OBD2-->OBD1 ?
 

Ok, I hate to ask it, cause it kinda feels like one of those noOb type questions, but I have been searching the site and can't seem to find any info. I think my ketword skills suck!! My buddy is putting together a HMT style kit for his 99EX at the same time I am working on mine for my 91 hatch. He is highly concerned about management and I am trying to convince him to convert to OBD1 and use Uberdata. I am not sure what is involved in the conversion and what would be involved in going back and forth between OBD1 & 2 because we have emissions check here in Ohio. I thought I read something about being able to make little sub-harness type adapters that could let him switch back and forth, but I can't seem to find any of that stuff now. Anybody that has any links/eperience with this, the info would be greatly appreciated.

Re:OBD2-->OBD1 ?
 

Yeah all you need is a conversion harness that goes for about $115 or so. It just plugs into your OBD2 ecu's plugs and has plugs at the other end to insert into an OBD-1 ecu. I'll see if I can find some to show you. Also if your friends EX has a 3 wire IACV I beleive he's going to need to convert to a 2 wire.

Re:OBD2-->OBD1 ?
 

You didn't search hard enough noob. :P

https://www.homemadeturbo.com/forum/...threadid=32538
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Re:OBD2-->OBD1 ?
 

http://cgi.ebay.com/ebaymotors/ws/eB...sPageName=WDVW

Even less than I thought they sell for. Anyway going OBD-1 and running Uberdata would be his best bet. And for getting your emmissions sticker, unless you know someone who can "hook you up" ;), you'll probably end up having to remove the turbokit and swap back to the OBD2 ecu to pass. They check to see if theres any codes in the ecu.
I ran into this problem last year. They went to check the codes in my 2000 Integra thinking it was still OBD2... I told them it was converted to OBD1 and he had to put his 98 Camaro on the code reader just so they could enter the info in the computer that there were no codes thrown ;) nice to have some help out there getting stickers.

Re:OBD2-->OBD1 ?
 

Ok, so other than the IACV (if it is different), he will not have to change injectors or anthing like that? Pretty sure he is gonna stay around 6-7 lbs, so stock injectore would probably be fine. I did not think there was that much to worry about. So come e-check time, we can switch ecu's back and maybe lock the wastegate open so he builds no boost and they can check it. Not sure how they do e-checks anywhere else, but OBD2 ---- just gets plugged into the diagnostic port and they do a gas cap pressure check. Thanks Trance and anybody else that replies.

Re:OBD2-->OBD1 ?
 

OBD2 and OBD1 uses the same impedence injectors, but stock injectors will not be sufficient for boost.
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Re:OBD2-->OBD1 ?
 

I figured if he was staying down around 6-7 lbs, he would be ok. It's not like it is a big deal to swap injectors at echeck time, so if he has to run some 450's or something, it should not be a big deal.

Re:OBD2-->OBD1 ?
 

You know what is really fucked up, I think I read that god damn post, cause I remember the part where Kevin said he would not try to open the IAB on an ECU he was doing for someone else. Eh, I'm old, I don't always catch everything, lol.

Re:OBD2-->OBD1 ?
 

Yes I suppose you technically could get away with that ZC4ME. Around here in MA. they also do a visual check and I guarantee you if they saw a turbo sitting under the hood of my Honda... I'd get a big fat F

Also, Boost is right about the injectors. They will be the same as long as their OBD1-OBD2 injectors, but they will not flow enough to support 6-8 lbs. of boost. I'd just look into some 450's. They run great using Uberdata and you'll be all set if you ever want to turn up that turbo pressure. I know you will :D

Re:OBD2-->OBD1 ?
 

Yea, they only really check to see if the car has a cat on it. They hold a mirror up under the car. So as long as jst swapping those things back and making sure the turbo will creat no boost, the car should run fine and visually it should pass. As far as the IACV, I should be able to get some plugs and make an adapter harness that we could unplug so the original IACV would plug back on, right?

Re:OBD2-->OBD1 ?
 

Yup. Sounds like things are getting planned out pretty well.

Re:OBD2-->OBD1 ?
 

Thanks fellas, I am discussing it with him now, and yea, I think we have a plan!! Now I am gonna have to learn to tune using TE on my car and Uber on his. Gonna be a fun summer ;D

Re:OBD2-->OBD1 ?
 

since he has an ex, his iacv should already be 2 wire i believe, if it's a manual tranny, then i know it's 2 wire, so all you'll need to do is plug the harness up and plug an ecu in, plug and play. there are 2 different styles for obd2, since he has a 99, he'll need an 'obd2b to obd1' conversion harness, they're 78 bucks shipped on www.jdmshit.com. yes, you could boost about 6 psi with stock injectors, but that's up to you/him, but no way would/should you go over 6 psi. the iab thing, that's only with gsr's and h22's, so you don't have to worry about any of that. all you'll need to do is plug the harness and ecu in and go.

Re:OBD2-->OBD1 ?
 

Yea, I was talking to him online earlier and had him go out and check his IACV, he told me it was 2 wire, so I told him he was golden with that. I am pretty sure he was already planning on getting his harness from JDMshit and we both already agreed just to get the DSM 450's so he would have the cushion for upping the boost later. So, he is going to be running the hf mani with a garret m24 turbo with .80 a/r (not sure what it is from) he has a starion intercooler, going to be running the dsm 450's with a 'projekteg chipped' P06 ecu running Uber and I think he might be running a 2nd gen dsm bov. Should be sweet for a first time set-up.

Re:OBD2-->OBD1 ?
 

Yeah I remember I accidentally got the wrong harness the first time because I didn't know any better. I was so pissed when it came in and one of the plugs didn't match up ???

Re:OBD2-->OBD1 ?
 

If his car is a stick its a 2 wire IAC. If its an auto its 3 wire and a boat anchor.

Re:OBD2-->OBD1 ?
 

www.jdmshit.com has them cheaper and someone posted the other day and they were $55.

look for a obd0-obd1 post it had a link in it for really cheap conversion harnesses.

Re:OBD2-->OBD1 ?
 

^^ Damn for 55 shipped I would have snatched one up.
I have a 97 LS, so it is OBD2a. I was going with jkobdconversionharnesses.com sale price now is 85 bucks, and he matches ANY online price.

I was leaning toward JKOBD because i heard his are truly "plug and play".And that some others there are still some wires to add, etc.

So which is it. If the jdmshit OBD2a-OBD1 harness is truly plug and play, then I will pick one up today if I can find the post for $55 bucks. ? ? ?

Re:OBD2-->OBD1 ?
 

depends if you have a 2 or 3 wire iacv i think they are all made for 2wire and if you have 3wire you have to alter harness.

Re:OBD2-->OBD1 ?
 

I see i think mine is 2 wire, but I am not sure.

No more harness for 55 though :( ?

Re:OBD2-->OBD1 ?
 

Go here. http://www.evasivemotorsports.com/me...ode=OBDHARNESS

OBDIIa or b has nothing to do with whether its a 2 wire or 3 wire IAC.

If you have a civc 96-00 that IS NOT VTEC you have a 3 wire IAC on the Throttle Body. If you have a 96-00 Civic VTEC auto It is a 3 wire IAC on the TB. If you have a Standard Civic VTEC (EX) Then you have the correct 2 wire IAC on the manifold.

B18B's are 2 wire IAC.

Re:OBD2-->OBD1 ?
 

yep thats the website i was talking about, its not 55 like i remembered but its only 4 dollars more 59.

Re:OBD2-->OBD1 ?
 

Dayum, that is a good price. Anybody have any experience using that harness or know anybody that has used it, is it a quality piece?

Re:OBD2-->OBD1 ?
 

dunno looks better than the one i made. but if you buy it just pull every wire where its soldered individually to make sure they are soldered good. thats what i did with my since half of it i didnt have flux and my connections were shitty.

Re:OBD2-->OBD1 ?
 

Nice 60 bucks thanks for the find.

I'm gonna wait until Xenocron gets his. He said he was gonna get one from Jkobdconversionharness.com I'll see how Chris likes it, and if its good then I'll get one from there since he does match any price.

Thanks!

Re:OBD2-->OBD1 ?
 

He shipped mine today...ill let you know when i get a chance to put it in a test it out. ;)