Hello,

My Turbo only develops about 7 to 8 psi does anybody know if thats enough to compress the ALDA.

I have no power on hills.

The Mercedes specs I believe are 10 to 12

thanks

Brian

PS: see my other thread at...................

http://www.peachparts.com/shopforum/showthread.php?t=156650

7-8psi is what most 300SD's and 300D's run at from the factory. Look elswhere on your SD for your problem, it looks like the turbo is not it.

no power is the very first sign of a need to
change filters, also clean the tank.
Clean the banjo bolt on the back of the engine.

Hello,

Thanks for the replies.

I have checked my 1982 300sd/w126 and it runs fine. The PSI from the Turbo to the ALDA rises all the way up to 15 PSI. While my 300sd/w116 stays at 7 PSI.

Is it true that all the Garrett Turbo's whisle. I have one that does and one that doesn't. The one that doesn't has the power problem.

Any suggestions would be appreciated.

Brian

Hello again,

I found this on the web........Richard Sexton

The turbo itelf creates in excess of 2 bar (30 psi); to limit this to the 1 bar the car needs, a wastegate vents excess pressure to the atmoshphere. Factory spec is 0.9 to 1.0 bar, (about 15 psi) but they never came that way from the factory, most are in the 0.5 - 0.6 (about 7 psi) bar range. Calibrating this to factory spec makes a phenominal diference in performance.

Brian

The ALDA only requires a little boost to move it. I don't know what PSI will max out its travel though.

Have you adjusted you wastegate to try and raise the boost? If you can't get it to go any higher you might have a cracked wastegate valve seat or need a new wastegate spring.

http://diymbrepair.com/easley/wgate.htm
http://www.peachparts.com/shopforum/showthread.php?t=114337

My garrett doesn't whistle and it makes about 10 psi of boost. I do need to replace the wastegate spring though. I want to run 14 PSI of boost although spec is 10 to 12 PSI.

__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png

Hello,

Connclark, thanks for the post and the additional info on the Turbo.

I'm at a loss right now on what is the next thing to check.

The car takes off quick from start [1st gear] and then bogs down in 2nd. It seems as if not getting enough gas[diesel]. It will only change up when I lift my foot a tad.
Normal take off [ light on the pedal ] accelerates nicely. Its only when you floor it.

Any suggestions.

Could it be the valves?

Please advise

brian

ambient temperature/location please?

__________________
1984 300D Turbo - 231k....totalled 11/30/07 RIP

Factory boost spec is .7-.8 bar (10.15-11.6psi) as shown in the OM617 FSM.

Your not gonna get a lot of boost without fuel. I would check the line from the intake to the alda for restrictions. Also adjust the alda if it hasnt been done before.

Hello,

Omegaman, thanks for your input.

However, that's been checked and double checked.
I get 7~8 PSI at the ALDA.

There has to be something else involved here. As anybody else had a similar problem.

I have replaced the ALDA from one I bought off eBay.

Adjusted the ALDA up and down and it doesnt make a lot of difference unless I back it right down.

please advise

anybody

Brian

I'd bet your tank screen has sludge all over it.

In post #3 you were advised to change fuel filters, check the tank screen, and check and clean the pressurized line from the banjo bolt to the overboost valve and then from that valve to the ALDA.

Did you do any of these things?

You were given solid advice and yet you continue to ask the same questions.

Finding your problem is a step by step endeavor. The turbo is near the very end of the process.

Hello,

Brian, those were done and its still the same complaint.

Brian

maybe you could try temporarily bypassing the overboost protection valve.

__________________
1984 300D Turbo - 231k....totalled 11/30/07 RIP