|
|
|
02-12-2014, 08:13 PM | #1 | |
Brigadier General
459
Rep 4,531
Posts |
Kgolf's Official STX Build
Well, the Z4M is officially retiring from track and autocross duty.
Past Videos of my 07 Z4M in RTR last year: However, the 128 is taking duty and charging ahead! I'm going to be starting to build the 128 to become a Nationally competitive SCCA STX car. This isn't going to happen within a year, however I hope this build continues throughout the next couple years as I transform the car from a daily driver to a dedicated STX car and NASA TTD car. Throughout the transition, the car will maintain DD status. Spec on the car: 2012 BMW 128i currently 14k miles N51 Engine Manual Transmission Manual Seats M Sport Package No Sunroof So, let me start with plans/current mods for this year: Currently Purchased: TCK Dual Adjustables APEX 17x8.5 Wheels - Hyper Black Eibach 28mm Sway Bar Hawk HP+ Pads Schroth Quick-Fit Pro Harness Vorshlag Wheel Studs (transferred from Z4M) Still need to purchase: Tires (Currently trying to decide between Hankook or Dunlop, in 245s) This will start me out. For this year as I learn the car. Potential Upgrades: Clutch LSD or similar, Exhaust. Questions/Comments? Lets have some fun I'll update this thread as the build progresses, and I attend events. Rules for STX: Quote:
Last edited by Kgolf31; 03-20-2014 at 01:14 PM.. |
|
02-12-2014, 08:53 PM | #2 |
California-bound
383
Rep 1,480
Posts |
Excellent, a solid build thread for the E82.
I only have a few comments to add. Are your wheels 17x8.5 ET40 all around? If so, that ET40 is going to kill your fitment in the back. You may be stuck with a 235/40/17 in order to not kill your fenders. I'm at -1.6* camber in the rear, and when I tried to test fit my 17x8.5 ET40, with 255/40 RS3, it wasn't even close. In your tire debate, go with Z2's. Not sure if you remember, but I'm originally from the OVR-SCCA as well. Z2's have a broader temp range, and are superior for AutoX. Even out here, I'm getting crushed in the street tire classes with my RS3's. Almost everyone is on Z2's, or Rivals. Do the TCK's come with camber plates? If not, once again you're going to hit fitment issues. Just eying it, you'll need at least -1.5* up front to fit 245's, maybe a tick more.
__________________
Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 |
Appreciate
0
|
02-12-2014, 09:17 PM | #3 | |
Brigadier General
459
Rep 4,531
Posts |
Quote:
Yes, the wheels will be 17x8.5 ET40 all around. Fenders are going to be rolled, and I confirmed fitment with TC and APEX before ordering. Ideally I wanted 17x9, but didn't have the offset to make it work I was planning on getting around -2* in the rear...How bad was your fitment? What car did you drive at OVR? I never remember a 135 driving.... I ran RS3s for 2 years on the Z4M and absolutely loved them, they held temperature like none other, and I put down some serious good results (I placed 4th in Gov Cup this year). However at the end of their life (when I started cording them) the grip dropped off a cliff and in the cold they just sucked. I don't know if you follow tire tech much, but rumors about Hankook and Dunlop both that they are changing their compounds for this year, so it will be interesting how the Hankooks are this year. RS3s isn't a good camber limited tire, it loves camber...that is how the sidewall deflects to get maximum grip. The TCK DAs (i'm looking at them right now) do indeed come with caster/camber plates. I plan on running around -3* camber...so front fitment won't be an issue |
|
Appreciate
0
|
02-13-2014, 10:26 AM | #5 |
Captain
326
Rep 914
Posts |
I'll be keeping an eye on this. I love watching build threads. Also, you stated that the engine is a N51 in the OP.
Why not get the Apex's with offsets to allow you to run 265's in the rear? Do you have to run a square setup? |
Appreciate
0
|
02-13-2014, 10:42 AM | #6 |
Lieutenant
229
Rep 457
Posts |
I'm glad to see a 128i being properly built. I'll be very interested to see how competitive the car is especially in TTD. I've thought about going that route with mine in several years from now.
|
Appreciate
0
|
02-13-2014, 12:22 PM | #7 | ||
Brigadier General
459
Rep 4,531
Posts |
Quote:
Quote:
As well, we carry secondary cats, which means I can run catless headers and still use secondary cats to maintain rules. To address, the offsets APEX offers for 1 series fitments come in 9.5" wide. Class limit is 9" wide wheels, thus my solution. Keeping square also allows for a neutral set-up. 17x8.5" wheels are actually the lightest wheel they make (for comparison the OEM wheel is around 25-26 lbs were as the APEX wheels are 17 lbs). It will be a massive difference on unsprung weight TTD won't come for a couple years, but I'll be tracking it heavily with NASA so I'll get to compare my lap times with a TTD car for example. Last edited by Kgolf31; 02-13-2014 at 12:51 PM.. |
||
Appreciate
0
|
02-13-2014, 01:01 PM | #8 | |
Captain
326
Rep 914
Posts |
Quote:
|
|
Appreciate
0
|
02-13-2014, 01:11 PM | #9 |
Major
175
Rep 1,491
Posts |
Where is the like button when I need one! Maybe we will bump heads, my home state is MD but I will be living in NC. For the next couple of years. I want to do the same thing with My 128i.
__________________
Black Wrapped Roof, BFG Rivals, Dinan Camber plates, M3 Steering wheel, Matte Black kidney Grills, H&R Sport springs,
Sparco assetto gara,Pagid sport Brakepads,STOPTECH Slotted Rotors, DISA STG3,EURO BOX |
Appreciate
0
|
02-13-2014, 01:16 PM | #10 |
Lieutenant Colonel
207
Rep 1,557
Posts
Drives: F10 M5 & F85 X5M
Join Date: Apr 2009
Location: Miami, FL
|
Looking forward to this. GL with the built. We got you covered.
|
Appreciate
0
|
02-13-2014, 03:18 PM | #11 | ||
Brigadier General
459
Rep 4,531
Posts |
Quote:
The N51 is a SULEV...for Cali Quote:
If you decide to do some traveling to Ohio there are a couple national events taking place. Thanks Manny, can't wait to see the possibilities! |
||
Appreciate
0
|
02-13-2014, 03:39 PM | #12 | |
California-bound
383
Rep 1,480
Posts |
Quote:
Here's a direct comparo, both tires are 255's mounted on an 8.5" wheel. RS3 v. Z1 *Spec: http://jakestumphracing.tumblr.com/p...-part-2-finale Sorry, can't do a direct picture link for whatever reason, work computer doesn't allow hyperlinking/picture sharing? Scroll about 3/4 the way down. I only ran the 1'er for half a season (2013) before I ended up moving to SoCal. Prior to that, I ran a black Mazda3 wagon in Street Mod-Street tire. It had a CF hood, and bronze RPF1. You may remember that one, as I ran that car from late 2009-2012.
__________________
Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 Last edited by Ginger_Extract; 02-13-2014 at 03:44 PM.. |
|
Appreciate
0
|
02-13-2014, 05:10 PM | #13 | |
Brigadier General
459
Rep 4,531
Posts |
Added videos of my Z4M last year.
Quote:
Both the Kooks and Dunlops run wide, it is a nature of their tire. 245s should be optimal for the 8.5" |
|
Appreciate
0
|
02-13-2014, 07:32 PM | #14 | |
California-bound
383
Rep 1,480
Posts |
Quote:
Do you have any experience in the National level? Ever do any Pro-Solo events prior to this?
__________________
Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 |
|
Appreciate
0
|
02-13-2014, 08:19 PM | #15 | |
Brigadier General
459
Rep 4,531
Posts |
Quote:
Unfortunately, last year I missed registration for the pro-solo at Toledo and couldn't take vacation for the Tour at Wilmington. Last year was probably the first year that I thought the car was prep;ed and I was ready to compete in that type of field. This year I'm planning on Toledo Pro, Wilmington Pro and Tour, and Championship Tour. |
|
Appreciate
0
|
02-13-2014, 10:13 PM | #16 |
California-bound
383
Rep 1,480
Posts |
Now that I think about it, tucked away, deep in the Channels of 1A, there are two or three threads back in 2008 when these cars came State-side, of people prepping them for National-level Solo use. IIRC, they were mostly stock class 135's, but that may be something worth digging up.
__________________
Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 |
Appreciate
0
|
02-14-2014, 07:12 AM | #17 | |
Brigadier General
459
Rep 4,531
Posts |
Quote:
The problem with Stock class is that it is a pretty much doesn't correlate to STX, or any street tire class at all. They have to maintain stock springs, but can change dampers, OEM wheel widths, only 1 sway bar, no camber changes...and big RComps. |
|
Appreciate
0
|
02-14-2014, 08:53 AM | #18 | |
Private
13
Rep 83
Posts |
Quote:
I'm looking forward to see how your build comes along and hearing about what works and what doesn't for you. |
|
Appreciate
0
|
02-14-2014, 10:24 PM | #19 | |
!
692
Rep 3,266
Posts |
Quote:
__________________
____________________________ |
|
Appreciate
0
|
02-15-2014, 12:55 AM | #20 | |
First Lieutenant
22
Rep 380
Posts
Drives: 2012 135i
Join Date: Jun 2012
Location: Sacramento
|
Quote:
|
|
Appreciate
0
|
02-16-2014, 07:40 PM | #21 | ||
Brigadier General
459
Rep 4,531
Posts |
Quote:
I like a firm ride, I got a young body...so I'll be good with it. Quote:
I'm still very borderline on both tires, both have different approaches at getting grip. The Z2s offer a stiffer sidewall, where the RS3s like a ton of slip angle. I had no problem getting RS3s up to temp within a run. One big plus on the Hankooks is that they offer contingency. BTW - Registered for the Wilmington Match Tour for April 12-13th. Will only have 1 local event to tune in the car, and that is the weekend prior. This will be interesting |
||
Appreciate
0
|
02-17-2014, 05:57 PM | #22 |
Brigadier General
459
Rep 4,531
Posts |
First of multiple purchases starting to finally roll in this week:
APEX wheels should be in at the end of this week. Called tirerack, and found out Hankook RS3s will not be in stock until May. They are going to lose alot of sales, and looks like ZIIs are my only route to go from here. |
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|