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Date:         Tue, 8 Apr 2008 14:11:16 -0700
Reply-To:     Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Subject:      Re: 4 pin fuel pump relay(s) question.
Comments: To: neil N <musomuso@gmail.com>
In-Reply-To:  <c4e7c5f90804081359n7e4346fdq243b0af90be8bb08@mail.gmail.com>
Content-Type: text/plain; charset="us-ascii"

Sounds very good. Yup, 83 to 85 1.9 waterboxers use a single wire 02, And the next step up from that is the 3 wire one, and two of those are just for 02 heat, to keep it hot enough to always give a nice output.

I just tested a new one I put on an 87, and oddly, at first it was 'stuck' at .9 volts -like full rich perhaps. After while though, it was really switching fast, going from .2 to .9 volts a few times a second practically.

An OBD-II SVX Subaru has 3 oxygen sensors, one for each back . Yeah, dig that, individual mixture adjustment/feeback PER BANK . and you better get the right 02 wires going to the right bank ......otherwise it gets very confused, and being OBD-II there's one sensor after the cat too. All fun. Glad to hear your putting the ecu under the back seat. Keep up the good work. Helps to be on another phase of the job, eh ? Sounds like the discouraged phase is past now. Scott

-----Original Message----- From: neil N [mailto:musomuso@gmail.com] Sent: Tuesday, April 08, 2008 1:59 PM To: Scott Daniel - Shazam Cc: vanagon@gerry.vanagon.com Subject: Re: 4 pin fuel pump relay(s) question.

Thanks Scott.

For sure am putting ECM under rear seat. Already have a hole leftover from the gas heater for wires to run through.

I didn't know Vanagon (post '86) had *heated* O2 sensors.

I guess I could run wires forward for relays, but they should be fine in the engine bay. If I had any doubts about crap getting in the relay box, I sure wouldn't put them there! --- :^)

Neil.

On Tue, Apr 8, 2008 at 1:34 PM, Scott Daniel - Shazam <scottdaniel@turbovans.com> wrote: > Ok, that makes sense. > In 86 and up vanagons )2 heat is supplied by the same relay that powers up > the ECU I believe. Easy to check on a Bentley diagram. > But having a separate relay for that function is fine. > > I have the biggest firmest rule in the world about not letting ANYTHING go > until the new engine conversion is perfectly working and all sorted out, > like a few months worth. > I use many of the stock waterboxcer parts on Subaru conversions, engine > upgrades from 1.9 to 2.1 etc. > Sometimes I get 6 to 8 parts reused in the new engine conversion. > > Sure, you can stuff your relays in the black junction box. > > I also........in Subaru conversions, I put the two relays under the back > seat next to the ECU. That works quite nicely. Keeps the engine compartment > clean looking, and puts the relays where no road junk or moisture can get to > them. I wouldn't consider putting the ECU anywhere other than under the rear > seat btw. > Scott > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > neil N > > Sent: Tuesday, April 08, 2008 1:03 PM > To: vanagon@GERRY.VANAGON.COM > > > Subject: Re: 4 pin fuel pump relay(s) question. > > Hi Scott. > > 3rd relay is for the HO2S (heated O2 sensor) > > The Jetta uses a fancy schmansy O2 sensor with a heater element. > > Thanks for the confirmation and tips. > > Unfortunately I didn't keep the "high voltage" box from donor. Sold it > with engine. Luckily I had the sense to keep the black junction box > from WBX donor. It looks like it seals properly. Should suffice for > relays. > > Neil. >

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