Re: oilheads-digest V2 #50

["Tom Brown" <tbrown@xxxxxxxxxxx>]

Ben:

I see you're at it again.

1.  Paper air filter has more flow than the airbox.    You must hack up the 
air box to get more flow.   BMW made the air box to regulate flow.

2.  K&N already makes a filter for Oilheads.   I have one in my garage.   It 
makes zero difference on my RT with stock airbox.   If you want to buy it, 
I'll sell for $20 plus shipping.   It's been used, but not long.  No where 
near needing cleaning yet.   According to the display in the dealership I 
bought it from for over $50, there is a lot more flow available with this 
filter.   About 4 times the paper one.

3.  The issue with the surging is that the bike runs too rich for the oxygen 
sensor at certain speeds.  When the sensor trips, it forces the lean fuel 
curve that causes the surging.   Motronic kicks in and out of this alternate 
lean curve at certain RPMs.

4.  With the Techlusion in Control Mode, you've got the Motronic stuck on a 
lean fuel curve and you add fuel yourself by extending the "open" signal on 
the injectors, so by messing with the air box and the Techlusion, you may 
get some good results.  Mileage will most likely suffer a bit, but you'll be 
able to pull wheelies without using the clutch probably.   I've heard of 
this being done and I think there's some info on the Techlusion website 
about it.   Check it out.

5.  What you should be asking for on the list is a spare airbox for an S in 
case your surgery goes wrong.

6.  Bear in mind that what most BMW riders want is rideability, reliability 
and long distance capability.   An aftermarket or home made filter with an 
airbox that might let rain enter the intake system is not attractive to most 
of these people.   If you are harboring visions of making money with the 
fruits of this project, well, I think your chances are pretty slim.   Wrong 
market for this.   BMW hot rodders are few and far between.

Eliminating surge is something Oilhead riders want to do, however.   That's 
why double plugging and Techlusion boxes have been successful.

- -TB



- ----- Original Message ----- 
From: "oilheads-digest" <owner-oilheads-digest@xxxxxxxxx>
To: <oilheads-digest@xxxxxxxxx>
Sent: Thursday, March 03, 2005 3:47 AM
Subject: oilheads-digest V2 #50


>
> oilheads-digest        Thursday, March 3 2005        Volume 02 : Number 
> 050
>
>
>
> In this issue:
>
>    Old air filters for R1100S needed
>
> ----------------------------------------------------------------------
>
> Date: Wed, 02 Mar 2005 18:33:09 -0500
> From: Ben Barkow <dr.ben@xxxxxxxxx>
> Subject: Old air filters for R1100S needed
>
> For R1100S please.
>
> I'm ready to do some experimenting with Uni oiled foam air filter medium.
> But I need a few old paper filters for testing and mock-ups and good 
> advice
> too.
>
> 1. If anybody has experience and/or theory about the results of changing 
> air
> filters (to K&N, for example) apropos the ECU or otherwise, please share 
> it
> with me/us.
>
> I think oiled foam is surely the way to go for home-maintenance riders
> (except maybe when you have to take the tank off to deal with the filter,
> eh) AND providing you can compensate in fuel metering. In as much as the
> Oilheads tend to be lean and the O2 feedback comes into operation only for
> special conditions, I wonder if the ECU compensates for freer flowing air?
>
> 2. I need a few used R1100S air filters for R&D. While the R1100S is 
> fairly
> unpromising given the miniscule airfilter space and the unclever way BMW
> concealed it under the tank, I'm still hoping R&D will lead to a good
> filter. If anybody has a stock airfilter which they think is still
> reasonably free-flowing and thus could provide a benchmark flowrate for 
> me,
> that would be especially welcome.
>
> Please ping me off-List if you can spare some oldies. Thanks.
>
> Cheers.
>
> Ben
> - -- 
> Ben Barkow, Toronto... 39 seasons on Beemers, 44 as a biker,
> 1961 R69s/rod, 1967-1999... really sup'ed up and fast
> 1984 R80RT/rod, 1998- 5 extra peak ponies in a wider flatter power band,
>  much modified 2-into-1 exhaust, CR 9.5, Keihin PJ 34mm oval carbs,
>  Uni filter, dual-rate springs with cartridge emulators,
>  BT45/S11, Saeng fairing
> 1999 R1100S, 2004- Leo Vince exh, JetHot coatings
>
> ------------------------------
>
> End of oilheads-digest V2 #50
> *****************************

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