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[udidwht]

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Jetting changes.

For example, people think nothing of going from 50 to 55 or 60 in one jump. That's a 10 and 20% increase in jet, and a 20 and 40% increase in fuel!

That's the same as going from a 150 main to a 165 or 180 in one jump, it's crazy.

If the rings go away from being too rich, often they will re-seal when you get the A/F back in line to where it should be, and the oil has a chance to line the cylinders again. But understand that gas is NOT a lubricant, and the rings are taking a beating during this rich period.
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[Hella-Buggin']

Wow, I started this thread six years ago and it's still going.
John, you should print it and sell it as a carb tuning bible.

I don't have my bug anymore but I do miss the smell of tinkering.

Keep up the good work fellas!

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I like giving advice for free. It's very rewarding when people actually follow it too!
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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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[theDrew]

I have a question for those more experienced than me --- How do I know that I can "trust" my o2 gauge?

If I try to tune by the feel, its saying I'm running rich, but the engine sounds and feels better. AFR is 11-12.

When I rejet it to what I think it should be based on the o2 meter, the engine seems to be running lean. AFR is in the 13-14.

My engine:

2276, 9.4cr, fk8.
Weber 44 IDF's
started at 60/160/200.
tuning w/ my o2 sensor I ended up at 57.5/150/205. That'd put me at an AFR of 13ish most the time.

But power seemed to fade a bit, so I went back to 60/160/200 and the engine looses its crispness sound but seems to have more power. But my AFR says I'm in the 11's.

Granted I dont know what I'm doing, so maybe someone can guide me.
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

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if it runs better "richer", you likely have too much ignition timing. Rich mixtures burn slower, so the additional advance "wakes it up".

What distributor and timing do you have?
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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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[theDrew]

[theDrew]

John, If I was to start mucking w/ the timing, should I pull the entire map back 1 degree at time?

Thanks already, your explanation makes a whole lotta sense!
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[[email protected]]

But that doesn't answer my question. What is the timing at idle, and what is it at 3500 RPM?

[manx#3094]

I have a 1641cc with a 110 cam, MegaJolt controlled EDIS ignition and dual Dell DRLA 36mm carbs. The carbs have had the Vent's opened up to 32mm. Currently I have 180 airs, 160 mains, 57 idles and 9164.2 Emulsion tubes. I have a flat spot that I can see go lean on my AFR around 2500 RPM, most noticeable in 1st gear, however, it's there in all gears.
My 55 mph cruising AFR is around 16.5 or so.
I think I need to go a little bigger on my air jets to bring in the mains earlier in hopes of "filling" in the flat spot.
My question is: should I order 190 or 200 mains?
Or, am I off base on this line of thinking?

My ignition map looks like this:
---- 500 800 1200 1600 2000 2400 2700 3100 4200 5500 RPM
10 - 8** 10** 20** 26** 30** 33** 35** 36** 38** 40*
20 - 8** 10** 20** 26** 30** 33** 35** 36** 38** 40*
30 - 8** 10** 20** 26** 30** 33** 35** 36** 38** 40*
40 - 8** 10** 20** 26** 30** 33** 35** 36** 38** 40*
50 - 7** 9** 19** 25** 29** 32** 34** 35** 35** 38**
60 - 7** 9** 19** 25** 29** 32** 34** 35** 37** 38**
70 - 7** 9** 19** 25** 29** 32** 34** 35** 37** 38**
80 - 7** 9** 19** 24** 28** 32** 34** 35** 37** 38**
90 - 6** 8** 18** 24** 28** 31** 33** 34** 36** 37**
100 - 6** 8** 18** 22** 28** 31** 33** 34** 36** 0**
LOAD

Thanks!

[Casting Timmy]

[theDrew]

[Casting Timmy]

So what does the 60-100 represent on the chart above? Also what are the negative numbers above it?

[theDrew]

[Casting Timmy]

You might start reading at page 7....I thought you wanted your max timing above loads of 75%. It's also interesting to me that at your max load your timing goes up and then goes back down.

It will be interesting to see what others say as I only know from reading.

Also the Type 3 section of this forum has FI guys...you might ask them about your timing map.

Have fun bugging
Tim

[Casting Timmy]

Another question / comment would be how you set timing? IE does your idle really have 15 degrees? I would assume you have to set the distributor still for the timing map to be correct.

Also a lot of guys are running 8 degrees around idle and go up to 28 or 30 degrees total timing for a load. If they have a vacuum advance distributor they can get some extra timing during part throttle conditions.

Edit to add:
I would put a timing light on it and check your idle timing and max timing to make sure it aligns with your map.

[theDrew]

The timing table is the absolute timing as the distributor is locked out. I've checked and rechecked the timing a few times and its spot on.

I'm more interested in tuning the table now -- again, this is CB's default map, and I've taken to trying to redo the whole thing to my RPM range (6500) a few times but chickened out as I dont know what I'm doing
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[ps2375]

How is the "load" sensed? What units are those numbers representing?

[theDrew]

[ps2375]