Lexus IS Forum banner

1 - 11 of 11 Posts

·
Registered
Joined
·
492 Posts
Discussion Starter · #1 ·
i was just browsing and s2k forum with a friend of mine and i came upon a thread that claimed the IS had a drag coefficient of .29. this seems very good. ive never seen this discussed b4. does anyoneknow if .29 is right?
 

·
Registered
Joined
·
2,197 Posts
Gosha16 said:
i was just browsing and s2k forum with a friend of mine and i came upon a thread that claimed the IS had a drag coefficient of .29. this seems very good. ive never seen this discussed b4. does anyoneknow if .29 is right?
Yes, it is correct. I believe it's even in the IS brochures (at least for the '01s). I haven't tested it myself, of course, but it's widely agreed to have been tested at .29...very good for this class of car.
 

·
Premium Member
Joined
·
52,610 Posts
It's better than lots of cars, especially anything pre year 2000. Most are 0.33 up to 0.41.

Table 5: Drag coefficients for some passenger vehicles

VW Polo (class A) 0.37
Ford Escort (class B) 0.36
Open Vectra (class C) 0.29
BMW 520i (class D) 0.31
Mercedes 300SE (class E) 0.36




Table 6: drag coeffs of other systems

Wires and cables 1.0 - 1.3
Empire State Building 1.3 - 1.5
Eiffel Tower 1.8 - 2.0
 

·
Premium Member
Joined
·
52,610 Posts
Table 3: drag coeffs for transport systems

Subsonic Transport Aircraft 0.012
Supersonic Fighter, 0.016
Airship 0.020-0.025
Helicopter Download [4] 0.4-1.2
Sports Car 0.3 -0.4
Ecomony Car 0.4 -0.5
Pickup Truck 0.5
Tractor-Trailer, with fairings 0.6-0.7
Tractor-Trailer 0.7-0.9
Trailer alone 0.9
Racing Car [5] 0.65-1.10
 

·
Registered
Joined
·
12,157 Posts
one thing you aren't taking into account is tire width, the supras tires are much wider than the IS's tires, and that plays a big part. put supra tires on an IS and see if the coefficient doesn't increase

-gte
 

·
Registered
Joined
·
5,654 Posts
So...

The lower the number the better...right?
 

·
Registered
Joined
·
12,157 Posts
yes sir, thats why mustangs buy those pizza cutters and drag race with them (usually its very premature and they are putting them on 13 second cars, but i guess it is almost like people stealing our taillights or the park bench wings on 16 second fwd cars)

-gte




redline814 said:
So...

The lower the number the better...right?
 

·
Registered
Joined
·
3,155 Posts
redline814 said:
So...

The lower the number the better...right?
not necessarily...
downforce is also important but downforce is almost exact opposite of Cd.
Enzo, for example sacrificed Cd to get more downforce.
when Ferrari built the damn thing, they knew they couldnt beat McLaren F1 in top speed. so, they designed the enzo to have better acceleration.

BUT, dont think that if the car has high Cd it automatically has high downforce.
some cars have high Cd for no reason (either the engineers dont care about Cd.. or they f'ed up)
 
1 - 11 of 11 Posts
Top