HiTempguy wrote:
Mr_Clutch42 wrote:
How do you get it to achieve 30mpg?
You don't. GRM people have a bad habit of not being able to calculate true mpg
umm, really? first off, i'll acknowledge that you did post a smiley, indicating this was a tongue in cheek statement. however, you clearly don't know me or my cars, so please feel free to shove your generalized ignorance up your pompous ass. second, and the answer to the mans question of about how you achieve 30 MPG, is a three part answer.
first, the TC, and all aero Thunderbirds from 83-88, are indeed slippery cars, with (i think) a .67 drag coefficient. they are right off of the factory floor perfectly capable of 27 MPG highway, 25 in town if driven with a light foot. they also have a very high OD in the manual transmissions, something like a .67 or .68, mated with a 3.55 rear gear. cruising speeds of 70-75 are at about 2100 RPM, which is very low for 2.3 liters.
second, its a 9.45:1 compression engine. so if you leave the turbo alone, and keep the engine in a state of vacuum, (aftermarket boost/vac gauges help with this) the mileage is very good from the factory.
third, i add an adjustable FPR, and modify the VAM (mechanical version of a MAF) and TPS setting (adjustable in these cars), and i can get as high as 33MPG highway, and 27-29 in town. i usually install a wideband 02 meter, and try to get as lean as i can manage without melting the plugs or overheating the manifold/turbo during cruise/idle run time. this nice thing about this setup, is as soon as i tip in boost for power, the AFR returns to a nice 11.0:1 and i don't have to pay the price of MPG with lost HP. all the factory HP is still there. i have done this with three of these cars in the past, this will be my fourth. BTW, these are real world, long distance calculations being backed up by the factory Ford tripminder which displays MPG by the tank and by the trip.
thanks for your bias and useless input though, M_C42.
-J0N