Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC: Wideband AFR Gauge on the Cheap (no more butt dyno)

Wideband AFR Gauge on the Cheap (no more butt dyno) 02 Mar 2018 19:19 #779674

  • Saablord
  • Saablord's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 86
  • Thank you received: 2
I never wanted to deal with trying to butt dyno a bike, so I put a bung (actually four, one for each runner) into my exahust to get a read out on the air/fuel ratio of the engine. You'd probably be safe with one sensor as carb screw settings rarely ever change between cylinders.

I bought a bosch lsu 4.9 wideband sensor from ebay and a SLC free wideband controller . If you get the sensor used, the whole thing will run you about $70. If you wanna go cheaper, you can typically find the controller as a kit or just the boards on ebay for cheaper though your electronic skills need to be pretty good to go that route.

The other option is just buying a new wideband sensor kit from AEM or Innovate, but these can be pretty pricey at ~$200. You can find these for ~$100 used on forums and maybe ebay. These kits are just different controllers but use the same 4.2 or 4.9 bosch wideband sensor.

After you get all that setup, its just a case of running your engine, looking at the reading, and tweaking the carbs until the AFR is where you want it. 14.7 is stoichometric and you dont want to go above that: you'd want to be around here for a cruiser. 13.3 or so is best for power.

Here's what the AEM kit looks like:
Attachments:

Please Log in or Create an account to join the conversation.

Wideband AFR Gauge on the Cheap (no more butt dyno) 02 Mar 2018 20:05 #779676

  • loudhvx
  • loudhvx's Avatar
  • Offline
  • Sustaining Member
  • Sustaining Member
  • Posts: 9570
  • Thank you received: 1094
I love the innovate LC 1 I bought 10 years ago. It really saves time in getting precise jetting.

Please Log in or Create an account to join the conversation.

Last edit: by Patton. Reason: "pre use" corrected to "precise"

Wideband AFR Gauge on the Cheap (no more butt dyno) 03 Mar 2018 18:52 #779711

  • Saablord
  • Saablord's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 86
  • Thank you received: 2
What AFRs do you go for? Mine are about 13.6

Please Log in or Create an account to join the conversation.

Wideband AFR Gauge on the Cheap (no more butt dyno) 04 Mar 2018 03:00 #779720

  • loudhvx
  • loudhvx's Avatar
  • Offline
  • Sustaining Member
  • Sustaining Member
  • Posts: 9570
  • Thank you received: 1094
Different throttle positions have different purposes. In the light throttle range for cruising I find I end up around 14. At the extreme end of the power range I end up sweeping through 11.5 to around 13 as the rpms reach redline. I have a thread here somewhere with more details, but it was so long ago, I think the images are gone.

I've only afr tested mechanical carbs. CVs might behave differently.

My previous post was autocorrected "precise" was changed to "pre use".

Please Log in or Create an account to join the conversation.

Last edit: by loudhvx.

Wideband AFR Gauge on the Cheap (no more butt dyno) 04 Mar 2018 06:21 #779723

  • CoreyClough
  • CoreyClough's Avatar
  • Offline
  • Member
  • Member
  • GPz550 Addiction
  • Posts: 1095
  • Thank you received: 70
www.innovatemotorsports.com/products/db.php

A friend of mine has been tuning his CV32, 1984 GPz550 with 12:1 Pistons, and Web Camshafts (410 lift). He says the Innovative LC1 has helped him better understand tuning. He only has one sensor to the mid-pipe. From where he though it was tuned, wasn't close when he added the wide band. I bought this an LC! from Innovative off Ebay, but have yet to install it. CV Carbs are different running than that of mechanical, and tuning is different.

He says tuning the carbs for the street is ideal, as we are not even close to constant full throttle on the street. Cruising, we are about 1/8 throttle opening as Lou says.

$155.00 on Ebay:



Just for the record, I am not associated in any way, with that company. :P


.
'85 GPz550(ZX550-A2)

GPz550 Base Manual --> tinyurl.com/ze5b3qo
GPz550 Supplement Manual --> tinyurl.com/h34d2o6
GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp
First Race Win GPz550 --> tinyurl.com/o5y3ftp
The following user(s) said Thank You: loudhvx

Please Log in or Create an account to join the conversation.

Last edit: by CoreyClough.

Wideband AFR Gauge on the Cheap (no more butt dyno) 11 Mar 2018 08:39 #780062

  • 4TheKZ1000
  • 4TheKZ1000's Avatar
  • Offline
  • Member
  • Member
  • Posts: 4
  • Thank you received: 0
Stay away from WEGO products...in my opinion.....over-priced junk, no tech support and many compatibility issues for a Kz.

Please Log in or Create an account to join the conversation.

Wideband AFR Gauge on the Cheap (no more butt dyno) 11 Mar 2018 08:47 #780063

  • Patton
  • Patton's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 18882
  • Thank you received: 2110

loudhvx wrote: . . . My previous post was autocorrected "precise" was changed to "pre use".


Previous post edited accordingly.

Good Fortune! :)
1973 Z1
KZ900 LTD
The following user(s) said Thank You: loudhvx

Please Log in or Create an account to join the conversation.

  • Page:
  • 1
Powered by Kunena Forum