You got my question backwards. By using smaller tires (which I already
am), I am EFFECTIVELY raising the rear end ratio from the original 3.90
to near 4.11. I want to put in the 3.70 rear end, which with smaller
than stock tires (195/50/15 are actually smaller than stock) will
effectively put me back near the stock 3.90.
Adam
--- "Patrick P. Castronovo" <slick1@mohaveaz.com> wrote:
> What I meant is if you wanted to see what you would in essence be
> doing, is
> to "TRY" using 2 rear wheels in the 13" rim and tires.(Corvair will
> fit)
> then you will see for yourself with smaller tires, you will go
> SLOWER, and
> if you go to a 4.11 rearend, you will go slower still.
> PAT
> -----Original Message-----
> From: Adam Bradley <ambradley@yahoo.com>
> To: Patrick P. Castronovo <slick1@mohaveaz.com>;
> datsun-roadsters@autox.team.net <datsun-roadsters@autox.team.net>
> Date: Wednesday, February 07, 2001 7:10 PM
> Subject: Re: Rear End (was Re[2]: EFI / custom engine)
>
>
> >No, I want BIGGER rims, not smaller! But I could get some 13x10
> >positive offset gold wire wheels and some really small tires - cool!
> >
> >But seriously, is that a YES to changing the rear end to give me a
> >better freeway speed driveability/mileage?
> >
> >--- "Patrick P. Castronovo" <slick1@mohaveaz.com> wrote:
> >> before you go into the expense of changing your rear end, try
> >> dropping to a
> >> 13" tire, and you will see the difference using a higher geared
> >> rearend will
> >> feel like.(411) You will have a faster pickup, but your top end
> and
> >> your
> >> Gas Mileage will suffer. Pat
> >>
> >> -----Original Message-----
> >> From: Adam Bradley <ambradley@yahoo.com>
> >> To: datsun-roadsters@autox.team.net
> <datsun-roadsters@autox.team.net>
> >> Date: Wednesday, February 07, 2001 5:46 PM
> >> Subject: Rear End (was Re[2]: EFI / custom engine)
> >>
> >>
> >> >About the different rear end, I've got a '70 1600 with 195/60/14
> >> tires.
> >> > I plan to replace these with 195/50/15, which is actually a
> >> fraction
> >> >of an inch smaller in outer diameter than 195/60/14. It was
> >> suggested
> >> >to me that I might want to replace my 1600 rear end with a 2000
> rear
> >> >end, as the lower tires turn my 3.90 into more like a 4.11,
> reducing
> >> my
> >> >top speed and increasing RPMs at a given speed. Any thoughts?
> >> >
> >> >Adam
> >> >1970 1600
> >> >1967 1600 (probably sold this Saturday)
> >> >
> >> >--- Fred_Katz@ci.sf.ca.us wrote:
> >> >> Pat,
> >> >>
> >> >> You just can't compare an Altima to the roadster. Apples vs.
> >> Oranges!
> >> >>
> >> >> My '66 2000 cruises between 4000 and 4500 rpm at highway
> speeds,
> >> and
> >> >> I'm
> >> >> getting about 26 mpg. I've got the 1600 rear end (3.90?). In
> city
> >> >> driving,
> >> >> stop and go, the mileage drops below 20 mpg, where the tach is
> >> often
> >> >> at
> >> >> 3000 (peppy!). Lower rpms do NOT guarantee consuming less
> >> gasoline.
> >> >> And I
> >> >> know quite a few of the other BADROC'rs are getting similar
> mpg,
> >> >> about 24
> >> >> to 28 mpg on the highway.
> >> >>
> >> >> Fred - So.SF
> >> >> BADROC
> >> >>
> >> >> ______________________________ Reply Separator
> >> >> _________________________________
> >> >> Subject: Re: EFI / custom engine
> >> >> Author: "Patrick P. Castronovo" <slick1@mohaveaz.com>
> >> >> Date: 2/7/2001 1:20 PM
> >> >>
> >> >>
> >> >> 3800 RPM on the Highway is consuming a lot of Gasoline. My '98
> >> >> Altima gets
> >> >> 27 on the highway and it is turning at 2200 RPM @ 60 mph. You
> >> must
> >> >> be at
> >> >> about 20 MPG. I know my roadster(67.5 2000 w/Solex) gives me
> 30
> >> MPG
> >> >> on the
> >> >> highway. I don't know the Ratio.
> >> >> Pat.
> >> >> -----Original Message-----
> >> >> From: Daniel Neuman <dneuman@quark.sfsu.edu>
> >> >> To: slick1@mohaveaz.com <slick1@mohaveaz.com>
> >> >> Cc: Erickson Philip <philip.erickson@Agouron.COM>; "ROADSTER
> >> >> (E-mail)"
> >> >> <datsun-roadsters@autox.team.net>
> >> >> Date: Wednesday, February 07, 2001 12:04 PM
> >> >> Subject: Re: EFI / custom engine
> >> >>
> >> >>
> >> >> >Hello,
> >> >> > I have the 4.11 LSD on my Solex U-20, I really don't think it
> >> makes
> >> >> >that much of a difference in around town gass mileage. On the
> >> >> freeway I am
> >> >> >turning maybe 3800rpm at the super fast CA freeway cruising
> >> speeds.
> >> >> > But I do think that it makes a difference in low rpm power.
> The
> >> >> >car really does feel more peppier.
> >> >> > Daniel 69 2000
> >> >> >
> >> >> >> I would think that using a 4.11, or 4.38 Rear End would be
> >> great
> >> >> for the
> >> >> >> track, but for the street application it would be revving
> high,
> >> >> and on
> >> >> the
> >> >> >> Highway it would reduce your top end and severely affect
> your
> >> Gas
> >> >> Mileage.
> >> >> >> But hey! I know all you roadster owners are Independently
> >> Wealthy,
> >> >> So
> >> >> what
> >> >> >> the hey! Go for it. Pat
> >> >> >> -----Original Message-----
> >> >> >> From: Erickson, Philip <philip.erickson@Agouron.COM>
> >> >> >> To: ROADSTER (E-mail) <datsun-roadsters@autox.team.net>
> >> >> >> Date: Wednesday, February 07, 2001 8:17 AM
> >> >> >> Subject: EFI / custom engine
> >> >> >>
> >> >> >>
> >> >> >> >Ronnie said "Looks to me like a blueprinted bottom end with
> a
> >> >> >> >mildly ported head with careful cam selection, around 9.5
> or
> >> 10
> >> >> to 1 CR
> >> >> >> >and EFI, along with a 4.11 or 4.38 rear end would be a
> killer
> >> >> combination"
> >> >> >> >
> >> >> >> >my sentiments exactly , I guess I should have kept my
> fingers
> >> >> quit.
> >> >> <grin>
> >> >> >> >
> >> >> >> >Philip Erickson
> >> >> >> >San Diego Calif. 92121
> >> >Yahoo! Auctions - Buy the things you want at great prices.
> >> >http://auctions.yahoo.com/
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