MegaSquirt, revisited ... Options

[Brad Roberts]

Most of the mufflers fit the rear valence really tight. Not much room to add 1 inch and another gasket.

I do like the idea however.

The Triad muffler could have dual O2's mounted to it. He uses a "squished" collector where the HE's meet the flange.


B

[Charles Deutsch]

... I just ordered a wideband O2 sensor kit and I need to build my own harness.

Where did you buy this sensor kit? How much was it? Do you have a link?

[DNHunt]

I put mine in the collector prior to the muffler so I could get all 4 cylinders.

The resistors are in series with the injectors to limit the current to them. 6 ohm works finr but they have to handle a fair amount of power therefore 10 watts. I got them at the local electronics store (not Radioshack) asked for 6 ohm 10 watt. No problem. I 'll look tonight for a part number

[seanery]

I don't really see the difference. If you mount it in the muffler, then it's an average of the four cylinders.
If it's on one of the 4 he pipes its accurate for 1 cylinder. Which is worse?

[mightyohm]

I don't know what muffler I have but there is a collector like the Bursch. Maybe it's a Bursch setup with a different muffler welded in. I need to take a closer look.

[Brad Roberts]

Sean.. you could have 3 lean cylinders and not know it (by reading only two or one of them).



B

[DNHunt]

Guys get under the car and see the first place where all the pipes come together. Select a spot where the O2 sensor is vertical or nearly so. Take the muffler off an take it to a muffler shop and have them weld in an O2 bung. Cost me 20 bucks at a Walt's. Wire it up.

I did a second bung out the back at the same approximate spot for the sensor at the dyno spot. That way I could calibrate it relative to the dyno. Mine was spot on.

A stock system with the fueling map installed should run well without O2. The D-jet does. I haven't looked at any O2 figures since June.

Any changes from stock would require O2. Maybe it could be an option that could be added

Dave

[mightyohm]

I am hoping to use my wbo2 setup as a tuning tool and substitute for a dyno. Now I can use my day to day driving as a dyno setup to check mixture etc. It will help me make sure D-jet is working right and if I ever switch to megasquirt it will help me set up the tables. (But I would probably need a few dyno runs at that point.)

[3d914]

stock system with the fueling map installed should run well without O2

Dave, I agree with you here. I'm planning my first go-around with the MS as an open-loop system. With a little dyno time to work it out across the load and temp ranges, I hoping for more flexible results than the D-Jet can give me with this WEB #73 cam.

Thanks for checking on the resistors for me. Was it an electronics chain store? An what type of casing do the resistors have? - I've seen several types.