SCTS Racing M4 Race Car Build

[scottn2retro]

Yea, some new toys arrived. I'll explain in a few days, but it has to do with how long the M4 is and how our lift/lift ramps in our trailer are configured. We've been having issues with the car bottoming out on the front of the lift.

[scottn2retro]

I've started another thread in this Track forum about the Race Ramps. But here's what we've ended up doing to help get that long, low M4 onto the lift.

http://f80.bimmerpost.com/forums/sho....php?t=1367802

[scottn2retro]

Now that the car is mostly built, time to add some more wheels so we have more tire sets at the track

[scottn2retro]

Nest task - gotta move that race radio off the tranny tunnel and up to the dash where the driver can see/adjust it.

First, with cardboard first as a template, cut the shape of the dash panel.


Then mount the radio securely


Again, using the cardboard first, cut the hole for the radio in the dash panel
and paint it black

[scottn2retro]

Got the MCS shocks back from rebuild in time to put them on for corner balancing before Buttonwillow. Turns out they were valved really good for a street car, but we got them re-valved now for racing.


I'll have to admit, I'm no expert on shock dyno reports, but I believe what they are saying is that they are now going to be controlling to a tighter band

[scottn2retro]

Here's a video at Buttonwillow of loading the M4 into the trailer and onto the lift using the Race Ramps

https://www.facebook.com/sctsracetea...2415930614388/

[scottn2retro]

The shock rebuild was a HUGE improvement as we continue to dial in the car. Here are some on track pics from Buttonwillow.

[YMB_M3]

What lap times were you guys putting down at Buttonwillow 13CW Config?

[scottn2retro]

Originally Posted by YMB_M3

What lap times were you guys putting down at Buttonwillow 13CW Config?

I think Ralph was in the lower 1:50's with thin R-comp tires. We'll ramp up the tire grip in coming events.

[scottn2retro]

Another visit to my home away from home, the Certified Tire shop in Huntington Beach, where Roger does all our race team tires

[scottn2retro]

Dropped off the M4 for display at the Certified Tire shop in Huntington Beach

[Race82]

Originally Posted by scottn2retro

Dropped off the M4 for display at the Certified Tire shop in Huntington Beach

Looks great, super job with this car!! Best thread

What seats and harness did you go with - how did you solve the airbag software issue?

[scottn2retro]

Originally Posted by awbmw

Looks great, super job with this car!! Best thread

What seats and harness did you go with - how did you solve the airbag software issue?

We have a Sparco seat. What airbag software issue specifically? We found that we need to keep the electronic module that sits on the tranny tunnel.

[Race82]

Originally Posted by scottn2retro

We have a Sparco seat. What airbag software issue specifically? We found that we need to keep the electronic module that sits on the tranny tunnel.

I was told that an airbag warning triggers if there is no longer an air bag when the stock seat is replaced with a racing seat... are you still running stock ECU or did you switch to a Motec or similar as this would negate the issue.

[scottn2retro]

Originally Posted by awbmw

I was told that an airbag warning triggers if there is no longer an air bag when the stock seat is replaced with a racing seat... are you still running stock ECU or did you switch to a Motec or similar as this would negate the issue.

We have all kinds of warnings that come up on the display, but we did take the cluster apart and tape over some of the nagging red light warnings.

[scottn2retro]

Did some splitter work in getting ready for the Bimmerfest races. For anybody coming to the event, we'll be in garages 99-100.

[scottn2retro]

From the grid of Bimmerfest races at Auto Club Speedway

[TZANIDO777]

If you do not mind me asking, what do you guys do about rainy days and a foggy windshield? Not sure how much it rains or if ever where you are located but I noticed your heater core is removed so what if any, solution do you have for defogging your windshield when/if needed?

[scottn2retro]

Originally Posted by TZANIDO777

If you do not mind me asking, what do you guys do about rainy days and a foggy windshield? Not sure how much it rains or if ever where you are located but I noticed your heater core is removed so what if any, solution do you have for defogging your windshield when/if needed?

For sprint races, RainX and FogX are usually enough to get you through a race, but for endurance races, you need to have more of a solution. That can be a number of things from leaving the heater box in, having a manual inside wiping system in place (I have seen all manner of those), having a blower, having a rear window style electric heater, buying an actual heated windshield from Europe, etc.

[scottn2retro]

On track pic from Bimmerfest races

[scottn2retro]

Since we took out the video/nav display system, we haven't had a way to check the oil level. Ordered this kit from Rheingold. I had heard we would be able to get the oil level from it, so we'll see.

[scottn2retro]

Did a track day at Cal (Auto Club) Speedway and definitely impressed with the M4. It was 107 deg. out there and the car didn't go into limp mode once. This is the first BMW we've raced where we haven't had to modify the water and/or oil cooling.

the full album
https://scontent-lax3-1.xx.fbcdn.net...f2&oe=59F6D2E3