13-06-2014, 10:59 PM
The idea of LDA is to REDUCE fuel off boost because of smoke, but it's finely calibrated...
If you left the max screw alone, I reckon you'd make about a 5hp gain by only playing with the LDA... If that in honesty. When you then attempt to wind up the max fuel, you'll realise that the LDA yes has a bigger effect, but most of the time is a hindrance and also has the problem of actually starving the engine of fuel in places it needs it - going back to the calibration...
What sort of things are you considering as "massive" - I mean, I'm talking trying to control ~150+HP of fuel on LDA - it won't happen, you'll be jamming the LDA every time you put your foot on the pedal there'll be that much spring tension from the governor, this is half the reason people moan that XUDs sometimes perform amazingly, but other times just "don't go" because the LDA jams - seen it before now on shimmed governors where someone nails their foot to the carpet and bends the governor cradle from the force placed on it because of the increased spring tension!
LDA is designed to work in a very small range - if you go ahead and start playing with the fulcrum points inside the pump, you could get things vastly better, but most of the time people will realise that they can't mat their foot anyway, since if they do, it's a gigantic cloud of coal... Might as well sack off the jamming problems and just do the whole lot with your foot.
Turning off the LDA for economy just doesn't work like that, you'd end up reducing the fuel quantity and make the engine incapable of utilising the torque provided by the increased fuel quantity at lower RPMs when the turbo works... You'd have to rev harder to get the power... Kinda the same reason why when I fitted my 2052V the economy when not being driven hard was a genuine 58mpg... The turbo is there make the engine more efficient.
If you left the max screw alone, I reckon you'd make about a 5hp gain by only playing with the LDA... If that in honesty. When you then attempt to wind up the max fuel, you'll realise that the LDA yes has a bigger effect, but most of the time is a hindrance and also has the problem of actually starving the engine of fuel in places it needs it - going back to the calibration...
What sort of things are you considering as "massive" - I mean, I'm talking trying to control ~150+HP of fuel on LDA - it won't happen, you'll be jamming the LDA every time you put your foot on the pedal there'll be that much spring tension from the governor, this is half the reason people moan that XUDs sometimes perform amazingly, but other times just "don't go" because the LDA jams - seen it before now on shimmed governors where someone nails their foot to the carpet and bends the governor cradle from the force placed on it because of the increased spring tension!
LDA is designed to work in a very small range - if you go ahead and start playing with the fulcrum points inside the pump, you could get things vastly better, but most of the time people will realise that they can't mat their foot anyway, since if they do, it's a gigantic cloud of coal... Might as well sack off the jamming problems and just do the whole lot with your foot.
Turning off the LDA for economy just doesn't work like that, you'd end up reducing the fuel quantity and make the engine incapable of utilising the torque provided by the increased fuel quantity at lower RPMs when the turbo works... You'd have to rev harder to get the power... Kinda the same reason why when I fitted my 2052V the economy when not being driven hard was a genuine 58mpg... The turbo is there make the engine more efficient.
