Author Topic: Very little boost on my mTDI ALH Vanagon install  (Read 22411 times)

Reply #75May 06, 2020, 03:36:01 pm

libbydiesel

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #75 on: May 06, 2020, 03:36:01 pm »
I have not used the GT2052 turbo.  I believe Karl M. has recommended that before.

Some folks have run the Holset 221 or 200.  I have not run those either, so I cannot comment.  Maybe send a note to Gizmoman as I know he is running one on an AAZ.   

Reply #76May 06, 2020, 07:40:57 pm

libbydiesel

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #76 on: May 06, 2020, 07:40:57 pm »
I would also mention that the VNT 1749VA from the B5.5 passat is relatively available used right now, would be a better match than the stock ALH VNT 15, and it imight fit with your driver's side mount if you use the matching b5.5 exhaust manifold. 

Reply #77May 06, 2020, 07:44:09 pm

libbydiesel

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #77 on: May 06, 2020, 07:44:09 pm »
Here's an example:

https://www.ebay.com/itm/VW-Passat-2000-2004-B5-5-AVF-Turbo-Turbocharger-With-Manifold-038-145-703-G/332663018104?hash=item4d7442d278:g:tJcAAOSwG-1WwzK1

I would also mention that on my '79 rabbit I mounted an external wastegate to the EGR valve port and have just run the vanes stationary but with the ability to adjust their angle.  That basically makes it a wastegated turbo that you can size to fit your preference.   

Reply #78May 06, 2020, 09:57:12 pm

Zeitgeist

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #78 on: May 06, 2020, 09:57:12 pm »
Very interesting.  Unfortunately that B5.5 design would interfere with my intake manifold, unless I welded up an extension for the turbo to hang off of.  Or, can that actuator be re-clocked?
'87 300TD (OM606)
'90 300D (OM602)
'89 Vanagon Bluestar (ALH)
'01 EV Weekender (AXK)
'04 Passat Variant (BHW)

Reply #79May 07, 2020, 12:43:48 am

libbydiesel

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #79 on: May 07, 2020, 12:43:48 am »
The actuator cannot be re-clocked without a lot of custom work.   

Reply #80September 28, 2020, 01:40:55 pm

Chuck1978

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #80 on: September 28, 2020, 01:40:55 pm »
How is your project running with the new mTDI pump?

I also have PP764 injectors and a GT2052 turbo, although I'm contemplating putting an AAZ K14 turbo on the ALH mTDI to save the GT2052 for a 2.0 BHW/ALH hybrid

Reply #81September 29, 2020, 07:11:28 pm

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #81 on: September 29, 2020, 07:11:28 pm »
Sorry, I didn't see this until now.  It's running excellent.  The power and smoothness is exactly what I was looking for when I started this project.  It's a complete joy to drive, except the gearing is still too short with the DK trans and 28.5" rear tires.  I just received a 3.08 R&P and the auto trans assembly should arrive tomorrow.  I'm hoping this combo isn't too tall, as I've not seen nor heard of anyone running this tall of a trans with a TDI.  The vendor tried to convince me to get a 3.27, but I wanted to take one for the team and advance our collective understanding.  Please cry for me if this is a flop. 
'87 300TD (OM606)
'90 300D (OM602)
'89 Vanagon Bluestar (ALH)
'01 EV Weekender (AXK)
'04 Passat Variant (BHW)

Reply #82June 09, 2021, 02:48:37 pm

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #82 on: June 09, 2021, 02:48:37 pm »
The van has been humming along just fine, with excellent power.  Unfortunately yesterday I totally grenaded the transmission.  The R&P is clearly missing large chunks, which was painful to hear while I limped five miles back home.  I'm sure it's a total loss. 

Thankfully, I have a backup auto trans with a 3.08 R&P, but I still have to reassemble it and order a new adapter plate and starter adapter.  No rest for the wicked. 
'87 300TD (OM606)
'90 300D (OM602)
'89 Vanagon Bluestar (ALH)
'01 EV Weekender (AXK)
'04 Passat Variant (BHW)

Reply #83June 09, 2021, 02:51:27 pm

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #83 on: June 09, 2021, 02:51:27 pm »
Forgot to mention that I recently bought an '04 Passat Variant with a BHW TDI, but of course it's in nearly constant limp mode while I await my new VCDS dongle/cable.  Sure wish I could mTDI this thing...
'87 300TD (OM606)
'90 300D (OM602)
'89 Vanagon Bluestar (ALH)
'01 EV Weekender (AXK)
'04 Passat Variant (BHW)

Reply #84June 09, 2021, 06:34:20 pm

libbydiesel

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Re: Very little boost on my mTDI ALH Vanagon install
« Reply #84 on: June 09, 2021, 06:34:20 pm »


WOW!  I'm sorry to hear about the trans death!  Eager to hear about the auto swap, though!  "The trans is dead.  Long live the trans."

Hopefully the limp mode issue on the Passat is easy to sort out.

 

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