I turned up my boost some more today. Unfortunatly I haven't got my boost gauge installed yet so I don't know how much. After aging for 20 years my setting is probably close to factory spec now.

It makes a difference too. Especially durring shifts, I can almost make the tires chirp. I even suprised a ricer. You would hardly know that this car has all its emissions equipment intact and functioning properely .

Now if I can only get my boost to come up sooner.....

__________________
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

also install a pyrometer... i plan to.. and im glad i have a KKK

how do you know what type of turbo you have on the car? I have an '80 300SD

how do you turn up the boost? i have a 82 300cd

this is how i noticed i had a triple K ... look on the compressor housing.. see a triangle with three k's... if so its a triple k.. and if it has an model airplane engine looking thing sticking on the turbine housing its a tripple K.. thats all i know about knowing if its a triple K

To TheDon. Model airplane looking thing.
Are you talking about the part right before the exhaust
pipe that looks like a model airplane engine cylinder, but larger ?

I too would like to know which turbo I have in my car.


And - I want to know how to turn up boost.

I have searched and read the many, many threads on boost,
including a lot of talk about expected boost numbers.

I still am not clear on how to boost turbo, but I do believe that I must
turn up ALDA in 1/4 turn counterclockwise increments as I increase boost.

Other than that ALDA adjustment thing , I can't seem to understand
the threads about boost adjustment.

I just looked at my wastegate and do not see a way to adjust it
for higher boost pressures.

Under load I am getting 9 PSI before and after the aneroid over boost
protection valve. Maybe a hair over, but no more than 10 PSI.

1983 300SD 617.95x engine.

__________________
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250

http://www.schumanautomotive.com/forums/showthread.php?t=633

A good diagram

i agree and a great forum

Adjustment of the boost pressure can be achieved through and adjustment of the wastegate spring or, more easily, through a boost controller. It is imperative that you install a boost gauge before making any adjustments to the boost pressure. Also, when you increase boost you must make adjustments to the fuel delivery (ALDA).
Look in the DIY tabs above for a boost controller install.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

\
I disagree, the purpose of the ALDA adjustment is to regulate pre-boost max fuel. Before boost pressure builds there is a full load fuel stop (ALDA). When boost pressure builds, this fuel stop moves allowing more fuel in as the diaphram moves down?? I can't remember the exact movement off the top of my head, but the point is, all the ALDA adjustment is going to do is allow more fuel in pre-boost. After boost builds there will be no difference because the fuelling has already exceeded any limits set by the ALDA.
Hope this makes sense.
BB
Ps what you really need to adjust is full load stop per Brandon's procedure

__________________
For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel

The ALDA provides more fuel throughout the operating range of the engine with the exception of full load fuel. Effectively, it shifts the fuel curve to the right so that you get more fuel at lower rpm's.......before boost.......and more fuel at higher rpm's after the boost comes on.

When you adjust the ALDA, all you are doing is shifting the fuel curve to provide more or less fuel depending on which way you turn it. This adjustment is independent of the ALDA's primary function of advancing the rack when it sees manifold pressure.


Increasing boost does not require an adjustment to the ALDA. If the ALDA is working properly, it will see the increased boost and open the rack a proportionate amount. However, if you increase the boost too far.......outside of the range of the ALDA........you don't get anything but more hot air. The general consensus is that the limit is somewhere around 13.5 psi or so. I'd love to take one apart and see when the control rod stops moving after gradually applying increasing pressure.

Naturally, if the engine is running with less than the desired fuel, an ALDA adjustment may be beneficial. But, it's not necessarily required simply because boost was increased.

From the diagram from boneheaddoctor i have a garrett T3... i think...i will have to go take one more look to make sure

The purpose of the ALDA is to provide the correct amount of fuel for the air induced into the engine to maintain the proper maximum air fuel ratio. If intake manifold pressure is increased, the maximum amount of fuel that can be delivered will be increased(at least until you hit the full load stop). If you increase the boost you do not need to tweak up the ALDA as it provides the correct amount of fuel based on the absolute intake manifold pressure. It is however possible to push the ALDA beyond its designed limits and it will stop increasing fuel at this point.

Since diesels normally run with an excess air ratio for polution and fuel economy reasons, tweaking up the ALDA gives you more fuel to burn and therefore more power. This is also increases the amount of heat the engine has to deal with and makes nice little puffs of black smoke when you romp on the pedal.

__________________
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

When you "tweak" the ALDA for more fuel, you effectively push the fuel curve to the right and the ALDA is now closer to it's design limit. Therefore, it will reach this limit at a lower boost level.

If it reached it's design limit at a boost of 13.5 psi, and you tweak it, it will now reach it's design limit at, say, 11.5 psi. No further fuel is available unless the full load stop is adjusted.

I've always been curious to see if an ALDA tweak with a typical turbo running 9 psi would then result in the ALDA reaching it's design limit??

I guess you need to get the mighty vac out

Seriously, If you had an IP pump on a bench you could hold it WOT and provide a vacuum and apply boost pressure to the ALDA and find out.

__________________
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