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

Order your TDIClub merchandise and help support TDIClub


Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI 101

TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

Reply
 
Thread Tools
Old February 12th, 2005, 08:16   #1
Joshinthecity
Veteran Member
 
Joshinthecity's Avatar
 
Join Date: Dec 2004
Default flexing turbo vanes

Hi guys,
Just wondering if 3,000rpm and a heavy foot would be enough to keep the vanes flexed ? Seems to me that there is not a lot to be gained by going further as a 3k shift places me right on the torque curve for my Golf V 1.9 6-speed manual. After that, it's just noise.
Thoughts?

Josh.
Joshinthecity is offline   Reply With Quote
Old February 12th, 2005, 08:36   #2
cage
Veteran Member
 
Join Date: Mar 1999
Location: lakewood, ohio
Default Re: flexing turbo vanes

Shouldn't be just noise above 3,000. My '98 tdi gets a good kick @2,300 and pulls great to just over 4,000 then it falls off. You might have a MAF issue if you lose power @ 3,000. People also seem to confuse the torque peak at 1,900 rpm with power peak. Max power is @ around 4,200 rpm. Your car should pull wonerfully up to that point. The reason you want a the torque to come on at a low rpm is that it gives you better pull up to the max power. It doesn't mean that you drive at 1,900rpm. As far as your turbo question goes. Yeah, heavy foot is the key. Just don't do too much at rpm less than 2,000.
cage is offline   Reply With Quote
Old February 12th, 2005, 09:06   #3
Joshinthecity
Veteran Member
 
Joshinthecity's Avatar
 
Join Date: Dec 2004
Default Re: flexing turbo vanes

my bad. You're quite right. My car does pull way past 3k, and makes good power. It does not tail off at 3k, it's just that as far as making good fwd progress, there seems to be nothing gained by waiting till after 3,000. That seems to be the majic mark for my car at least. I assume that my vanes are beginning to flex before 3k at heavy throttle loadings? I just want to make sure that I am flexing them through their range of movement, but I don't see the need to push much further than that.
Joshinthecity is offline   Reply With Quote
Old February 12th, 2005, 13:18   #4
brucep
Veteran Member
 
Join Date: Oct 2002
Location: Vermont, USA
TDI(s): peebs4u2
Fuel Economy: best is 56MPG
Default flexing turbo vanes

I hope you dont REALLY mean flexing the vanes on the turbocharger. That would be very bad. Lets not forget that a turbocharger is made up of 2 spinning 'things'(Turbine ring and the compressor ring) hooked together by a common rotating shaft. If the vanes on either of these were to flex, they would quickly fatigue and break off causing the turbocharger to implode on itself.

( http://www.chuckiii.com/Reports/Physics/VNT_turbo.shtml )

Given that the vanes on the turbine ring are made of the material "iconel". They are very flex-resistant.

If what you mean to be asking is "Are the VNT vanes moving their full travel". The answer is yes. At idle, the VNT vanes are at FULL TRAVEL because of the low exhaust velocity. As the engine exhaust velocity increases, the VNT vanes "pull back" because there is excess energy in the exhaust.

This is all controlled by the engine computer based on many inputs. You are correct that beyond 3000RPM there may be no additional movement of the VNT vanes...but engine loading may change that.

This webpage desctibes the action of the vanes on a VNT (based on its original target engine design)
( http://thedodgegarage.com/5digits_turbos.html )
brucep is offline   Reply With Quote
Old February 12th, 2005, 21:00   #5
fhryder
Veteran Member
 
Join Date: May 2003
Location: New Brunswick, CANADA
Fuel Economy: 64/52/45
Default Re: flexing turbo vanes

When I first got my golf it had sat for 6 mo.
The vane actuator was rusted solid. I sprayed it repeatedly with wd40 and flexed it with a 9/16 open end wrench till I could move it with my finger, not easily. For the past 1 1/2 years I do what you're doing and so far it's staying free.

Frank
fhryder 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


All times are GMT -7. The time now is 09:43.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2019, 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 0.13530 seconds with 10 queries
[Output: 64.33 Kb. compressed to 56.71 Kb. by saving 7.62 Kb. (11.85%)]