What's wrong with slamming an Evo X?
 

Hey guys, E92 335i owner here. Seriously considering an Evo X. The potential for power on your platform is intriguing, and I absolutely love the body style. My E92 is slammed, and if I do get an Evo X, I would like to also slam it. Yes, I know, a lot of you don't like that look, it's not good for the track, impossible to get around, etc etc... However, to each their own.

I did use the search function to find the answer I was looking for, to no avail. I would just like to know if slamming an Evo X is a viable option. A friend of mine with an 11' GSR told me that it would be almost impossible because the exhaust hangs too low. Are there ways around this? What other issues would I run into, other than obviously scraping on everything? Thanks in advance for all the help, I really appreciate it.


For any of you who are interested, this is my E92.

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Looking at this, I don't think the exhaust hangs too low.
http://4.bp.blogspot.com/-jSJRDh2gjh...s950/evo+x.jpg

Not trying to be a jerk but if you're going to slam it, then the power potential is kind of a moot point.

That car is gorgeous! I believe my friend meant it hangs too low near the undercarriage of the car.

No worries, no offense taken! You can drive fast in a low car, you just have to know the roads. If you haven't been in a certain area before, you don't want to be going anywhere above the speed limit, that's for sure.

evo x is not "slam" friendly ..the front sub frame hangs way to low..the rear will be alright

Getting an Evo with the Aero kit (larger lower front lip, side air dams) will give you an even lower look without it actually being lower too. Possibly a different rear bumper or diffuser too.
Those things in combination with a 2" or more drop and some wheels with agressive offset would give you the look you are going for I think.

Good example here of what's possible:
https://www.evolutionm.net/forums/ev...nce-evo-x.html

Some good examples of slammed X's:
https://www.evolutionm.net/forums/ev...o-x-style.html

If you really did search and never came across "roll center," then your search skills need work.

I do commend you on your grammar, spelling, and prose, though.

To answer your question, yes you can slam it. It does rather negate the power though, as you can only use it under very limited circumstances. If you're in to the look, it can be done, it has be done, and plenty of others will support your endeavors.

I would rather body kit it and keep it a little higher for proper handling -- then you can look slammed and still drive a bit more spirited.

Exactly. In short, by 'slamming' the car you are moving the suspension too far from it's designed operating point. When 'slammed', the roll center ends up far away from the center of mass. The roll center is a virtual geometric point determined by the suspension geometry that forms a virtual moment arm, the size of which determines how much the vehicle rolls when cornering.

In other words, by 'slamming' the car you are making it more prone to body roll in the corners. It's counter-intuitive to a lot of people, but the effect is absolutely real.

But it gets worse. The roll center isn't a static point, because your suspension geometry changes as the body rolls. Your roll center, in turn, will move as the suspension geometry changes. This moving roll center and the static center of mass combined with cornering forces determine the body roll and load transfer at the tires. When slammed, the roll center can move all over the place as the suspension loads and unloads, which means the virtual moment arm which determines your body roll is actually changing wildly while the car is settling into a turn. Think of it like the car trying to find steady-state cornering and suspension loading, when the steady-state cornering keeps changing wildly as the car tries to settle into it. It makes for an unstable car with poor turn-in.


In short: Slamming the Evo is one of the single worst things you can do for the handling of the car. It's not about scraping your exhaust or subframe on the pavement, and it's not about the forum not liking how it looks. It's just a terrible thing to do to an otherwise pretty good suspension geometry. Much like unreasonably loud exhausts and cheap body kits, it makes a statement to those in the know that you care entirely about form over function. The Evo isn't the only platform that has this issue, by the way.

Every now and then, a thread becomes accurate and technical before moving to the second page. If it weren't for said threads - coupled with the fact that it is very hard to extinguish a behavior that was established by a varied schedule of reinforcement - I'd have been gone long before now.

Thanks, Construct.

Maybe you could reach out to this guy: https://www.evolutionm.net/forums/ev...nce-evo-x.html
If you do end up getting an Evo, have fun and good luck!

Much to any performance minded gearhead's dismay, I don't think the OP or anyone else that slams a car or does other equally silly things to enter into car shows cares about handling performance.

I really want to slap the s**t out of anyone that slams or puts hydraulics on a car, and personally think it's an abomination to such an amazing car like an Evo, but like he said in his first post "to each their own" so I'll cut a little slack :) All suspension travel and roll center be damned!

Thanks for the info!

Personally, I'm more interested in getting rid of wheel gap than getting the front bumper super low. Actually, it's easier to drive with a front bumper that sits high, which is why I don't like big lips / front bumpers. They're very easy to destroy.

I actually reached out to 1LLEST via PM before making this thread. His car is absolutely gorgeous. Thanks for the advice!

Why thank you, kind sir. If catholic school is good for anything, it's grammar and spelling.

Good point, tkromer.

Awesome info, thanks for taking the time to type that up. You are absolutely right, slamming it does kill your handling ability, I've experienced it in my E92.

I agree with you, I was certain I would be flamed within the first few posts, however this thread turned out to be very beneficial to me, and hopefully to more people in the future. If I had posted this same thing over on E90post.com, who knows what madness might have ensued.

I actually did PM him before I made this thread, thanks for the idea though! If I do get the Evo, I'll certainly be back to evolutionm to document its progress.

You've hit the nail on the head, sir. My E92 has never seen a track other than the 1/4 mile, and likely never will. After a lot of reading around here on evom, I'm actually considering just a moderate drop with a huge turbo :D. Of course, I would have to pick up a cheap daily, perhaps an MR2, that would most definitely be slammed.

Just get 20s and it'll eliminate that wheel gap! J/K, Construct hit the nail on the head, winner winner!

But like you said, if you don't mind killing the handling and don't mind the flames from other members, it's your damn car do what you want - I just wouldn't do it :)

Man, I like you a lot, but the above hurt. I owned the 7th MR2 in North America - even met it at the boat - and the idea of slamming that car is quite painful. Hopefully, you meant a 2G or younger - as in a real MR2 that has been dead for a few days at the side of the road and puffed up because of the gasses that have accumulated in the digestive tract.