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+--- Thread: De-tuning a xud for economy? (/showthread.php?tid=22331)
De-tuning a xud for economy? - Andy annear - 19-03-2014
Ok, I know this is a gay thread, but I seem to be spending all my time filtering WVO atm and its starting to grind... Currently tuned to 'stage one' 18psi, and down to about 36 mpg driving very steadily, this seems pretty low to me?
So my question, what do people remember to be getting standard from a bosch'd xud? I m running 100% wvo so pointless having it tuned as she wont pull smooth all the way through the rev range, so this weekend i wanna put it back to standard, or could i go below standard to get epic mpg's???
Cheers,
Andy
RE: De-tuning a xud for economy? - Eeyore - 19-03-2014
Yeh thats fairly low... Why dont you just buy veg oil ready to go than filtering old stuff? Itll still be cheaper and you wont have to waste your time!
RE: De-tuning a xud for economy? - Jonny81191 - 19-03-2014
Have you tried changing the fuel filter? If that's blocked, it'll ruin your economy.
RE: De-tuning a xud for economy? - Anton - 19-03-2014
Serviced it lately? What tyre pressure do you use? What type of journeys do you do? Carrying any unnecessary weight?
Boost makes diesels more economical... I've never averaged 36mpg even whilst trying. I am using 100% new oil, occasionally some diesel or petrol.
RE: De-tuning a xud for economy? - zx_volcane - 19-03-2014
hate to be mr obvious, but maybe try turning the pump down turn or a half?
smoke doesn't tend to be so obvious on veg, so you may well be overfueling for the amount of boost you're running
RE: De-tuning a xud for economy? - Andy annear - 19-03-2014
Thanks for responses guys,
Driving is to the beach and back 90% of the time, includes some dual carriageway driving and using A or B roads, avoid towns at all times,
SROWELL I pay 25p/litre for WVO so its alot cheaper than I could get new stuff for,
Tyre pressures are all good, think theyre about 32-34 last time I did them,
Serviced it a few thousand miles ago, havent done fuel filter since but do have a brand new one so will bang that on at weekend when i return her to standard fueling etc,
What kind of MPG's do you guys all get/would expect to get on standard engines if theres any of you left lol
Cheers again!
RE: De-tuning a xud for economy? - laurence_13 - 19-03-2014
mines standard and the most I've had out of a brimmed tank was just over 500 miles on normal diesel
not sure what that works out at.That was mostly B road runs + short journeys... just done a mpg calculation thing and it's just over 40 mpg apparently
RE: De-tuning a xud for economy? - Piggy - 19-03-2014
My tuned Stg1 24psi xud turbo with an 11mm pump still did well over 55mpg on a run and never less than 45mpg when ragging...all on wvo.
Same with my 2.1 now really.
Something isnt right there mate, but at 25p a litre...36mpg is still a HUGE saving of say 45mpg at 1.38 a litre!
RE: De-tuning a xud for economy? - Chris_90 - 19-03-2014
25p per liter?! I say stop moaning and turn it up some more
But on a serious note I'm same in my 106 last lot of veg was 30ppl but I'm down to 41mpg in a 106 nad that's terrible defo must be broken
RE: De-tuning a xud for economy? - anto - 19-03-2014
A big turbo with fuelling to match is quite economical if you have any sense when driving it.
I get about 550-600miles to a tank driving normally ie not planting it at every opportunity.
Detuning wont do much except bore the f*ck out of you and cause you to have to floor it to get the bastard to move!
RE: De-tuning a xud for economy? - ally406 - 19-03-2014
If it isn't pulling cleanly all the way through the rev range then you have fuel starvation and/or air ingress somewhere. What sort of quality is the WVO? Check all the fuel pipe joints, the primer bulb and filter housing. 10% petrol halves the viscosity of vegetable oil, this might improve running, or see if you can source some misfuel. 2EHN cetane booster should see further improvements and bump mpg and power a little. No need to de-tune, try and find the source of the problem. I've averaged 45mpg in my 406 over the last 40,000 according to my logs, mostly at 20psi. 80% WVO 20% misfuel + 2EHN cetane booster and it will happily rip through the revs to the governor.
RE: De-tuning a xud for economy? - Andy annear - 20-03-2014
WVO is filtered to one micron, she will pull clean through 1st and second but begins to bog slightly in 3rd, 4th and 5th, im guessing when its sucking the most fuel??
I have got some cetane booster so will dump that in and change fuel filter and see how it goes over the next week, cheers for all the suggestions guys
Andy
RE: De-tuning a xud for economy? - Anton - 20-03-2014
I'd whack some petrol in it tbh.
RE: De-tuning a xud for economy? - Piggy - 20-03-2014
Sounds like poor quality wvo, defo some petrol and a filter change.
When was last time you cleaned the in tank strainer?
RE: De-tuning a xud for economy? - Andy annear - 20-03-2014
Never cleaned the in tank strainer, checked it after first few tanks of veg but looked fine to me, im reluctant to put petrol in it, it may just be by chance but in both my 106 and this 306, shortly after putting petrol in with the veg my glow plugs shat themselves, no idea if petrol could cause that but didnt seem to help with much tbh with starting etc, but then again everyone cant be wrong!
RE: De-tuning a xud for economy? - Chris_90 - 20-03-2014
I've run 10% petrol maybe more some times all winter with out issue probably just coincident that it's happened.
RE: De-tuning a xud for economy? - Piggy - 20-03-2014
Ive done, well, must be 50k miles on wvo/svo with 5-10% petrol with no issues at all. Yes too much will cause issues. If you are worried just put in a litre for every 20 of wvo, which is what I do. Along with a splash of two stroke oil and cetane booster
But the in tank strainer is a possibility. For the sake of 10mins, its worth a check.
I aslo change my fuel filter about every 2k miles.
RE: De-tuning a xud for economy? - Andy annear - 20-03-2014
Cool ok, i'll do these at the weekend and report back in a week or so
Thanks all
RE: De-tuning a xud for economy? - Tom - 20-03-2014
Id ditch the standard fuel filter. I dont understand how veg can flow through that maze at any speed whatsoever. When i was on the TT inline filter i used to get the problem you described when the filter was blocked, switch it out and at full power again for christ knows how long lol.