www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You




Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI Power Enhancements

TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

Reply
 
Thread Tools
Old March 24th, 2011, 17:03   #1
Adamski
Member
 
Adamski's Avatar
 
Join Date: Apr 2010
Location: birmingham, UK
TDI(s): Audi A3
Default VNT1749 laggy!? advise!? vain setup???

Hi guys, my mechanic has just been and fitted my second hand 1749, he said the car was nice and quick before the turbo change. due to the old turbo oil seals going i wanted to upgrade.
Any way he fitted it up tonight but says it goes very well but its VERY laggy says it doesnt pull hard till 3000RPM then pulls like a train...
surely that isnt right? Could the turbo be bit screwed!?
any help appriciated
Ad

EDIT:- done some searching and it could be the vain setup?? how do you set them up or whatever it is my mechanic has never done this before!?
__________________

Last edited by Adamski; March 24th, 2011 at 19:47.
Adamski is offline   Reply With Quote
Old March 24th, 2011, 17:33   #2
K.I.T.T.
Veteran Member
 
K.I.T.T.'s Avatar
 
Join Date: Aug 2006
Location: Europe
TDI(s): N/A
Default

Is the actuator / stop screw adjusted properly?

Ash
__________________
PD injector differences (click)
K.I.T.T. is offline   Reply With Quote
Old March 24th, 2011, 17:46   #3
Adamski
Member
 
Adamski's Avatar
 
Join Date: Apr 2010
Location: birmingham, UK
TDI(s): Audi A3
Default

what do you mean!? does it need adjusting?
__________________
Adamski is offline   Reply With Quote
Old March 24th, 2011, 21:59   #4
NewTdi
Veteran Member
 
Join Date: Jan 2004
Location: planet Earth
Fuel Economy: 52/47/39
Default

My vnt15 used to boost a little before my 1749 does; like yours, once i reach 3000rpm the car really takes off. A liitle adjustment to our tune could help boostba little sooner!
NewTdi is offline   Reply With Quote
Old March 25th, 2011, 10:20   #5
Piranha
Veteran Member
 
Piranha's Avatar
 
Join Date: Sep 2003
Location: Malta (Europe)
Fuel Economy: Managed 4.5L/100km once, but got bored driving so slow!!
Default

IS the turbo new or second hand???

I had that issue when I installed my vnt17 (ebay.de).

Turbo felt real laggy.

Blew it's seals 5 miles down the road and nearly hydrolocked my engine.

If it's second hand get it rebuilt!!!!!
__________________
1985 Golf II GTI 8V.. The project
2000 Golf IV AHF tdi.. The toy
2010 Golf VI CBAB 2.0 Tdi.. The wife's
2011 A1 1.6 CAYC 1.6 TDI.. The daily.
+ The Bikes!
Piranha is offline   Reply With Quote
Old March 25th, 2011, 10:47   #6
Adamski
Member
 
Adamski's Avatar
 
Join Date: Apr 2010
Location: birmingham, UK
TDI(s): Audi A3
Default

it is second hand yes, however i have done some research and i think perhaps the vains are sticking, my mate says its got better today slightly as he took it for MOT, it passed and he said he hasnt got time right now to remove the turbo and clean it all up so he's gonna gimme a oil change anyway and try and squirt some wd40 on the rod and se if it may help then he'll bring it back to me to use for 2 weeks then if still playing up we will remove it and clean it up , he's also going to give the actuator a few turns to try and make it pick up a bit better
__________________
Adamski is offline   Reply With Quote
Old March 25th, 2011, 11:21   #7
Nash_TDI
Veteran Member -TDIClub Enthusiast
 
Nash_TDI's Avatar
 
Join Date: Sep 2002
Location: Louisville, ky
Fuel Economy: 63.25mpg max
Default

You need to check the actuator adjustment not just give it a few turns. You need to see at what pressure it starts moving and at what pressure it hits the stop.
__________________
2.0 ALH, GTB2260, 12mm, etc, etc.....
www.nashimporters.com http://louisvillevw.org/
TDI Repair Available, TBs, Clutches, Manual Swaps, BSM, etc..
PD Cam tools, BSM tool, VE & PD TB tool rental available.
Nash_TDI is offline   Reply With Quote
Old March 25th, 2011, 11:39   #8
JFettig
 
JFettig's Avatar
 
Join Date: Aug 2010
Location: Blaine, MN
Default

Don't just start adjusting the actuator and stop screw, especially don't even touch the stop screw!

Measure the vacuum that it takes to lift the actuator off, it should be 3-5in-Hg, it should also stop at the stop screw between 18 and 20in-Hg. Verify its function and its numbers before making any adjustments!

Jon
__________________
Minnesota Malone Tuning dealer
1998 B5 Passat TDI Compound Turbos
2009 JSW Stage 3 196whp so far
DIY injector calibration http://forums.tdiclub.com/showthread.php?t=383324
JFettig is offline   Reply With Quote
Old March 25th, 2011, 17:35   #9
Adamski
Member
 
Adamski's Avatar
 
Join Date: Apr 2010
Location: birmingham, UK
TDI(s): Audi A3
Default

whats hg!? do i need to buy a proper vacuum pump?

ok well i have the car back tonight and it basically doesnt hardly boost till 3k then as my mate said it builds up then and comes on very strong, you can hardly hear the turbo whistle, plus he said it was going into limp mode once or twice...

Which after driving it leads me to believe the vains are not workng properly its probably my own fault the turbo has been sat in a box for near a year and came off a written off PD150 so the carbon build up and fact its not been used would indicate that its sticking which unfortunatly means removing it again to clean it up
__________________
Adamski is offline   Reply With Quote
Old March 25th, 2011, 17:50   #10
NewTdi
Veteran Member
 
Join Date: Jan 2004
Location: planet Earth
Fuel Economy: 52/47/39
Default

try using the oven cleaner method to clean the turbo, there is a thread somewhere

http://forums.tdiclub.com/showthread.php?t=246287

Last edited by NewTdi; March 25th, 2011 at 17:55.
NewTdi is offline   Reply With Quote
Old March 25th, 2011, 20:53   #11
JFettig
 
JFettig's Avatar
 
Join Date: Aug 2010
Location: Blaine, MN
Default

inches of mercury, I'm sure you're use to using different units, its one of the many 29in-hg is 1 atmosphere.

A $30(usd) hand held vacuum pump will do the trick, odds are that you know someone who has one - like the mechanic working on it.

Jon
__________________
Minnesota Malone Tuning dealer
1998 B5 Passat TDI Compound Turbos
2009 JSW Stage 3 196whp so far
DIY injector calibration http://forums.tdiclub.com/showthread.php?t=383324
JFettig is offline   Reply With Quote
Old March 26th, 2011, 20:22   #12
85_305
Banned
 
Join Date: Jun 2010
Location: Buffalo NY/FT Bragg, NC
Default

Find somebody with a mityvac... your vnt rod should begin cracking at 4-5hg and starting to close NO SOONER than 18hg. I'd be willing to be your VNT rod didn't come tuned correctly and it just needs to be set.
85_305 is offline   Reply With Quote
Old March 27th, 2011, 07:05   #13
JFettig
 
JFettig's Avatar
 
Join Date: Aug 2010
Location: Blaine, MN
Default

Quote:
Originally Posted by 85_305 View Post
Find somebody with a mityvac... your vnt rod should begin cracking at 4-5hg and starting to close NO SOONER than 18hg. I'd be willing to be your VNT rod didn't come tuned correctly and it just needs to be set.

I just got my jetta with 184k on it running, before putting the turbo back in I checked the VNT rod, it cracked at about 2inHg but I figured, 184k miles, I'll leave it, test it then adjust it. Boost spike is obnoxious on this and will bring it up to ~4inHg.

My GT1749VA for my Passat was also cracking around 1.5inHg from the factory, that thing spooled like crazy but spiked pretty good too. Brought that up to 4inHg and adjusted the tune and it spools pretty awesome still.

Jon
__________________
Minnesota Malone Tuning dealer
1998 B5 Passat TDI Compound Turbos
2009 JSW Stage 3 196whp so far
DIY injector calibration http://forums.tdiclub.com/showthread.php?t=383324
JFettig is offline   Reply With Quote
Old March 27th, 2011, 08:30   #14
85_305
Banned
 
Join Date: Jun 2010
Location: Buffalo NY/FT Bragg, NC
Default

If your rod starts closing before 18hg, it's going to have disgusting spikes. It
s not so much when it opens, but moreseo when it starts closing.
85_305 is offline   Reply With Quote
Old March 29th, 2011, 13:48   #15
Adamski
Member
 
Adamski's Avatar
 
Join Date: Apr 2010
Location: birmingham, UK
TDI(s): Audi A3
Default

well there is no boost what so ever until you hit 3k then it all starts coming in but will only boost 1.2 bar held. on the std vnt15 it was boosting perfect and peaking 1.7bar holding 1.3-1.4. We have only changed the turbo nothing else.

the car will also go into limp mode after 5 mins of driving. Not sure if the rod is set right but i have a feeling the vains are sticking...
__________________
Adamski is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
advise please alexpart VW MKV-A5 Golf/Jettas 2 July 16th, 2010 14:28
advise? scubagli TDI Power Enhancements 6 June 29th, 2009 21:42
Extremely laggy forum. What is wrong? nicklockard TDIClub and TDIClub Forum News, Issues, Problems and Suggestions 7 July 13th, 2005 20:28
TDI Driving/Performance Laggy Starfighter_org VW MKIV-A4 TDIs (VE and PD) 3 September 4th, 2003 12:13
Please advise me tdihu TDI Cars for Sale/Wanted 4 June 6th, 2003 14:31


All times are GMT -7. The time now is 07:52.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.18810 seconds with 10 queries
[Output: 128.01 Kb. compressed to 106.24 Kb. by saving 21.77 Kb. (17.01%)]