[T3] 1971 Squareback F.I. Auto; new engine coming (Stet Sanborn)

[Phil Hof]

The automatic can handle a little more power without any trouble.  As posted, I’d replace the gasket between the tranny and differential while it’s relatively easy.  Aw, heck repack your CVs and check the boots while you are greasy and in a foul mood!

I am running 1776 and chose to use larger injectors to avoid leaning out at higher rpm.  I installed an O2 sensor and calibrated the MPS using a kit that included the tools and special plug.  I got it pretty well dialed in now.  It was not cheap, but this is my “forever car” so I didn’t mind.

I think some have used the expedient of raising the fuel pressure to get a little more squirt, rather than using larger injectors. You would still have to recalibrate the MPS using an O2 sensor.

Here is a link to the thread describing my adventure:
https://www.thesamba.com/vw/forum/viewtopic.php?t=629183&start=37

It may be that rebuilding your engine, maybe with a tad more compression ratio and premium gas, will give you what you need, and not require larger injectors or the MPS recalibration.

Another thing to consider is the state of your FI wiring harness.  Mine was crispy and I started getting intermittent failures as described in the thread.  I bit the bullet and bought a new one, again pricey but really well-made and it will last me another 45 years I think!  If nothing else, cleaning tighten all connectors (the double-rolled-edge parts inside, not the plastic case) and you will avoid some trouble.

Keep us posted!
-Phil

> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 3 May 2017 13:54:44 -0700
> From: Stet Sanborn <stet.sanborn at gmail.com>
> 
> Hey Everyone -
> 
> First off, thanks for years of great advice; I've been lurking for a long
> time and many of your emails have answered questions I didn't even knew I
> had.
> 
> I'm starting the planning process for an engine replacement on my 1971
> Squareback.  I'm planning to retain by fuel injection, as its been trouble
> free for me for the last 9 years, and I used to work for Bosch, so I have a
> sentimental attachment to it.  I'm likely going to purchase a longblock
> from ACN, mostly to save time off from work.  Here are my questions, before
> I dive too deep:
> 
> 1) I've got the factory 3-speed auto.  The car has just over 100,000 miles
> on it; if I'm doing an engine swap, should I also find a shop to do an
> overhaul on the transmission?  I haven't noticed any problems (other than I
> need to adjust my kickdown switch).  But; given age, etc... is it best done
> now while I've got the engine already coming out? They seem to be a pretty
> robust build.
> 
> 2) I'm trying to decide between a stock 1600, or ACN's 1800cc
> mini-stroker.  Any trouble with a larger displacement and the Automatic
> transmission?  A few folks on Samba have indicated they've done the 1800cc
> with stock F.I; but I wanted to run in by the experts.  I wouldn't mind a
> bit of extra power, but not at the expense of other parts of the car.
> 
> 3) The car also has the dealer installed A/C unit, although I'm pretty sure
> the compressor was leaking, so I disconnected it years ago and plugged the
> holes into the fan housing.  Have their been any new products out there for
> replacement compressors (more efficient, less drag, etc) that anyone has
> seen?  I'm tempted just to pull it out completely, but might give it
> another shot at life.
> 
> Cheers,
> Stet
> ------------------------------