Date: Sat, 19 Jan 2008 19:45:35 -0500
Reply-To: Karl Mullendore <groups@WESTYVENTURES.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Karl Mullendore <groups@WESTYVENTURES.COM>
Subject: Feedback on gearing options, TDI converted vans
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As some of you may remember, the transmission in my TDI-powered Syncro
failed about 100 miles into a roadtrip last winter. This tranny was the
first rebuild on the original tranny, the original factory build failing
(3-4 shift hub) at 270,000 km. This rebuild lasted another 270,000 km,
almost exactly. The rebuild was done with 1.14 third and .77 fourth
ratios, stock 4.86 R&P. Since, I've been driving around on a borrowed
tranny for the year, and finally this week I made a break in my crazy
shop schedule to build the old tranny. Yes, I could have sent it to
Daryl at AA Transaxle and had it done many months ago. But for whatever
reason I decided I had to do it again myself. I did get the parts from
Daryl. :-) As well as a little support when I had brain fade a few times
and couldn't remember the correct location or spec on a part. Thank you,
DARYL!!!
Anyway, this time around I replaced all bearings, added the South
African oiling plates, and upgraded the ratios once again, this time to
1.88 second, 1.08 third, and .70 fourth, staying with the 4.86 R&P.
This, by the way, is about the tallest gearing I think is available for
the Syncro. The engine I'm currently running is a 1.9 liter TDI four,
AHU-code, mechanical injection pump, with slight upgrades to the turbo
and injectors for more power. Tire size is 30 x 9.5 x 15.
When the old tranny was installed with .77 fourth, the engine sometimes
seemed to need taller gears on the highway, and the spacing of the
ratios was uneven. I was a little worried that .70 might turn out to be
too much, but today I took the van on it's first drive with the fresh
tranny installed. What a great success! The van drives so much better
than it did before, loafing down the road at nearly the rpms the TDI was
designed for, still plenty of pulling power on the hills. I now have
that '3-and-a-half' gear I always wanted (third too low, fourth too much
on long steep grades) as well as the high top gear it needs. The spacing
seems perfect; the jumps from one gear to the next are very noticeable
and would really be bad news for any other conversion that lacks torque
in the lower rpms, but the TDI works fabulous! I can't wait for my next
road trip.
Karl Mullendore
www.westyventures.com
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