEL's they look for proper emissions information as well. You can go to an autozone and they will reset your CEL for free, it wont help you pass emissions.
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Old 10-31-2007, 06:32 PM   #12
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Except the tests dont only look only for CEL's they look for proper emissions information as well. You can go to an autozone and they will reset your CEL for free, it wont help you pass emissions.
Yeah there was a stim that put out the info the emissions station wanted to see, and I think they just removed the cel bulb.
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Old 10-31-2007, 06:35 PM   #13
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Quote:
Originally Posted by SamS View Post
Yeah there was a stim that put out the info the emissions station wanted to see, and I think they just removed the cel bulb.
Well hell, I will buy one right now if you tell me where.

I was talking to my mechanic who does the emissions and I am like "what if I bring you the factory ECU running off a 9volt with an OBD plug, but it provides all the proper information for the inspection computer?" He said "if you can figure out a way to do that, no problem".
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Old 10-31-2007, 06:37 PM   #14
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I think I read about it on m.net a while back, the guy said his buddy that tuned his car built it for him, but refused to give more details because of the illegality.
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Old 10-31-2007, 06:40 PM   #15
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Quote:
Originally Posted by SamS View Post
I think I read about it on m.net a while back, the guy said his buddy that tuned his car built it for him, but refused to give more details because of the illegality.
Hmmmmm. Thats something to think about.
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Old 10-31-2007, 06:46 PM   #16
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where is lazzer, lol
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Old 10-31-2007, 07:37 PM   #17
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The Xede is far easier.
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Old 10-31-2007, 09:14 PM   #18
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its not that hard to revert to stock every other year. Plug in the maf, adjust the lc-1 output for NB functioning, wire the wastegate open...???...profit.
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Old 10-31-2007, 09:16 PM   #19
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Quote:
Originally Posted by Saml01 View Post
Except the tests dont only look only for CEL's they look for proper emissions information as well. You can go to an autozone and they will reset your CEL for free, it wont help you pass emissions.
99.999999999999999999999999999999999% of the time any emission problem throws a code and CEL. You could fart around the air filter in my TT and it would throw a CEL.
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Old 11-01-2007, 02:09 AM   #20
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I passed my OBDII emissions last year with emanage ultimate piggyback, no cat, 10psi.
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