ALDA removal........OM603

[Brian Carlton]

Thanks to the groundwork laid down by Forced Induction, I decided to remove the ALDA from the '86 SDL. It's always been a dog off idle and it was time for some adjustments. Turns out that the ALDA is virgin. Never been tampered with.

So, with Lance's info, I plugged the pressure line from the overboost solenoid and took it for a spin.

Lo and behold, the vehicle is transformed. Just 1/4 pedal will move it out relatively smartly and 1/2 pedal will outperform the city traffic.

But, the most important issue is the smoke.

There was no smoke at any operating point provided the rack was not more than 2/3 open.

I was able to get a bit of smoke if I mashed the pedal below 2500 rpm. But, if you drive the vehicle with any sense of reserve, you'll never get it to smoke.

Now, the best part of the story:

Two 0-60 runs on the same roadway........in opposite directions.......using the G-Tech Pro:

9.79 seconds

10.32 seconds

This vehicle is faster than hell without that ALDA installed.

So, all you 603 fans, my strong advice is to simply get rid of the ALDA and all the associated plumbing. You clearly don't need it.

And, my thanks to Lance for the groundwork that generated this thread. The general consensus for the need of an ALDA to control excess fuel is clearly far too conservative.