Bad lag with new head

TNTKNC

Veteran Member
Joined
Dec 17, 2002
Location
Canton GA
TDI
2003 Jetta
Just had my 02 golf running great, malone stage 2 stage 2 cam. Got a check engine light for glow plug. Number 3 stuck in the head will not come out with what i have for tools. Have a new head so off it comes to put the new one on. Immediately notice it doesn't run very good on low end. Adjusted the actuator on the turbo because boost wasnt coming on till 3k rpm. I now have it boosting around 2 to 2200 rpm. However i have seriously bad lag between every shift no matter the rpm range and almost dangerous lag coming off a stop.
Any ideas or help is appreciated.
Thanks
 
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UhOh

Top Post Dawg
Joined
Dec 24, 2014
Location
PNW
TDI
2000 & 2003 Golf GLS (2005 Mercedes E320 CDI)
What's your vacuum readings like? I'd double-check hoses.

But, why all of a sudden did the actuator need adjusting?
 

TNTKNC

Veteran Member
Joined
Dec 17, 2002
Location
Canton GA
TDI
2003 Jetta
Haven't checked the vacuum since it still does boost its just not the same as it was before the swap. I have replaced lots of heads and never had this issue before. Never had to adjust the actuator, never had the performance suffer like this. So I'm kinda stumped as to what is going on.
 

Nevada_TDI

Top Post Dawg
Joined
Aug 17, 2008
Location
Reno, sort of...
TDI
2001 Jetta TDI
I would be 100% sure you haven't lost you minimum 22" going to your N75 valve. Just because you still boost doesn't mean everything is okay. If everything was still okay, you wouldn't have posted, would you?
 

Franko6

Vendor , w/Business number
Joined
May 7, 2005
Location
Sw Missouri
TDI
Jetta, 99, Silver`
There is an actuator for one particular turbo that has a 'traded' actuator, and not installed at the factory, no paint. We got one and expecting it to be right, were surprised when the car became more and more sluggish. We found the turbo actuator's lock nut for the turnbuckle had not been tightened and the adjustment was loosening up. If that isn't irritating... So, we set it and got the number to 18 inches, as it should be when the actuator pulls the VNT arm against the stop nut. Boost returned as it was supposed to be.

I should not have to be doing adjustments for what is declared a brand-new factory turbo.
 
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TNTKNC

Veteran Member
Joined
Dec 17, 2002
Location
Canton GA
TDI
2003 Jetta
Ok. So finally got around to checking vacuum. I figured it wasn't the issue but gotta check. So right out of the N75 to turbo running group 11, its pulling 23 inHg vacuum. Actuator moves freely and hits stop at 18inHg and holds position just fine. So I'm still chasing whatever issue is going on with this head. Like I said before I had just put this turbo on from a parts car and turbo isn't that old. Still is in very good condition, and car was running beautiful with little to no lag before swapping the head. I hate to pull the head again but may not have a choice. Would adjusting the actuator further possibly help with the lag?
Thanks
 

TNTKNC

Veteran Member
Joined
Dec 17, 2002
Location
Canton GA
TDI
2003 Jetta
So I shortened the actuator rod on the turbo even more and it seems a little better but not quite right still. I guess my question is how much can I shorten it or does it matter. I've lost count how many turns I've shortened it. But its a lot. Doesn't seem like it should be that far off. I've never had one do this before.
 

Seatman

Top Post Dawg
Joined
Apr 23, 2010
Location
Scotland
TDI
2014 Skoda rapid elegance 1.6 cr tdi
Did you use the same thickness head gasket? I'm asking in case it could be lower compression due to a thicker gasket.
 

meangreen

Veteran Member
Joined
Oct 2, 2006
Location
Houston BC
TDI
2001 Jetta
Just a silly question did you check your injection pump timing after replacing head. And did vacuum hose on the n75 vent hose go to the air filter , not that it is kinked which will make it sluggish
 

TNTKNC

Veteran Member
Joined
Dec 17, 2002
Location
Canton GA
TDI
2003 Jetta
Yes IP timing is set correctly. Also vacuum lines are correct and i don't see any kinks. I'll keep looking to see if i can find anything.
 

jasonTDI

TDI GURU Vendor , w/Business number
Joined
Apr 26, 2001
Location
Oregon, WI
TDI
04', 05', 06' TDI's. Audi SQ5, RAM Rebel
There is an actuator for one particular turbo that has a 'traded' actuator, and not installed at the factory, no paint. We got one and expecting it to be right, were surprised when the car became more and more sluggish. We found the turbo actuator's lock nut for the turnbuckle had not been tightened and the adjustment was loosening up. If that isn't irritating... So, we set it and got the number to 18 inches, as it should be when the actuator pulls the VNT arm against the stop nut. Boost returned as it was supposed to be.

I should not have to be doing adjustments for what is declared a brand-new factory turbo.

Experienced exactly this. Annoying to say the least.
 

TNTKNC

Veteran Member
Joined
Dec 17, 2002
Location
Canton GA
TDI
2003 Jetta
23 inHg of vacuum isn't enough? I will give it a try as soon as I can get a chance to get back to it.
Thanks
 

Franko6

Vendor , w/Business number
Joined
May 7, 2005
Location
Sw Missouri
TDI
Jetta, 99, Silver`
23 is a bit low. Check vacuum for the line going to the turbo actuator. It should be 18-20.
The vacuum line in should be 27-28. Check for cracked hose to brake booster hose and loose swedge for vacuum nipple in the Vacuum pump. If you wiggle the vacuum pump nipple and it shows a big drop in vacuum, either replace the V.P. or fix it.

All that could definitely cause delayed boost.
 

TNTKNC

Veteran Member
Joined
Dec 17, 2002
Location
Canton GA
TDI
2003 Jetta
Thanks I will check. Been in the hospital with The wife this week, so haven't had a chance to look at anything. I will update when I can get her free.
Appreciate the help.
Troy
 
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