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<DIV>It has nothing to do with the 55 mph thing. My 2006 RSX Type S spins
at 3700 RPM or so at 75 MPH (and that's with a 6 speed!). Its about
keeping the engine spinning where the power is. I made many a trip in my
SE-R and even at 80 Mph, closing in on 4k RPM, it still got 32 MPG on the
highway. I really do not find engine noise to be the problem with these
cars at highway speeds. Road noise is much more of a problem. I am
not sure dropping engine revs is going to make a whole lot of difference in
noise.</DIV>
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<DIV>In a message dated 8/20/2009 2:57:39 P.M. Eastern Daylight Time,
grega@pobox.com writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>Back
when I bought my brandy-new 1984 Rabbit GTi, I thought I was in heaven. For
those of you who were still suckin' your mammy's teet back then, that car was
a breath of fresh air in the stale environment of post-emissions and -safety
automotive dregs. Bigger engine, more torque, close-ratio gearbox. Car only
had one annoying downside: buzzy at highway speeds. But, back then they had an
excuse: the NHMSL of 55 mph. After all, why optimize a car for 70 mph cruising
when you can only do 55? Hell, they even had speedometers that ended at
85mph...<BR><BR>Cut to 10 years later, and Nissan offers a nice improvement on
the theme, with the SR20-powered B13/B14s. But, similar problem: 3500 at 70
mph? Why?? Nissan can't even lay back on the old "55 mph excuse" as the NHMSL
was repealed. Let's move forward another 15 years, and I'm playing with my
NX2000, installing an even more-torquey and -flexible engine, so I *really*
don't need to be pulling a noisy 3500 RPM at highway speeds.<BR><BR>So, what
to do about it?<BR><BR>Well, I'm looking to take the same tactic as we did in
the Rabbit GTi. Back then, the big trick was to replace the GTi's fifth gear
(0.91) with one from either the convertible (0.76) or the diesel Rabbit
(0.71). It was an easy in-the-car swap and brought the revs down to reasonable
speeds while cruising. It didn't really hurt performance, because if you were
racing or doing best accel (or drag racing) you'd never used fifth anyway.
Yeah, the 4th-to-5th shift was a tad annoying, but that annoyance was quickly
eclipsed by the fact you were turning <3000 RPM on the highway. And, you
got used to it. Like, the second time you shifted.<BR><BR>So, what are my
options with the RS5F32V? Are there parts in the "family" to let me do
this?<BR><BR>The 5th gear in my NX is 0.756:1, giving me about 3500 RPM at 75
mph. Optimally, I'd like to find something that will drop the revs to 3000 or
below, which would require a ratio around .65; nothing I can find in the
RS5F32V family has that. Closest I found was the RS5F31A trans which had a
.733 fifth, but that only drops the revs 100 or so, hardly worth the effort.
In fact, the ONLY gear I found that was in the range was the sixth gear from
the SpecV/Altima trans (RS6F51H) and it's 0.63 (~2900 RPM in fifth). I'm
perfectly OK with that jump from 4th to 5th; again it's all about maintaining
acceleration from 1-4 then dropping the revs for cruising. But will that gear
fit? Are the shaft sizes the same, are the gear centers the same? Of course I
have no clue.<BR><BR>Then again, if it DID fit, then I could even consider
dropping in the Suny Lucino 4.437 final drive, IMPROVING acceleration in 1-4
*and* improving cruising RPMs on the highway (~3100)!<BR><BR>So....what's the
chances ANYONE would have a clue on the physical specs for that sixth gearset
(or even one they could send to me)? Are they even close enough where I could
modify/broach the splines to make it work?<BR><BR>Alternatively, I suppose I
could install the SE-R 6-speed in my NX, but that just seems like overkill.
I'm guessing it's neither cheap nor easy...<BR><BR>Thoughts
appreciated.<BR><BR>GA<BR><BR>+----------------------------------------------------------------------+<BR>The
mailing list home page is http://www.se-r-list.org/<BR>To modify your
subscription, go to
http://www.se-r-list.org/mailman/listinfo/se-r<BR></FONT></BLOCKQUOTE></DIV></FONT><DIV CLASS="aol_ad_footer" ID="726d831fd6011da5cd32fa694f319d3e"><br/><font style="color:black;font:normal 10pt arial,san-serif;"> <hr style="margin-top:10px"/></font></DIV></BODY></HTML>