People, im so tired of reading new topics every other day about the differences between the ST GT and GT-S celicas and having to explain to each and every person the differences. So here it is. Read this before you ask any more "what is the difference..." questions.
Celica ST : 4AFE, DOHC, 16V. 105 hp, 1.6L. 4 Lug, 4 x 100mm wheels Your slow economy car. Came in the coupe model only with no power anything. Only body difference between this model and the GT coupes are the black door ding guards and mirrors. Overall the slowest celica out of the 5th generation.
Celica GT : 5SFE, DOHC, 16V, 130-135hp 2.2L. 5 lug, 5 x 100mm wheels The baseline sportscar. The GT came in either the coupe or the hatchback models. While both versions have the same engine, the coupe weighs about 100 pounds lighter. GTs usually come with power steering, windows, locks. ABS, Cruse control, alloy wheels, the System 10 sound system was an option (however rare).
Celica GT-S ; 5SFE, DOHC, 16V 130-135hp 2.2L, 5 lug, 5 x 100mm wheels. The "sportiest" if the NA celicas. The GT-S only came in the hatchback model with the flared wider finders in the front and back. Came with all power options of the GT standard, also the System 10 system is more common in these models, however still rare. Basically the GT-S could be summed up as the nonturbo AllTrac model. The gagues are different than the GT, the speedometer goes to 150 mph while the GT's only goes to 120. The GT-S's gagues also came with a battery voltmeter on the left side (where the boost gague for the AllTrac would be) one the left side of the panel where the GT only had the fuel and engine temp gagues.
As for speed, the GT and GT-S models both have the same horsepower, engine, transmission, suspension, gearing, EVERYTHING. The ONLY difference between these two models are the options the car came with and the wideness of the finders. The GT-S does not go to 140 mph, both are speed limited to 115mph. Both have the same hp rating, the same gearing, so both should run nearly the same 1/4 mile times. (by nearly i mean within .05 seconds of eachother)
Also, all the celicas did go through a body change in 92. None of the perforamce changed. The 5SFE in the GT and GT-Ss received a coilless ignition and a supposed 5hp increase, but there is no true gain between the two engines. The only thing that changed in 92 was the front bumper and rear taillights. The bumper went from a single "mouth" front bumper with foglights inside to a more open front with the foglights spearate on the sides of the opening. The rear lights got a different color layout with black or maroon dividers instead of the colors being side by side. Other than that, the years are all the same.