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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.

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Old November 12th, 2007, 00:17   #1
danielhf
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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?
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Old November 12th, 2007, 00:25   #2
Ed's TDI
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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).
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Old November 12th, 2007, 03:01   #3
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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..
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Old November 12th, 2007, 04:56   #4
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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.

Jeff
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