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  #1  
Old 10-01-2011, 01:15 PM
Olivier's Avatar
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boost a bit like a yoyo...

Hello,
Got few little mod on the car and I am wondering if the waste gate is acting properlly. I did the mods before the boost gauge, then I don't know if its a normal acting or if its due to too many tinkerig...
What is happening is the boost goes up to 22 PSI,then the wastegate open lowering the boos to 15PSI and then re-ajust itself and goes to 18/ 19 PSI. I think the ECU get a fright and fully open the gate?
This mean the car pull hard, has a little less pull when the gate open, then keep pulling when the gate adjust itself. Sometimes the boost goes a little up and down too between 15 and 20.
Is that normal behaviour or should I have a constant going up boost in a nice up curve?
Thanks.
Olivier

__________________
E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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  #2  
Old 10-02-2011, 08:27 AM
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Location: Northern Georgia
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Don't have a specific answer, but I can tell you my 85 300CD's KKK turbo is turned up and runs the curve steady and smooth to max (about 20) if under full throttle. And will hold it as long as full throttle is held. releasing the throttle opens the waste-gate (you can actually hear it dump) and the boost will drop down to it hi-way boost of around 12 at 65 and be steady. So, in other words, mine does not yoyo.

Doesn't show the boost, but give you an idea of how it runs.

300CD 3 seperate spped tests the day after replacing engine mounts. - YouTube
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Old 10-03-2011, 02:54 PM
Olivier's Avatar
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Cheers.
Mine is different, after awhile and when the rev goes highter the boost get lower.
I was looking at the boost when I take the foot off the accelerator and at 70mph no acceleration there is a boost of about 2 1/2 PSI. ( not 5 like I thought, sorry)
Perhaps I need to open the wastegate a little more, it might not open totally or not fast enough, then this could be the reason why the ECU is freaking out?
This mean another time under the beast, taking the underbelly off and play with the acuator
Oh well...
Thank you again Ngarover, I will try to achieve a proper curve
To be continued.
Olivier
__________________
E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...

Last edited by Olivier; 10-04-2011 at 01:22 PM.
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  #4  
Old 10-04-2011, 08:22 AM
ngarover's Avatar
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Join Date: Oct 2010
Location: Northern Georgia
Posts: 1,928
Quote:
Originally Posted by Olivier View Post
Cheers.
Mine is different, after awhile and when the rev goes highter the boost get lower.
I was looking at the boost when I take the foot off the accelerator and at 70mph no acceleration there is a boost of about 5PSI.
Perhaps I need to open the wastegate a little more, it might not open totally or not fast enough, then this could be the reason why the ECU is freaking out?
This mean another time under the beast, taking the underbelly off and play with the acuator
Oh well...
Thank you again Ngarover, I will try to achieve a proper curve
To be continued.
Olivier
Hmmm, at 70 when I take my foot out of the peddle, my boost is 0. When I hold a steady 70 my boost is a rock solid 8. IF I down shift and punch it, it jumps to to around 18. ( my kickdown does not work so I have to down shift)
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  #5  
Old 10-04-2011, 01:24 PM
Olivier's Avatar
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Join Date: Jan 2009
Location: Edinburgh
Posts: 570
Cheers, I just double check, I got 2 to 3 psi at 70... Not 5 Psi as I thought.
I was doing this through memory and I thought the needle was in between 0 and 10 but it was between 0 and 5... sorry for the booboo. Still its some boost while there is no foot on the pedal...

__________________
E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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