Quote:
Originally Posted by mystere485
245/45/18 to 255/45/18 changes the width not the height
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REALLY!!!!!!
WOW, 
and to think I've been telling everybody the wrong thing for 4 years, 180,000 miles and 4 sets of tires!!! 
oh.........btw....................you're just a little bit wrong. 
Since 245 is the stock factory tire and 255 the tire I run.....oh and you can read any of my posts and see that I only refer to the advantage of ther one size up tire EVERY time as a key reason for my mpg.
AND I have used a Garmin 360 Nuvi to acuratly calculate my miles on long trips to ACCURATELY document the REAL miles and TRUE MPG
BUT here is the chart from TIRERACK.com on the Kumho's that I run.....
size 245/45ZR18 255/45/18
max psi 50 psi 51psi
tread depth 11/32" 10/32
weight 30lbs. 30lbs
rims 7.5-9" 8-9.5
overall width 9.6" 10.1
tread width 9" 9.3
diameter 26.7" 27”
rev per mile 778 769
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"Active ride height that lowers the vehicle at speed, which Ford employed on the Lincoln Mark VIII and which appears on Mercedes-Benz vehicles with Airmatic suspensions. According to Mercedes, "Lowering the ride height at speed results in a 3-percent improvement in drag." Car Aerodynamics 101
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I didn't know he was buying a Mark VII??????
Or a Mercedes???????
Let's stick to the topic. 1994 crown vic. Not a BRAND NEW car with active suspension being tested.
1. the 1994 is probably already 1/2 inch lower than new factory. So the point becomes moot.
2. But before you have him reuild the front rubber, you want him to lower it.
3. Since I was talking about HIS EXACT RIDE and not some $10k active suspension that he can't get and has NO bearing on the disscussion, I'll stand by my points.
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I understand that; anti-roll bars, shock rates, and camber adjustments should be taken into account when modifying springs as well.
Because of the saggy springs no doubt!
A front air dam and belly pan is in the plans.
Fud2468, sorry for hijacking your thread.
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When the day is over, ABA testing on the crown vic w/ one size up on the tires WILL show and improvement in mpg. period.
The 'lowering and crapping" of the suspension may or may not.
But he will be stuck with the altered ride.
THe facts are very simple when done apple to apple.