Spark plug pics, Dual IDF jetting questions

[mazza89]

Hey everyone, been a while but the beetle is finally on the road. I had a chance to take it to the flashlight drags this weekend the day after I got it on the road. Now on to some tuning.

Quick run down on the important specs
2276
9.5:1 compression
Scat c45 cam/1.25 rockers
Steve tims stage 2 heads

MSD Pro-billet distributor
Summit CDI box
48kV coil
D6EA plugs

HPMX/IDF 44 carbs with 38mm venturis

1.65 Main jets
1.90 air correction
F11 emulsion tubes
- Have the rest wrote down somewhere but cant find it at the moment - I believe they are the standard HPMX dual carb setup.

Running 3 PSI fuel pressure on a Holley red pump.

Here are pictures of the two plugs I pulled:
cylinder 2 - https://imgur.com/a/YpuS6mL
Cylinder 4 - https://imgur.com/a/9qTvbAw

The vast majority of runtime on these plugs are at wide open throttle - 50 miles driving followed by 10 1/8th miles pulls at wide open.

Note - I was cramped for time and the idle is way too high ~1550rpm currently so keep that in mind. Currently trying to nail down the jetting and timing at WOT.

Thoughts on the plugs and the jetting/timing? I was thinking it could use to move up a size in the main jets and the timing seems to be about on or maybe needs to be retarded just a bit, but I am new to reading plugs and would like some input.

Thanks!

[[email protected]]

you are way rich, try 150 mains, no bigger than 155.
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[sled]

get a Wideband, you'll love it.
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drive your split.

[andreas5bmw]

Stop playing around and guessing ,,,everyone has different answers,,,,get a wideband you will never look back

[mazza89]

I plan on a wideband in the future but that doesn't solve now.

John - looking at some charts i see that it is rich don't know what I was thinking last night. Do you recommend playing with the air correction hers at all? I have 155 and 200 airs laying at the house

[[email protected]]

You need to read the wideband thread. Try the 155 mains, it will be an improvement.

Also, just because there's a "chart" somewhere, don't assume it is accurate. Most aren't.
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It's just advice, do whatever you want with it!

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[sled]

[mazza89]

The chart was the spark plug color charts and reading about the timing and all the different things you can find out from it.

Without a doubt I plan on getting a wide band as well as getting back on the dyno. Trying to do what I can until then.

I will give the 155 a shot and see how it is. Everything is much better since the upgrades over winter. Didn't get to turbo or fuel injection but this is a good start.

[tattooed_pariah]

I'm curious why the wideband thread isn't pinned to the top..

I've never managed to dig through all 100 pages of it myself, but apparently it is a tuning bible.. It's too bad there isn't some way to organize it so it's actually usable without spending weeks sifting through it...
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'72 Volksrod "Effigy"

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[[email protected]]

I have a condensed version written up, but I need to finish editing it.
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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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[Olli from NJ]

[mazza89]

Switched to the 155 jet. Here are the after photos for cylinder 3. Not these are the same plugs not sure if they are accurate or if I would need to start fresh.

Got the idle adjusted and everything synced and set. I am having an issue when increasing the throttle where it falls on it's face when you give it abrupt gas from ~2000 rpm. Thinking it could be accelerator pump or still stop rich or too rich idles. Any ideas? Should I increase the air jet to 200 from 190? I do not have any smaller mains at the current time.

[mazza89]

Correction - cylinder 4

[67rustavenger]

[APPLEGREENVW]

[[email protected]]

Put the 200 airs in, see how it does.
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It's just advice, do whatever you want with it!

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[earthquake]

What "Idle" jets do you have? 44 hpmx's should have 55 idle jets, try a set of 60's Have you tried adjusting the acc pump to give it a bigger pump shot when you jump on it off idle? did you swap out the vents for 38mm's? stock should have been 36mm. try running it with 36mm's and see how it runs
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74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
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[mazza89]

Following up on this - the Air correction jet change to 200 did not make any noticeable change on the plugs but there does seem to be a flat spot from 5500-6000 rpm now. Probably going back to the 190.

I believe the idles are 55, I have not yet adjusted the accelerator pump but that is going to be my next adjustment this evening. I think it does need a bigger shot. Probably will not invest in any more jets until I get a wideband or take it to an engine dyno when I pull the engine to have the trans fixed.

I did crank the engine over to see how the spark looks... WOW. from a puny barely firing blue coil to a cdi 48kv coil is impressive.

[udidwht]

52 idles. You're still rich. Keep the 200 airs in.
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1972 Westy Hardtop/Type-4 2056cc
96mm Biral AA P/C's~7.8:1CR
Headflow Masters New AMC 42x36mm heads w/Porsche swivel adjusters
71mm Stroke
73 Web Cam w/Web solids
Dual 40mm IDF Webers - LM-2 - 47.5 idles/125 mains/190 air corr./F11 tubes/28mm Vents - Float height 10.45mm/Drop 32mm
Bosch SVDA w/Pertronix module (7.5 initial 28 total @ 3400rpm)
Bosch W8CC plugs
Pertronix Flamethrower 40K coil
S&S 4-1 w/Walker QP 17862
3 rib 002 Trans
185R14 Hankook tires

[andreas5bmw]

Get a wideband,,,,I think your to lean if it falls on its face,,,the last 2275 I built made 200hp on 200 air and 180 main many hours on the dyno