Boost problems (trouble shooting and simplification)

[allstaruk]

I haven\'t seen you guide, if you\'d like to post a link that would be awesome, if anyone is interested I\'ll do a write up of how it goes too

[Bobbit]

Here you go bud: clicky
If you have any Q\'s or need any advice let me know bud.

[allstaruk]

Right, all is not well, and I need help now.

This is what I have done and then I will explain the problem and pray someone can help.

I have done the turbo simplification, the only part I havent done is put resistors in as I don\'t have any but seeing as I\'m running a power FC it shouldn\'t be a problem. I have already removed the butterlflys from the UIM and stuff, I have moved the cooland pipe and wired open the throttle body.

Now the problem is I put it all back together, put the battery back in and the car fired up, when I tap the throttle the car dies for a 2nd the catches, but if I put my foot flat to the floor it revs to 4k and stops, and if I hold my foot down it revs to 4 dies the cuts out drops to 3k revs to 4k drops back to 3k and back and forth.

Any one got any ideas i\'ve getting really sick of this the car has just been a paper weight for 6 months I haven\'t driven it.

And before any one suggests one of the tunners I can\'t afford it at the moment.

Alan

[allstaruk]

Oh and I forgot to mention that the heat light is permenantly on now too

[marco]

check you havent missed a connection- TPS?

[allstaruk]

Bugger, I don\'t remember pluggig that in, Be right back

[nikp]

Are you running the power fc? If so, the heat light indicates an issues with a sensor or switch. You can check which one on the switch check screen under etc.

[nikp]

check the TPS is within the right limits too (when the engine is hot)

[allstaruk]

I forgot to plug the TPS in, lol.

Plugged it in, key in and it fired up purfectly, and I\'m getting boost on both turbo\'s :-).

For the first time in a year the car now boost on both turbo\'s and is driveable, is feels pretty quick, well a lot quicker than my s3 but I still not think its as quick as it should be for the mods I have done.

A

[JohnP]

i\'ve not read everything in this thread, but it sounds exactly like what i had going on with mine.
 
sounds like a leaky pressure chamber or vacuum chamber to me.
 
check the vacuum hoses around the black plastic pressure chamber on top of the engine next to the strut brace.  I removed my pressure chamber (2 bolts) only to find underneath a large greeny coloured one-way valve had split. £10 fix.
 
however, after i fitted, i found the pipes continued to blow off. jubilee them up, but not over tight, else you\'ll snap the one-way valve.
 
usually find the symtons of this problem are solid boost upto 5k, then a decrease in boost after this, or no boost at all.
 
what to check:
 
the one way valve i had trouble with:
 

 
where to find it:

 

 
thats what i found with mine anyway

[nikp]

i\'ve not read everything in this thread, but it sounds exactly like what i had going on with mine.

I\'d read the post above yours at the very least then! Cos he solved the issue by plugging the TPS socket into the sensor.

[JohnP]

just did... *sigh*
 
*hopes someone else with boost trouble finds my waste of time useful*

[RexKwonDo]

john that sounds exactly the problem with my car... i\'m checking when i get home! non-sequential may be postponed!

[JohnP]

not the one-way valve u need to check is the one out-of-focus in the pic.  It has a small hard vacuum pipe coming from it, that connects to the plastic pressure chamber.
 
hope it solves your prob