www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums TDIFAQ Articles Links Meets
Orders TDI Club Cards TDIFest 2014 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 April 3rd, 2012, 03:04   #1
ruds
Member
 
Join Date: Jun 2010
Location: UK
Default Repercussions from simply fitting a larger turbo?

Hey guys,

I have a 130bhp variant of the TDI engine fitted to my T5. There is a 174bhp version and I have a brand new Garrett VNT turbo from the 174. I am told it is a straight swap.

I have had my 130 remapped to ~160bhp but although it has made a big difference there is a large flat spot in the power band from 2000-3000rpm. I don't know what causes this?

Other than that issues I have no other problems that I know of.

What would happen if I simply fit the 174 turbo and do nothing else?
ruds is offline   Reply With Quote
Old April 3rd, 2012, 12:19   #2
m1ketdi
Veteran Member
 
Join Date: May 2009
Location: Leam
TDI(s): Leon BKD
Fuel Economy: 50+mpg
Default

It would be a waste of the turbo, get a new custom map to go with it. You might need bigger injectors too though...
m1ketdi is offline   Reply With Quote
Old April 3rd, 2012, 23:22   #3
Ed's TDI
Veteran Member
 
Ed's TDI's Avatar
 
Join Date: Jan 2001
Location: Victoria, BC, Canada
Fuel Economy: 5.7 / 5.1 / 4.5 L/100km
Default

Quote:
Originally Posted by ruds View Post
What would happen if I simply fit the 174 turbo and do nothing else?

Without more specific info on the turbo size/model, I'd guess te result would be a laggier response in spool up down low and possibly an even more noticeable "flat spot" . I agree with m1ketdi that you would likely need to get bigger injectors to supply more fuel, and you'd definitely need a remap for all the new hardware, otherwise why even bother. Just my 2 cents' worth.
__________________
First documented MK4 VNT20 Installation in North America!!
Done by JS Performance in Abbotsford, BC, Canada

Ed's TDI is offline   Reply With Quote
Old April 4th, 2012, 07:34   #4
faboka
Veteran Member
 
Join Date: Sep 2004
Location: Merseyside, England
Default

If your current tune overfuels then fitting the larger turbo might result in this unburnt fuel now being used making more power.

Personally I'd get it mapped to suit the new turbo. What's the details of the turbo?
faboka is offline   Reply With Quote
Old April 4th, 2012, 08:22   #5
ruds
Member
 
Join Date: Jun 2010
Location: UK
Default

Thank you for your replies guys!

The reason I asked was incase there was no downside to fitting it now and having it remapped to take into account the turbo upgrade within the next month or two. I had wondered if the flat spot in the tune at the moment was due to a lack of airflow but I don't see any smoke at WOT so maybe it's something else.

I do not know the exact specs for the turbo in there now but the replacement says the following:

Garrett GTB1752
M68 A/R .74 (hot side)
M53 .45 9 (cold side)

Some guys have sent them away to be upgraded but I'm not sure what I would ask for...

The company that I will have remap it have said the injectors have been good so far up to 220bhp and even at that are still not at their limit so hopefully I can keep the stock injectors for now.
ruds 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
Long term limp mode repercussions? ewenmaclean VW MKIII-A3/B4 TDIs 2 January 19th, 2011 09:12
Larger Turbo and Auto w/o new tune? FirstOrbit84 TDI Power Enhancements 7 December 30th, 2009 22:40
Exhaust manifold for larger turbo? ini TDI Power Enhancements 1 June 14th, 2007 05:50
Preformance Mod- Larger Turbo? itsmejerry VW MKIV-A4 TDIs (VE and PD) 1 March 30th, 2004 13:39
larger turbo may = better fuel economy JohhnyQ TDI Power Enhancements 3 December 12th, 2001 00:54


All times are GMT -7. The time now is 22:30.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2014
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 - 2013, All Rights Reserved
Page generated in 0.14745 seconds with 12 queries
[Output: 68.48 Kb. compressed to 60.75 Kb. by saving 7.73 Kb. (11.29%)]