Possibly you folks aren't shifting your gearbox properly.
I run 3rd gear out to 55 mph and that is 4,000 Rpms.
At that velocity it quickly climbs to 65-70 rather quickly.
If you engine is going flat (loss of power) at below 3500 rpms, I'd
suspect that the rebuilder stuck your old worn out cam back in.
Peak power for my 83 Air Cooled Type IV engine is 2400 - 3500 rpms seems
to be the best power range.
After speed is reached (70 mph at 3300 rpms) it will still respond pretty
good.
If your AFM is tuned down lean to pass the state inspection you may just
be running out of the fuel to run harder.
The altitude you operate is also a factor if you're over 5,000 feet,
otherwise it shouldn't make much difference.

Stan Wilder
83 Air Cooled Westfalia

On Thu, 3 Oct 2002 12:46:58 -0400 dr <dxrobertson@NETSCAPE.NET> writes:
> I am one of the participants in the performance thread.  I just
> replaced
> my injectors and my 82 aircooled now does 0-60 in about 32 sec.
> Before
> the injectors, mine did similar to yours; it seemed to take forever
> to
> get from 40/45 up to 60.  My 4th gear seems to be like yours; seems
> to
> be a big ratio difference between 3rd and 4th; I think its just that
> way
> and nothing is wrong with or different about your 4th gear.  I

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