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 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.

Thread Tools
Old November 12th, 2007, 00:17   #1
Veteran Member
danielhf's Avatar
Join Date: Mar 2007
Location: Dallas, TX
Fuel Economy: 23/28/27
Default 3 bar map sensor upgrade?

Recently my car has been running into a few strange problems after my new tune (RC3+):

Once the car warms up it performs beautifully. It effortlessly sustains 21 PSI. If I go beyond that, let's say 25 PSI, the car hits a brick wall. I lose all ability to accelerate and can only hit a new maximum of 6 PSI or so, while pouring smoke and watching the EGTs climb a few hundred degrees.

Upon turning off the car and restarting it, everything's fine and back to normal. I do not have a huge lead food problem, so I don't run into the 25 PSI range very often, so I really only encounter this problem once a week, if that.

As this is, what I believe to be, the situation known as "limp mode," I believe I have covered most of the bases.

1) I installed a new N75 two months ago
2) With the new PD150 turbo inlet pipe that I installed 2 weeks ago, a new MAF was installed

This only leads me to believe one thing, either my new N75 or MAF is bad, or I need to install the 3 bar map sensor. Are my conclusions sound? Any better ideas or suggestions?
12 Golf .:R - IE450T, HPA Haldex controller, etc. - no more TDIs
04 .:R TDI - Conversion Thread 246 AWHP 343 AWTQ - SOLD
PD150 w/4motion TDI 02M & LSD, TD Tuning Full Race Tune, GTB2260VK, etc...

02 Reflex Silver Golf Variant TDI - TOTALLED!
danielhf is offline   Reply With Quote
Old November 12th, 2007, 00:25   #2
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

You may want to get some Vag-com logs to see what your "requested" vs. "actual" boost looks like because it seems your ECU is shutting things down because it's not liking what it's seeing (or not seeing if it's your MAP sensor).
First documented MK4 VNT20 Installation in North America!!

Ed's TDI is offline   Reply With Quote
Old November 12th, 2007, 03:01   #3
Veteran Member
Join Date: Dec 2006
Location: Belgium

Normally if you want to run more then 22.5psi of boost you need a 3bar MAP..

You experience the limp mode caused by overboosting, maybe the vnt vanes are stuck.. remeber if you are now running 21psi of boost and you swap in a 3 bar map you will be running 28psi if you don't remap the ecu to work with the 3 bar map..
'99 Black Ibiza GT90: 2260v, ARL bottomend, rosten rods 81mm slugs, 17:1 CR, 35/38mm exh/in valves, 02M, 305mm discs with Brembo calipers, OZ Superturismo 16"x7.5J, .............
Dyno'd area, Old VNT20 setup dyno'd 192whp
Rub87 is offline   Reply With Quote
Old November 12th, 2007, 04:56   #4
Veteran Member - TDIClub Enthusiast
jsrmonster's Avatar

Hi Dan,

You may want to lengthen the vnt actuator rod 2 turns on the nut. This will give a bit more return spring force on the vnt trim ring. Check it with a handheld vaccume pump, should be around 5-6" Hg cracking vaccume. Check before and after and let me know.

Check for vaccume leaks and boost leaks, this can run the duty cycle very high too causing limp in 3 sec. A boostvalve can help too if you are an agressive driver and stab the throttle alot (w/automatic).

Get me some vaglogs too please, 001, 003, and 011, then 001, 004, and 011 for wot blast (don't need high speed run, just 100% duty cycle for 4000 rpm) Shut down can also occur if IAT gets too high, this gives same fault as overboost. I can eliminate the boost limitation byte, and charge air overtemp limitation, but it is there for hardware protection on street tunes.

15 Golf SW DSG, 00Jetta 6spd race, 99.5Jetta Rocket ARL-PD150 6spd 2260, 2003.5 5.9L Cummins QCLB 4x4 Blue Monster, 00Passat1.8T, other tdi's: 97J, 98J, 99.5J2x, 00-C5 6spd - EFILive, HPTuner, Diablo Sport!
Never argue with an idiot.They will just bring you down to their level and beat you with experience.
The beatings will continue until the morale improves!
Good judgement comes from experience, and experience comes from bad judgement !

jsrmonster is offline   Reply With Quote

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 12:24.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2020, 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 0.14740 seconds with 10 queries
[Output: 63.20 Kb. compressed to 56.42 Kb. by saving 6.78 Kb. (10.72%)]