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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Tracking, Autocrossing, Dragstrip, Driving Techniques > STX class anyone?



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      07-11-2015, 02:46 PM   #1
TheAxiom
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STX class anyone?

Anyone building to the STX class?
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      07-12-2015, 05:17 PM   #2
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In my full honest opinion, the E90/2 chassis doesn't stand a chance nationally. Locally might be fun but it'll be a frustrating build getting the car to do what you want.

(PS - If you're thinking about competing that 3 Stage Manifold is illegal)
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      07-12-2015, 07:50 PM   #3
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Quote:
Originally Posted by Kgolf31 View Post
In my full honest opinion, the E90/2 chassis doesn't stand a chance nationally. Locally might be fun but it'll be a frustrating build getting the car to do what you want.

(PS - If you're thinking about competing that 3 Stage Manifold is illegal)
Make em stop me! Is the weight of the E90 going to be issue?
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      07-12-2015, 08:52 PM   #4
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Quote:
Originally Posted by TheAxiom
Quote:
Originally Posted by Kgolf31 View Post
In my full honest opinion, the E90/2 chassis doesn't stand a chance nationally. Locally might be fun but it'll be a frustrating build getting the car to do what you want.

(PS - If you're thinking about competing that 3 Stage Manifold is illegal)
Make em stop me! Is the weight of the E90 going to be issue?
Weight and wheelbase/width most likely.
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      07-12-2015, 10:25 PM   #5
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Longer wheel base and more width make the car more stable.
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      07-12-2015, 10:30 PM   #6
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Quote:
Originally Posted by TheAxiom View Post
Longer wheel base and more width make the car more stable.
Let me know how that does through slalom, transitions, and basically every other aspect of an autocross course.

You're competitor is a FRS, look at what that is compared to you.

Think about it this way, if your car is an inch wider, that's a disadvantage to you against another car that is narrower than you and can fit through an element with less effort and steering input than you.
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      07-12-2015, 11:27 PM   #7
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Quote:
Originally Posted by Kgolf31 View Post
Let me know how that does through slalom, transitions, and basically every other aspect of an autocross course.

You're competitor is a FRS, look at what that is compared to you.

Think about it this way, if your car is an inch wider, that's a disadvantage to you against another car that is narrower than you and can fit through an element with less effort and steering input than you.
Who the hell do you think you are? You think you can just come in here, be realistic about shit, and tell me the truth and get away with it? You talk like you actually know what you're talking about using facts and shit.


Seriously though, It does make me want to try harder and give it a shot.

I know, I weigh more, I'm wider, I'm longer and don't want to rotate as much - but I'm hoping the stable nature make me comfortable enough to drive harder. We'll see, right?
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      07-12-2015, 11:29 PM   #8
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Quote:
Originally Posted by Kgolf31
Quote:
Originally Posted by TheAxiom View Post
Longer wheel base and more width make the car more stable.
Let me know how that does through slalom, transitions, and basically every other aspect of an autocross course.

You're competitor is a FRS, look at what that is compared to you.

Think about it this way, if your car is an inch wider, that's a disadvantage to you against another car that is narrower than you and can fit through an element with less effort and steering input than you.
So am M3 is at a disadvantage on the track compared to a 335 then?
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      07-13-2015, 09:59 AM   #9
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Quote:
Originally Posted by TheAxiom View Post
Who the hell do you think you are? You think you can just come in here, be realistic about shit, and tell me the truth and get away with it? You talk like you actually know what you're talking about using facts and shit.


Seriously though, It does make me want to try harder and give it a shot.

I know, I weigh more, I'm wider, I'm longer and don't want to rotate as much - but I'm hoping the stable nature make me comfortable enough to drive harder. We'll see, right?
lol.

Go for it, but just as an FYI you'll have to get rid of that 3-Stage DISA and keep your secondaries (or swap to a lower cell hi-flow car and maintain location within 6")

You'll struggle in sweepers but you'll probably have an advantage in high speed transitions and perhaps slaloms.

Quote:
Originally Posted by LaxIan55 View Post
So am M3 is at a disadvantage on the track compared to a 335 then?
I never said anything about track.

Also, I'm talking about a specific class within Solo, STX. I'd say I'm pretty familiar with it as I compete Nationally within it.



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      07-13-2015, 12:30 PM   #10
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Quote:
Originally Posted by Kgolf31 View Post
lol.

Go for it, but just as an FYI you'll have to get rid of that 3-Stage DISA and keep your secondaries (or swap to a lower cell hi-flow car and maintain location within 6")

You'll struggle in sweepers but you'll probably have an advantage in high speed transitions and perhaps slaloms.



I never said anything about track.

Also, I'm talking about a specific class within Solo, STX. I'd say I'm pretty familiar with it as I compete Nationally within it.



Are you required to run that Tirerack banner?

Anyhow, can't it be argued that the 3 stage is pretty much standard equipment on the cars - the N51 has it, so does the 330i. I think I might have an issue with my Dinan Intake as well.

BTW, I've watched your videos - how do you get that overlay and telemetry information? (speed and throttle position)
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      07-13-2015, 12:58 PM   #11
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Quote:
Originally Posted by TheAxiom View Post
Are you required to run that Tirerack banner?

Anyhow, can't it be argued that the 3 stage is pretty much standard equipment on the cars - the N51 has it, so does the 330i. I think I might have an issue with my Dinan Intake as well.

BTW, I've watched your videos - how do you get that overlay and telemetry information? (speed and throttle position)
Tirerack sponsors the SCCA, so it's required to run them at National Events. Same thing goes for the ProSolo and National Event stickers on the side and the SCCA sticker up front.

Doesn't matter, rules state as such. You'll be okay with the intake as long as it follows below:

Quote:
The air intake system up to, but not including, the engine inlet may be modified or replaced. The engine inlet is the throttle body, carburetor, compressor inlet, or intake manifold, whichever comes first. The existing structure of the car may not be modified for the passage of ducting from the air cleaner to the engine inlet. Holes may be drilled for mounting. Emissions or engine management components in the air intake system, such as a PCV valve or mass airflow sensor, may not be removed, modified, or replaced, and must retain their original function along the flow path.
The data is built off of SoloStorm:

http://www.petreldata.com/product/so...-android-v2-2/

It's an android app. I run it off of a Nexus 7 and external 10 hz GPS and a bluetooth OBDII
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      07-14-2015, 04:38 PM   #12
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Quote:
Originally Posted by Kgolf31 View Post

The data is built off of SoloStorm:

http://www.petreldata.com/product/so...-android-v2-2/

It's an android app. I run it off of a Nexus 7 and external 10 hz GPS and a bluetooth OBDII
Good stuff kgolf31. Like an AIM Solo, but on a tablet. I take it the footage is via wireless GoPro. Or do you render it later using one of the race rendering programs?
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      07-14-2015, 09:40 PM   #13
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Quote:
Originally Posted by neoduffer
Quote:
Originally Posted by Kgolf31 View Post

The data is built off of SoloStorm:

http://www.petreldata.com/product/so...-android-v2-2/

It's an android app. I run it off of a Nexus 7 and external 10 hz GPS and a bluetooth OBDII
Good stuff kgolf31. Like an AIM Solo, but on a tablet. I take it the footage is via wireless GoPro. Or do you render it later using one of the race rendering programs?
I run a Hero2 so no wifi for me, and I just integrate it later on within the program. The wifi models integrate and merge the data realtime.

The best part is after each run you can review data to see where you went faster or slower and improve those areas that need work
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      07-16-2015, 07:53 PM   #14
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This thread is too funny. Makes me realize how I perceived the sport years ago vs now. To be fair concerning the illegal mode, it is important to note autocross is about classing your car correctly in class. Competitors can call you out on it but its really passive aggressive to know you have an illegal mod and then challenge competitors to call you on it. The E90 non 335 has a tough road to hoe in STX and the 335i is buried in STU in my opinion. They both have a hell of a time in FS against the M3 and Mustangs.
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      07-17-2015, 07:51 AM   #15
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This thread is too funny. Makes me realize how I perceived the sport years ago vs now. To be fair concerning the illegal mode, it is important to note autocross is about classing your car correctly in class. Competitors can call you out on it but its really passive aggressive to know you have an illegal mod and then challenge competitors to call you on it. The E90 non 335 has a tough road to hoe in STX and the 335i is buried in STU in my opinion. They both have a hell of a time in FS against the M3 and Mustangs.
I'd rather make it apparent then allow someone to sink a bunch of money into their car to figure out someone wants to ruin their day.

That's all
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      07-17-2015, 12:14 PM   #16
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Guys, I ran with a local group that was just for fun so mods weren't super important, this would be no different. I don't have the budget to ppay with the big boys, even if I did have the talent.

Z3papa spent years running a Z3, and I have to tell you, I feel the E90 chassis is lightyears better than the Z3 was... (different classes I know) but I imagine it was fun just the same, no?

Here it to being an underdog!

Last edited by TheAxiom; 07-17-2015 at 01:32 PM.
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      07-17-2015, 12:28 PM   #17
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Originally Posted by Kgolf31 View Post
I'd rather make it apparent then allow someone to sink a bunch of money into their car to figure out someone wants to ruin their day.

That's all
Oh I hear you. I spent years being ultra competitive locally and even some regional events only to be frustrated to no end at Nat'l level. Last year, after doing the Toledo/Wilmington Pros but before Nats, I came to the conclusion I was tired of banging my head against the wall and decided to sell the car I loved for a car I could win in and love. Enter the E92 M3.
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      07-20-2015, 10:25 PM   #18
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Just FYI I don't think an E90/2 can do this.

YMMV

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      07-21-2015, 01:38 AM   #19
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I think it can.
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      07-21-2015, 12:21 PM   #20
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I don't think 200lbs and a slightly wider wheel base are going to put me behind you. I know there is a way, I just haven't found it yet.
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      07-21-2015, 02:34 PM   #21
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Quote:
Originally Posted by TheAxiom View Post
I don't think 200lbs and a slightly wider wheel base are going to put me behind you. I know there is a way, I just haven't found it yet.
The weight has a bigger impact than what you think. Also on something like a high speed 75' slalom (in the video). Your car is at a disadvantage.

I have trouble with keeping up to the FRS in sweepers and I'm at least 200 pounds heavier. Now imagine 400 pounds heavier.

I mean more power to you if you can find the time. But it won't be easy
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      07-21-2015, 03:06 PM   #22
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Quote:
Originally Posted by Kgolf31 View Post
The weight has a bigger impact than what you think. Also on something like a high speed 75' slalom (in the video). Your car is at a disadvantage.

I have trouble with keeping up to the FRS in sweepers and I'm at least 200 pounds heavier. Now imagine 400 pounds heavier
Road hugging weight dude.
And hopefully I can overcome with better suspension geometry and torque. (seriously)

Break down:

E36 -
Wheel base: 270cm
Width: 169.9cm
Length: 443.2cm
Curb weight: 3000lbs?

E82 -
Wheel base: 266cm
Width: 174.8cm
Length: 436cm
Curb weight: 3100lbs?

E90-
Wheel base: 276cm
Width: 181.6cm
Length: 452cm
Curb weight: 3300lbs
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