[Odan.be]

My Oem turbos are lazy spooling, but still hitting target PSI ( 18 psi)

I changed vac lines, 2 new boost solenoids. I pressurized the charge system and leaktested with soap. No leaks.
My vacuumpump is still pulling 27 inch HG. And my turbos are still slow spooling. Only 5 psi @ 2500 rpm. Wilst de waste gates are 95% closed.

I friend of mine said that there could be a chance that my forge FMIC is bad flowing ( this one : http://www.forgemotorsport.co.uk/Upr...uct--1031.html )

Could this be the case ?

Also my WG are ratteling really bad, but if they would't seal anymore i wouldn't hit target boost , right ?


Thx !

[ferocity02]

I doubt its the intercooler, pretty hard to screw that up. I'd check the wastegate position vs. vacuum, perhaps they are not closing as much as they should despite 95% WGDC.

[Odan.be]

How can i check that ?
There is one more thing i am going to try tomorow.
I am going to put the vacuum right on the WG actuator, bypassing the solenoids, and DME WG control
Normaly they should be 100% closed, and the spool should be immediatly.

[csu87]

You can have a crack in the intercooler causing a boost leak. Have you done a boost leak test yet?

[stanlalee]

Definitely not the intercooler (design). Definitely could be a leak/hole (pressure test). Having had VWs for many years I can tell you even when Forge doesn't make the best design or best performing unit one thing you can count on is testing/development. I can virtually guarantee they've tried multiple cores and and end tank testing to ensure its not unacceptably poor flowing. Anyhow too large volume + too free flowing = pressure drop/lagginess. Its a 5" intercooler and even 7" intercoolers don't have that problem.

[Luckystrike24]

the wastegate rattle could be atleast a portion of the slow spool and slow throttle response. This coming from my client that just had them done.

[Odan.be]

Well, I did a test to rule out The vacuumlines and DME .
I applied Vacuum strait on the WG actuator. My vacuum pumps constant sits at 27 in HG vacuum. The actuator needs about 7 in HG to be fully closed.
So both waste gates had constantly 27 in HG .. meaning they should be a totally 100% closed...

result is. Still a slow boost an hitting 19 psi lol .

http://datazap.me/u/odanbe/bypassing...og=0&data=4-22

[wgknestrick]

Most likely boost leak in IC piping....check all couplers. Does your piping have the textured powder coating on it? That stuff is notoriously tough to seal against.

[Odan.be]

I noticed around 5 - 6 PSI it starts leaking around the oil filler cap I'll replace the cap and gasket?
Could this be it ?

[Odan.be]

nvm i forgot to cap te PCV valve

Went to 9 - 10 psi until front and back turbo inlet started hissing... but no noticable leaks in the charge side

[techwhiz]

Air filter?

[Mike@N54Tuning.com]

Originally Posted by wgknestrick

Most likely boost leak in IC piping....check all couplers. Does your piping have the textured powder coating on it? That stuff is notoriously tough to seal against.

Thats the most common major boost leak location.

Mike

[Odan.be]

I have a forge intercooler wicht still uses c clips couplers like the oem one ...

[ferocity02]

Originally Posted by Odan.be

The actuator needs about 7 in HG to be fully closed.

I could be wrong, but is this what it should be? I thought they were to be fully closed at a much higher vacuum, like 26 inHg? I'm trying to find where i read that but can't at the moment.

Did you adjust your wastegate actuator rods? Did you recently have the turbos replaced at a dealer?

[Odan.be]

I applied vacuum straight from the vacuumpump (29 in hg) onto the actuators. I watched them move. After the vacuummeter passed 7 in hg they where fully closed. After 10 in hg there was no movement any more.

I did not replace turbos nor did i adjust the actuator rods i am trying to rule everything out, before i replace the turbos. I might try to adjust the rear actuator... i don't think i can get to the front...

[Odan.be]

Ok ,

I think i found the problem.
I while ago (before i started logging) i asked my technician to tighten the actuators from the waste gates, because the was some ratteling, Also I asked to remove the wg rattlefix.

Because i was troubleshooting everything, and and some part i put the engine in idle and applied the vacuum directly on the waste gates i could verify the movement of the actuators.

Now i rember my technician saying " I turned them as fa as i could , but there is not much thread left" .
I jumped up from the couch, Opened the hood, and looked at the rear WG actuator ... And indeed , the rod was at his maximum length! The technician "tightened" it the wrong way around. As the actuator arm becomes longer. the WG is pushed more and more open. Even wen the Solenoid booster tells it to close a 100% it will stay open.

So I took a wrench 10 mm and dremeled me a special 4 mm tool to turn the rod. And gave it 4 turns inward...

AND HALELUYA !!! Cars spooled faster. Building boost alot faster. So problem is halve solved. Why halve... because i can't reach the front turbo actuator, but i already called my technician to solve that too !
Now my boost curve looks already a bit better... and once the front is adjusted... it should all be working as intended !

On the bright side. I got new vac lines, 2 new boost solenoids, cleaned the intercooler, cleaned the couplers and i know my system is leak free ! And i don't have to order new snails !

http://datazap.me/u/odanbe/tightened...og=0&data=4-22

[Jeff@TopGearSolutions]

Originally Posted by Odan.be

Ok ,

I think i found the problem.
I while ago (before i started logging) i asked my technician to tighten the actuators from the waste gates, because the was some ratteling, Also I asked to remove the wg rattlefix.

Because i was troubleshooting everything, and and some part i put the engine in idle and applied the vacuum directly on the waste gates i could verify the movement of the actuators.

Now i rember my technician saying " I turned them as fa as i could , but there is not much thread left" .
I jumped up from the couch, Opened the hood, and looked at the rear WG actuator ... And indeed , the rod was at his maximum length! The technician "tightened" it the wrong way around. As the actuator arm becomes longer. the WG is pushed more and more open. Even wen the Solenoid booster tells it to close a 100% it will stay open.

So I took a wrench 10 mm and dremeled me a special 4 mm tool to turn the rod. And gave it 4 turns inward...

AND HALELUYA !!! Cars spooled faster. Building boost alot faster. So problem is halve solved. Why halve... because i can't reach the front turbo actuator, but i already called my technician to solve that too !
Now my boost curve looks already a bit better... and once the front is adjusted... it should all be working as intended !

On the bright side. I got new vac lines, 2 new boost solenoids, cleaned the intercooler, cleaned the couplers and i know my system is leak free ! And i don't have to order new snails !

http://datazap.me/u/odanbe/tightened...og=0&data=4-22

It's usually something simple.

[ferocity02]

You're welcome