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chittychittybangbang
Samba Member
Joined: August 12, 2006
Posts: 194
Location: portland, or
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 Posted: Wed Apr 03, 2019 9:54 pm Post subject: Tuning the Webor IDF for better fuel economy |
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Has anyone done this who is out there in samba land? Never owned a Webor IDF but would love to get into them if I could improve my fuel economy.
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If your into busses youve got issues and you likely don´t know it yet. - El_Güero
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Vanillagurilla
Samba Member
Joined: November 21, 2017
Posts: 1061
Location: California
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| Posted: Thu Apr 04, 2019 2:22 am Post subject: Re: Tuning the Webor IDF for better fuel economy |
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| You really need a wideband to tune anything in general but in the 20+mpg range with duals is pretty common. |
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APPLEGREENVW
Samba Member
Joined: November 30, 2003
Posts: 2387
Location: Seekonk,Massachusetts USA
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15298
Location: Deep in the 405
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| Posted: Thu Apr 04, 2019 7:48 am Post subject: Re: Tuning the Webor IDF for better fuel economy |
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Believe it or not you can get better MPG with dual carbs than with any single carb. If you are wanting to use just a single IDF then there is no magic in them.
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15982
Location: North Florida, USA
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| Posted: Thu Apr 04, 2019 11:49 am Post subject: Re: Tuning the Webor IDF for better fuel economy |
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Here's a thread on MPGs with different engine/carb combos.
https://www.thesamba.com/vw/forum/viewtopic.php?t=493938
It is a bit dated so some of the numbers may have changed with the use of modern fuels (ethanol enriched), but from a quick review it appears stock engine combos (with vacuum advance distributors) may squeak out more MPGs than dual 2bbl carbs. Most duals seem to have MPGs in the mid 20's while stock 1bbl carbs are in the upper 20s to mid 30s for freeway miles.
Of course... YMMV.  
I recall an old article about someone building an ACVW engine (in a Ghia?) designed for MAX fuel economy getting 40MPG+(?). There is a magazine article on it somewhere?
This is NOT that article but I found this on the aircooled.net site:
http://www.aircooled.net/vw-type-1-mileage-engine-mpg/
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AshMan40
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'67 Beetle #1 {project car that never made it to the road  }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15982
Location: North Florida, USA
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| Posted: Thu Apr 04, 2019 12:12 pm Post subject: Re: Tuning the Webor IDF for better fuel economy |
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I found another thread on MPG and some links to the article I recalled....
https://www.thesamba.com/vw/forum/viewtopic.php?p=2978005
| Jimmy111 wrote: |
You mean this one?
I bought the kit including the cam and Miler manual many years ago. Ill look for the manual but I do know where the cam is. |
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AshMan40
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'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26776
Location: Colorado Springs
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| Posted: Thu Apr 04, 2019 5:06 pm Post subject: Re: Tuning the Webor IDF for better fuel economy |
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Yeah there are a FEW "MPG nuts" as I call them, running IDfs.
Probably the smarter variety of them.
36 idfs tuned for lean cruise, and a GOOD adjustable ignition system, should be able to beat or equal any other setup for MPG. Really.
And someday, far in the future, you'll save enough gas to recoup the cost.
BUT IT DOESEN"T Matter, do it cause it feels good! |
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15982
Location: North Florida, USA
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| Posted: Fri Apr 05, 2019 6:45 am Post subject: Re: Tuning the Webor IDF for better fuel economy |
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There is a statement in this article that it is possible to get good MPG from a Weber progressive (DFEV 32/36) carb by tuning the primary barrel for very lean cruise and set up the secondary for power on demand. This seems like a very good idea giving you the flexibility for fuel savings as long as you can keep your "lead foot" off the pedal.
The only downside is the challenges that come with keeping the progressive intake hot enough to prevent fuel condensation. This requires heat risers from the exhaust manifolds, or some other heating systems for the intake.
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AshMan40
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'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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