700R4 ratios

[George M. Dailey]

Gentlemen, it's official. MY TPI has actually lost about 1mpg in the city.
Highway milage aint worth bragging about either. I simply must have the best
fuel economy possible with the '89 GM 5.7L TPI system. What does the TPI
engine & ECM like as far as final drive ratio?? I'm at a loss as to why my
TPI system is not performing at it's best. Any ideas? Do I need to drop to a
lower gear ratio? Below is a engine speed vs vehicle speed data set. This is
calculated data, but it aggrees with my instruments. 2.73:1 rear end ratio
27.125" dia tires. Thanks for the data Chief!

rpm     1st 3.06        2nd 1.62        3rd 1.0         4th 0.70
500	4.829933	9.123207	14.7796	        21.11371
600	5.79592	        10.94785	17.73551	25.33645
700	6.761906	12.77249	20.69143	29.55919
800	7.727893	14.59713	23.64735	33.78193
900	8.69388	        16.42177	26.60327	38.00467
1000	9.659866	18.24641	29.55919	42.22742
1100	10.62585	20.07106	32.51511	46.45016
1200	11.59184	21.8957	        35.47103	50.6729
1300	12.55783	23.72034	38.42695	54.89564
1400	13.52381	25.54498	41.38287	59.11838
1500	14.4898	        27.36962	44.33879	63.34112 (I show 65mph at 1500rpm)
1600	15.45579	29.19426	47.29471	67.56386
1700	16.42177	31.0189	        50.25062	71.78661
1800	17.38776	32.84355	53.20654	76.00935
1900	18.35375	34.66819	56.16246	80.23209
2000	19.31973	36.49283	59.11838	84.45483
2100	20.28572	38.31747	62.0743	        88.67757
2200	21.25171	40.14211	65.03022	92.90031
2300	22.21769	41.96675	67.98614	97.12306
2400	23.18368	43.79139	70.94206	101.3458

Help'
GMD

At 02:59 PM 6/13/97 -0400, I wrote:
>>...I've wrote
>>it off to my 2.73:1 gear ratio and 27-1/8" diameter P255 60-15's. Does
>>anyone have the gear ratios for the 700R4 tranny? It seems like my gas
>>milage in the city has dropped from 13 -14 to 12-13. Dope!
>>
>>GMD
>
>Ratios are 3.06, 1.62, 1.00, 0.70.
>
>Ed Hilker aka "Chief"
>84'SS - 700R4
>
>
>
George M. Dailey
gmd at tecinfo.com