Turbo Wastegate arm "ADJUSTMENT MOD" And full test results

Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby burnah on Tue Nov 15, 2011 10:06 pm

Cowboy Dave wrote:Well that depends on how game you are. There's a ChipIt chip......evo intercooler and no doubt some other stuff I've missed.



Crikey! How much if I take the lot? :lol:
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby Tony on Tue Nov 15, 2011 10:28 pm

SinWolf wrote:So....

Nothing that we can do to our 2.5's ????

:evil:


Plenty can be done with your 2.5 with either turbo set up. 8-) Not much point upping the boost with out adding fuel by either a chip (rail or injector type), tune, injector nozzle up grade etc

There are ways off fooling the MAp sensor so wont code high pressure etc. :roll:

To adjust the boost on a VGT system with out a reflash, it requires some form of changing the target voltages the ECU reads from the MAP sensor. This is how the VGT knows when to release the vacuum that holds it over to spool position. If you dump enough fuel in at higher RPM they will still see over 25 psi even with the VGT in overrun position.

If a waste gate set up, is same as 3.2 in effect.
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby sierra on Wed Nov 16, 2011 8:14 am

I run my ML 2.5[wastegate] at 20psi up 4psi+ and it's never missed a beat.
The ECU seems to be set at 22psi for a code from other posts?

If anyone knows how to coax more fuel without using a chip or remapping the software I would appreciate the info.
Nothing dramatic, just enough to compliment the extra boost.
Could scangauge offer the facility to remap the fuel in the future? That would be a great solution. 8-)
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby SinWolf on Wed Nov 16, 2011 4:02 pm

So if I don't have the "threaded" arm with the nut, then I have the VGT system... ?

Because my "arm thingy" is not threaded :(
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby sierra on Wed Nov 16, 2011 6:35 pm

SinWolf wrote:So if I don't have the "threaded" arm with the nut, then I have the VGT system... ?

Because my "arm thingy" is not threaded :(


Yours is the same as mine, the 100kw 308Nm?
In Oz it's fitted to the 4x2 version with the ML 4x4 getting the 3.2[threaded actuator] and the MN 4x4 getting the 2.5 with the variable vane compressor.
The waste gate actuator has no nut on our model and runs at about 15.6psi max
You can fit a 'good quality' bleed valve into the actuator hose to increase the boost using a boost gauge or scangauge.
You will get more power at 3/4 throttle than at full throttle on the standard boost but extra fuel is needed to release the power at full power.
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby jester on Tue Mar 13, 2012 6:19 pm

well i gave the waste gate mod a try, i removed the nut entirly and wound it all the way.
"I didnt drop the clip" :D
took it for a run definetly feel boost come on a little earlier, but no overall increase in power.
scan gauge shows boost hitting 16.2 psi with the occasional spike to 16.8psi. the missus hasnt noticed anything different when driving, but seem to be sucking alot of diesil, not sure if this a coinsidence or not, but only getting about 550km out of the last 2 tanks of juice. Goes in on monday for 90k service, hoping my mechanic might pick up on why chewing so much juice. :roll:
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby chick_magnet_0001 on Tue Mar 13, 2012 7:49 pm

the added fuel use would be because its coming to teh end of its engine life.. mainly due to the first owner :twisted: :lol: :lol: but seriously i haven't noticed any added fuel use when i did this mod when i started driving normally (after 2-3 tank) because i was just trying to beat the last best of 17.3psi :lol: :lol: is your unifilter clean...?
jops had the blanking plate in im pretty sure so carbon shouldn;t be an issue
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby jester on Tue Mar 13, 2012 7:55 pm

yeah blanking plates was already installed. i expected the 1st 1/4 tank to go quick for the same reason, trying to get it past 16.8 and film it at the same time......but the camera seemed to be really shaky when winding it out through the gears :lol: maybe shouldnt of been doing it on the main road, but oh well.... hopefully the service will sort some things out.
Never use force, use a bigger hammer. If it breaks, it needed replacing anyway.
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Turbo Wastegate arm "ADJUSTMENT MOD" And full test results

Postby joelzo on Wed Mar 14, 2012 3:33 pm

I just adjusted the wastegate arm on my mn 2.5 4x4.

Its doesnt look anything like the pics up here though.

Its used to reach 18.7 psi on scangauge and now hits 22.9 psi pretty quick but doesnt seem to feel much different to drive though??
hmmm 255 character limit hey...
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby joelzo on Wed Mar 14, 2012 3:59 pm

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hmmm 255 character limit hey...
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby joelzo on Wed Mar 14, 2012 4:02 pm

On the MN 4x4 2.5...

In the photo above you can JUST see the lock nut at the bottom.

If you loosen this theres about 4-5mm thread downwards to unscrew it. Then adjust the knurled nut down by hand til it hits the lock nut.
hmmm 255 character limit hey...
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby joelzo on Wed Mar 14, 2012 4:09 pm

Just took a better pic sorry hard to get a good angle. And its hot!!
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby coxy47 on Wed Mar 14, 2012 4:52 pm

Forgive my ignorance but i want aware that this was possible on the MN since the boost pressure is manually controlled by the variable geometry turbo?
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby Kegsy on Wed Mar 14, 2012 5:14 pm

Boost pressure isn't controlled via the wastegate anyway... Even on the ML.

Adjusting the wastegate will only change when boost is delivered, not how much. This may indirectly change the "spike" value, but constant boost will remain unchanged.


On the MN, That actuator tells the VGT when to hold the compressor into the attack position. Adjusting that thread would maybe make this happen slightly earlier, but IMO wouldn't be enough to worry about.
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby coxy47 on Wed Mar 14, 2012 5:18 pm

Ahh ok. Yeh i knew it wasnt controlled by the wastegate on the ML I didnt word it very well i guess.

I was under the impression that the MN was purely electronically controlled though via the MAP reading. Obviously im wrong. Not sure where i got that idea. :roll:
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby Longranger1 on Wed Mar 14, 2012 6:45 pm

I'd be wary of this, you may cause an excessive backpressure issue on the engine side of the VGT. Effectively all you have done is close the vanes a little which has the effect of boosting slightly earlier.

The actual boost pressure is dictated by the ecu and you may end up with the ecu throwing codes.

It may happen quickly or eventually or not at all given the nature of these things. :?

With more backpressure the egr will pass more exhaust gas unless blanked.

Probably as Kegsy sayes it may not be anything to worry about - the ecu will recompensate to a degree.

Keep us posted as to the outcome.
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Turbo Wastegate arm "ADJUSTMENT MOD" And full test results

Postby joelzo on Wed Mar 14, 2012 8:18 pm

Went for a drive tonight and feels to me basically the same but as people have said, it just spools up instantly.

Interestingly, also noticed the turbo is actually way quieter now. Can't hear it much at all. Especially when i used to back off the throttle id really get a noticeable whistle. Now nothing.
hmmm 255 character limit hey...
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby cookoy on Wed May 09, 2012 6:10 pm

if i were to adjust the rod of the wastegate flapper on my MN without doing any other mods tot he engine ie chip upgrades, is it worth it? will there be any difference?
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby Tim007 on Wed May 09, 2012 7:12 pm

I am pretty sure you can add as much boost as you like but without adding the right amount of fuel as well it will have little to no effect.
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Turbo Wastegate arm "ADJUSTMENT MOD" And full test results

Postby joelzo on Wed May 09, 2012 8:05 pm

Tim007 wrote:I am pretty sure you can add as much boost as you like but without adding the right amount of fuel as well it will have little to no effect.


Tim i dont believe that is true. On the diesel you will see performance gains by upping the boost only without adding fuel. From my understanding, upping boost only can actually help to keep EGT down.
Correct me if i'm wrong guys.

I should note i have returned my actuator arm back to standard. Didnt feel any gain from it.
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby Tony on Wed May 09, 2012 9:15 pm

Would you believe there is a bit of science with setting a diesel up correctly. You will get no gains with overdoing it on the boost. Infact, after point, lowering the EGT a lot will take power away as blows the flame out in effect. Also, the turbo can be pushed past its efficiency range very quickly. Especially the VGT set ups.
None of you want to be pushing the 3.2 past 25 psi or the 2.5 past 32psi as will both result in an early retirement of the turbo. :roll: :lol:

With out a dyno, air fuel meter etc, its best to keep your max load EGTS in the range of 420 to 650c at the dump for best safe performance (depending on fueling) and you will be close. 8-)
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby cookoy on Wed May 16, 2012 11:03 am

well i checked my turbo, and the arm that controls(?) the waste gate does not have any adjustment whatsoever.. hmmm go figure
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby sierra on Wed May 16, 2012 2:08 pm

cookoy wrote:well i checked my turbo, and the arm that controls(?) the waste gate does not have any adjustment whatsoever.. hmmm go figure


Do you have the 2.5 diesel with the standard actuator? Not the 2.5HP with the variable vane jobbie?
If it's the former, same as mine, it didn't get any adjustment but you can run a decent bleed valve type boost regulator up to 20psi without any problems. 22psi seems to be the ECU overboost limit.
It's frustrating though, because you get more power at 3/4 throttle than you got at full throttle before but you need more fuel to unleash the full potential.
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby cookoy on Wed May 16, 2012 2:38 pm

thanks sierra, so if that';s the case then a chip should be part of the equation then... so i guess it'll have to wait, these chips cost an arm + a leg + some, here in the philippines
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Re: Turbo Wastegate arm "ADJUSTMENT MOD" And full test resul

Postby sierra on Wed May 16, 2012 3:08 pm

The extra boost is worth the money, you can definitely feel the difference.
A scanguage or similar is a must have though, to read the boost as you increase it and to remove the code if you go too far and upset the ECU.
Can you buy from overseas through eBay without be hammered by duty?
We are duty free up to AU$1000.
If you are then all the UK L200 goodies would be available as well as Oz.
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