What spring have you got in it?

The stiffer one, yellow. I have the green one as a spare though.

Anyluck with this pal as im looking into getting one

Sorry abit of a novice question,

What does this actually do? does it just alow the user to lower and higher the boost of the turbo?

any more info on this? i fitted mine a few days ago. set it up with the standard spring that comes with it and set it to have 2-3mm of preload on the spring. Just wondering how is best to inscrease the boost pressure?

Just for peoples info:

1. i had to drill out the mounting holes for the actuator as they didnt quite line up on the vl38 turbo.

2. 2-3mm of preload is the standard setup for the actuator

3. the spring pressure ratings are as follows

green = 5 -10 psi
yellow = 9 -15 psi
blue = 14 -18 psi
red = 17 -20 psi

the actuator comes with the green one unless you specify otherwise which is fine for a standard setup but not for mapped cars

edit: does anybody know if the actuator for the punto is a piston or diaphram system so i can order the spring kit?

Bump

Has anyone else fitted one of these? Im about to swap the spring inside mine to the yellow one

Any one got more info on these?

Whats a safe pressure to take the vl38 up to?

Does it stop the turbo from spooling up as fast as well?

JackFi said:

Any one got more info on these?

Whats a safe pressure to take the vl38 up to?

Does it stop the turbo from spooling up as fast as well?

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i have just stripped and replaced the spring in mine ready to re-fit tomorrow. The pressure to run the vl38 up to is really about 1.4 / 1.5 bar but i wouldnt go past 1.3 if you want it to last a long time.
the ecu must be tuned to work with the actuator and the spring pressure must be calibrated or the ecu doesnt like it and sticks the engine management light on and puts it into limp mode. Stick with the spring that is supplied with the actuator and there will be no need for this. The actuator only controls the pressure that the internal wastegate will open at, it has no bearing on spool up times. What it does is allow you to fine tune the pressure you want to boost up to by changing the internal spring and it also will allow for smoother and more constant boost pressure

Thanks for your info mate. You reckon I would need another map twaek to get it to work then? I might message tony to see what he says anyway.

Don't want to argue with you rich, but I've got the stiffer spring in my actuator and it's fine. Holds the boost a lot better than before, no engine management light or limp mode from it.

DlightSwitch said:

Don't want to argue with you rich, but I've got the stiffer spring in my actuator and it's fine. Holds the boost a lot better than before, no engine management light or limp mode from it.

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Are you running it with the yellow spring david?

Shadeyman, that's the actuator.. Yep.

Vance said:

Are you running it with the yellow spring david?

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Yes Kieran. Green one is standard, yellow is next one up.

DlightSwitch said:

Don't want to argue with you rich, but I've got the stiffer spring in my actuator and it's fine. Holds the boost a lot better than before, no engine management light or limp mode from it.

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Your running the VL36 turbo though arent you? Which is designed to boost to a slightly higher peak pressure than the VL38.
Im not saying that you cant use the higher spring rating but it needs to be fitted while the car is being mapped, the ecu wont like it if its not mapped to the stronger spring. I would only try the stiff ones out first on the rollers to avoid damaging the turbo.
The VL38 can produce good power with the weakest spring

Im confused now, because its the ecu that reads back the boost pressure, so when I got the car map tweaked surely tony would of put up the boost pressure for overboost.

JackFi said:

Im confused now, because its the ecu that reads back the boost pressure, so when I got the car map tweaked surely tony would of put up the boost pressure for overboost.

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yes which is why you could use the standard green spring without problems if especially if you have a map - i will try and put it simply

if you try to increase the boost pressure with the actuator, the ecu will not like it as the boost is exceeding what it is programed to reach. Therefore it will cut the fuelling/put into limp mode to try and controll the boost. You need to tell the ecu that the boost pressure is going to be higher.

Sorry I do understand why it would happen but I thought when I had the car map tweaked it would be programmed higher thats all.

JackFi said:

Sorry I do understand why it would happen but I thought when I had the car map tweaked it would be programmed higher thats all.

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it proably will be but you need to find out what it is set at to make sure the actuator spring rate is correct