Author Topic: improving fuel economy? (Read 5214 times)

phreak97 · « **on:** July 26, 2008, 04:44:15 PM »

i know it's not the normal kind of thing you find in a tuning section, but i'm interested in making my car go better without making it use more fuel.. or at least keeping it the same while using less fuel.
i'm about to try removing the breather pipe from the air filter (and installing a breather filter instead) to see if the pure clean air (not recycled) makes it run nicer.. but i dont know of much else that can be done..
any ideas?

Gordan · « **Reply #1 on:** July 26, 2008, 06:32:56 PM »

repairing your carb would surely improve the economy a little, over here we have shops that specialise in carb repairs, and you can find repair kits on the net...

www.classicfiat.com item 5065 Carburetor repairing kit IMB 28, 36.52â‚¬

phreak97 · « **Reply #2 on:** July 27, 2008, 03:26:02 AM »

i didnt know my carb was broken:/ i think it just needs to be machined underneath..
i did win my car club economy run this year, i think my car is working relatively fine with a stock setup, i was just intersted in know how i could push it further.
by the way classicfiat.com doesnt seem to exist anymore:(

Gordan · « **Reply #3 on:** July 27, 2008, 07:47:33 AM »

well id dint say it was broken, just dont know the right word for it, mines is not broken too, but it gozzles a lot of fuel, so ill go to the shop to have it repaired, whatewer, i dont really know what they do to the carb, just know that the man at the carb shop told me he could improve my fuel economy, it being 8-9l/100km

i googled the classicfiat yesterday and it worked fine? and today nothing

phreak97 · « **Reply #4 on:** July 27, 2008, 11:34:04 AM »

ah, i know what youre saying now, i might buy a kit and see how it goes:)
i found a couple on ebay anyway.

Gordan · « **Reply #5 on:** July 27, 2008, 04:45:01 PM »

:smt023

Darrell · « **Reply #6 on:** July 29, 2008, 05:05:58 PM »

From what I understand, the jets wear over time.

I bought a new carb for a Datsun I had years back and it improved the car's economy amazingly. :cool:

phreak97 · « **Reply #7 on:** July 29, 2008, 05:24:49 PM »

yeah, but how much is a new carb for a 126 going to cost me?
i actually need a second one anyway, i've got an engine i'm building up.

Gordan · « **Reply #8 on:** July 29, 2008, 06:58:15 PM »

axel gerstl - 166â‚¬....

dajwid · « **Reply #9 on:** July 29, 2008, 07:02:17 PM »

166€ :shock:

Blimey. Allegro about Â£15

Gordan · « **Reply #10 on:** July 29, 2008, 07:15:39 PM »

:shock: right

dajwid · « **Reply #11 on:** July 29, 2008, 09:01:46 PM »

I have seen a 126 with an LPG tank in the back :

:

phreak97 · « **Reply #12 on:** July 30, 2008, 02:56:57 AM »

dajwid, if you can get me one for 15 ill pay you for it.

fightingtorque · « **Reply #13 on:** August 29, 2008, 11:40:28 PM »

I am running a wideband lambda sensor on mine just to see how the mixture is set up on the carb, as I am going to fit fuel injection.

The stock carb (of course they all vary) is running pretty lean on the primary choke, about 1.15 lambda which I guess is close to optimum, but as you get the second choke cracked open the mixture richens very rapidly - it quickly progresses to a power mixture of about 0.8 lambda with any reasonable amount of opening.

So if you concentrate on driving without using the secondary choke you should see a good improvement in fuel consumption, but it won't go so fast.

Ignition timing - more advance generally helps as long as it isn't getting into knocking.

Raise the tyre pressures a bit will help but the handling will be different and will detriorate if you go too far.

phreak97 · « **Reply #14 on:** August 30, 2008, 04:25:11 AM »

i dont know anything about primary and secondary chokes, or lambda sensors.. fitting fuel injection sounds like a fun idea.. it would certainly be unique among my local fiat 500 club. i'd imagine theres a fair bit of modification involved though? where are you going to find a fuel injection system for a 2 cylinder? and how does it connect up?
and most importantly, how much would parts for such a thing cost?