G40 Problem, Serious lack of power? UPDATE WITH PICS/VIDEO

tandy · July 20, 2009, 04:58:07 PM

I lookd at the car on Sunday and its holdin bk like the chargers not bilding ne boost cud this be a blocked intercooler dosnt sound like its got a boost leak ?

PeteG40 · July 20, 2009, 05:25:37 PM

yeah pressurising the system to 1 bar would work.

Never heard of a blocked intercooler....

When was the charger serviced? what pulley is it on....

tandy · July 20, 2009, 05:38:43 PM

Its got a staderd pulley on it and don't think it was done that long a go

LeonL · July 20, 2009, 05:48:24 PM

Car is 100% standard...

Had a stage 2 rebuild by jabbasport in 2001 at around 51k miles, car is now on 88k miles.

However guy i purchased from said he gave it a "mini" charger service last year (1k miles ago). He has reciet for the parts used and also the parts he replaced.

PeteG40 · July 21, 2009, 08:03:20 AM

hmm - sounds like that should be ok....

hope you get it sorted

LeonL · July 21, 2009, 08:12:18 AM

Would it be a good idea to open the charger up my self and take a look to see if there is any damage then put it back together? Or would that only be a job for someone with experience?

PeteG40 · July 21, 2009, 08:13:06 AM

they aint too difficult, if you know what yr doing!

LeonL · July 21, 2009, 06:02:38 PM

I dont really know what im doing, all i'd want to do is open it up and have a lookie about to see if there is any obvious problems, worth it considering i have no supercharger experience?

PeteG40 · July 21, 2009, 06:04:36 PM

it all depends if you feel confident enough

LeonL · July 21, 2009, 08:53:59 PM

Car isnt working either way so nothing to lose, lol

Anyway update:

Checked the pipe that goes from charger to intercooler, its fine

Purchased a boost guage which i'm still trying to work out how i wire up

PeteG40 · July 21, 2009, 08:56:21 PM

t into the vacuum hose which goes from the top of the fuel pressure regulator to the one way valve/pipe that goes from the inlet manifold to the servo

DaBigGinger · July 21, 2009, 10:13:17 PM

Is the boost return valve closing properly when you put your foot to the floor on the accelerator? Some people have been known to tinker with the linkage meaning that the BRV won't close fully when you floor it.

Also, if you let the car warm up, there is a blue plug to the right hand side of the exhaust manifold (looking at it from the front). When you remove this, do the revs drop or stay the same?

I'm 90% sure your problems caused by lack of boost, though.

LeonL · July 22, 2009, 07:41:37 PM

Hi,

Thanks for all the advice guys.

Major update now:

-Boost guage has been fitted.
-Checked to see if BRV was closing.

Firstly here is the BRV when no pressure is on the accelerator pedal(foot not on pedal)

Now here is the BRV when full pressure is placed onto accelerator pedal(pedal right down)

Here is a youtube video showing the movement of the BRV from no foot on pedal to foot all the way down
http://www.youtube.com/watch?v=irPagQi64n4

So...What does this show/prove/conclude etc...?

Also here is what the boost gauge shows while the car is in idle

Is this right?

Thanks

g40chris · July 22, 2009, 07:51:49 PM

the butterfly should be completely closed when foot is on floor. check to make sure the black plastic clip is not fouling anything. seen this before and it stops it from fully closing. you wont be using all the boost this way. i think that if you sort this you will have g40 power again

LeonL · July 22, 2009, 07:58:48 PM

Well first thing i noticed when i drove my G40 is that the accelrator pedal didnt have much travel as compossed to my Polo GT and other cars i have driven in my time...Mentioned it to the guy when i was test driving it and he said every car is different which i know is true but something fishy is going on here

Should the butterfly be angled like this "I" or like this "/" to be fully closed?

What black plastic clip are you talking about Chris?