[projectzook]

Im having issues with my carby. Nothing major just im using a bit more fuel than i should be. Granted the economy wont be what it used to be when she was a baby, but i feal it should be less than it is. Im getting approx 300 kms out of a 40lt tank. When she was a baby i could get 420kms and that was giving it s#*t. now the 300kms is driving miss daisy. I know i have put a 1600 and big tyres with series 3 rockhoppers and a set of try y extractors but im looking for better economy. Now my options that i have come across so far. a reco carby, single point injection, 16 valve head reco EFI or the 16 valve twin cam reco head EFI. All with very different price tags. Now i have a reco 1600 with a 1300 head. sligtly bored shaved you know all the jazz thats gets done on a reco. I would like to know if anyone has done these conversions have they been happy. Do the benifits outway the costs. Would i be better with a reco carby and save money or go the full hog. would going the 16 valve twin cam reco head be worth it (cost vs performance vs economy). Any and all thoughts are welcome and would be hugely appreciated.

thanks again

[royce]

mate I reckon EFI will do SFA for you, there are a few things you need to look at 1st to determine where the fuel is going.

1st up, is 300km off the odometer or actual worked out from how far out you are with the bigger tires (31's will mean you are travelling about 15% further that the ODO says, transfer gears might make the revs right for speed but wont make the odo and speedo accurate
also are you getting bang on 300km to 40l? IE your hitting 300 and running out of fuel or hitting 300 and the gauge is empty? take not of how many litres you need to get back to full, mine hits the empty mark with 32l gone not 40l.

what kind of driving do you mainly do? if your in a lot of stop start and traffice your tires will be dragging you down, not for diameter but the tread lugs suck power and the weight affect of bigger tires are multiplied 4 fold as they are rotating not static weight
if you do a lot of highway then the tread of the tires still isnt helping but the lift means you have a lot of frontal area thats pretty vertical trying to push through the air, I used to find with mine I could tow a pretty heavy trailer and highway economy didnt change as it was the wind resistance not any type of engine trouble

something to ponder, vitaras use less fuel than a sierra with a bigger and more powerful engine, mainly because of the shape, even with lift and 31's that can maintain even 400km to 40lt but put that engine in a sierra and it will be worse

plus the cost has to be factored, you loss of economy is costing you what about $20 every 420km, efi conversion is almost $2k in real terms, thats a lot of extra fuel (in my case would take about 2 years to pay off)

[projectzook]

That is exactly the kind of answer i was looking for. Thanks for being honest. Now the 300kms is a educated guess. The odo says 260kms sometimes and others 250kms. Now im running 32's. When my speedo reads 85kmph my gps says 100kmph. so is that aprox 15%. My driving normaly is just to work and back. I just got another daily driver so that not an issue ne more. But the prob starts when im driving to a club meet. Say that its in brunswick thats approx 3hr drive in a zook. 250kms approx. I would of almost gone through a tank just getting there. so i need to take a jerry can and refuel. I do those type of trips prob 1 to 2 times a month.
With my current carby. I havent ever had ne flooding issues, The probs i have had, stalling accationaly on steep slopes when going very slowly. then having trouble restarting. and i had an issue for a while when i had a broken gasket on the carby with water and the like getting in and not allowing it to idle. But that had been sorted and never happend again. what im pondering is that when im rock climbing and doen steep climbs very slowly would i benifit from efi. for the fact that i wouldnt get gravity issues?

[royce]

the carbys can get problems on angles and if they get shaken up but I think it might have a bit to do with age than design as most people that strike such problems and get their carb professionally rebuilt seem to never have a prob again

and a 70l tank will solve the range issue

EFI would be a bonus off road in the really hard stuff though

[projectzook]

Yeah the 70lt tank would fix the range issue. One of my options is a completely overhauled carby. Which is by far the cheapist. which im kinda leaning to because if i have carby issues out on the track i can usualy get the zook running again. Were as if i have efi i wouldnt know what to do to. but efi would benifit me when im doen the hard stuff which im now heading into. So many options. I found a fuel consumption calculator and im using approx 12lt per 100km. Now thats no were near as bad as i thought it was. So i now think that my issue isnt as bad as first thought. I also checked thye tyre pressure today and they were very low. woops. thanks again ne other info i should consider.

[royce]

with series 1, 31" MTR's, 2" lift, 2" bodylift I used to get about 11 -12/100km with an ok carb and tuned alright so you arent far off really

[magnat]

EFI should also stop over reving on down hill decents??

[projectzook]

royce wrote:

with series 1, 31" MTR's, 2" lift, 2" bodylift I used to get about 11 -12/100km with an ok carb and tuned alright so you arent far off really

Yeaj i now relise that. It felt like i wa majorly out but not realy. its probably what it should be. I might just get my carb looked at and serviced a see how that goes. I got to remember that im running 32's and rockhoppers!!!