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Weird boost response.


kayzarh
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so ive been logging with evoscan and ive made this graph to see how my car is boosting.

A graph for Engine Load/RPM at WOTScreen Shot 2017-03-10 at 00.36.41.png

What could be the cause of my problem? i hear a rattling noise from my turbo, but i dont know if this is the timbre of a decat downpipe or is my turbo dodgy?

im hitting like 9.6psi at 3.4 k rpm, then my boost completey drops then shoots to 11psi then drops and shoots.

ive checked intercooler hoses, lines etc, also changed the gaskets and up pipe and downpipe.

will wake up tomorrow and get some fairy water on the upipe gasket for the turbo.

anything else ive missed out?

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40 minutes ago, savage bulldogs said:

Give your wastegate /actuator arm a wiggle as it could be loose causing the rattle and the boost solinoid to struggle to hold boost .

Yeh, it seems to be loose? i can move it with two fingers and it has a lot of rattle. how can i tighten it (googling too)

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i really felt that faster spool!!!

BUT; me no likely this no knock at around 3500-4000

Screen Shot 2017-03-10 at 09.35.56.png

this was the wastegate at stock position:

Screen Shot 2017-03-10 at 09.40.01.pngScreen Shot 2017-03-10 at 09.40.01.png

i think ill give it 1.5/2 turns back :(

1 bar was fun :D:D:D: really need to get me an ESL hahah

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Yeah that's why I said to take note if the oe position of the adjuster .... unmapped over boost = nom nom pistons [emoji39] .

that first pic is the solinoid duty map and not the boost curve obviously ?

If adjusting the arm got rid of the rattle ?

I'd suggest getting another working actuator as your current one sounds worn /weak .

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Thing is, as your car has probably adjusted itself over a period of time to try and offset the weakening wastegate, tightening it up without resetting the ecu will probs put a lot of things out of sync, I would adjust the wastegate and reset then try each time you make an adjustment 

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2 hours ago, savage bulldogs said:

Yeah that's why I said to take note if the oe position of the adjuster .... unmapped over boost = nom nom pistons emoji39.png .

that first pic is the solinoid duty map and not the boost curve obviously ?

If adjusting the arm got rid of the rattle ?

I'd suggest getting another working actuator as your current one sounds worn /weak .

 

there is already some locktight on the original position :D.

the adjusting arm has gotten rid of the rattle off boost, but i still here a rattle when im driving, may need a new actuator :o idk, i need to be sure before forking out.

the first pic is engine load vs relative manifold pressure.

Ill try find a td04 acutator then :D 

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Dunno much about how the graphs are supposed to look but the things listed all seem to be to do with airflow /fueling.

Maybe check ....

Loom earth's and plugs .

Spark Plug colour /condition.

Intake air leaks .

Vacuum gauge check that the actuator is starting to open and reaching fully open at the correct pressure

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Loom and earth/Plugs all good.

Changed spark plugs, white in colour due to the injector cleaner i ran, other than that car running slightly rich!

Intake air leaks, car is idling at -0.69 to -0.7, so i think i have full vaccum and no air leaks, will go around with some brake clean or carb clean when i do a cold start to see just incase.

new actuator will be here tomorrow.

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right so i got the wastegate in and it made no difference, to be honest in the stock position it just rattles the flap at idle.

the manifold relative pressure will be all over the place.

-0.8, -0.6 , 0.2, 0.4 0.9 -0.8, -0.8, 0.9

this is all under WOT 

and respectively the boost solenoid cyclce will be

0% when i loose all my boost (-0.8) under WOT.

i cleaned my solenoid out, ill try it again with a stronger cleaner.

ill then proceed by checking all vac lines for any damage.

ill then get a vac hose from the turbo nipple to wastegate nipple and remove the pill, this in theory should give me 0.5 bar boost!

ill try to block off the vac lines with something too.

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  • 2 weeks later...

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