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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 September 8th, 2016, 19:18   #31
red16vdub
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Quote:
Originally Posted by IndigoBlueWagon View Post
Unless I'm mistaken (which I am often) 2620 bar less one atmosphere is 23.7 PSI, give or take. I've always understood that the safe boost limit for a VNT-17 is 22-24 PSI. Both turbos mentioned here were running more than that.


26psi was recommended for what my mods were at that time. I have egt/boost gauges and certainly didn't exceed or reach what the car was tune for. The turbo blew out the exhaust along with 80% or so of the oil, luckily for me zero engine damage. I cut my losses and dug deep into the piggy bank for a 17/56


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Old September 8th, 2016, 19:58   #32
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Default Catastrophic VNT 17 failure

Pics of the grenade vnt 17
The turbine went out the 3" exhaust .

Bajan
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Old September 8th, 2016, 21:04   #33
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First turbo plate looks legit. To me anyhow.
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Old September 9th, 2016, 04:46   #34
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Originally Posted by turbovan+tdi View Post
First turbo plate looks legit. To me anyhow.


Yes it does


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17/56 turbo, RC ASV-5+ @ 28psi, 3 Bar Map, 11mm IP, PD Lift Pump, R520's, McNally boost/egt, Euro FIS full screen Cluster, PD 150 Intake/racepipe, PD 150 plastic T.I.P + R32 maf air mods, Kerma 2.5" Fmic, Kerma 3"T-B exhaust/resonator/ Aero turbine muffler, SBC stage 3 Endurance, GLi brakes F/R , GLi axles, H&R Bilstein sports cup kit.
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Old September 9th, 2016, 06:22   #35
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Originally Posted by HelenaTDI View Post


This is what is left of my compressor. I flushed out my IC with a gallon of acetone today. Cleaned all the intake piping as well. Air cleaner looked fine.
Do I trust using the IC or get a new one? I used compressed air to blow anything out afterwards.
Had a cup or so of oil pour out the IC. Where did the other 1qt or so of oil go? Tried running a magnet down my down pipe as far as I could go. Couldn't retrieve the exhaust turbine and shaft. Not sure if it blew out the tail pipe. I shouldn't have any interferences so maybe it's out.
Compressor stall at the Exducer, tips are all missing....
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Old September 9th, 2016, 06:26   #36
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Quote:
Originally Posted by red16vdub View Post
26psi was recommended for what my mods were at that time. I have egt/boost gauges and certainly didn't exceed or reach what the car was tune for. The turbo blew out the exhaust along with 80% or so of the oil, luckily for me zero engine damage. I cut my losses and dug deep into the piggy bank for a 17/56


Bajan
Stop focusing on the 26psi, were you flowing enough volume at 26psi to prevent surge/stall of the compressor?

a bigger turbos isn't going to necessarily solve it if you haven't improved the volumetric ability of the engine to allow the increased capability to pass thru it.
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Old September 9th, 2016, 06:40   #37
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Centrifugal compressor stall patterns..


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Last edited by Drivbiwire; September 9th, 2016 at 06:43.
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Old September 9th, 2016, 07:10   #38
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Quote:
Originally Posted by Drivbiwire View Post
Stop focusing on the 26psi
It should be noted that 26psi is a ~2.8 pressure ratio. Off the top of the map (compressor rpm) for the VNT17 at just about any mass flow.
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Old September 9th, 2016, 07:21   #39
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Here's the map, 1749.

Its that dashed line on the front end of the map that blew that turbo...

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Old September 9th, 2016, 09:10   #40
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Quote:
Originally Posted by Drivbiwire View Post
Stop focusing on the 26psi, were you flowing enough volume at 26psi to prevent surge/stall of the compressor?



a bigger turbos isn't going to necessarily solve it if you haven't improved the volumetric ability of the engine to allow the increased capability to pass thru it.

I'm not quite sure how to answer that , but will say the only changes made was different turbo and retuned.



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Mk1 Gti /scIROCco 16v /A6 quattro sport / Mk4 TDI JSW 5spd
17/56 turbo, RC ASV-5+ @ 28psi, 3 Bar Map, 11mm IP, PD Lift Pump, R520's, McNally boost/egt, Euro FIS full screen Cluster, PD 150 Intake/racepipe, PD 150 plastic T.I.P + R32 maf air mods, Kerma 2.5" Fmic, Kerma 3"T-B exhaust/resonator/ Aero turbine muffler, SBC stage 3 Endurance, GLi brakes F/R , GLi axles, H&R Bilstein sports cup kit.
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Old September 9th, 2016, 23:08   #41
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Honestly, I am confused myself; how could a turbo be making that much boost and have an issue with stall? I could maybe understand a gasser with a bad b.o.v., but our diesels don't have throttle bodies.
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Old September 10th, 2016, 10:30   #42
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Tips are missing because they were machined off by the compressor housing.

Can't see how it would stall as well.
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2003 GSW, 2.0L ALH, Stage 2 Colt Cam, 1756 turbo, auto, silver, 380k-Wife's.
2004 GSW TDI, blue, 5 speed-DD-Malone stage 2, no kitty, aeroturbine muffler, PD150's.
2003 JSW 1.8T, silver-parting out. 2006 JSW, TDI 5 speed, blue.
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Old September 10th, 2016, 12:27   #43
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Kinda related here. I have a vnt17 stock tune. I won't have any stall issues will I? I don't do hard launches


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Old September 10th, 2016, 17:42   #44
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Not likely with a stock tune .
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Old September 10th, 2016, 18:07   #45
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Thx. Just making sure since it may be after new years for the tune now.


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