Wideband reading dirrerences?

[saw2]

Just installed new engine want to start tuning with a AEM wideband. I have not used a wideband a lot, but have read wideband posting several times and think I have a good grasp on the procedure.

I now have a chrome 1 1/2 Tri-Mil header with muffler. I don't want to weld a 02 bung in and ruin the chrome finish. So I purchased a used Tri-Mil stinger section from Samba classifieds. It has a Super Trapp setup welded on the end
I have crudely welded a 02 bung for sensor.

My question is will the different exhaust flow am I going to get different afr readings and settings due to using the temporary stinger set up and then going back to the muffler setup for normal street use?

Also how is this for jetting starting out at sea level elevation. Here are engine specs.
Weber 40 IDFs. 32 venturi. F11 e tube
52 idles
135 mains
200 air
2180 cc
8.8:1 comp ratio
40×35 mild ported heads
CB 2242 cam
1:1 ratio rockers
AC.net SVDA Bosch 034 distributor
1 1/2 Tri-Mil header

[miniman82]

I doubt it, but you'll get more HP with a proper muffler than you will that supertrap. Think about the name for a second...
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Build thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=212747

[mikedjames]

It could make a difference if it restricts flow to the the point the exhaust stroke fails to extract as much from the cylinder as with the normal setup. So then the next induction stroke might have a little less O2 getting in because of higher pressure in the cylinder so might indicate leaner.

But as a general tool it will work and you will learn a lot if you can manage to drive without constantly staring at the gauge while you are in the real world accelerating hard towards something slow moving in front.

My PLX devices AFR meter with sensor welded into my stainless exhaust has saved me the cost of rolling road tuneups and let me instantly spot that there is a problem with a carburettor jet or an air leak.
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Ancient vehicles and vessels

1974 VW T2 : Devon Eurovette camper with 1641 DP T1 engine, Progressive carb, full flow oil cooler, EDIS crank timed ignition.
Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
Gearbox rebuild 2021 by Bears.

1979 Westerly GK24 24 foot racer/cruiser yacht Forethought of Gosport.
1973 wooden Pacer sailing dinghy

[saw2]

I will only use the stinger with Supertrapp temporarily while wideband tuning. Then going back to the chrome muffler set up. Am just concerned if it would cause different afr readings between the two exaust end section styles

I never really thought about until now, but I could also cut off and replace with a small muffler of some type. Not concerned about looks as the stinger set up is only temporary. Or even just take off Supertrapp and go with straight stinger.

Going to try stinger with Supertrapp and then with Supertrapp plates and end removed to see if there are any differences in afr readings.

[henk]

Can't really see it but can you not use something like this?
Then you can tune it with the muffler you gonna drive it and you don't have to weld.
http://vwparts.aircooled.net/Oxygen-Sensor-Adapter-Pipe-Small-3-Bolt-Flange-p/o2adapter.htm

Henk!!!