700R4 ratios

[dzorde]

Well, my 350 TPI Monaro (roughly 4000lbs) gets 13mpg in the city and 28mpg
in the country. On the race track (as I found out last Saturday, circuit
racing), the milage dropped to just under 4mpg.  Quite a wide range I think.
This car is running 14" 265/50 tyres, with 3.08 rear end and Toyota Supra 5
speed, timing is 4deg BTDC on 100 octane leaded to stop pinging (at 7deg
BTDC it will ping).

I don't feel so bad now about the economy after reading what others get.

Dan     dzorde at geocities.com
  
>Hi George
>
>It is a 4200 Lbs 85 GMC PU 2whl drive with
>3.08  P235/15 mich radials..and yep the
>gas mileage stays at 20MPG now that is imperial ..
>
>Make sure your knock sensor works.. Ie don't carry it
>too far..With the stock chev cam this is prob too
>much advance, with the performer cam it is ok..
>
>Everything is kinda complicated..
>
>Ps you guys who use the #165 ECM with TPI should be
>giving STEVE at TTS a call.
>His package would be ideal for this..
>
>CYall:peter
>
>Ps does anyone know how to use a ASTRA scanner. gRRRRRRR
>
>At 06:43 PM 7/17/97 -0500, you wrote:
>>Well, it seems as if the EFI SBC delivers a wide range of fuel economy 12 -
>>25mpg. I like Peter F's milage, so I'm going to adjust the timing to 14
>>deg,. BTDC. What is the provable milage that the '89 TPI cars could
>>routinely achieve? BTW Pete, what's your tire size and gear ratio? It may be
>>time for me to change.
>>
>>Tom C. asked, "did the mpg drop occur suddenly or gradually ??  remember that
>>a worn engine is less efficient and will get less mpg as
>>it ages"
>>
>>It dropped right after I replaced my 350HT with the 700R4. No other changes
>>period. No new big boned gilfriend, no doubble rations of food.
>>
>>It's strange that some people get 20mpg routine and others think "Not even
>>the factory
>>thinks they get 15MPG city/ 24 MPG highway." I have noticed that those that
>>get the high milage swear by it as do those with the gas hoggs. The truth is
>>an elusive quarry! Could the differences be due to just a few small things
>>like a highly tuned EFI system? Back when I ran carbs, everybody got 8mpg
>>city and 12 highway with a SBC and that's all I have to say about that.
>>
>>Thanks for the input gentlemen, I'll let you know what the timing does.
>>
>>GMD
>>
>>
>>At 10:02 AM 7/16/97 -0500, you wrote:
>>>
>>>>> yeah, but a '93 Continental doesn't weigh 5600 pounds dry,
>>>>> like my '95 'burban with TBI and it probably doesn't have
>>>>> a 350 CID engine.  I'm running 16" tires and 3.73 rear end.
>>>>> It's 4WD also.  I record every drop of petrol that goes into
>>>>> it and after 40,000 miles, many on good highway runs, I'd
>>>>> love to know how to get 15 mpg
>>>>> 
>>>>
>>>>My 88 Chevy fullsize p/u has the same gears and really tall tires.  I get
>>>>17 or better on the highway -- have sen 22 - and 12 to 15 around town.  
>>>
>>>we're probably straying slightly from the forum content,
>>>but 5600 pounds weighs more than your pu loaded to its
>>>max (assuming it's a 1/2 ton) -- 4000# + 1000# = 5000#.
>>>Imagine what mpg you'd get if you drove it fully loaded
>>> ** all the time **  ..... and then add 600 more pounds,
>>>plus occupants ... and other paraphernalia -- up to another
>>>1/2 ton [the 'burban weighs 5600# ... dry, no fuel, no
>>>occupants, no nothing -- not even floor mats  ;-)  ]
>>>
>>>Tom Cloud <cloud at peaches.ph.utexas.edu>
>>>
>>>
>>George M. Dailey
>>gmd at tecinfo.com
>>
>>
>
>