04-12-2014, 03:23 PM | #1 |
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X1 35i M-Sport Track/Daily Driver Build
EDIT: I'm going to turn this thread into a mini build log tracking the modifications I have done and will be doing.
As I've said from the very beginning, I believe the X1 to be an almost ideal only car for someone like me. I have only one garage and live in a city, but am an avid car enthusiast who enjoys both the drag strip and road course. I play tennis and baseball at least four times a week, and constantly find myself making Home Depot or Ikea runs (translation: I need a hatchback with folding seats). On top of this, we have nasty winters where I live and AWD is a necessity. Therefore, my goal is to take the X1 and elevate it from a "great" all around car into the "perfect" all around car for me. My goals: 1. Retain stock-like comfort and drive-ability. I need to be able to have a date in the passenger seat, hit a pothole, and not lose any chance I have 2. Run a 1/4 mile in under 12.0 seconds. 3. Lap Mid-Ohio Sports car course in under 1:45 (equivalent or faster than a e92 M3 with good tires and camber plates driven by a good driver) 4. Improve the X1's somewhat awkward cosmetics The easiest of these will be the cosmetics. To that end, I have fitted the BMW Performance black grills and Renn Motorsport 19inch wheels. Running a 1/4 mile in under 12 seconds is not easy, but doable. The car currently stands at 12.1. I believe upgrading from the Wagner intercooler to the newly ordered Evolution Raceworks Competition intercooler (in anodized black) along with dropping nearly 40lbs of rotating weight with the lighter wheels may do the trick. I will be testing this within the next couple of weeks. Lapping Mid-Ohio competitively with the M3 is obviously the most difficult. I am a relatively noob driver, and have only been to Mid-Ohio once. With a bone-stock suspension and stock runflat tires, the X1 was running consistently in the low 1:5x range. The question becomes, besides becoming a better driver (which will surely cut multiple seconds from that time the more I go), what can I do to achieve that goal? I decided on a comprehensive suspension overhaul based around the JRZ RS1 coilover. For those unfamiliar with JRZ, as I was before I began doing research about a year ago, they are a high-level racing outfit that manufacturers some of the winningest suspension setups of the last few years. They are on the level of Moton and AST. My exact setup is going to be: JRZ RS1 Coilover Ground Control Hybrid Camber Plates Swift Springs As I literally just ordered the suspension today, I will be tweaking the spring rates with the help of my local performance shop (and e90post sponsor) Turn In Concepts. I cannot recommend these guys highly enough - they have extensive race experience and have all of the equipment in-house that gives me the confidence to trust them with my setup, including a shock dyno. I will also be installing several M3 suspension components, such as the rear lower guide arms, subframe bushings, and potentially the sway bar if it fits. I also ordered a dedicated set of track wheels - Apex ARC8 17" 9.5in, et35. These weigh only 16.9lbs each - 10lbs lighter than the stock wheels per corner. I will be running Dunlop Direzza Zii tires in a 255 square setup. On the street, I will run OEM brake pads. On the track, I have PFC08 - since the X1 has the 335i rotors and calipers, this works perfectly. I will likely go with a Stoptech ST60 kit once I become a better driver - the Apex wheels clear this kit fine even though they are only 17in. Unfortunately, there is a wait time for the JRZs as they are hand built in the Netherlands. I won't have them installed for around 1-1.5 months. This will give me time to hit the track a few more times on stock suspension, which should enable me to better understand the upgrade. My next track day at Mid Ohio is from May 9-11th - one week away! This will give me a good baseline time with the stock suspension, but with the ER intercooler and Apex wheels. My focus for now is to become a better driver rather than laptimes (I will not be driving 10/10ths at a HPDE), but nonetheless I will be quite happy if I can break 1:50. Expect lots of pics and video of the X1 at Mid Ohio with the new intercooler and wheels soon. In the meantime, here's how it looks in the daily driver setup. JB4 Tune, Map 7 with flexfuel wires BMS Catless Downpipe BMS Intake Evolution Racewerks chargepipe NGK plugs gapped to .022 Alpina B3 Transmission Flash Wagner Intercooler Rennsport 19 inch wheels, 9.5" ET35 (10mm front spacer, 5mm rear) 265/35/19 Michelin PSS square setup BMW Performance aluminum pedal set Laser Interceptor police LIDAR jammers Valentine 1 hardwired detector Coilovers are up next. Click thumbnails for larger size. Last edited by paradoxical3; 05-01-2014 at 10:33 PM.. |
04-12-2014, 04:23 PM | #3 |
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04-13-2014, 12:35 PM | #6 |
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Very nice man, I am curious do you have any rubbing inside the fenders?
And a second question, since you did so much homework, what is the max rim width you can go with by keeping the original setting without using any spacers? |
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04-13-2014, 01:18 PM | #8 | ||
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At first I thought I didn't have any rubbing, but with these tires there is slight rubbing ONLY at full lock in the middle of the fender liners. After a day or so they don't rub anymore. I did remove one bolt from the oil cooler grill because I was paranoid it might touch when the front end was under load. You can go basically as wide as you want with appropriate offsets if your car is not lowered, because the fenders are above the wheels. For the back you could probably easily fit 295 or even 305 rubber there if your car is stock height, less if it's lowered. For the front, the only issue you will have is rubbing at full lock in the middle of the fender liners. The thing is, the rubbing is caused because my tire diameter is slightly bigger than stock. 265/35/19 is a taller tire than the stock 225/40/19. If I could do it over, I think I would do 9.5 square setup ET20 with 275/30/19. This would be 2.3% smaller than stock diameter, which would almost definitely not rub. Last edited by paradoxical3; 04-13-2014 at 01:25 PM.. |
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04-13-2014, 04:16 PM | #9 |
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Drives: X1 xdrive 23d
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Beast...
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04-13-2014, 11:27 PM | #10 | |
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Basically, I am trying to find out what will be the most wider tire I can install in a square setup without getting any rubbing, even at full lock. PS What is the impact of your new setup on the gas mileage ? Last edited by Teutonic; 04-13-2014 at 11:35 PM.. |
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05-04-2014, 03:50 PM | #16 |
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bmw x1 35i n55 downpipe need help which one
hi para i cant remember which down pipe you recommend since now bms doesn't sell there downpipe for the bmw n55 any more? what i did find out so far -
for the bmw x1 35i downpipe - vr- the cheapest $290 i like its a 3"1/2 main tube not to large wont create excess turbulence inside but the inside diameter of the exiting two pipes measure 2"1/4 and if iam correct our exhaust pipes are 2"1/2 inner diameter, if our inner diamiater is 2"1/4 this is a good one. active auto-$599 4" main tube looks like its built very well but they dont show the inside transition from main tube to the exiting two pipes, i say this because the ar down pipe looks so smooth on the inside. good hardwear. ar design-$656 4" main body looks like its built well, very smooth in side and they have pictures when others dont, what is cool they have a heat coating to keep engine temps down which is critical. others i didnt include if it was to cheaply made or no good pictures or not smooth inside or pinches. |
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05-04-2014, 04:24 PM | #17 |
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why are you switching out the wagner intercooler? did it not perform well when u took it around a track?
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2014 bmw x1 xdrive35i M sport alpina white
Mods: Bms intake, jb4 stage 2, er charge pipe, Wagner intercooler, black m sport grills, cyba air scoops, alpina tcu flash. |
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05-11-2014, 09:12 PM | #18 | |
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I took the car to Mid-Ohio this weekend and I hit 1:48, which I am very happy with. It is understeering pretty bad and a better driver could probably grab another second or two out of it, but considering it's a SUV on stock suspension and street tires it's pretty crazy. |
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05-18-2014, 09:35 PM | #20 |
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Hey para i looked at the pictures of the intercooler, a little ruff i can buy new $650. the model you have it doesnt cool as much as i would like and thats why your selling it, but i could use it until i find something better. I think $400 is a good price in its condition. i have to hope it doesn't have a leak or hole and its not bent. let me know.
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05-19-2014, 12:11 AM | #21 |
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OP, have you thought about convert it to RWD? Apparently someone had done it by removing the front drive shaft, and use JB4 to defeat DTC.
http://www.e90post.com/forums/showpo...&postcount=519 Do you have any videos of you driving from the inside of the car? Would like to hear how the tranny flash do for you on the track. |
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05-19-2014, 10:11 PM | #22 | |
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I do not have videos from inside the car, next time I go to the track I would like to get a better camera mount that will show my hands. The wait for the JRZs is almost over, they should be shipping next week! The next weak link in the car is definitely the brakes. I cannot decide what to do - spring for a Stoptech BBK or try to go with upgraded rotors and a more aggressive pad. Very hard decision. |
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