Dyno results here

107hp, 194.8lb/ft torque at the wheels.

1980 240D 3.0VNTi 215k miles
Modifications: OM617.952, 4-speed manual, GT2256V VNT turbo, air-air intercooler, W115 300D intake, 3.46 diff, ALDA/EGR removed, Pyrometer/Boost/Exhaust psi gauges, bypass oil filter and Mobil-1 5W-40 synthetic oil.

The second picture shows how much boost I have at idle, it drops to 0 when I open the vanes.

Post your dynamometer results if you have some.

[Bajaman]

Any idea how that boost curve looks compared to a stock turbo? Doesn't look like much boost below 2100 or so like the stock turbo.

Here is my sheet from 2-13-06 with the KKK K26 turbo.

The boost curve is nearly opposite.

[Bajaman]

I notice now that the boost starts at 7 psi, thats pretty impressive. Did they not load the engine below 2000 rpm?

Originally Posted by Bajaman

Did they not load the engine below 2000 rpm?

Just whatever it took to keep the rollers moving until he mashed the throttle.

Here is the graph where the vanes were set always open. Notice how the boost curve has a slightly more concave shape to it and starts at only 2psi.

[ConnClark]

Originally Posted by ForcedInduction

Here is the graph where the vanes were set always open. Notice how the boost curve has a slightly more concave shape to it and starts at only 2psi.

Also notice how your low end torque fell. The higher boost gave you about 4% more torque.

[Brian Carlton]

Originally Posted by ForcedInduction

Here is my sheet from 2-13-06 with the KKK K26 turbo.

The boost curve is nearly opposite.

Now, there is a good looking set of curves. If the shape of the curve could remain the same and the torque peak raised...........it would be fabulous.

Originally Posted by Brian Carlton

Now, there is a good looking set of curves. If the shape of the curve could remain the same and the torque peak raised...........it would be fabulous.

Yes, but the engine always had an early torque peak, it just never had a turbo that could supply air for it show.

I got 65lb/ft more torque, 10hp more power and much better drivability from only "bolt-on" changes with no additional fuel above stock, with better fuel economy on top of it!

Let me dust off my old PeeCee and see if I can get an overlay of my oldest and most recent graphs. Superflow does not have a Mac version of their dyno chart software.

[Brian Carlton]

Originally Posted by ForcedInduction

I got 65lb/ft more torque, 10hp more power and much better drivability from only bolt-on changes with no additional fuel above stock, with better fuel economy on top of it!

Yes, I can see why you're quite pleased.

But, I'm still baffled by the inverted torque curve........it's just not common on these engines.

[bgkast]

Once I fix and sell the '79 I'm using the cash to upgrade and am aiming to beat that 107 HP.

Good job!

[KarTek]

Oh wait, you wanted Mercedes dyno sheets...