Trout...

Shortening the rod will change the crack pressure of the wastegate - basically the wastegate will remain closed up to a predefined limit - say .6bar - and then be controlled by the boost control system. So if you disconnected it you would always make 0.6bar.

However - shortening the actuator has its limitations as the spring will not be strong enough. I had a 0.8bar actuator - shortened to crack at 1.0bar - however the spring just was not strong enough to control the overall boost profile I wanted to run.

I now have a 1.2bar actuator from Bushey Tuning - which has a very strong spring. Top end boost control is now far superior. Also the boost will hold up much better at higher revs.

So - shortening the acutuator will enable the boost control be better - up to a point - and will enable boost targets to be better held.

Trout

PS To test the crack pressure - fit a pipe to a small pump - you will also need a good boost/pressure guage. Pump it up and you will see at what pressure the acuator opens the wastegate. Remove circlip and shorten - you will then see what pressure you need to get the rod to reach the pivot on the wastegate - this will be your new crack pressure

PPS I am sure this will invalidate your warranty and many rods are 'painted/sealed' to see if they have been adjusted.

[Edited by Trout - 8/5/2002 2:07:43 PM]

Trout...

Stephen,

once above crack pressure the boost control system - solenoid, EBC/ECU will control the amount of wastegate opening to achieve the target boost. This will give a wastegate duty cycle value.

In reality of the actuator spring is strong enough to control the boost being loaded - shortening the rod will only give real value if the WG Duty Cycle was already approaching 100% at peak boost.

Trout

[Edited by Trout - 8/6/2002 7:08:36 AM]

Trout...

Steven,

well at the last count I had 346 horses - do think that would be too many for a ten acre field and three loose boxes

Trout

PS Can I take from the pics that your car is metallic purple?

[Edited by Trout - 8/7/2002 9:37:04 AM]

P20SPD

iTrader: (1)

Shortened the rod and it seems to work.

Pictures a stages i carried out. Hope this is of some use to others.











Hope the instructions are right. Pick faults if i have done it wrong! But it seems to have helped it reach top boost quicker once past half boost.

David_Wallis

Told you to do it.. so has it increased the target boost??

David

P20SPD

iTrader: (1)

Yeah its probably increase it by .05 or .1 bar in 4th and 5th. Biggest diff to me seems to be once it gets past half boost, about 0.6 bar, it just seems to hold and pickup boost smoothly.

Still hasnt cured the responsiveness below half boost.

Full boost is coming on at about 2700-2800rpm.

I have been running super or optimax now for the last 3 tanks!

Once again David thankyou for telling me to use these.

See ya tomorrow, the weather is gorgeous here at the mo.

Stuart Taylor

I have a couple of questions
Do you need to do any other mods before adjusting the actuator?
Also how much did you screw the rod in by?
Does it make a big difference?

Thanks Stuart

P20SPD

iTrader: (1)

Sorry for delay

My mods are
Scoobysport downpipe
Magnex centre
Scoobysport back box
Blitz induction kit
Tek 2 ecu.

The only reason i did the actuator was that the car did not seem to be holding full boost quite so well. It also seemed sluggish from half boost(0.6bar) to full boost(1.15bar).

i was told that the wastgate on the turbo can open at about 8psi which i think is my half boost. By shortening the actuator rod to the wastegate it makes it harder for the wastegate to open, therefore it holds and gains boost better.

I only shortened it half a turn.

Hope this helps

Dr Hu

NOTE:- Most people with std downpipes will have to remove the heatshield from the turbo to expose the actuator, which is a bit of a bstard!

So after tightening 1/2 turn do you have a higher HELD boost now?

How did you stop yourself turnning it a bit more.....and a bit more....

ScoobyJawa

Stephen Cole

Just out of interest, I've been trying to measure the travel on my actuator, while planning possible 'adjustments..'
After a lot of complex messing around (as I still have the heat shield on) I have discovered that the actuator only seems to have a relatively small travel eg about 3mm
I was expecting about twice that

Stephen
MY94 WRX 5-door
TD04 turbo
11 psi boost (std)
or rather brief 13psi peak and 11psi sustained
(I would like 13psi sustained ...)

wastegate is suposed to open or be fully open? when it sees 7 psi
(and the boost solenoid bleeds off boost so that wastegate diaphram effective pressure is less than the manifold boost pressure)
Not sure what happens between 0 and 7psi wastegate diaphram pressure, and whether the wastegate starts to slowly open, or if
it only 'suddnly' opens, to its full travel?, at 7psi
The posts above implie a crack pressure (fair enough) but how much additional pressure, if any, above that do you need to fully open it ?

scoobyboy

also remember though that when the boost pushes on the spring it is also pushing the diaphram against atmospheric pressure as well hence the hole on the underside of the actuator so the pressure it opens at also depends on the type of day outside i.e hot or cold and damp.

David_Wallis

LMAO at Bushey Tuning.

David

Trout...

David,

I hope that Mark understands that you are laughing with him - not at him!

Trout

R19KET

Trout,

David can laugh with me, or at me, it doesn't matter......he's from Leeds, so it doesn't count

By the way, my boost was down by about 20% on Sunday, would the actuator mod work for me ? I can't seem to find it though

Mark.

Trout...

Mark,

I'll pop over later to see if I can help you find it - I don't know these amateur modders who don't know their **** from their elbow - fancy not being able to find your acuator rod on your wastegate

Trout

P20SPD

iTrader: (1)

Thanks for the replies guys. Trout thanks for the detailed info, there was no paint on the rod, i checked this 1st. By the way i now know who you are, we did talk on sunday but like a tit i did not introduce myself. We talked around marks car(didnt everyone) similar build to d wallis but shorter and had glasses(not sun) similar hairline to yourself

Dr Hu it does hold boost better. Heatshiled is atwat with standard dp but what you got one of those for

Ps trout email me with where your moving to if you dont mind doing so, as it sounds like you moving very close to me. Do you want any horses for the stables as the missus has 6 and i am trying to get rid of some

David_Wallis

Pah Mark... Amateur... I told you im not selling you the nitrous, no matter how much you ask... ive got that video of the fiesta beating you here

LMAO @ Actuator rod.

Im going to make some air injectors to control my boost... get some cosworth greys and a plug in compressor, similar to the one tim and plantie had on sunday... Oh and some tin foil and duct tape... thats how its done up north... Besides when trout moves up here.. he will start bodging his car with duct tape as well!

David

Trout...

P20SPD,

If you need grazing I also will have a 10 acre paddock

Rental will be very cheap!!


Completely PML@David Wallis - I already bodge things up with Duct Tape!

Trout

Adam M

I have looked long and hard in my engine bay to find this actuator thing, trouble is it doesnt seem to be there.

I would ask where it is in relation to the engine and turbo, but since the engien is in garage in bushey and the turbo in a hanger up north somewhere, I dont think its going to help.

Adam M

Oh and david,

since you are moving up north, does this mean we will be seeing you even less?

three times a year or so was already a little too much for me, so this could be a good move for everyone.

P20SPD

iTrader: (1)

trout cheers for the offer but i have 15acres available myself

cheers

Steven

Trout...

Steven,

so instead just having pissing contests about bhp - we can now have pissing contests about acreage - LOL -

Trout

PS I will be near Stamford Bridge - email me at rannoch1@hotmail.com and I will give you more details.

P20SPD

iTrader: (1)

no intention of a pi55ing contest, just want less horses, ie more money for scoob

P20SPD

iTrader: (1)

Trout YHM

Trout...

Steven,

hope you realise my tongue was firmly in my cheek

Mind you I am always after more horses - not sure why you want less

You have mail too.

Trout

P20SPD

iTrader: (1)

Yes i do realise tongue in cheek Horses cost more money than Scoobs. She has 6 Horses i only have one scoob.

this is not fair

P20SPD

iTrader: (1)

Trout LMFAO at Problably explains why my scooby is so slow what with only having 6 horses

No its Mica Red Why is it the engine bays do not come anywhere near representing the colour of the car??

P20SPD

iTrader: (1)

Right i have given it nearly a week now since i did this and have run on super or optimax. Conclusion, the tek2 now works properly again.

Just wait the goodies i have order now. Will i need to remap with uprated fuel pump and aps dump valve or can i wait to remap untill i have the APS induction kit and APS FMIC and if i play my cards right a new turbo

(What did i say the other day "no must not spend money on car". oh Well)

David_Wallis

why you getting an aps induction kit?? Just the pipe under the inlet I hope??

David