ALDA removal and retaining decisions. - Page 2 - PeachParts Mercedes-Benz Forum

Shortsguy1 · #16 03-12-2016, 11:43 PM

The answer to my question in the other, nearly identical version of this thread is sadly no.

imryanmoriarty · #17 03-13-2016, 11:20 AM

Quote:

Originally Posted by shertex

Yes, yes, and yes. Make sure you take to the junkyard a 24mm wrench and a 27mm wrench. Sometimes they are a pain to remove.

See this for details. OM603 ALDA removal instructions

Cool, so the ALDA is the same for 617 and the 603? Awesome, thanks.

vstech · #18 03-13-2016, 12:13 PM

Quote:

Originally Posted by Dan Stokes

Tried THAT mistake on Mutt the Race Truck. It really doesn't work. An oversimplification but basically the ALDA adds fuel when under boost so removing it takes away fuel under boost. Taking fuel away from a Diesel is NOT the way to make more HP. Fix the ALDA and work with it's range of adjustment to get a good seat of the pants feel - unless you have access to a dyno so you can adjust for max HP (preferred).

When I removed mine I didn't properly understand the ALDA's function so I followed the on-line "wisdom" which in this case proved to be wrong.

Dan

This is incorrect.

The ALDA reduces fuel prior to boost. Removing it provides maximum fuel at all boost levels without reduction.

that's why it smokes if you floor it with the ALDA removed. Wastes fuel and if the wastegate seizes melts your engine...

vstech · #19 03-13-2016, 12:16 PM

Quote:

Originally Posted by imryanmoriarty

Not to further hijack your thread, but how exactly does one go about deleting the alda properly?

Sooo... what was the question? And WHY would you post a question less answer in a thread?

imryanmoriarty · #20 03-13-2016, 01:36 PM

Quote:

Originally Posted by vstech

Sooo... what was the question? And WHY would you post a question less answer in a thread?

I'm not sure I follow.

babymog · #21 03-13-2016, 01:47 PM

I think that the implication is that removing the ALDA is not proper, therefore the question invalid?

Where I agree with this in principal, I really don't care whether people decide to remove their ALDAs, provided that they know that there is some risk of overboost if the wastegate fails, probably a puff of smoke at the drop of the pedal without it, and a potential for reduced fuel mileage around town (stop-start on/off "throttle" driving). I feel no need to chastise you or tell you that your car will explode without it.

On the upside, removing it will restore off-boost launch without actually adjusting or repairing the ALDA.

I'm currently running adjusted ALDAs on both 603s, have on several 603 and 602 turbos in the past, and have no complaints about the performance of these engines with proper adjustment. If the ALDA is functioning properly and turned a bit rich, the max. fuel flow internal to the pump significantly affects the amount of enrichment available anyhow, even at 600rpm. There are people like GSXR, Sixto, me, and others who have tried it both ways and with turned-up IPs, and found that running an ALDA is not an impediment to power output.

mannys9130 · #22 03-13-2016, 04:25 PM

The ALDA won't ever impede power if it's properly adjusted. Lots of people don't understand that, and they want to delete it instead of spend some time and dial it in.

imryanmoriarty · #23 03-13-2016, 04:59 PM

I guess it's a philosophical difference.

Personally I'd rather take the time to remove an unnecessary layer of complexity and the maintenance it requires than properly maintain it.

vstech · #24 03-13-2016, 05:21 PM

"Is the dark side more powerful? "

"No! Quicker, more seductive the dark side is..."

dude99 · #25 03-13-2016, 06:06 PM

Quote:

Originally Posted by vstech

"Is the dark side more powerful? "

"No! Quicker, more seductive the dark side is..."

lol, I love it

superapan · #26 03-14-2016, 09:49 AM

I got a turbo converted OM617.912, the IP replaced with a turbo one manually set "just right". The ALDA has never been connected. Here's a vid Dieselmeken made when servicing my car: https://www.youtube.com/watch?v=6DWfLImDFgY

yuke · #27 03-15-2016, 08:47 AM

So how does one adjust the wastegate to get maximum boost on a kkk turbo and then dial the alda in on my 85 300 SD 617?

babymog · #28 03-15-2016, 09:45 AM

There are several threads on this in the diesel performance forum, this one is a good start: OM603 semi-super pump testing, fitted with Bosch 6.0mm elements

In this thread GSXR had worked with turning up a KKK, but had limited success due to the design of the turbo. Still, it can be done and if you have increased fuel flow to use the additional air, you can add a small amount of power to your stock setup and a noticeable amount of poke off the line.

This thread is 603, and there are many more threads in the Diesel Performance Tuning forum for 617s, but the ALDA and KKK turbo are of the same basic design.

I've personally never had my hands in a 617, but threads here outline how to check and clean the ALDA plumbing from the banjo-bolt to ALDA as a first step, then move on to checking the ALDA for pressure leak and adjusting, and of course a boost gauge to check for proper turbo/wastegate operation would be next.

86-300sdl · #29 03-15-2016, 01:59 PM

I solved my doggy low rpm (pre turbo spool) performance by simply removing the adjustment seal and turning the adjustment screw one full turn. I started with 1/4 turn adjustments. I notice no difference in higher RPM performance.

For years I didn't want to mess with the seal thinking it might help the value (i.e. "original" factory set) or some silly thing. Then I found an alda at the PNP with the seal intact that I could use later if needed.

Proceeded with the screw adjustment and now have decent get up and go performance. No smoke screens etc.

Try it...you'll like it!