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Old 09-17-2013, 09:13 AM   #1
ApolloTheGod
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top speed of e46 chassis

So I am just curious here and its been a while since I have had an E46, but have any of you seen any wind tunnel tests with the E46, specifically a sedan? I am trying to figure what safe speeds are for the chassis and any mods I will have to do
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Old 09-17-2013, 11:37 AM   #2
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Mach 3 is the top end due to drag
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Old 09-17-2013, 11:38 AM   #3
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Old 09-17-2013, 11:43 AM   #4
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Originally Posted by ApolloTheGod View Post
So I am just curious here and its been a while since I have had an E46, but have any of you seen any wind tunnel tests with the E46, specifically a sedan? I am trying to figure what safe speeds are for the chassis and any mods I will have to do
Threads like these are just so filled with pregnant pauses and unexplained background and comedy factors that I can't even explain it.

What the heck speeds are you thinking you are going to exceed that are dictated by the CHASSIS and the WIND TUNNEL tests......I mean are you planning to set the world land speed record out on the Bonneville Salt Flats or something with your 10yr old 325i?

And therefore what MODS are you envisioning for your project?
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Old 09-17-2013, 11:49 AM   #5
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Threads like these are just so filled with pregnant pauses and unexplained background and comedy factors that I can't even explain it.

What the heck speeds are you thinking you are going to exceed that are dictated by the CHASSIS and the WIND TUNNEL tests......I mean are you planning to set the world land speed record out on the Bonneville Salt Flats or something with your 10yr old 325i?

And therefore what MODS are you envisioning for your project?
I believe this is the guy swapping in his n54. Although I kind of agree wouldn't the transmission top out before wind drag becomes an issue? I mean you can push a cube to 200 mph if you have enough power.

Edit: Also air density plays a role, the most definitive answer to your question is the top speed is C.

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Old 09-17-2013, 11:51 AM   #6
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Old 09-17-2013, 11:56 AM   #7
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If you ever intend to go beyond around 150-ish even on a track, I'd highly recommend a roll cage at the very least. Start creeping up on 170 or so and you should be considering a functional splitter (not the cosmetic ones you mostly see here) and a proper rear wing. Of course you also will need the suspension and brakes to back that up, especially once you put a wing on it. A functional rear wing + too soft of a suspension and you'll just make the car squat, lift the nose, and negate a huge chunk of the aero benefit.
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Old 09-17-2013, 12:03 PM   #8
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I believe this is the guy swapping in his n54. Although I kind of agree wouldn't the transmission top out before wind drag becomes an issue? I mean you can push a cube to 200 mph if you have enough power.

Edit: Also air density plays a role, the most definitive answer to your question is the top speed is C.
I guess people gotta have their hobbies! I'd think the chassis and shape of the E46 can handle high speeds, while the engine, transmission, suspension, etc will be the limiting factors.
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Old 09-17-2013, 01:33 PM   #9
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I need more NOS, my car topped out at 140 today
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Old 09-17-2013, 01:50 PM   #10
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I need more NOS, my car topped out at 140 today
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Old 09-17-2013, 01:59 PM   #11
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Originally Posted by Tangent_ View Post
If you ever intend to go beyond around 150-ish even on a track, I'd highly recommend a roll cage at the very least. Start creeping up on 170 or so and you should be considering a functional splitter (not the cosmetic ones you mostly see here) and a proper rear wing. Of course you also will need the suspension and brakes to back that up, especially once you put a wing on it. A functional rear wing + too soft of a suspension and you'll just make the car squat, lift the nose, and negate a huge chunk of the aero benefit.
Yeah that part was obvious but I am curious as to the best functioning splitters. In my experience a splitter is needed at 180 and a wing is needed at around 150, at least for the power I was pushing. I also need aerodynamic sideskirts that are extremely low to the ground to hold the low pressure underneath the car. I know I need a custom rear diffuser and a generally flat undercarriage.

Quote:
Originally Posted by TheDeadner View Post
I believe this is the guy swapping in his n54. Although I kind of agree wouldn't the transmission top out before wind drag becomes an issue? I mean you can push a cube to 200 mph if you have enough power.

Edit: Also air density plays a role, the most definitive answer to your question is the top speed is C.
Air density and gears yes. The 308 gears I had gave me a non achievable top speed of 218 mph. damn you wind! The 3.62 from the M3 LSD should still be over 200. If it is an issue ill change up gears. I honestly havnt even done le maths.

Quote:
Originally Posted by Hogan773 View Post
Threads like these are just so filled with pregnant pauses and unexplained background and comedy factors that I can't even explain it.

What the heck speeds are you thinking you are going to exceed that are dictated by the CHASSIS and the WIND TUNNEL tests......I mean are you planning to set the world land speed record out on the Bonneville Salt Flats or something with your 10yr old 325i?

And therefore what MODS are you envisioning for your project?
Good thing I am not driving a 325! that would take tons of money to make that happen lol

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