good bad boost fault

[mrt72]

evening folks,
been have a few problems as lately with the evo hitting the limiter when its booted and noticed yesterday that its started boosting to 1.4-1.5 bar instead of its usual standard 0.9.
any ideas guys? last car i had this trouble with was a golf gti and it blew the turbo shortly after.
i've not changed anything on the car to make it do this, its good cos of the extra boost but we all know its not good on a 4 engine.

 

[RsvRob]

Evo 4 as in the pic?

That will be your actuator f*cked if its still the std one fitted without the hat

Don't drive on boost while its knackered as you'll over boost and blow the engine. Chase up a new or used evo 8, 9 actuator with a hat on it

 

[mrt72]

nice one rob cheers.
that was my diagnosis too, but my lad said no you'd get no boost.
and he's the mechanic lol, daddy always knows best lol

 

[mrt72]

oh and yeah, the one in the pic

 

[fq-craigus]

just in case too check the pipework just to make sure a hose hasnt come off the actuator or off the turbo that would cause it to over boost too, just a tought

 

[sponners]

as Rob said, prolly the actuator seized and not opening wastegate

 

[RsvRob]

nice one rob cheers.
that was my diagnosis too, but my lad said no you'd get no boost.
and he's the mechanic lol, daddy always knows best lol

Yoda knows best

just in case too check the pipework just to make sure a hose hasnt come off the actuator or off the turbo that would cause it to over boost too, just a tought

Keep your nose out young padawin Yoda is working here :awesome:

 

[mrt72]

just had a quick look and all pipework is fine and the actuator is really easy to work.
so i take it the diaphram will have gone in it preventing from working.

 

[RsvRob]

Disconnect the pipe to turbo. Leave connected to the actuator and blow into it. You will not be able to blow through if the actuator diphram is working. If its easy to blow through then its f*cked

 

[B6lee]

nice one rob cheers.
that was my diagnosis too, but my lad said no you'd get no boost.
and he's the mechanic lol, daddy always knows best lol

just had a quick look and all pipework is fine and the actuator is really easy to work.
so i take it the diaphram will have gone in it preventing from working.

if the diaphragm has split then youll get no boost but if the actuator has seized then it will no open the wastegate which as a result the car will over boost. this is a common fault on early evos so as rob said get one for a later evo as they have the hat fitted which stops the shaft getting wet and rusting

 

[mrt72]

that'll be wedding anniversary present then lmao.

 

[sponners]

does as Rob said and see if you can blow into the actuator, if you can then the diaphragm is split (common fault) and will cause overboost.

 

[fq-craigus]

Yoda knows best



Keep your nose out young padawin Yoda is working here :awesome:

just a thought u never know, look at smaller probs first and all that lol

 

[Motointrest]

you want a evo8 one not a 9 one. the 9 one is a slightly different shape due to the slightly changed turbo design. I've not tried fitting one though so can't actually say it wont go on.

 

[foxy lady x]

just a thought u never know, look at smaller probs first and all that lol

that'll teach you for messing with the big eared green midget lol

 

[fq-craigus]

that'll teach you for messing with the big eared green midget lol

Haha lol boost probs I usually end up straight at robs I'm tryin to show I'm learning lolz ill make a master one day

 

[B6lee]

Haha lol boost probs I usually end up straight at robs I'm tryin to show I'm learning lolz ill make a master one day

Master baiter lol

 

[fq-craigus]

I'm a Master baiter lol

Too much info lee lol