Isn't a Set Gain of 0.65bar very very low? Surely thats not utilising the turbo ptential you have much at all?

Chris

My previous settings, for 1.3 bar were:
Gain 17%
Set Gain 1.20
Set 52%

This gave me full boost around 3500rpm.

Changing the Set Gain from 1.2 to 0.40 made no difference.

I have now changed to
Gain 22%
Set Gain (irrelevant, swapped between 0.4 and 1.2)
Set 52%

This gives me full boost around 3000rpm.

This is the thing I don't understand!!

The graph still look ok and mine has a broader torque range etc, so what is the Set Gain actually doing?! To me, it seems that the turbo starts working as soon as the boost hits the base level of the actuator where as with Webbo's, it doesn't start working until it reaches the 1.2bar that his is set to, which obviously takes longer to achieve. What are the adverse affects of having a low set gain if any?!

Cheers,

Mark

Mark - have a look at what I read, it might help?



What I dont get is how the Start Boost can be close to the Set boost, one is like 0.4-1.2 the other is 50% or whatever so how can they be close to eachother. Have I missed something

Mark I think you might have it upside down mate The turbo will start working immediately because the wastegate will be closed until the Greddy tells it to open, therefore I dont think "Start Boost / Set Gain" will affect spoolup.

Here's my (limited) understanding- the Start Boost / Set Gain is designed to overrule the actuator setting so if you have a 0.6bar actuator, you could put the Start Boost to 1.2 and it should keep the wastegate closed until that pressure, thereby allowing you to hold more boost later on. Maybe that's why yours, set at 0.65 or something, is tailing off later in the rev range?