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10-28-2015, 07:35 PM | #1 |
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Suggested Mods for autocross
My 2006 Z4M will be my 4th car to autocross, a couple of Mustangs and an STi previously.
I am looking for suggestions on hardware upgrades (primarily Suspension). I know this car is pretty good stock and I not looking to burn a bunch of cash nor Compete Nationally. I will be ordering some Apex Arc 8's 18 x 8.5 / 9.5. to get rid of those heavy stock beasts. I don't want to get into rubbing or rolling fenders. Any other conservative wheel size combinations suggested? What about front and rear stabilizers bars, Coil overs (that won't break the bank) and/or springs. If I have to choose between comfort of ride and 1/2 second at AutoX, I'll always choose comfort! (my wife loves driving this car too!) Thanks for any input |
10-28-2015, 08:13 PM | #2 |
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Before you make any mods or even any tire/wheel changes, you need to figure out who you're going to autocross with and what class you want to run in. As an example, the SCCA is pretty restrictive on wheels if you're going to stay in Street class, you can change diameter +/- 1" but you can't increase the width at all.
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10-28-2015, 09:43 PM | #3 | |
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However, I'm not really concerned about what class I run in. I intend to mod as I like and run in what ever call I end up in. If a Mod will improve handling with reasonable cost and not degrade the Daily Driver aspect, I'm likely to do the Mod despite its consequences to the class I run in. |
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10-28-2015, 10:00 PM | #4 |
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I personally suggest you stick within the Street Class, as any other mods will bump you to an competitive class. And whether you say it or not, you will not enjoy it once you see yourself getting beat.
You can get dual adjustable suspension that can adjust rear rebound/compression on OEM Perches, so you won't compromise daily driving. Exhaust, 17x8 and 17x9 wheels on a 245/275 setup. Exhaust and front swaybar. Trust me, been here done that. Tried to mod my 128i for STX and make it a daily driver, didn't happen. I have headers and an exhaust that rattles the cabin, springs that makes the car ride rough, Recaro seats...etc etc. |
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10-28-2015, 10:40 PM | #5 | |
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Regarding not enjoying getting beat; it may provide insight knowing my first autocross vehicle was a 2001 V6 Mustang convertible, ( G Stock) possibly the worst AutoX platform to start from of any. When I added a Cold air intake I went into STX. 3200 LBS, 167 hp to the wheels and a live axel with no panhard par and I still had a ton of Fun. There is always a "meathead" in every class with a ton of car and no driving skill that is fun to beat! I'm looking forward to throwing around the Bimmer, in any classification Do you have a brand of 2-way Coilover you would recommend? I'm not inclined to spend $3K on a KW or TC kline set up. Is the H&R set up for $1,200 an improvement over stock? I may be willing to spring for $1200 (Pun intended) Last edited by Bossdog; 10-28-2015 at 10:55 PM.. |
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10-29-2015, 08:29 AM | #6 |
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So...you're looking to mod for mod sake, not for autocross sake.
In that case, it's all about what you want to spend, not what you want to achieve. IF that is the case, you picked a very poor chassis. Because if you don't want to spend a lot, you won't get a lot on this car. There's nothing you can spend south of $3,000 that will be a significant enough improvement over stock to justify it, IMO. You wanna go have fun and toss the car around? The MZ4 Coupe is far more "toss-able" in bone stock mode than $1,200 worth of coil-overs will give you in return.
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10-29-2015, 08:29 AM | #7 | |
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I run TCKline. Honestly a 2-way is going to be pimp money. I don't know if there are any single adjustable shocks that can be used with OE Perches, at least a couple years ago that wasn't the case. I have no experience with H&R. |
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10-29-2015, 08:31 AM | #8 | |
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Front bar, RE-71Rs and it'll be a hoot. |
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10-29-2015, 07:51 PM | #9 | |
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Thanks for everyone's input! |
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10-30-2015, 06:25 AM | #10 | |
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After that there is no Street Touring Classing for the car, as production model is low...and it goes into BSP IIRC to die against the other cars in that class. At that point you're cutting fenders and ripping out AC Have fun. The new crop of street tires are insane compared to last year |
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10-30-2015, 08:58 AM | #11 | ||
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For some unfathomable reason the SCCA thinks all Z4's are equal in Street class and everything from the 2.5 to the M are all packed into B Street, but for Street Touring they exclude the M so B Street Prepared is the next available class. Quote:
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Last edited by dc_wright; 10-30-2015 at 09:34 AM.. |
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10-31-2015, 02:29 AM | #12 | |
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I will definitely get the camber shims and front bar. As for the 71's, they are more noisy, more harsh, don't last as long and are more expensive than the 11's. For me, the added performance the 71's bring are not worth all the trade-offs. Thanks for your input though, very helpful! |
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11-01-2015, 07:53 PM | #13 | |
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11-01-2015, 09:15 PM | #14 |
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The price difference between the 11's and 71's on the staggered set is only about $35 at the Tire Rack. If I was the only person driving this, I certainly would get the 71's. However, I have to make my wife happy too. What about the noise and harshness? If mama's not happy, I will certainly regret it!
Last edited by Bossdog; 11-02-2015 at 05:13 AM.. |
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11-02-2015, 09:47 PM | #15 | |
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11-03-2015, 10:40 AM | #16 | |
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Ahh, First world problems! |
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11-17-2015, 09:29 PM | #17 |
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Camber has been a major issue for me and I think most people who autocross this platform. I would STRONGLY recommend some camber plates and/or camber bolts. -3 degrees seems to be the trick, along with some wider front tires. Next season I plan on running a 265/35/18 up front with around 2.5 to 3 degrees of negative camber.
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11-18-2015, 07:21 PM | #18 | |
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What size rims are you putting those 265/35's on? Last edited by Bossdog; 11-18-2015 at 07:27 PM.. |
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11-18-2015, 09:35 PM | #19 | |
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11-19-2015, 05:10 PM | #20 |
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I just received a set of Apex Arc 8's from the recent group buy. I think I will use the tire sizes you noted above. I am looking forward to autocrossing this vehicle for the first time in the Spring.
Last edited by Bossdog; 11-20-2015 at 08:27 AM.. |
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11-19-2015, 08:13 PM | #21 |
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You can run 255/35 x 18 up front also without any issues. And yes, the camber shims move you from Street to Street Touring. For the E36M3 which the Z4M front suspension is copied from, BMW offers crash bolts that give about 0.5 degrees camber adjustment and are legal for Street, but I checked and they don't offer them for the Z4M unfortunately.
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11-20-2015, 08:37 AM | #22 | ||
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Last autox of the season coming up for me this weekend!
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