A wastegate actuator question.....

[oblark]

I`ve been doing reading on wastegate actuators and have discovered that they come in different psi ratings.

My question is this :- What is the rating for a "standard" actuator ??

And when running high boost (18 psi plus) do I need a high rated actuator ???

[AndysR]

Isn't the rating of the actuator the rating that the spring will hold boost until without assistance from a bleed valve or other additional boost control. In theory if your bleeding boost pressure away from the actuator there is no reason to upgrade it as it will only start to open once the pressure between the actuator and boost controller exceeds the spring strength, that said if your running high boost levels then your better off with a stronger actuator/or spring but it can cause boost spikes depending on the style of boost control you have.

[p fandango]

I`ve been doing reading on wastegate actuators and have discovered that they come in different psi ratings.

My question is this :- What is the rating for a "standard" actuator ??

And when running high boost (18 psi plus) do I need a high rated actuator ???
a standard T-5 actuator is something silly like 3psi, but relies on the BCS to stop it opening to raise the boost. Stock 19t actuator is around 10psi. I've got a Kinugawa adjustable actuator & springs ranging from 0.3-1.7bar (2bar is available), i'm going to use that to control the boost level instead of the Apexi AVC-R as it'll give alot more aggression

http://i791.photobucket.com/albums/yy196/pedro-fandango/Volvo/mine/BT/turbo/20t/IMG_1237_zps62143b65.jpg

[M-R-P]

5psi for almost all but the k series which I believe to be 6psi.

I'll bring the test rig on Sunday mate.

[oblark]

I was wondering if the wastegate actuator was weak that could be why I lost boost.

The other thing is I don`t no if my 19T hybrid has a 15G or a 19T actuator.

[artfulflounder]

Think i read somewhere ur actuator is supposed to be half ur boost pressure.

Thats if ur running mbc/ebc.

[M-R-P]

Half boost pressure on standard turbo mate, then the map is designed to use the standard actuator accordingly.

[t5 pete]

Ive got a 1.2 bar acuator fitted to my 19t with billet wheel and that holds lovley or at least it did last time the engine was in the car I was going to get a forge one but they were out of stock so got a kingwa and its been fine

[artfulflounder]

Ive got a 1.2 bar fitted to my 19t with billet wheel and that holds lovley

Out of interest what boost is ur 19t running?

[960kg]

Sorry wrong forum!

[t5 pete]

Out of interest what boost is ur 19t running?

I was running 20 psi with the 19t

[Dangerous Dave]

The actuator on the small 13G on my AWD couldn't handle the increased pressure (possibly it was weak/broken anyway) so I put a 16t actuator on and it was fine. Different TD04HL turbos came with different actuators as in this link:

http://www.swededemon.com/turbo/turbolist.html

Though I haven't a clue what the different wastegate ratings are (i.e 300/70 or 275/60) or how they translate to what they'll hold

[oblark]

Out of interest what boost is ur 19t running?

There`s a guy in the Netherlands that running 1.7 bar (peeks) and drops to a steady 1.5 bar.

[t5 pete]

There`s a guy in the Netherlands that running 1.7 bar (peeks) and drops to a steady 1.5 bar.

Theres a bloke on t5d5 just posted up with a hybrid 19t or custom made on by a turbo manufacturer which was running at 1.6 bar which didnt last long due to over speeding it i.e pushing it too much and when broken down with what they can actually flow efficiently I reckon 20psi or 1.4 bar is enough for a 19t

[mike 850]

i have a 15g actuator on a 19t and it holds 21psi up top

[jdavis]

There's a video on YouTube posted by ipd that tells you the standard actuator pressures

[oblark]

M-R-P tested mine at the swedish day yesterday and it`s a good stiff 7 psi :)

And with a good spirited drive out of Salisbury yesterday it held a good 16-18 psi :)

[ROZER]

Half boost pressure on standard turbo mate, then the map is designed to use the standard actuator accordingly.
what have you set yours too dude being same engine as mine I set mine too 4.5psi .

[Volvostorm]

Mine isn't running a boost controller at the moment! :D

But, it does have a 1bar actuator ;)

Just thinking, now it is running a 4.4 ecu, should I be using the BCS or the later TCV?

[M-R-P]

what have you set yours too dude being same engine as mine I set mine too 4.5psi .
Just over 5psi mate.

Mine isn't running a boost controller at the moment! :D

But, it does have a 1bar actuator ;)

Just thinking, now it is running a 4.4 ecu, should I be using the BCS or the later TCV?
Bcs and tcv are different terms for the same thing. Just grab a t5 tcv from a P1 and you'll be fine.

[ROZER]

Just over 5psi mate.

Bcs and tcv are different terms for the same thing. Just grab a t5 tcv from a P1 and you'll be fine.

so you pump up your wastegate actuator to over 5 psi I cant do that with mine as it runs very funny indeed loads of power low down but lost in midrange mine is remapped but I have to set it to 4.4 stock or it runs like poo.

[ROZER]

would be good dude if you could do a little video on how to set your actuator on a p2 maybe am doing it wrong .

[M-R-P]

It's a bit difficult as I'd have to use several devices to do a how-to vid.

If you know for sure the actuator opens at 4.5 psi, give it one full turn inwards and that'll give you about 5-5.5psi.. If you're not 100% then I wouldn't risk it.

[ROZER]

when I do mine I pump the wastegate up to 4.5 psi then adjust the arm so it flops on easy I have a test rig to but I think am looking at it wrong it seems that you are looking at when it opens am I right.

[M-R-P]

Yeah, connect the test rig and the actuator should start to move at 5 psi.

[Dangerous Dave]

Mine isn't running a boost controller at the moment! :D

But, it does have a 1bar actuator ;)

Just thinking, now it is running a 4.4 ecu, should I be using the BCS or the later TCV?

TCV as that is what the duty cycle is set for. I found running the 850 BCS on my V70 caused some problems.

[Volvostorm]

Cheers mate

I will get one sorted, at the moment its directly fed from the compressor.

[Wobbly Dave]

On my GTX3071R I was running a 1 bar actuator but found it crept open a bit too soon even with a few twists of pre-load. I've now moved to 1.25 bar actuator and with the MBC wound right out it pushes 1.6 bar drops down a little in the middle of the rev range and then finishes toward 1.75 (25.3 psi). The sweet spot for the version of the GTX I have is about 1.8 bar which puts it bang in the middle of the optimum efficiency island 77%. Assuming I can get decent enough timing/fueling then I should be in for some decent umph. 25012

[960kg]

.......

[T5RatherAmusin]

for those wanting a wastgate tool...
get one of these and a 3mm T
http://www.ebay.co.uk/itm/Professional-Aneroid-Sphygmomanometer-Cuff-Blood-Pressure-Montior-Dial-Nylon-/400707306133?pt=UK_Health_HealthCare_RL&hash=item5d4c044295