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Author Topic: Wideband AFR install!  (Read 292 times)
Otus511
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« on: June 21, 2017, 04:01:43 AM »

Just thought i'd share my latest accomplishment with the crowds---

Bought an AEM x-series AFR meter with a Bosch LSU4.9 wideband sensor.
Installed into exhaust after 4-1 collector and just before the center stand, below the swing arm pivot.
Mounted display off left handle bar and connected power off the teeny tiny fuse box below the seat.


First start up instantly found my idle air/fuel ratio to be a little rich (around 12.5-13) and wide open throttle pulls to be wildly lean(15-16:1)!!!

I'm running a DIY foam air filter with no snorkel, and stock exhaust with the ol' holes in the baffle trick for 'noise'

I'm also running a jet kit from 6Sigma direct off eBay for around USD$120.
-38 pilots, mixture screw 1-3/4 turns out
-110 main jets on carbs #1 and #4
-112.5 main jets on carbs #2 and #3
-2 shims under each needle

If anyone is at all interested in the install or want any more photos (some photos to come), comment and I'll happily help!
I hope someone is a little interested Cheesy Cheesy
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Otus511
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« Reply #1 on: June 21, 2017, 04:10:40 AM »

Here's some photos

...excuse the quality.


* Optimized-DSC_0309.JPG (124.15 KB, 450x313 - viewed 52 times.)
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a_morti
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« Reply #2 on: June 21, 2017, 04:14:42 AM »

Cool!

What's the plan then? Up a size on mains, air acrews back out to stock setting 2.25 would be my starting place. Don't really need bigger pilots and adjusted air screws, it seems.
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Cam Drive Gear Train Smiley
Otus511
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« Reply #3 on: June 21, 2017, 04:20:55 AM »

Next plan is to try lean out that idle mixture a tad with the mixture screws.
Idle hunts a lot, around 200rpm fluctuation

Then, up a few sizes in the mains to try get the WOT back down to around 12.5:1

I'm hoping it's not fuel pressure dropping too much when I rev it out?


* Optimized-DSC_0310 (1).JPG (50.32 KB, 300x168 - viewed 50 times.)

* Optimized-DSC_0311.JPG (102.91 KB, 450x253 - viewed 50 times.)
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a_morti
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« Reply #4 on: June 21, 2017, 04:49:51 PM »

Looks to be idling very low. Should be 1,300 +/-100. It'll idle more even that way!
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Cam Drive Gear Train Smiley
Otus511
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« Reply #5 on: June 21, 2017, 05:47:02 PM »

Looks to be idling low because it's not actually running Undecided

The afr is just left over exhaust fumes
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ModerateFkr
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« Reply #6 on: June 21, 2017, 07:10:21 PM »

This looks handy. Useful diagnostics. Thank you for sharing Otus511
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