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the2ndcashboy Samba Member
Joined: March 19, 2007 Posts: 827 Location: Houston
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Posted: Tue Jul 26, 2016 4:46 pm Post subject: Re: Wideband Results |
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You shouldn't be using your idle mixture to fix a decel problem. Set your idle by the LBI procedure and then fix what's causing the popping (timing, exhaust leak, etc) _________________
SRP1 wrote: |
You see....... He talks in code and translation requires a priest, geologist, astronomer, biophysicist, and Indiana Jones. |
modok wrote: |
If anything comes out perfect it just means your measuring tools are substandard. |
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Motor60 Samba Member
Joined: July 13, 2014 Posts: 625 Location: SoCal
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Posted: Wed Jul 27, 2016 6:47 am Post subject: Re: Wideband Results |
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Do what I do. Just start from scratch. Unbolt exhaust check your gaskets. Put in the metal gaskets. And re tighten. Then try again. Make LiL changes at a time. I bet it's an exhaust leak if u have paper gaskets |
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stan_tichomirov Samba Member
Joined: May 24, 2005 Posts: 1719 Location: San Francisco, CA
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Posted: Wed Jul 27, 2016 8:52 am Post subject: Re: Wideband Results |
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Exhaust leak is not the issue, there is more fuel getting in at idle than I think there should be and I need to figure out why. Not a huge issue, car runs great otherwise, just idles at 12:1 AFR.
Stan _________________ Aircooled.net
Jansen Enterprise
My 1835cc build
My budget 2276 build |
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ps2375 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Wed Jul 27, 2016 9:02 am Post subject: Re: Wideband Results |
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I have seen a few motors(not ACVW motors, but motors) that will not idle easily at AFR's leaner than 12's and possibly 13's. To get them there, you will need to add air and even some timing advance. And maybe even up the idle RPM a bit. |
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stan_tichomirov Samba Member
Joined: May 24, 2005 Posts: 1719 Location: San Francisco, CA
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Posted: Wed Jul 27, 2016 9:12 am Post subject: Re: Wideband Results |
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So, with 54 idles I had it idling in 13s, but I had idle screws turned in a bit and timing down to like 2. Progression holes were still closed I believe. I actually like it better the way it is now, and idle is lower -- just the 12AFR.
Stan _________________ Aircooled.net
Jansen Enterprise
My 1835cc build
My budget 2276 build |
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ps2375 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Wed Jul 27, 2016 11:30 am Post subject: Re: Wideband Results |
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Idle feel can be as subjective as what oil to run....if you are happy with your cars idle, stick with it.
On mine I was noticing that I was getting sooty at the exhaust tip, so I turned in the idle mixture screws to lean it out some. I run with the air screws closed, and just double checked the balance with the snail gauge, all is good and idle only varies with ambient air temps.
I need to get a new sensor for my WB to actually know where things are falling, but I am pleased with current running conditions and will pretty much leave things as they are. |
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stan_tichomirov Samba Member
Joined: May 24, 2005 Posts: 1719 Location: San Francisco, CA
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Posted: Wed Jul 27, 2016 11:48 am Post subject: Re: Wideband Results |
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I wonder if it's time to try backing out air bypass screws a bit.
Stan _________________ Aircooled.net
Jansen Enterprise
My 1835cc build
My budget 2276 build |
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ps2375 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Thu Jul 28, 2016 6:36 pm Post subject: Re: Wideband Results |
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stan_tichomirov wrote: |
I wonder if it's time to try backing out air bypass screws a bit. |
Not an especially easy thing to do, as those screws are in close quarters the the side of the engine compartment. And then you'll need to be able to adjust them for balance. I closed mine for all of these reasons, until I possibly add "Weber Windows" in the future. |
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Motor60 Samba Member
Joined: July 13, 2014 Posts: 625 Location: SoCal
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Posted: Thu Jul 28, 2016 6:50 pm Post subject: Re: Wideband Results |
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I have tall manifolds now. But deck lid hits the passenger side air cleaner top and it causes lid to misalign. And I'm too much OCD to leave it like that.
Question is if I put in regular height manifolds will I have to retune again?? Will it run richer or leaner? |
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stan_tichomirov Samba Member
Joined: May 24, 2005 Posts: 1719 Location: San Francisco, CA
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Posted: Thu Jul 28, 2016 7:52 pm Post subject: Re: Wideband Results |
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Non-offset ones? You could use standoffs to move the lid back.
Stan _________________ Aircooled.net
Jansen Enterprise
My 1835cc build
My budget 2276 build |
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Motor60 Samba Member
Joined: July 13, 2014 Posts: 625 Location: SoCal
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Posted: Fri Jul 29, 2016 8:20 am Post subject: Re: Wideband Results |
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Yes they are straight manifolds. And that was my dilemma. Bottom of deck lid is propped for summer cooking. But now that I have motor tuned correctly I assume it will run cool enough that I can close lid again. Main reason I propped lid was because I have a convertible. And it blocks air when top is down. But now it should be ok right? |
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jason Samba Member
Joined: August 07, 2002 Posts: 3444 Location: Garage
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Posted: Fri Jul 29, 2016 10:01 am Post subject: Re: Wideband Results |
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Depends on year. Early vert with doghouse will need more air. Late vert with doghouse should be fine. |
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rbp Samba Member
Joined: January 13, 2011 Posts: 70 Location: Ottawa Canada
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Posted: Tue Aug 02, 2016 9:02 am Post subject: Re: Wideband Results |
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Well still working on things. Here is where I am at now. Engine is 2316 type IV, 200 HP & 200 ftlb torque, distributor is a Unilite with mechanical advance only. Timing set at 900 RPM idle 8 deg. Idle jets .50, mains at 145 and AC at 240.
Runs pretty well with slight hesitation at around 2000 RPM. My concern is that when I cruise in 4th gear I read high 13 to low 14 on the LM2. If I could get that down to low 13 I think I'd be set. Any thoughts on the A/F ratios at cruise? Is high 13 and low 14 problematic? |
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[email protected] Samba Member
Joined: August 03, 2002 Posts: 12785 Location: Salt Lake City, Utah
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Posted: Tue Aug 02, 2016 9:27 am Post subject: Re: Wideband Results |
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Try a 52.5 idle and reset LBI. _________________ It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
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rbp Samba Member
Joined: January 13, 2011 Posts: 70 Location: Ottawa Canada
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Posted: Tue Aug 02, 2016 9:54 am Post subject: Re: Wideband Results |
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I ran with .52 idle jets. It brings everything down (3rd gear 3000 rpm etc.) from high 12 and low 13's to high 11 and low 12's. It does bring the 4th gear cruise at 3000 to 3500 to low 12's rather than the high 13 low 14's I get with the .50.
Am I better to stay with the .52 and richer burn all around than the .50 idle where everything is high 12 low 13's but highway cruise is high 13 and low 14? |
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[email protected] Samba Member
Joined: August 03, 2002 Posts: 12785 Location: Salt Lake City, Utah
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Posted: Tue Aug 02, 2016 10:13 am Post subject: Re: Wideband Results |
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offhand I'd say your air jets are too big, and you are double metering fuel in the 2500-3k range from progression and main. Try to go back to 200 air and 52.5 idle, and see how it behaves. _________________ It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
"Like" our Facebook page at
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rbp Samba Member
Joined: January 13, 2011 Posts: 70 Location: Ottawa Canada
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Posted: Tue Aug 02, 2016 1:33 pm Post subject: Re: Wideband Results |
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I went with the large AC to try and get the mains in sooner so that while cruising on the hwy at 3000 & 3500 I would get out of the low 14 and high 13 to low and mid 13. That was my hope but didn't get me there.
Is high 13 and low 14 a bad place to cruise at steady speed on highway? Just worried about heat. |
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[email protected] Samba Member
Joined: August 03, 2002 Posts: 12785 Location: Salt Lake City, Utah
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Posted: Tue Aug 02, 2016 1:37 pm Post subject: Re: Wideband Results |
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That's a stupid question, because it means you haven't read this thread. _________________ It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
"Like" our Facebook page at
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and get a 5% off code for use on one order for VW Parts ON OUR PARTS STORE WEBSITE, vwparts.aircooled.net |
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rbp Samba Member
Joined: January 13, 2011 Posts: 70 Location: Ottawa Canada
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Posted: Tue Aug 02, 2016 3:27 pm Post subject: Re: Wideband Results |
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Well, from what I have read some opinions are that light load cruise at the high 13 and low 14 is ok. The idle is suggested to be low 14 when set-up for LBI. I suspect from what I've read that low 14 under load would be a bad pace to be. I suspect low 14 is also not preferred in my situation but thought I'd ask anyway. |
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[email protected] Samba Member
Joined: August 03, 2002 Posts: 12785 Location: Salt Lake City, Utah
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Posted: Tue Aug 02, 2016 3:30 pm Post subject: Re: Wideband Results |
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As stated 20x in this thread, centrifugal only engines should be 12.8-13.2:1 for everything but idle, which is normally best at mid 13s.
I can't tell you how frustrating it is repeating the same thing over and over because people are either too lazy, or are reading it but absorbing zero. _________________ It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
"Like" our Facebook page at
http://www.facebook.com/vwpartsaircoolednet
and get a 5% off code for use on one order for VW Parts ON OUR PARTS STORE WEBSITE, vwparts.aircooled.net |
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