Thread: Mustang?
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Old 06-16-2015, 08:31 PM   #10 (permalink)
darcane
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Quote:
Originally Posted by mcrews View Post
You need to get a scangauge. Then get out on a freeway and get rpm for 50,55,60,64,70.
and record the rpm(from the scangauge) and mpg for each.
That's going to be a challenge because...

Quote:
Originally Posted by oldschooleco View Post
Hello everyone,I picked up an 1989 mustang gt back in november.
<snip>
Heres the trick,I'm building a 351w motor for it. High flow aluminum heads,Longtube headers edelbrock cam Ect ect and a 5 speed.(400-500hp)
'89 Mustang with a 351W? There's no OBDII in 1989 and most likely the engine swap means it's carbureted now too.

Sounds to me like the OP is building a race car with outdated technology but would like modern fuel economy. Aero and gearing will help some, but mostly this is putting lipstick on a pig. Keep the car a "5.0" with a Coyote motor and a 6-speed, and you can probably hit the same power with significantly better mpg.
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