MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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Citron
Stephen DeGroat
Lugoff, SC
(367 posts)

Registered:
10/23/2007 09:43PM

Main British Car:
1970 MGBGT V6, 7004R, AC, matching trailer 3.1 liter

3.9 to3.0
Posted by: Citron
Date: May 19, 2010 01:27PM

I changed from the stock rear end to a narrowed ford 8 in with a 3.0 gear.
Car: 70 BGT
Engine: 3.1 with a carb
Trans: 700R4
Tires: 205/75/14
Car has AC

I ran the 0 to 60 times with a G-Tech meter on the same road both times. Two run South and two runs North.
First two 0 to 60 runs are South: Last two are North

3.9 gear:
0 to 60 : 7.66: 7.42: 8.01: 8.00: AVE:7.77
Speed at 2666.66 rpm was 71 to 72 mph(GPS)

3.0 gear:
0 to 60: 8.3: 8.35: 8.50: 8.55 AVE:8.43
70 MPH is 1900 again with the GPS.

I used .66 more seconds to reach 60.
I don't consider that a bad trade for the redueces noise and heat with the 3.0.

Steve


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1165 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: 3.9 to3.0
Posted by: ex-tyke
Date: May 19, 2010 09:43PM

Thats what happens when you live in the Northern hemishere, the last 2 runs, going North, are uphill.


MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: 3.9 to3.0
Posted by: MGBV8
Date: May 20, 2010 03:57PM

Hill, what hill?!

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Citron
Stephen DeGroat
Lugoff, SC
(367 posts)

Registered:
10/23/2007 09:43PM

Main British Car:
1970 MGBGT V6, 7004R, AC, matching trailer 3.1 liter

Re: 3.9 to3.0
Posted by: Citron
Date: May 20, 2010 07:44PM

It does seem like the road was down hill to the south and up to the north, though you wouldn't know it to look at it.

Steve


kstevusa
kelly stevenson
Southern Middle Tennessee
(985 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: 3.9 to3.0
Posted by: kstevusa
Date: May 21, 2010 07:56AM

Steve, it is geographic. Over here is middle Tn, the land slopes to the west, Mississippi River. I do not know why the Tornadoes all come from the southwest, guess they don't like to travel directly uphill.
Have a Safe Trip and see you in Indy!


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