Advice / Help - Uprated Waste gate actuator

[gogsie]

Looking for uprated wastegate actuator for my 04 JDM STi.

Anyone purchased / fitted one - advice / help greatly appreciated.

Do you get adjustable ones

[jcscoob]

Why do you need one of them ? [^o)]

Sorry know nothing about them.

[gogsie]

Doing a bit of modding JC and hoping to get about  350-360 Bhp and about 340lbs/ft torque. When using boost controller for that bit extra boost when required AFAIK the waste gate actuator can creep a little at higher boost levels so want to change it to make sure Andy can get the best results when I get my remap on 06/09.

Have you read the Newage mod write up on Scooby net? Learning quite a bit from it but wish they would hurry up with stage 2. Spending cash now but no doubt stage 2 will reveal a better way of doing it. Ah well all part of the fun!

[jcscoob]

Hmm, i see[y] more boost captain []

[dipsy]

Gogise try Graham Goode Racing they were in Japanese performance magazine last year there was a write up about them modiyfing a jdm sti9 and they changed the waste gate actuator because it was not holding boost if thats any help ie 1.6bar

[Power Junkie]

If Andy is going to map, It will be a good idea to get his advice on it []

[gogsie]

Hmm, i see[y] more boost captain []

This explains it better than I could

Wastegate Actuator

The wastegate actuator controls the opening and closing (to a degree) of the wastgate, which in turn dictates how much boost the turbo will try and make (boost dependant on turbo specification).

An actuator works by pressure generated by the engine, pushing the actuator rod out (when exceeding specific pressure) closing the wastegate and retracting (after forward movement) when pressure is dropped, opening the wastegate.

An actuator is normally rated with a "crack" pressure, which dictates what pressure is required to move the actuator rod out to close the wastegate and reduce boost. The higher the "crack" pressure, the more boost the turbo will create while the actuator is in rest.

Pressure to the actuator is normally fed via a boost control valve (explained later). This pressure can then be "bleed off" via the boost control valve, to create a scenario where in fact the actuator will let the turbo produce more boost than the "crack" pressure dictates. While this is a way to produce more boost, to actually hold boost pressure for a specific period of time it may be required to use a actuator with a higher "crack" pressure in any case to sustain this. This normally requires an actuator with a harder spring.

Since we wanted to experiment with holding a higher defined boost target, we decided to upgrade the standard actuator with one that had a stiffer spring (higher "crack" pressure) and adjustable rod for changing pre-load on the wastegate.

Old Actuator (small elbow at front takes vacuum pipe & the brown rod at the back is the actuator rod)

New Actuator (small pipe at front takes vacuum pipe and the silver/gold rod at the back is the adjustable actuator rod)

[gogsie]

If Andy is going to map, It will be a good idea to get his advice on it []

Yeah your right Power Junkie - I sent him an e-mail earlier but he's a busy man so don't know when I will get a reply and need to get one ordered and fitted before I see him on 06/09.

[gogsie]

Looking for uprated wastegate actuator for my 04 JDM STi.

Anyone purchased / fitted one - advice / help greatly appreciated.

Do you get adjustable ones

Just read the write up again and noticed it mentions you get adjustable ones DOH! 

[dipsy]

Send a pm to the webmaster on sn it his car he maybe tell you the part number of the uprated actuater

[gogsie]

Send a pm to the webmaster on sn it his car he maybe tell you the part number of the uprated actuater

 

Cheers

Dipsy

[fai17]

Ask Andyjdmsti as he has his JDM win scroll turbo fettled[]

[ANDYJDMSTI]

Ask Andyjdmsti as he has his JDM win scroll turbo fettled[]

that i have  []

had my turbo sent away to be played with and it returned with a new actuator on it along with blades cut back or something like that and a vf22 housing instead of the vf37.

in my initial map all i did was get a decat, uprated panel filter and i saw 345bhp with 344 lb/ft, with no boost creep problems. Max boost was around 1.6 bar tailing off and holding around 1.45.

 

[]

[dipsy]

Andy is 345bhp and 344lb/ft on standard vf37?? .I would defo say it is

[ANDYJDMSTI]

Andy is 345bhp and 344lb/ft on standard vf37??

 

yes mate that was when it was just a standard vf37 twin scroll.  It should be good for about 380 max if you want to have it sitting on that knifedge []

[gogsie]

So is the JDM twin scroll turbo a VF37? Graham good has an uprated actuator but it says upto 1.4 bar

[dipsy]

Jdm sti is a vf37 turbo 03 onwards.The spec c and c ra rollerbearing vf36 twin scroll

[ANDYJDMSTI]

So is the JDM twin scroll turbo a VF37? Graham good has an uprated actuator but it says upto 1.4 bar

why spend the money on something that is not broken??..............get it mapped and take it from there. If there are any boost issues then andy is the man to tell you there and then the best way forward.  []

[WUZ]

Have you decided on whether or not your going to use the NEW AVCR I got you? If not, I'll need it back in UNUSED CONDITION. Cheers!

Russell

[drb5]

Am i getting this right, Gogsie?

Your wanting to uprate the actuator, when you don't even know if you NEED to?

I reckon you should drop Andy a wee PM/email to ask for his idea's, but i wouldn't have thought he'd agree with another actuator.

If you do have an AVCR, which i see Wuz has pointed out, use that and forget about it till the mapping day comes(or sooner if you ask Andy), then take it from there. I've heard bad stories about uprated actuators, but i won't elaborate as it's not be hard evidence.

Another thing. If your worried about the main problem with the actuator(boost creep), then the uprated actuator wouldn't combat that really. Porting the exhaust housing of the turbo would. Just wasn't sure of your main reasons for upgrading it?

[gogsie]

Am i getting this right, Gogsie?

Your wanting to uprate the actuator, when you don't even know if you NEED to?

I reckon you should drop Andy a wee PM/email to ask for his idea's, but i wouldn't have thought he'd agree with another actuator.

If you do have an AVCR, which i see Wuz has pointed out, use that and forget about it till the mapping day comes(or sooner if you ask Andy), then take it from there. I've heard bad stories about uprated actuators, but i won't elaborate as it's not be hard evidence.

Another thing. If your worried about the main problem with the actuator(boost creep), then the uprated actuator wouldn't combat that really. Porting the exhaust housing of the turbo would. Just wasn't sure of your main reasons for upgrading it?

Yeah first thing I did - then posted this thread to get some opinions. Andy's a busy man so awaiting his reply.

I think boost creep was the wrong description, Yeah I don't really know if I need it but as per Powerstations work on SN webmasters car they felt it was a good idea for the following reason "to actually hold boost pressure for a specific period of time it may be required to use a actuator with a higher "crack" pressure in any case to sustain this. This normally requires an actuator with a harder spring."

It does say "may need" but to save Andy's and my time I'm thinking it would be good to cover everything now.

[drb5]

I know exactly how you feel, but it's almost gauranteed there will be something else you should have done instead. [] I had the same problem myself, with wanting everything done...making sure i had nothing to worry about, but it just didn't happen. There was always something that could have been tweaked.

All i'm meaning is wait and see. You never know, it might be perfectly fine. There's plenty of people with no problems at all.

[gogsie]

Got e-mail from Andy today and he reckons the standard actuator is well up to the job so that'a good enough for me. Happy as that saves me £120 [] and allows me to spend it on something else [Y]

[ANDYJDMSTI]

Got e-mail from Andy today and he reckons the standard actuator is well up to the job so that'a good enough for me. Happy as that saves me £120 [] and allows me to spend it on something else [Y]

 

Happy days.....knew andy would say something to that effect  []

[craig mac]

Got e-mail from Andy today and he reckons the standard actuator is well up to the job so that'a good enough for me. Happy as that saves me £120 [] and allows me to spend it on something else [Y]

A nice pressie for the wife Gogs[]

Craig