258 Carter BBD to a Weber 32/36

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COLORADOCRAWLER
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258 Carter BBD to a Weber 32/36

Post by COLORADOCRAWLER »

This was originally a PM to Stuka and he wanted me to open a thread for discussion so here goes:

I saw you have a Weber carb on your 258 in your signature. I have a new Weber Carb for my YJ's 258. Traded an almost new Edelbrock 650 CFM for it. I'd like to know if you are happy with it and what drawbacks if any. i.e. does it run ok at extreme angles ect. Planning on swapping out my Carter BBD POS in the next week or so and just wanted to know if you ran into any problems with the swap. It didn't come with any jets and I'm at over 5600 ft so I'll have to figure out which jets to use to lean it out. I was justs hoping to get it running in the next week or so and tune from there. Thanks. :-bd
-Rick
87' GW 5.3/4l60E/NP241C, Dakota Digital dash, high steer, 31's, still needs a bigfoot gas pedal to tie it all together.
90' YJ 3 link coils front, 4 link double triangulated coils rear, D44s, ARBs, 4.56, 35's
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Stuka
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Re: 258 Carter BBD to a Weber 32/36

Post by Stuka »

Yeah even though its for a YJ, it applies to FSJ's too.

Overall, I love it. Had it on the truck for nearly a decade now. I am assuming the one you have a 32/36 DGEV? This is the one I have.

If you have only the bare carb, and not the Jeep specific model, you will need a few things. There is an intake adapter, and there is a linkage adapter. You need both, and both are available from http://www.carbs.net (They have a huge section for the Webers). They also have the jets intended for a 258. I lived at 4k ft and worked at 5ft for years, and it worked well for me. I have been as high as 6500ish with no major issues, but it was most likely a bit rich.

I also strongly suggest a fuel regulator. I ran without one for a LONG time. But I always had issues with a stumble at idle and running a bit rich. Turns out the stock pump was pushing fuel past the needle and seat. A regulator set to 3psi resolved these issues, and Weber specifically states that a regulator must be used. I just never figured how much the stock fuel pump puts out. Turns out it will hit 12psi. I also lowered the float, as the stock setting its pretty high and results in flooding out on inclines way too easily. With the float dropped a bit, its much better. Also if offroading, you can drop the fuel pressure down to 1.5psi and this helps prevent flooding out even more. But you may starve for fuel at WOT.

Also if need be, I have the full manual scanned in the event you do not have it. Tuning a Weber is very different from an Edelbrock or Holley. The DGEV Webers are basically two carbs grafted together. You have a low speed circuit, and a high speed circuit. This means you need to tune it in a specific manner. Which is not difficult at all, just different.

Back when my J10 had stock gears, no lift, and 31's, I could easily get 17mpg out on the freeway. Now I get way worse, but thats to be expected with my setup.
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Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ
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COLORADOCRAWLER
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Re: 258 Carter BBD to a Weber 32/36

Post by COLORADOCRAWLER »

I do have the DGEV and I got the conversion kit. Looks pretty complete, minus a jet kit to tune it. I forgot to ask about the regulator it calls for but you answered that one. 3 PSI seems really low, even for a mechanical pump , compared to the 55-60 PSI for my Vortec. My engine has quit a bit of blow by from the valves (long story) so I'm thinking about making a "slobber" reservoir rather than dump that junk back into a nice clean carb.

We all hate the Carter BBD but it has never left me stranded and continues to run at really crazy angles. I am on my 3rd one in 14 years. They always start to dribble fuel and idle rough and then the accelerator pump conks out and it stumbles at tip in, and is perpetually over fueling in limp home mode but......I have ALWAYS been able to get that turd started and its never left me walking. I'm just hoping for a little something better until I Vortec the YJ too. :evil:
-Rick
87' GW 5.3/4l60E/NP241C, Dakota Digital dash, high steer, 31's, still needs a bigfoot gas pedal to tie it all together.
90' YJ 3 link coils front, 4 link double triangulated coils rear, D44s, ARBs, 4.56, 35's
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Stuka
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Re: 258 Carter BBD to a Weber 32/36

Post by Stuka »

No comparison between the BBD and the Weber. Your drivability and performance will go way up. Plus the Weber sounds really cool :)
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Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

kyamcalvert
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Re: 258 Carter BBD to a Weber 32/36

Post by kyamcalvert »

What regulator do you run? I had a crappy Mr. Gasket one on there for a while. Started to leak, so I took it off. Also, what pump? Stock?
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90supra
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Re: 258 Carter BBD to a Weber 32/36

Post by 90supra »

Anyone have pictures of the weber set-up on the 258? I haven't looked around yet but since this thread bumped up I'll just ask. Also Weber 32/36 DGEV or MC 2100? Managed to get the weber for free attached to a 258 manifold but without linkage
The Fleet:
1967 J3000 (258/T18/D20, MC 2100)
1972 240Z (heading under the knife :evil:)
1978 Corvette (wife's HS project)
1987 Grand Wagoneer (Howell TBI 360 HEI, Thorley headers, Edelbrock intake, 727 NP208, Rustys 4")
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Re: 258 Carter BBD to a Weber 32/36

Post by Stuka »

I use a Holley adjustable fuel regulator with a gauge hooked up to it. I have it set to 3psi per the Weber spec.

Photos of linkage can be seen in this post: http://fsjnetwork.com/forum/viewtopic.p ... F36#p60453
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ
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