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Old 02-11-2010, 07:32 AM   #1 (permalink)
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I Have A 1988.5 Samurai Not Lifted With 215/75 Tires And A Weber Carb.all I Can Get Out Of It Is 18mpg Is This All It Should Do? If Not Give Me Some Ideas
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Old 02-11-2010, 08:33 AM   #2 (permalink)
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With larger than stock tires and a weber you are almost in the right ballpark. You should be at around 22mpg. Also depends on your driving style.
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Old 05-11-2010, 08:15 AM   #3 (permalink)
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Quote:
With larger than stock tires and a weber you are almost in the right ballpark. You should be at around 22mpg. Also depends on your driving style.
So the people claiming the weber carb improves performance AND mpg are wrong?

Also when one increases the diameter of the tires would that not drop the rpm's a bit and increase the mpg's?
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Old 05-11-2010, 09:18 AM   #4 (permalink)
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MPG for the weber is only slightly higher than the stock setup, but when you go to larger tires you decrease that number dramatically. Stock everything - and in perfect condition - you should be getting 28-29mpg. When I went to 31" tires and stock everything else - it went down to about 17-18mpg. Larger, heavier tires will do that. A weber will bring that back up, but not all the way. It will also increase the feel you get when you step on the skinny pedal. Although it doesn't match Suzuki's original efficiency, folks use it as a cheap way to regain some lost mpg and power.

The only carb setup that I have seen to come close to stock mpg while using aftermarket gears and bigger tires has been the Harley carb conversion.
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Old 05-11-2010, 09:26 AM   #5 (permalink)
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I Am Getting Around 20-21 Mpg Now.the Person I Bought It From Did A Bad Job Installing Th Weber.it Was Leaking Air Everywhere.took It Off And Put It Back Like It Should Be.fixing To Put A Header With 2" Exhaust I Think This Will Help.it Is A Money Pit But I Love It.
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Old 05-11-2010, 10:49 AM   #6 (permalink)
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its a money pit, but when you look at the cost of a newer vehicle and the repairs and maintenance on it, you're ahead with a samurai. It's the most cost effective vehicle I have owned, and I've owned a lot of different cars and trucks.

Vacuum leaks are really comon on them. The adapter plate screws like to back out, and the only way to get at them is to remove the carb. When you install one or work on one, its a good idea to use a little RTV on the threads to keep them from backing out on you down the road.

The stock carb is limited on it's response and low end because of the emissions requirements and fuel efficiency requirements. The Weber cuts all of that out and gives you a little more power and faster throttle response. The weber however, doesn't adjust it's fuel according to the driving conditions, air temperature and pressure. If you change climates and altitude, you need to manually adjust your weber for that. A properly adjusted weber will get pretty good MPG but if it's not adjusted correctly it will suck gas like crazy. You'll still get great power out of it, but at the expense of fuel consumption. If you take advantage of the lower end power and the faster throttle, you will negate any saving in fuel efficiency.

I just drove mine with the jets it came with and it worked out great. I only got about 18-20mpg with my 32s but that was because I liked to feel the extra kick off the line. I got even less fuel efficency with my mikuni dual side drafts, but that was mostly because I couldn't keep myself from sticking my foot through the floor and getting pushed back into my seat. I'm back to my stock carb now and I'm making about 20mpg on 32's but much less kick off the line than I had with the weber or the mikunis. I figure if I can't control myself, I better restrict myself.
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Old 05-11-2010, 11:23 AM   #7 (permalink)
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i love the thing it will run 65mph on the highway. I dont do it very often dont want to tear up anything.will the header help? I heard it would help the hp just not sure how much. i just painted it real tree camo with a stencil kit and it turned out awsome.Now all my buddies want me to do theirs but it is alot of work.
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Old 05-11-2010, 11:36 AM   #8 (permalink)
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A header and a 2" exhaust will do you good. And it will sound a bit better than the current 'honey bee on steroids' sound.
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Old 05-11-2010, 07:12 PM   #9 (permalink)
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wow, i run about 20mpg with stock engine & carb, stock exhaust (only for 2 more weeks ) 215/75 tyres and a 2" lift... and it actually doesnt make a difference whether i drive like a granny or a leadfoot, theres barely any difference... maybe its time for me to look into a rebuild... or a 1.6, either way
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Old 05-17-2010, 08:48 PM   #10 (permalink)
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I have an '86 tintop with a Weber, performance cam, GM alternator, stock tire size, and headers - gets 28 now that the weather is warmer up here (N. Idaho). Vastly improved performance over stock (managed 85mph on a windless level stretch). I use a Holley fuel pressure regulator to get 3.5 psi at the carb.

Last edited by marty3d; 05-17-2010 at 09:52 PM. Reason: additional info
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