9 psi max boost - Page 6 - PeachParts Mercedes-Benz Forum

panZZer · #76 11-25-2012, 04:25 PM

Quote:

Originally Posted by funola

I have the Garrett. I found a few good DIYs. I couldn't get the flat spring retainer tang on the wastegate cover to lift. The tang is right under the inlet housing which is in the way of visibility so I was working by feel. Garrett could have installed the tang in a more accesible/ visible spot to make it easier. Looks like they did that on purpose and don't want you to fu*k with it. I used a small flat blade screwdriver but it kept slipping off the tang. Very frustratiing. I will make a special tool with a sharp chisel point to get under the tang in order to lift and hook it and see it that works.

mmmK, so

Has anyone taken the stock wastegate off the garrett and stuck on the adjustable one from the KKK on their w123?
the garrett has a plate on the opposite side from the stock WG and it should be easy to install the kkk one there, and thread the hole of the stock one and put a pipe plug in.

Simpler=Better · #77 11-26-2012, 10:21 AM

Quote:

Originally Posted by panZZer

mmmK, so

Has anyone taken the stock wastegate off the garrett and stuck on the adjustable one from the KKK on their w123?
the garrett has a plate on the opposite side from the stock WG and it should be easy to install the kkk one there, and thread the hole of the stock one and put a pipe plug in.

The hardest part of adjusting the garret WG is removing the back plate without messing up the studs. Once you have it apart an adjustment is easy.

Silber Adler · #78 12-01-2012, 08:54 PM

I took the easy way and made a manual boost controller. Never needed to dig into the waste gate controller.

Studepickups · #79 03-06-2013, 09:19 PM

Hi guys! I read with interest your comments on boost pressure. I drive a 84 300SD though it stays in the garage mostly. Recently I converted a 1960 studebaker 3/4 ton pickup by installing an engine from an 85 300 SD. It performs quite well but would like to find a speedo drive gear that would slow the speedometer down about 5MPH. The trans is from a 300D with a standard cable.
The interest in boost pressure comes from the new turbo recently installed in the pickup. 1.1 bar translates to 15.95 PSI boost. I have connected the ALDA direct to the manifold and eliminated the overide circut. That means I am depending on the waste gate to control the boost. How much greater than 16 is safe. My waste gate is adjustable and I have a 3" straight exhaust. Connecting a boost gage is easy but where would one best connect the EGT gage for the correct reading while doing trial and error with the waste gate. I have alwo removed the EGR.

Simpler=Better · #80 03-07-2013, 09:07 AM

I like it!

16psi is too much. If you haven't been in the pump to mess with anything, 12psi is all you need. For the EGT gauge you want to tap into the manifold, pre turbo, directly in front of the turbo inlet. You will have to pull the turbo to do this-the up side is that with the turbo off it will be very easy to adjust the wastegate.

5mph isn't terribly far off, but I'm sure some other people can chime in with the correct year speedo to grab for a conversion

zerocool68 · #81 03-19-2013, 12:14 PM

Does anyone know how stiff the spring is on a Garrett T3 turbo waste gate actuator? Most says that the boost to open the waste gate should be around 10 psi, but if I stick a compressed air into the actuator port, the waste gate does not pop open till about 60 psi on the compressor gauge. Please advise if I'm doing it wrong. The engine is a OM617 on a 84 300sd. Thanks. ( If there is a thread for this can someone redirect me to it)

Silber Adler · #82 03-19-2013, 02:35 PM

You are right the waste gate should start opening at 9-11 psi.

Do you have a boost gauge on your car to verify what you are getting over the road?

Do you have an air leak in your test setup. Perhaps the diaphragm is leaking.

Quote:

Originally Posted by zerocool68

Does anyone know how stiff the spring is on a Garrett T3 turbo waste gate actuator? Most says that the boost to open the waste gate should be around 10 psi, but if I stick a compressed air into the actuator port, the waste gate does not pop open till about 60 psi on the compressor gauge. Please advise if I'm doing it wrong. The engine is a OM617 on a 84 300sd. Thanks. ( If there is a thread for this can someone redirect me to it)

TrapOxidizer · #83 05-15-2013, 02:19 PM

Quote:

Originally Posted by Studepickups

How much greater than 16 is safe. My waste gate is adjustable and I have a 3" straight exhaust.

16psi is already WAY too much. 12psi is all your engine can use, anything more is just heating the intake air.

funola · #84 05-15-2013, 02:30 PM

Quote:

Originally Posted by TrapOxidizer

16psi is already WAY too much. 12psi is all your engine can use, anything more is just heating the intake air.

unless an intercooler is added.

oldsinner111 · #85 08-25-2013, 08:03 AM

I run or try to shift at 16,but I have been as high as 26 psi with no lack of fuel.only mods were ALDA delete, and strait exhaust

cho · #86 12-20-2013, 07:07 AM

Quote:

Originally Posted by oldsinner111

I run or try to shift at 16,but I have been as high as 26 psi with no lack of fuel.only mods were ALDA delete, and strait exhaust

/

just curious....what was the temp while 26psi?

.

oldsinner111 · #87 12-20-2013, 07:31 AM

temp is 80,I have a 170f thermstat in my diesel also.I know it should be not possible,but maybe someone messed with the car before I got it.

cho · #88 12-20-2013, 07:41 AM

.

thanks mate,... but not the coolant temp....exhaust temp...

I think you are close to total meltdown

just joking but I suppose that
you are way over regular temps....

.

oldsinner111 · #89 12-20-2013, 11:05 AM

don't know,I don't stay there long,and beside now 16 is all I go and for a short time.

vwnate1 · #90 09-10-2018, 01:39 AM

9.9.2018 I just discovered this great thread, THANK YOU ALL for the detailed inputs and ideas .

I discovered a you tube video from that place in Bellingham, Washington (Kent) that shows him removing the wastgate cover spring with a crappo Harbor Freight pick tool .

My wastegate diaphragm is toast, it leaks pressure/vacuum so it was disconnected and plugged when I bought the car, now I know I need to find another diaphragm before I open it up, hopefully on the car .

I see Funola is still driving and enjoying his car, that's good to know ,I've only had this car 6 ~ 9 years and am still discovering bugs and DPO / DPM bodges here and there .