E28 Stuff

["Hunt, Reed (CAP, GEFA)" <Reed.Hunt@xxxxxxxxxxxxx>]

Steve,

Just read your post below and have a couple of thoughts/questions.

I make the Seattle - Portland - Seattle trip frequently, as my wife and her
family are from P-Town.  My 1985 535i, at between +5 and +10 over the posted
limit (60 or 70) will regularly get 24-25 MPG.  My plugs probably have 50K
miles on them (shame on me), wires/cap/rotor about 40K, I have a Dinan chip
(for about 6 years, would buy the Jim C. in a heartbeat now), and a LARGE
K&N stuffed in tight behind the right headlights (airbox removed).  Oh yeah,
I have had the full Stebro setup for about four years.

I agree with your Stebro aural delights discussion completely - boom city
around 2K RPM, push on past and the thing just sings.  Second and third
gears, from 3K through 5.5K are simply a wonder to behold!

I too am waiting on the silencers - they were due early this month (after
some initial delays) so the fact that you haven't received yours confirms
what I already suspected - great product, something missing on the
production/operations side.......but they are trying.

I have also spoken with Aaron, and he is a big fan of the silencers.
Hopefully one of these days.

I think you may have answered your own before and after mileage question,
but I am curious about your mileage in general.  I get 17-18 around town and
as mentioned above, 24-25 on the highway (at somewhat above the posted
limit)  :-O

What state of tune is your car in?  

Also, I have a 3.25 LS rear end, which I believe your "is" should also have,
and I am assuming you have a 5-speed.....(as do I)

Here's hoping the silencers arrive before Valentine's Day.

Regards,

Reed
Seattle
1985 535i
163K
>>>>>>>>>>>>>>>>>>>>>>>>>>>>
		Having just installed full Stebro "free flow" stainless
steel cat & exhaust, (but not the "tip silencer" inserts yet), I have
noticed a curious mpg anomaly.  The around town mileage went down from
around 17-18 prior to around 15 with this low back pressure system.  However
on a run from Portland to Seattle and back it easily did 23 mpg, which is
close to prior highway mileage.  (This requires staying within about 2mph of
the posted speed).
		So the question is whether it is logical that reduced back
pressure at low speeds could reduce fuel economy?  Or is it (more likely)
that the driver is either:
		a.	favoring rpm over 2k to get out of the resonant
boomy mode; or
		b.	getting sucked in by the exotic sounds created as it
comes on the cam around 3k and ...

		(guttural mild staccato reminiscent of a 1972 V.Polak 911 in
turns 7-9 at PIR, or an E-Jag with no muffler once heard winding out up
Portland's Canyon Road... ahh nothing like a 6!)
		(but Aaron Bohnen please tell me it kills the <2k boom to
put in the silencers when they arrive??)
		Mr. Conforti you are truly a genius, and should be awarded
the UUC Roundel of Honor medal for your response recently re more efficient
fuel burning with your chip.  How could any S.O. object to that!
		Steve Poland
		'88 535is
		Portland, Or BMW ACA, CCA
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

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