23-06-2014, 01:40 PM
Where this was coming from is that on a fairly standard engine, using the LDA to add fuel off boost would see an increase in acceleration, increase combustion, revs and wind the turbo up faster.
I don't really think it applies to VNT's and large out of scope changes.
It's using vacuum to suck the LDA down, off boost, where as on boost the LDA pin would be pushed down to add fuel.
It's a way to get into boost faster and increase off boost power (through fuller combustion of available air) on a fairly stock engine/pump.
Akin to changing the max fuel screw on demand, as you can turn the vac off too.
Now I've messed with the LDA pin on the Mrs corsa by rotation which has changed the slope of the pin and has also affected off boost due to where it's sitting without boost as it's now adding fuel off boost.
I can see how this would be of use without going VNT.
But VNT is infinitely better.
I don't really think it applies to VNT's and large out of scope changes.
It's using vacuum to suck the LDA down, off boost, where as on boost the LDA pin would be pushed down to add fuel.
It's a way to get into boost faster and increase off boost power (through fuller combustion of available air) on a fairly stock engine/pump.
Akin to changing the max fuel screw on demand, as you can turn the vac off too.
Now I've messed with the LDA pin on the Mrs corsa by rotation which has changed the slope of the pin and has also affected off boost due to where it's sitting without boost as it's now adding fuel off boost.
I can see how this would be of use without going VNT.
But VNT is infinitely better.