Date: Wed, 15 Jul 2015 22:50:42 -0600
Reply-To: OlRivrRat <OlRivrRat@COMCAST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: OlRivrRat <OlRivrRat@COMCAST.NET>
Subject: Re: [WetWesties] Crazy Idea On Mismatched Tires
In-Reply-To: <CAH32RNY=rA16UTOzKr2qpa-zts88_xpgHP9-bQBivz3wMtRKSw@mail.gmail.com>
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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.
>
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> Posted by: Loren Busch <starwagen@gmail.com>
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