top speed problem

MX3KEV21 · Post by **MX3KEV21** » December 30th, 2006, 8:48 pm

can someone please help? my car when accelerating in the first three gears goes really fast then when i take forth gear to 7000rpm (takes a while) and put it into fifth gear the car will hardly accelerate struggles to get to 110mph. but if i take it to say 5000rpm in forth gear and put it into fifth the car will accelerate a bit better but can still only get 110mph within 1mile. or is that speed within that distance reasonable?

Bumpysbro · Post by **Bumpysbro** » December 30th, 2006, 11:00 pm

ive had this problem for a very long time and i still have it. very sluggish in 4th and 5th is basically dead. but the first gears go by instantly. have you checked your cat or exhaust restrictions maybe

panheader · Post by **panheader** » December 31st, 2006, 11:06 am

According to my Chilton manual, peak power is produced between 5500 and 6500 rpm (depending on whether it is a 4 or 6), so at 7000 you are actually below max HP. That could explain better pulling power when you shift at 5000. Even something as sleek as an mx-3 creates a lot of resistance cutting thru the air, and that may be the max it'll handle with the power available.

hgallegos915 · Post by **hgallegos915** » December 31st, 2006, 11:13 am

dyno the car, not for racing purposes just for diagnosic.