Wastegate Actuator Mod

[EnricoPalazzo]

I think the adjustable part is in the rod, which is what i first posted in this thread. So basically it has the stronger spring inside the W. A, and the adjusting mechanism on the rod?

Anyway its about 100 more then the HKS one.

[Guest Robo's]

But why adjust the rod for boost control when its easier to adjust the boost controller with the screwdriver??

[Warpspeed]

It may be adjustable, but it most probably is not going to be as adjustable as you think. Remember, it still has the same spring in there.

A typical standard actuator might require 10mm of travel, and it may open at say 9psi and be fully open at 11 psi (for example).

Now if you compress the spring an extra 10mm by tweaking the control rod, it might then start to open at 11psi, and be fully open at 13psi.

But if you try to go higher you might find that the coils in that spring just go solid. It is not a very long spring you are playing around with. When the supplier sells you an adjustable wastegate actuator, it probably means you can adjust it exactly to the rated pressure, perhaps +/- 20% or something like that (guess ?)

You are not going to be able to set the boost anywhere from 5psi to 25psi, no way. You are going to have to use an air bleed system, or a proper boost controller to do that with a five pound actuator, or whatever.

I think the best feature of an external wastegate is you can easily change the spring, and/or fit an external pressure regulator that will give you fully adjustable boost. Every external gate I have ever seen comes with a pressure port on both sides of the diaphragm. The manufacturer also will have a wide range of springs available. You cannot do the same with the cheapie on turbo actuator, because the control rod end is open to atmosphere.

[Jay95R33]

Anyway its about 100 more then the HKS one.

So the HKS ones are around $147 ??

But why adjust the rod for boost control when its easier to adjust the boost controller with the screwdriver??

Cause this 'may' get rid of the boost dropping off at the top end ??

It may be adjustable, but it most probably is not going to be as adjustable as you think. Remember, it still has the same spring in there.

Yepp, wouldn't give you as much adjustment as a bleeder, but if you only want 12 or 13psi it may give you a better result than buying a EBC a setting it at one setting and leaving it.

Just a thought..

J

[Guest Robo's]

Ok, im in!!!!!!!!!!!!

[Guest Robo's]

Greenline seem to be around 22,000, which to me is around $250?? Is this right, it doesnt say much about the Actuator with spring strength etc. Possibly the CGC one sounds good.

[Gizmo73]

jsut gotta say - this is a great topic...

I have learnt much regarding turbos regarding this discussion..

And SO - it seems we are back to HKS spring rated actuators....

[Zombie]

I have an adjustable aftermarket acuator (garret i think) that I had adapted for my car. It is currently set at 15psi and holds it perfectly, no need for any EBC or bleed valves. I got it for a mates rate $200 exchange.

I think it holds 15psi to redline, I will check on the way home tonight

Adam

[Jay95R33]

I'd like to wait a bit and see if anyone (SydneyKid in particular ) has had any experience with the GCG ones.

At the moment I can only go from what GCG have told me, which does sound good.

The last thing I want to do is arrange a group buy, then later find out there is a better option.

Zombie - I'm keen to see how yours goes (holds boost), and if you can find the make of it it'd be great

J

[JAS-25T]

guys the thing is

the adjustable part is the actual preload your putting on the wastegate not the actual spring rate, just bear this in mind

[EnricoPalazzo]

The HKS upgrade wastgate actuator, which will fit on our cars is approximatly 11,384 Yen, which equates to 135.762 AUD

Plus say 20-30 for postage. Adds up to under 160. Thats what im getting.

We could get a small group buy happening, it would only alter the price a little however savings would be in the shipping.

[EnricoPalazzo]

http://www.greenline.jp/catalogue/bcpartli...=R33B&intake=FI

[Jay95R33]

I'm just having a read on http://www.takakaira.com/performance/main.html about the HKS upgrade actuator.

it says 'boost pressure can be altered by expanding or retracting the actuator rod'

It doesn't say anything about an upgraded spring, BUT being HKS I wouldn't doubt if it has an upgraded spring. They show dyno graphs etc as well.

If the HKS one holds boost (upgraded spring) I think they would be the way to go....

J

[Jay95R33]

I think it does have upgradable springs. On the HKS Japan site it's quoting boost pressures with different part numbers...

Have to look further into it.

J

[EnricoPalazzo]

I think when you order the part, u tell them what psi u want to hold. they sell the actuator that holds the desired boost level. Im not sure about them being interchangeable, but i know that BOOSTED on these forums upgraded his actuator to the HKS one and he can hold in the vicinity of 18-20psi, obvioulsy the turbo has been modded, but still retains r33 turbine

[benm]

Interesting topic..

At the drags both last night and the week before it felt like my top end (5,800->6800rpm) was 'lacking', almost like the turbo was running out of puff. I got 2rismo to drive it and he straight away thought it was my standard wastegate not holding pressure. I thought i'd just be able to swap over to a high pressure spring but as mentioned above this doesn't appear to be the case.

Does anyone know what the standard wastegate can hold? Can these things 'wear out' over time? (my car is a '95). I'm only running standard ECU so I was thinking it was just in dire need of a thorough tune but after reading this thread and letting 2rismo drive my car (he did a 14.1 and a 14.2 which is equal to my PB) its got me thinking...

I've always been told by Dyno Operators that my car holds boost perfectly but the last time I was on a dyno was 6mths ago so maybe that has changed. I'm using a TurboXS Dual-Stage boost controller with a switch in the center console set to 7/12psi. I use 7psi for daily driving but want to use 12psi at the drags.

n00b.

[Steve]

Benm, try a reset on your computer. I used to have this same problem all the time. Driving to and from work in traffic, and every couple of weeks the top end would start to die - resetting the ecu and taking it out for a good thrash did the trick every time.

[benm]

Nothing like starting with the obvious first I've been meaning to reset my ECU after replacing the HKS Pod with the Stock Airbox + K&N Panel filter too because its been idling rough so hopefully a reset will fix both issues.

Thanks Steve.

[Munna]

Hey guys im having the same problem. Im using a turboxs bleeder set to 10psi

as soon as I hit 5000rpm boost slowly drops back to 7 psi by 7000rpm. Standard turbo and standard IC.

[EnricoPalazzo]

well more so then any of us, the reason u are having that problem is because of that standard cooler. Change it and u should be able to hold 11-12psi to redline.