2110 twin idf 40"s - what AFR should I be aiming for?.

davegeezzer · Samba Member Joined: December 18, 2011 Posts: 14

Hi guys just bought a innovative LM2 to tune my engine properly as up until now I've just used the colour of the plugs !!,But what values should I be aiming for from what I've read on here idle/ progression should be lean 14 and 17-8 progression for cool running. Thanks in advance Dave

sallittjob · Posted: Wed Jul 29, 2015 8:03 pm Post subject:

I'd strongly suggest reading this thread in it's entirety:http://www.thesamba.com/vw/forum/viewtopic.php?t=293837
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VWCOOL · Posted: Wed Jul 29, 2015 8:55 pm Post subject:

Petrol: 12.5 1 at WOT/max power is a good number

all other (part throttle) conditions - the numbers are largely irrelevant; tune as lean as the engine will cope with to ensure good driveability

Dale M. · Posted: Thu Jul 30, 2015 6:35 am Post subject:

Ideal is around 14.7 bit probably next to impossible to attain with carbs and maintain through out power band, shoot for around 13.4 to 14 and walk away...

if you want perfection or closer numbers ditch the carbs and go EFI...

Dale
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for a tuning rookie, aim for 13:1 for everything off idle. Set idle by LBI ONLY.
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jason · Posted: Thu Jul 30, 2015 8:26 am Post subject:

How much does one jet size usually change the afr? I'm way rich, 12's with 55's and wondering if I should jump to 45's. I know small changes.

[email protected] · Posted: Thu Jul 30, 2015 8:54 am Post subject:

assuming you are referring to idle jets (you didn't say), a change in jet size around "2" will do that. Change from 55 to 53 or so (52.5?).
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jason · Posted: Thu Jul 30, 2015 9:46 am Post subject:

Yes, idle jets. A change of 2 will do what? I'm low 12's now at idle.

davegeezzer · Samba Member Joined: December 18, 2011 Posts: 14

Thanks for your replys everyone !, I'll start reading that thread Sallittjob !!, at least I know what I'm aiming for know !. I've just built this engine for EFI/turbo but I'm running it N/a u till I get the rest of my bits together. Cheers Dave

[email protected] · Posted: Thu Jul 30, 2015 12:45 pm Post subject:

Your idle jet doesn't control the idle A/F. Read the thread.
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jason · Posted: Thu Jul 30, 2015 12:56 pm Post subject:

I read it. If my LBI and off it is 12, how do I make it leaner? I'm not following something.

[email protected] · Posted: Thu Jul 30, 2015 1:18 pm Post subject:

Obviously you skimmed. Read it again.

If you catch yourself getting "bored" or overwhelmed, go do something else to clear your head and then come back to it. Don't be afraid to read it multiple times until you "get it"
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jason · Posted: Thu Jul 30, 2015 2:28 pm Post subject:

I thought you meant this thread.

webebuggin · Posted: Thu Jul 30, 2015 4:13 pm Post subject:

Follow what Mr Connelly says, READ the thread, I must have read it a dozen times, before I "got" it, My 2110 now idles (hot) at 14, cruises at 16-17+, runs cool, has good power, 44 idf's 36 vent, 50 idle, 150 main 200 airs on f11 tubes, This of course done with a Innovate LM1, and ALOT of time and questioning John...A WEALTH of info... Read up, and follow o young Skywalker....

jason · Posted: Thu Jul 30, 2015 7:09 pm Post subject:

I got all of what he wrote, I just wanted to know how much the afr changes on average with a jet change of 1 point.

VWCOOL · Posted: Thu Jul 30, 2015 8:27 pm Post subject:

modok · Posted: Thu Jul 30, 2015 9:45 pm Post subject:

stan_tichomirov · Posted: Thu Jul 30, 2015 10:45 pm Post subject:

The thread suggested to be read is listed in second post, the Wideband Tuning thread.

What size venturies? One safe next step may be going to 52 idles. Take the emulsion tubes out, drive on idles only, see what it reads at light throttle cruise.

You know you'll want to try smaller idles anyway, if you are only ordering one set try 52s. If you want a wider range, get 50s and 52s.

Stan
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