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Boost lose #1633898
14/07/2019 16:23
14/07/2019 16:23
Joined: May 2018
Posts: 113
born in Italy I live in German...
carmine Offline OP
On a journey
carmine  Offline OP
On a journey

Joined: May 2018
Posts: 113
born in Italy I live in German...
Hello.
I wanted to ask, where to look for a possible pressure loss.
Let me explain, I feel that the car does not have the usual thrust of all time, I felt this feeling a few months ago then I changed the intercooler with a bit larger than the original, now excluding all the line that goes from the turbo to the black tube before of the throttle body where I could look for the defect?
I have a boost tool in the car and from a standstill from a vacuum of -7 and by accelerating I arrive quietly at 1 bar.
Thank you.

Re: Boost lose [Re: carmine] #1633920
15/07/2019 12:17
15/07/2019 12:17
Joined: Sep 2006
Posts: 14,915
FCSS 01684 593187
Countrycruising Offline
Club Rep Europe, member 914
Countrycruising  Offline
Club Rep Europe, member 914
I AM a Coop

Joined: Sep 2006
Posts: 14,915
FCSS 01684 593187
When you say arrive quietly at 1 bar I assume that means it builds slowly?

Re: Boost lose [Re: carmine] #1633933
15/07/2019 19:19
15/07/2019 19:19
Joined: May 2018
Posts: 113
born in Italy I live in German...
carmine Offline OP
On a journey
carmine  Offline OP
On a journey

Joined: May 2018
Posts: 113
born in Italy I live in German...
Yes exactly.
It reaches 1 bar a little slowly.
You might think that the problem is the biggest new intercooler, but the problem was already there for a few months before the new intercooler.
I know that having an original turbine is not too much to expect but first it had its boost a little more violent.click to enlarge

Re: Boost lose [Re: carmine] #1634138
22/07/2019 20:48
22/07/2019 20:48
Joined: May 2018
Posts: 113
born in Italy I live in German...
carmine Offline OP
On a journey
carmine  Offline OP
On a journey

Joined: May 2018
Posts: 113
born in Italy I live in German...
1 question.
My boost pressure gauge measures a pressure of 1 bar or a little more, about 1.2. Immediately after it goes down, because the wastegate opens or the valve pop off. And everything normal or not?
It arrives at 1 bar and goes down even if we are still only at 4200 rpm with the same gear.
The boost is very fast and short, it starts to rise at around 3100 rpm and finish at 4200.
Please any suggestions?
I'm a little disoriented.
Did I hear it could be a pop off problem or a wastegate or pierburg?
Thank you.

Re: Boost lose [Re: carmine] #1634221
26/07/2019 21:35
26/07/2019 21:35
Joined: May 2018
Posts: 113
born in Italy I live in German...
carmine Offline OP
On a journey
carmine  Offline OP
On a journey

Joined: May 2018
Posts: 113
born in Italy I live in German...
Today I cleaned the EVB valve and the piping is checked as far as I could and seems to have no leaks.
Unfortunately I could not try the coupe on the road.
Is there any product that sprayed near you has tubes causing engine acceleration understanding if there is leakage?

Re: Boost lose [Re: carmine] #1634222
26/07/2019 21:37
26/07/2019 21:37
Joined: May 2018
Posts: 113
born in Italy I live in German...
carmine Offline OP
On a journey
carmine  Offline OP
On a journey

Joined: May 2018
Posts: 113
born in Italy I live in German...
Would you advise me to test it with a manual booster controller?

Re: Boost lose [Re: carmine] #1634271
29/07/2019 14:01
29/07/2019 14:01
Joined: Sep 2007
Posts: 594
Freedom
Master_Mariner Offline
Club member 583
Master_Mariner  Offline
Club member 583
Enjoying the ride

Joined: Sep 2007
Posts: 594
Freedom
You need to vacuum test the pipes really - to see if you have a pressure leak -I think that is what you ask)

You can spray soapy liquid to see if there are any leaks - but its hard to see (almost impossible) and vacuum is much better.

Are you still using the original plastic dump valve? They wear in the end and need replacement.

But if your blowing pipes off- its due too much pressure. Unless they have not been fitted correctly.

regards

MM

Re: Boost lose [Re: carmine] #1634297
29/07/2019 22:51
29/07/2019 22:51
Joined: May 2018
Posts: 113
born in Italy I live in German...
carmine Offline OP
On a journey
carmine  Offline OP
On a journey

Joined: May 2018
Posts: 113
born in Italy I live in German...
Hello.
How can I make a vacuum check?
I have mounted a pressure gauge to measure the boost, at minimum I always have a vacuum of - 7 / -8.
I think the tool is reliable, it's an HP raid.
The exhaust valve is not original, it is the one in metal a little bigger, found it already in the car when I bought it.
The piping is new, starting from the turbo up to the throttle body including the intercooler.
I installed them, I checked several times but I'm not sure ....
Give me some advice or I just have to find a professional workshop.
This is not easy here.

Re: Boost lose [Re: carmine] #1634301
30/07/2019 07:30
30/07/2019 07:30
Joined: Dec 2005
Posts: 7,286
Lightwater, Surrey, UK
DaveG Offline
Club Member 311
DaveG  Offline
Club Member 311
Forum is my life

Joined: Dec 2005
Posts: 7,286
Lightwater, Surrey, UK
Instead of a vacuum check, how about a boost/pressure check? I have recently done this on my 2017 Fiat 124 Spider and all that was required was to remove the inlet hose to the turbo and blank off the vapour recirculation hoses that allow boost pressure to leak back into the inlet piping [Edit] and remove the oil filler cap to avoid pressurising the crankcase. You'll need to make or buy an adaptor that fits over the turbo inlet and allows you to pressure up the inlet system from the turbo onwards using a foot pump or compressor. In the case of the Spider, the OE intercooler inlet/outlet elbows are a rubbish design with an O-ring "seal" that starts leaking at 1.3 bar, you could hear the air escaping. With a new intercooler and hoses fitted I was able to pressure up the system until various hoses started leaking or popping off (rather a loud bang) so that I could see what action was needed (added a "lip" to both ends of a new pipe I had to use to modify the supplied hoses which were designed for LHD instead of RHD). On my Porto 20vt I added a second hose clip on one of the intercooler hoses to stop it popping off.

I've not tried the same pressure test on a Coupe, but it should work the same, you just need to make/buy the adaptor and have a source or compressed air (easier with a small compressor) - and be able to measure the pressure of course (so that you don't go too high with the testing)

Last edited by DaveG; 30/07/2019 12:11. Reason: Remove oil filler cap also

1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake

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