wastegate

[sawood12]

The surge/judder sounds a bit ominous to me. Not in a serious way, but in a way that sounds like a tricky problem to track down - it could be fuel or electrical. It certainly doesn't sound like a wastegate issue as a leaky premature wastegate will just increase lag and in extreme cases you might struggle to achive full boost. However surge/juddering is not a wastegate symptom i've heard of before. I think what Paul has said makes sense in that you should give the engine a damn good look over to look for boost leaks, any electrical problems - for example are your HT leads the originals?

If your wastegate is the cars original it will almost certainly be way past its best.

 

[swright]

The last owner replaced the leads with some splitfire things not long before i bought it.(trying to sort the problem no doubt,LOL) but the coil lead was wrong so is still the original. One thing i have noticed is that a few of the leads are touching the metal intercooler pipe. Could they be arching up onto it? When its on full boost it is fabulous, its just before it boosts that it seems to judder twice then its off like a rocket. but then there's the over fueling issue which could be the problem also. I'm now thinking the chips need removing like Fen says as it might all be down to them causing the problem. The trouble is, i don't have the originals to put back in!!!!

I need to book it in to see my mechanic basically and hope for the best!!


Stu

 

[swright]

just had a thought. I noticed a slight leak from the manifold the other day!!!!!!!!!!!!! Im so thick ffs!! That would surly cause the problem im having by causing not enough pressure to build up in the system !!!

 

[Fen]

You can get stock chips relatively easily. If nobody on here has a spare set they want to offer then speak to Rick as I think he has some.

 

[swright]

Cheers for the info Fen[8D]

Do you thing the manifold blow would cause the judder when the turbo kicks in?

Stu

 

[Fen]

I would doubt it. I really don't know what to suggest on the surging. My best guess is that it takes a little while for the turbo to start making enough boost to burn the excess fuel efficiently so when you open the throttle you effectively partially "flood" the engine with fuel. The manifold leak would exacerbate that issue through making it harder to build boost though I guess.

In terms of arcing leads, open the bonnet in the dark with the engine running and you'll be able to see if there is a problem.

 

[swright]

Another question. When i fitted the boost enhancer i noticed that the pipe from the banjo bolt on the intercooler pipe had a little metal insert that was loose inside the pipe(IE i could pop it out with a screwdriver). It has a little hole in the middle of it so basically it reduces the air flow. What is the function of this insert and is it necessary?

Stu

 

[Fen]

Sounds like part of your "chip" kit. It will be a restrictor intended to mask the actual boost pressure from the boost control system so the car can run more boost

It sounds like the kit is pretty crude, which isn't to say it wouldn't have worked once up on a time, but from what you describe it doesn't work any more and I doubt it was ever very good. I suspect you have found the rest of it though - it will be a chip to increase fuelling and a restrictor to fool the car into running more boost.

 

[swright]

Excellent, many thanks Fen[8D]

Il be taking it out along with the chip as soon as i can. Once i get it all ship shape and air tight il be buying a pucker chip upgrade and a duel port wastegate as well.

Dont ya just love sorting out other peoples feck ups!!! LOL!