Wastegate actuator swap for OM602.962? - Page 26 - PeachParts Mercedes-Benz Forum

JamesDean · #**376** 09-06-2012, 06:40 PM

Quote:

Originally Posted by shertex

According the Garrett distributor to whom I spoke, the 433489-12 actuator is no longer available.

The one that was originally used in the start of this thread.

Those lucky bastards. They'd better watch out. We'll be like thieves in the night. They'll go to start their 20 year+ old cars and all of a sudden be slower than molasses. It'll be the only recorded wastegate actuator theft in history.

shertex · #**377** 09-07-2012, 08:30 AM

A further detail: when a Garrett part is no longer available, it is extremely unlikely that it will ever become available again.

I have found someone at D&W Diesel (a Garrett distributor) who seems very eager to help us find an alternative part.

JamesDean · #**378** 09-07-2012, 08:33 AM

Quote:

Originally Posted by shertex

A further detail: when a Garrett part is no longer available, it is extremely unlikely that it will ever become available again.

I have found someone at D&W Diesel (a Garrett distributor) who seems very eager to help us find an alternative part.

I figured as much. Keep us apprised of the situation.

Did any of those other Garrett part numbers I posted work? The website I got the information from said they were still available. Ask the rep about them, the might not be an exact match but they might do.

432340-0015 12.7-14.0 M6x1.0
432340-0017 15.6-16.4 M6x1.0

shertex · #**379** 09-07-2012, 08:41 AM

Quote:

Originally Posted by JamesDean

I figured as much. Keep us apprised of the situation.

Did any of those other Garrett part numbers I posted work? The website I got the information from said they were still available. Ask the rep about them, the might not be an exact match but they might do.

432340-0015 12.7-14.0 M6x1.0
432340-0017 15.6-16.4 M6x1.0

I don't know....we probably need someone who really knows what he's doing to comment (not me).

Where I hope things go is that, when I get some alternatives from the Garrett rep, others who have done the mod and understand it well can evaluate the suitability.

So what are the pressure numbers? Pressure at which it starts to open and pressure at which it's fully open?

shertex · #**380** 09-07-2012, 09:36 AM

Okay....here's what this guy at D&W diesel came up with. He recommends as a substitute for the Garrett 433489-12 a Holset 3533948. Price is $71.40.

The bolt pattern is the same, the pressure rating is 20 psi vs. 17.9, and the rod is slightly longer.

Will this in fact work?

JamesDean · #**381** 09-07-2012, 09:47 AM

Quote:

Originally Posted by shertex

Okay....here's what this guy at D&W diesel came up with. He recommends as a substitute for the Garrett 433489-12 a Holset 3533948. Price is $71.40.

The bolt pattern is the same, the pressure rating is 20 psi vs. 17.9, and the rod is slightly longer.

Will this in fact work?

As I understand it there are two pressures related to actuators:
Cracking Pressure (aka Opening Pressure) - the pressure where the actuator starts to open at and Operating Pressure (not sure if thats officially what its called) but this is the pressure that is allowed to boost the engine--for lack of a better description).

The 433489-12 seems to have the following specifications (as I gather from this thread)
14 psi cracking pressure
17.9 psi operating pressure

The Holset 3533948 seems to have the following specifications:
?? psi cracking pressure
20 psi operating pressure

Can the rep send you datasheets or mechanical drawings and specs for the two actuators? I'd like to take a look at them.

-Kris

shertex · #**382** 09-07-2012, 10:25 AM

Basic question: how do we determine the correct pressure rating in the first place? Obviously can't come from the turbo specs since it would be a vacuum spec.

gsxr · #**383** 09-07-2012, 10:44 AM

Quote:

Originally Posted by shertex

Basic question: how do we determine the correct pressure rating in the first place? Obviously can't come from the turbo specs since it would be a vacuum spec.

There is a factory spec for boost pressure, which from memory is 0.85-0.95 bar (12-14psi). The computer controls the vacuum wastegate to keep boost in that range or lower. The appropriate pressure wastegate would do the same. The original ATP wastegate actuator that is currently out of stock works fine and boost pressure measures ~14psi at WOT.

JamesDean · #**384** 09-07-2012, 11:22 AM

I was doing some looking around and I came across a few things:

With enough doing, we probably could get a blow off valve to mount up to the EGR mounting point. It would just be expensive.

Those end adapters look a bit like the EGR.
http://www.boostcontroller.com/index.php?category=221

While on that site I came across TurboSmart and went to their website. They seem to have pretty good stuff.

This looks promising:
http://www.turbosmartusa.com/wp-content/uploads/2011/11/TS-06XX-XXXX-IWG75-Universal-rev-2.pdf

I found a straight-arm Mitsubishi Evo 10 actuator that looks like it might do well, after some arm length modifications:
Product | Iwg Mitsubishi Evo 10 | Turbosmart USA

I also found this document on changing springs to achieve the desired boost numbers.
http://www.turbosmartusa.com/wp-content/uploads/2012/06/IWG_springchart.pdf

Here is some instructions I found...
http://www.turbosmartusa.com/wp-content/uploads/2011/11/TS-06XX-XXXX-IWG75-Universal-rev-2.pdf

I think I'll send them an email with our requirements and see what they say. I believe their products are more expensive than the other replacements in this thread.

Email Sent:

Quote:

Hello,

I have a question regarding your universal wastegate actuators. I have a 1991 Mercedes-Benz 300D 2.5 Turbo. The Garrett turbocharger on this car is equipped with a vacuum controlled wastegate. I wish to convert this to a pressure controlled wastegate. I originally had a source for an actuator but they are no longer available.

I was looking at your IWG-75 series actuators. I was hoping if you could tell me if they would be a suitable replacement. I know that the rod length on the existing actuator is in the neighborhood of 108mm. It achieves a boost pressure of 14 or so psi at wide open throttle.

I was hoping to get your thoughts on this matter. I believe an IWG-75 equipped with a TS-0505-2003 middle spring and TS-0505-2006 outer spring would get me the 14 psi.

Thank You,

-Kris

sixto · #**385** 09-07-2012, 01:02 PM

You have to think outside the box but inside the PnP. Try the BOV from a 90-99 Eagle Talon/Mistubishi Eclipse/Plymouth Laser -

1G DSM BOV Blow Off Valve Eclipse Talon 4G63 Turbo 2G Pop Release PSI Honda | eBay . I forget at what pressure they open but they are modified to hold more by crushing - set it in a vice and collapse the housing to put more preload on the spring. Meaning, you want an uncrushed BOV. There is something more desirable about the 1G (90-95) BOV but that might be relevant only to the original application.

There are attractively priced new alternatives -

CARBON FIBER TURBO TYPE S BOV BLOW OFF VALVE ECLIPSE 3000GT LANCER R | eBay

But why use a wastegate or BOV at all? mech wastegate step x step with pics - Diesel Place : Chevrolet and GMC Diesel Truck Forums

Sixto
87 300D

JamesDean · #**386** 09-07-2012, 03:32 PM

Well so much for TurboSmart

Quote:

We don't have anything available for you at this point. We do have lots of things in development, so I'd recommend checking back at a later point.

Sorry!

Seems to contradict "universal." I thought I understood their product and that it would work, their reply is not very detailed. It their product was cheaper I would buy and try but not at that price.

Diesel Wannabe · #**387** 09-19-2012, 09:37 AM

I'm new to MB diesels and loved this thread, thought it would be my first project for my 92 300D. Now I guess I am in waiting mode for an alternative to the now discontinued actuator. Any other solutions that I missed?

JamesDean · #**388** 09-19-2012, 10:43 AM

My ebay alternative unit arrived last week. I've not had a change to install it or anything.

I plan on working on the transmission this weekend and trying to get all that fixed again... After that I'll try the turbo and see.

I originally wanted to build a test bed of sorts to see how exactly this thing operated..

shertex · #**389** 09-19-2012, 10:56 AM

Quote:

Originally Posted by JamesDean

My ebay alternative unit arrived last week. I've not had a change to install it or anything.

I plan on working on the transmission this weekend and trying to get all that fixed again... After that I'll try the turbo and see.

I originally wanted to build a test bed of sorts to see how exactly this thing operated..

Kris, what was the exact part you got? We'll all be interested to see how it works.