Loren

        Cheapest&Easiest RPM Dropper is to put bigger tires on the Rear ~ My VDUBARU is a 4spd2wd 90Westy + 2001 ImprezaRS EJ25 ~ Its Trany has

stock gears 1-3 & a .77 4th ~ I run 225/60r15s on the front so the Speedo&Odo are correct & 235/75r15s on the rear so I am able to cruise along @ 

80MPH (whenever the law allows) @ a very pleasant 3600RPM ~ I prefer the combo not only to lower the RevsPerMinute but to lower the RevsPerMile,

there by getting more miles of use out of all those moving parts ~ like from the TimingBelt all the way through to the WheelBearings & Tires & it also 

LowersTheNose which I like to think might help the AeroDynamics just a bit ~ Maybe not much but EveryLittleBitHelps ~

        It is still a 4000lb BigSteel"ConcreteBlock" & that, in combo with the Taller4th & TallerTires, does cause it be slowed down by headwinds & the

occasional long hillclimb but those conditions probably only occur less then 1% of the time, even here in the mountainous SW & 3rd gear RedLines

around 90MPH & will cruise @ 70MPH@5000RPM all day long if need be. The lower RPMs seem to have had no impact on the MsPG that it gets pretty 

consistently ~ On SummerGas VDubaru gets a pretty consistent 22-23MPG no mater what the SpeedLimit is & I usually drive about 5% over the S'L' ~

Even with a Canoe on the roof ~ But my Canoe only weighs 40lbs & it is very AeroDynamic ~

        I live in NM @5000FtASL & most all my driving is done @orAbove that Alt' so depending on where you are you could have as much as 18% 

more Torque/HP to play with than I do ~ But that will MostLikely Lower Your MsPG a bit ~

        In addition to My Fronts&Rears being Diff'Sizes they are Diff'TreadStyles ~ The Fronts are Cooper CS4s & the Rears are Copper Discoverer AT3s ~

                                                                                                                                ORR ~ DeanB

On 15 Jul , 2015, at 9:53 PM, Loren Busch starwagen@gmail.com [wetwesties] wrote:

> 
> Okay, this wacky idea popped into my head while driving today.
> I now have a 2.3L WBX with a lot more power in my '90 Westy with automatic.  I could (but cannot possibly afford) go to a higher 3rd gear in the auto tranny, adds say it would drop the RPM at cruising speed by 800 RPM.  And thus save some gas on long highway runs. 
> But what if I did this?  Go to larger tires on the rear?  Why only the rear?  To keep the speedometer and odometer accurate.   
> Right now I am running 205/65 R 15 all around.  If I were to go to a tire with larger circumference on the rear, although loosing a little power at the ground I should drop my RPMs at cruise.
> So, is there a fault in my logic?  And would my gain be so small as to not be worth the effort?  BTW, I haven't tried to do the math on this one yet, just thought I'd throw it out.
> 
> __._,_.___
> Posted by: Loren Busch <starwagen@gmail.com>
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