Boost curve very wavy, graph inside, opinions welcome
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From: Atlanta
2006 E55 AMG
Boost curve very wavy, graph inside, opinions welcome
The car is heavily modded with belt wrap and 180mm CP with 77mm clutched upper. The boost curve is all over the place, what are your guys thoughts on potential causes. As a result, it is not making the power it should either!
Thus far I have smoked the motor with no leaks. I do have a new bypass valve on the way too to rule that out. Has anyone else experienced this type of curve and possible solutions.
Thx fellas
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From: South Africa
2018 E63s AMG (Current) 2011 CL63 AMG (Sold) 2005 CLS55 AMG (Sold) 2004 C32 AMG (Sold)
Does seem way under power for that pulley setup, were you logging intake Temps as well? My boost also jumps around a bit like that. Never understood why, and I also have a bwk to illiminate any slippage.
Last edited by C32owner; Aug 5, 2016 at 04:22 PM.
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From: SWFL
E55, E320 CDI , CLA250, Jag XJ Supersport
Just a thought. Needswings says that the surge tank gaskets start to leak at 14psi.
Here's link:
http://www.needswings.com/needswings...-gaskets-m113k
Here's link:
http://www.needswings.com/needswings...-gaskets-m113k
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A Merc
99lightning that would be better than a bwk IMO.
Finny's idea for the tensioner adjuster was better but he never made it. He gave me the info on in but needed a sizable run to make it, too bad because the idea was great
Finny's idea for the tensioner adjuster was better but he never made it. He gave me the info on in but needed a sizable run to make it, too bad because the idea was great
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From: Joshua, TX
2004 AMG E55
Another thing to see if it is mechanical or not would be to datalog timing during the run. I use Torque pro. You can then plot it and see how much timing and where it is being reduced.
If the do not correlate with the dips you have a mechanical issue more than likely with what you have done so far. Less timing = richer mixture.
One other way to look at slip is a timing light. If it is adjustable for advance you can point it at the belt and if it slows down you will see it with the light. Takes some practice but works well for a final diagnosis. You may have to put a line on the belt with a sharpie so you can see it.
If the do not correlate with the dips you have a mechanical issue more than likely with what you have done so far. Less timing = richer mixture.
One other way to look at slip is a timing light. If it is adjustable for advance you can point it at the belt and if it slows down you will see it with the light. Takes some practice but works well for a final diagnosis. You may have to put a line on the belt with a sharpie so you can see it.
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2002 CLK 55 AMG cabriolet Eurocharged
Did the curve happen after the mods or all of the sudden like something failed?
Hmmm?
Definitely something leaking or sensor amiss. The MAP runs the bypass valve.
If the engine is not too smoked find a way to close the BP valve for boost testing. C4 Dev might work,this will eliminate charge tank culprits and belt slip.
Caution when running the BP valve closed without custom tuning.
Cheers, Gator
I am old school when it comes to vacuum/pressure leak testing. They did not have smoke testing when I was servicing cars.
Hmmm?
Definitely something leaking or sensor amiss. The MAP runs the bypass valve.
If the engine is not too smoked find a way to close the BP valve for boost testing. C4 Dev might work,this will eliminate charge tank culprits and belt slip.
Caution when running the BP valve closed without custom tuning.
Cheers, Gator
I am old school when it comes to vacuum/pressure leak testing. They did not have smoke testing when I was servicing cars.
Last edited by GatorMB; Aug 6, 2016 at 12:28 PM. Reason: added content
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2011 Cadillac CTS-V
Your probably heat soaking the **** out that b**** you should be over 15 pounds at least with that combo!! I no longer have a e55 so my advice is useless but I would say log it during a pull and see where timing is being pulled.. Gl bro
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From: Atlanta
2006 E55 AMG
It has a trunk tank, KC and meth. Started the pulls at 50* in these runs and ended at 130* so it is not to bad.
Hopefully the bypass and a new tensioner fix the problem.
Hopefully the bypass and a new tensioner fix the problem.
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e55-03 , m3 e36 irs drag car
its just like mine buth whith overall lower boost
mine showed no leak either, and i have tried a secondary tensioner makes no more boost just snaps the bellts
hope you find a fix to this
mine showed no leak either, and i have tried a secondary tensioner makes no more boost just snaps the bellts
hope you find a fix to this
Last edited by bmwm3turbo; Aug 7, 2016 at 12:23 PM.
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From: Atlanta
2006 E55 AMG
You use a brand new tensioner brotha? How much boost did you show, same power level?
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e55-03 , m3 e36 irs drag car
mine tensioner is 6 month old
my boost sometimes se as low as 13psi and spikes to around 18 psi
im on a 68mm pulley, bypass valve, or we are overspinning the sc is my guess
my boost sometimes se as low as 13psi and spikes to around 18 psi
im on a 68mm pulley, bypass valve, or we are overspinning the sc is my guess
Last edited by bmwm3turbo; Aug 7, 2016 at 03:57 PM.
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From: DownEast Maine
CLS 55 AMG E500 ML320
Is this something you could share? Maybe someone else would make a few.
i am happy now, did a pressure test this morning and for the first time i found an intake leak on the right side bank
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2006 E55
OK, let's get back on topic. Good thread and feedback...
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From: Atlanta
2006 E55 AMG
Had you smoked the motor prior and it all came back tight and the latest pressure test revealed a leak?
