700R4 ratios

[peter paul fenske]

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
>
>