ALDA Adjustment
Hi all,
I did a quick search on how to adjust the ALDA to get a bit more power off the line, but came up with nothing on how to do it properly.:o All I'm really after is for a bit more scoot when taking off so I can maneuver in traffic a bit easier/safer. Any help? Thanks.:) |
Loosen the 10mm lock nut and back out the centre screw all the way.
You must check that the boost pressure is getting to the i/p through the banjo bolts and hoses across from the intake log and across the boost cut-off relay..next to the brake booster. Most see boost between 9 and 12 psi. I run mine at around 19 psi. Others will chime in with info' and links to previous posts about extra boost adjustments....it's been covered many times. You may need to adjust the i/p load stop and torque screws too. |
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Before you go popping off about what I need to do, check with me about what I have done. Seems you didn't read my entire post. |
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Well I got around to backing out that screw, and I don't really notice much increase in power off the line. Is there anything else I should be checking?
Also, is there a way to turn up fueling a bit on the pump? |
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power gurus
Check Superturbodiesel.com for info on various ways of getting more power. cheers Dan
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by removing the ALDA off the IP completely first (yes), to see if any adjustment of it would help. (See other threads on its removal.) Just loosen it off the IP, leaving it connected to all its hosework, but not riding the injector pump. Go for a drive with it off. If you get immediately noticeable better off-the-line performance without the ALDA, then adjustments will yield expected improvement. Otherwise with no extra power, then no amount of playing with ALDA (at this stage) will help your more immediate issue (whatever it is - solve that first, e.g. fix your dragging brakes, or hoist that anchor you are towing). There are 2 ways to adjust an ALDA: shim it up, or play with the screw. Playing with the screw risks destroying its atmospherically tight enclosure, and aneroid capsules within. I recommend shimming the whole ALDA up where it meets the IP, or total removal and leave it off. Note that shimming too much is equivalent to total removal, so you can fool yourself by seeing the ALDA there, yet doing no function. The "sweet spot" of a functional ALDA that you're looking for is where you still get best off-the-line performance without blowing black smoke. Start the shimming process with black smoke, then use thinner shimming to reduce smoke. You drop the shim into the nut holding the ALDA down to the IP, the type I used were copper crush washers. (I seemed to have a lot around I think from oil filter/kits you get from Benz, each one comes o-ring and crushers for the drain plug and oil canister center plug.) A lot of people remove ALDA completely and reduce smoke with careful input of the right leg. i.e. press less on the pedal. Black smoke is excess fuel making no extra power, ie. wasted fuel. Either YOU can modulate it with your muscles, or try to let the ALDA modulate it on your behalf. That is all it really does. And you know that turbo is not in play off the line. You have to spool up to 2500 to make meaningful use of it. So at low speed low RPM launch stuff, that's when the ALDA is "doing its job" (of limiting your power). Worry about tweaking your turbo wastegate etc if achieving top-end power / speed is your issue. Ignore turbo things until you are scooting off the line and smiling. I'm not a big fan of ALDA's usefulness, that is why mine sits on the bench, not on the car. Read past posts and endless debate of pro's / con's of what else the ALDA might do in an overboost situation. My stance on that was to install a boost gauge with alarm in the car. At my altitude it's a real treat to see 1 bar / 15 psi boost under hard pressed conditions. |
shim with 1.20mm
I just added a shim (1.20mm) to my ALDA today and it appears to have improved the 0-2200 RPM Performance. However this is subjective at the moment. I have attempted to measure the baseline prior to this modification using my GtechPro. I hope to retest in the next few days to report back with the new information for further comparsion.
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Well I thought I should chime in here again with my findings.
I completely removed the ALDA, and low end performance improved quite a lot. It don't even 'roll coal' if I floor it from a standstill. I'll be shimming the ALDA and keeping the hoses disconnected so as to keep dirt and crap from getting into the pump. I think the next thing is to turn up fuel a little bit for more top end power. :P |
what is the ALDA? im not new to diesel but new to mercedes. is the banjo bolt that clogs the one on the filter above the IP. im cleanin out the cat soon and im thinkin about muffler removal. air cleaner upgrade soon too. i love this car but this one is so weak. im gettin passed by loaded tractor trailers on inclines and off the line.
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