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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 August 24th, 2010, 15:19   #1
DRVRFWND
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Default AHU to AFN VNT turbo swap - need vacuum routing help

1998 jetta TDI with AHU

Looking to put in a VNT17 and wondering where the vacuum lines should go. I have attached the vacuum diagram for an AFN motor. What is necessary and what can be omitted?

Current setup
1749VC
PD150 intake manifold
AFN exhaust manifold
Rocketchip tune with 3 bar map sensor
.216 nozzles
2 1/2" downpipe straight exhaust

I was looking through the diagram below, it seems like there are 2 N75 valves, I will not be using an EGR so I was thinking I could remove that section of plumbing. Also, are the vacuum reservoir and check valve necessary? Any advice would be appreciated. Thanks in advance.

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Old August 25th, 2010, 06:52   #2
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Old August 25th, 2010, 11:29   #3
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if you want to be able to run actuator test you need a checkvalve and vacuum ball, otherwise you can leave it out
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Dyno'd area, Old VNT20 setup dyno'd 192whp
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Old August 25th, 2010, 20:45   #4
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i have a boost valve i want to put in as well, where would that go in the mix?

thanks guys

Vic.
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Old August 26th, 2010, 01:06   #5
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with a T piece in the line from N75 to actuator..

Btw, did the goods already arrive?
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Old May 24th, 2013, 09:50   #6
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Sorry to resurrect an old thread but what does the vacuum ball do and does it need to be in the system?

Mine seems to have been left out..

FF
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Old May 24th, 2013, 09:55   #7
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It's used to test the actuator with vcds/vagcom with the engine off.
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Old May 24th, 2013, 10:14   #8
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So its not really needed in every day use?
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Old May 24th, 2013, 14:40   #9
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Quote:
Originally Posted by Seatman View Post
It's used to test the actuator with vcds/vagcom with the engine off.
It's not really why it is there. It is there to allow there to be an amount of vacuum at all times even at idle or when braking and the brake servo is using most of the vacuum.
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Old May 25th, 2013, 15:07   #10
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Plenty of folk over here without one and having no side effects, what side effects can you think of? There was talk about on here before and that was the result, it was said that it was only there for testing the vnt with the engine off because obviously it stores vacuum.
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Old January 23rd, 2014, 02:37   #11
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Does anyone on here have a diagram for the afn pre pd engine??
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Old January 24th, 2014, 17:18   #12
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I would think having a vacuum ball would help the response of the turbo positively. Greater vacuum and more volume of vacuum at any given time can't be a bad thing.
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Old January 24th, 2014, 17:22   #13
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Quote:
Originally Posted by daffeduff View Post
Does anyone on here have a diagram for the afn pre pd engine??

Post 1 and 2 have both got vnt diagrams in them, what else are you needing?
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Old June 13th, 2015, 14:44   #14
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Quote:
Originally Posted by Seatman View Post
Post 1 and 2 have both got vnt diagrams in them, what else are you needing?
Seatman,

Sorry to res an oldun again but the first pic shows the early AFN diagram with the MAP in the ECU but not the later verson, and the second pic has disappeared... maybe that had the later versions diagram....


I think I know where the vacuum ball would go but it would help to have a completed forum post and have the answers for a change.


FF
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Old June 13th, 2015, 22:40   #15
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The vacuum ball on the afn is down at the front left of the engine beside the turbo and behind the n75
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