How do I drive turbo 300d

[123mike]

i had non turbo and it felt like it would always pull me up a hill. With a turbo 300d, seems like I have to feather the gas pedal so the engine keeps climbing. Is that a turbo thing? I added a boost gauge and if the gauge is pegged and I don't feel acceleration, I might as well let of the gas because it's not speeding up until I crest the hill. Mike

[tjts1]

Check if your ALDA is functional or the line to the ALDA is clogged. Or just remove ALDA and take it for a test drive.

[MBeige]

A non-turbo also has different gearing than a turbo.

Check your throttle linkages for any play or worn rubber bushings.

Also check your ALDA/boost lines to make sure there aren't any leaks.

[jay_bob]

I agree, check the boost sensing hose from the manifold to the injection pump.

If you have tied in a boost gauge and it is showing boost but you are not feeling acceleration then chances are it is the ALDA not getting the boost signal due to a clogged hose or the ALDA has failed.

You did not say what year 300D you have. The systems are arranged slightly different between the 85 and older (123 with OM617) and the 86 and newer (124 with OM603) but they work the same.

The idea is that the turbo puts more air into the engine (aka forced induction or boost) but if you do not also increase the amount of fuel then the engine cannot make more power.

Too much fuel for the amount of air = black smoke. So you need control over the fuel. That is what the ALDA does. If it is not getting the boost level it cannot increase the fuel input.

[123mike]

I have an 83 turbo motor and trans hooked to a non turbo differential.

With the gear ratio difference I figured I would really go.

Since the manifold vac connector went straight to Vac Gauge. Maybe i was shoving too much air into the pistons?. I unplugged the vac gauge hose this morning and left it open. I think it was a little faster.

Do I have an alda on a 83 motor?. Mike

[vstech]

...

manifold has nothing to do with vacuum on a diesel, especially a TURBO diesel.

the manifold is boost pressure. and it needs to be plumbed into the square device sitting on top of your injection pump. without this connection your motor will never know it has boost.

[Stretch]

Originally Posted by 123mike

I have an 83 turbo motor and trans hooked to a non turbo differential.

With the gear ratio difference I figured I would really go.

Since the manifold vac connector went straight to Vac Gauge. Maybe i was shoving too much air into the pistons?. I unplugged the vac gauge hose this morning and left it open. I think it was a little faster.

Do I have an alda on a 83 motor?. Mike

vstech has shown you the pipe (well a pipe) going to the ALDA - this goes to the connection on the manifold...

...the other problem you're experiencing is probably due to the differential gearing. Past about 2500 - 3000 rpm the car is going to make more noise than movement - well it will feel that way! You are going to be very quick off the line - traffic light king - but even the sparrows will pass you once you've gone further than six paces...

...especially if you have the 3.64 240D differential. (A non turbo OM617 has a 3.46 {four and six positions have changed} - a turbo OM617 {OM617a to its friends} has a 3.07 or a 2.88)

[vstech]

240D uses a 3.69:1

[Stretch]

Originally Posted by vstech

240D uses a 3.69:1

Hmmm

Now where did I get the 3.64 from...

...it'll come back to me

[oldsinner111]

max boost should be around 14 psi.I made a homemade valve in the rubber line to turbo.

[123mike]

Wow, that did it. Re positioned the vac lines at Lunch.
I hear Turbo again. I feel acceleration again, Yippee, Thanks.

I figure I lose 10 MPH with the differentials speeds. Speed says 70 I'm going 60 mph. The good thing is I get at 46 MPG from odometer miles! Mike

[sixto]

Originally Posted by Stretch

Hmmm

Now where did I get the 3.64 from...

...it'll come back to me

You might have a chipped crown gear tooth

Sixto
83 300SD

[123mike]

w123

1977–1978, 230, M115, 3.69 (3.58) 1.1 Liter
1977–1983, 240D, OM616.912, 3.69, 1.1 Liter
1977–1981, 280E/280CE M110, 3.58, 1.1 Liter
1977–1985, 300D, OM617.912, 3.46, 1.1 Liter
1979–1980, 300TD, OM617.912, 3.46, 1.1 Liter
1981-1984, 300TD, OM617.952, 3.07, 1.1 Liter
1982-1984, 300DT, OM617.952, 3.07, 1.1 Liter
1982–1984, 300CD, OM617.952, 3.07, 1.1 Liter
1985, 300TD, OM617.952, 2.88, 1.1 Liter
1985, 300D, OM617.952, 2.88, 1.1 Liter
1985, 300CD, OM617.952, 2.88, 1.1 Liter

[charmalu]

Originally Posted by 123mike

Wow, that did it. Re positioned the vac lines at Lunch.
I hear Turbo again. I feel acceleration again, Yippee, Thanks.

I figure I lose 10 MPH with the differentials speeds. Speed says 70 I'm going 60 mph. The good thing is I get at 46 MPG from odometer miles! Mike

Once again, it is not a vacuum line from the Manifold. It is a Boost line.

Hate to pop your bubble, but no way you are getting 46mpg.

Charlie

[charmalu]

Originally Posted by 123mike

w123

1977–1978, 230, M115, 3.69 (3.58) 1.1 Liter
1977–1983, 240D, OM616.912, 3.69, 1.1 Liter
1977–1981, 280E/280CE M110, 3.58, 1.1 Liter
1977–1985, 300D, OM617.912, 3.46, 1.1 Liter
1979–1980, 300TD, OM617.912, 3.46, 1.1 Liter
1981-1984, 300TD, OM617.952, 3.07, 1.1 Liter
1982-1984, 300DT, OM617.952, 3.07, 1.1 Liter
1982–1984, 300CD, OM617.952, 3.07, 1.1 Liter
1985, 300TD, OM617.952, 2.88, 1.1 Liter
1985, 300D, OM617.952, 2.88, 1.1 Liter
1985, 300CD, OM617.952, 2.88, 1.1 Liter

Yep, you`re learning.

We already knew that.

Also the 300SD uses the 3:07 and the 2:88 Diff.

If you decide to change the Diff. then you will need to use the Speedometer that goes with it.
They are geared together.

Charlie