Hi guys n gals.
as part of the turbo conversion I am in the process of calculating the math to show performance gains on mk2 172.
Later parts will calculate ideal turbine characteristics for this engine (to be overlayed on compressor maps available from the manufacturer of the turbo (Mitsubishi), a volumetric efficiency map, and the theoretical torque and power curves that should result. most of this can be converted into theoretical performance figures.
ok.. this bit looks at a std mk2 172 running a standing quarter mile. after the standard result.. check out the results for increasing power at the wheels (flywheel est shown for those who like that sort of thing ).
It is a sobering thought isnt it.. ?.. look at the power increases you need to bring the times down a fraction..
Now you know why you find it easy / hard to keep up with / pull away from both cars with lesser power to weight ratio and greater power to weight ratio..
Enter the world of the harsh realities of performance tuning lol...
(do you still want that induction kit and exhaust ?)
145 bhp @wheels (est 177.2 @flywheel) , 15.628 s, 87.221 mph
155 bhp @wheels (est 189.4 @flywheel), 15.284 s, 89.181 mph
165 bhp @wheels (est 201.6 @flywheel) , 14.969 s, 91.059 mph
175 bhp @wheels (est 213.9 @flywheel), 14.678 s, 92.863 mph
185 bhp @wheels (est 226.1 @flywheel), 14.409 s, 94.599 mph
195 bhp @wheels (est 238.3 @flywheel), 14.158 s, 96.274 mph
205 bhp @wheels (est 250.6 @flywheel), 13.924 s, 97.892 mph
215 bhp @wheels (est 262.7 @flywheel), 13.705 s, 99.459 mph
225 bhp @wheels (est 275.0 @flywheel), 13.499 s, 100.98 mph also = (0-100 in 13.5 seconds)
235 bhp @wheels (est 287.0 @flywheel), 13.304 s, 102.45 mph
245 bhp @wheels (est 299.4 @flywheel), 13.121 s, 103.88 mph
255 bhp @wheels (est 311.7 @flywheel), 12.947 s, 105.28 mph
My ultimate aim with a sutable compressor wheel / housing is apx 230 bhp at the wheels for the turbo 172.