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Running too much boost with stock boost setup. help!

Cake

By Cake,
in Engines & Forced Induction

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Cake Mentor

Cake

Posted
Posted

Only engine mods my car has is full exhaust, pod, and intercooler.

Ok just had full intercooler piping fitted with hybrid cooler. Also had split dump pipe fitted at the same time.

I don't have any aftermarket boost control, still running the stock setup. It holds 0.5bar below 4500rpm like it always did. But now instead of jumping to 0.6 bar once the revs are over 4500rpm like it used to, it's just rising up to 1 bar and possibly beyond, but i back off throttle once it reaches 1 bar because i don't want to damage the engine or turbo.

This is what i suspect is causing it...

The line from the wastegate actuator is now running right accross the engine bay and tapped into a line coming from the stock plenum. I am going to get a nipple welded into the intercooler piping to tap this line into tomorrow hopefully, instead of up at plenum.

Should i tap it into the intercooler pipe from turbo? or into the pipe from cooler to plenum? Do you think this could be the cause of the over boosting?

At first i thought it could be the wastegate flap being restricted or hitting the dump flange, but after sussing out the new vacuum line config, i'm thinking it's that.

here are some photos of previous setup

and photos after cooler install and lines changed

[pics]

cheers,

chris.

Jay95R33 Grand Master

Jay95R33

Posted
Posted

I think your on the mark Chris.

That new pipework for the wastegate hose is pretty long, so this may be why your boost is creeping up.

Also, if it's not the right type of hose, it can buldge under pressure too which won't help things.

One thing to try, and that's to unplug the factory solinoid (electrical plug), and see what that does. If it fixes the problem then you know it's a problem in the pipework from the factory solinoid - but I dought it'll be that.

The only other thing to try is to take the factory solinoid out of the circuit totally, and just run a pipe from the wastegate to the inlet.

J

RBVS Community Regular

RBVS

Posted
Posted

hi boo5t,

i can see in the old set up nothing was t'ed into the hose heading to actulartor.

in the new pic. new piping set up the hose heading to the actulator is T'd with the boost gage. this could act as a restrictor and lower pressure to the actulator making it swing the gate less than the old set up causing more boost.

try running a hose in a clean run from plenum to actulator.

Ting in to the pipe work should give the same affect as plenum.

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