TRACK ONLY BUILDS! What can be removed vs. what is required (modules, coding, etc..)

[chriskeefe]

I noticed there aren't very many open discussions on the F8X platform for track only builds, minimum requirements for starting, coding etc... This is a way for me to document what I stumble across, learn and / or bash my head against to help the next person.

Bare minimum required to start / limp the car around (stripped interior):
-Instrument Cluster
-Clock Spring (My wipers defaulted to the on position with the clock spring unplugged.
-RFID Key fob sensor (there is a second one in the front of the center console)
-Start Button
-DCT Shifter Mechanism

*** Thanks to BMMMW14 *** "One note is that the fuel gauge runs thru the head unit, so that will not work..." "Keeping the remote key detectors is critical (one mounted to the front cup holder had me stumped for a while). I would code out everything possible (Alex at Alpine did a great job... just tell him you are doing a full gut) before gutting everything else the errors are harder/impossible to get rid of and set your M modes the way you want."

*** A/C DELETE F80 M3 & M4***
You need to evacuate your A/C system prior to disconnecting any lines. The factory tensioner works as intended and the alternator spins the correct direction still with the A/C deleted.

Parts Needed:
Qty: 2 Barbed Plugs measuring 3/4" OD (Line ID measures 3/4") for blocking the coolant lines going to and from heater core. (Re-use OEM clamps)
Qty: 1 Gates Micro V K080365 serpentine belt or equivalent length other brands

Simple as:
-removing the water pump belt
-removing the A/C & alternator belt
-removing the A/C compressor & lines
-replace with the shorter length belt.

Current weight: 3,42X lbs

[NYG]

Approve of this thread. Subscribeeeee.

[swagon]

Jesus, that wang.

Any wind tunnel testing?

[bimmerboyE92]

sub'd

[FriedPiston]

Check out Rowdy's M4 race build:

[DRLane]

Love this! Congrats on the build

If you want further inspiration or run into questions, this build from Missle Works in CO is pretty rad. I see it at the track quite a bit.

[BulkBen]

I'd love to know how much weight you have pulled out of this, certainly haven't held back.

[chriskeefe]

Originally Posted by swagon

Jesus, that wang.

Any wind tunnel testing?

No wind tunnel testing on our specific application but there is ample CFD out there on the Nine Lives Racing airfoils. This is the "Duece" dual-element with chassis mounted swan neck for reference.

[chriskeefe]

Originally Posted by FriedPiston

Check out Rowdy's M4 race build:

I follow him and the M2CompTrackBeast i believe it is with the hemi-swap.

[chriskeefe]

Originally Posted by BulkBen

I'd love to know how much weight you have pulled out of this, certainly haven't held back.

I believe full weight was 3651 (i don't recall fuel level) and its down to 3429 in its current state. Hoping to drop another 150lbs and add back 50 or so with the trunk and interior.

[BMMMW14]

Originally Posted by chriskeefe

I believe full weight was 3651 (i don't recall fuel level) and its down to 3429 in its current state. Hoping to drop another 150lbs and add back 50 or so with the trunk and interior.

I think that is a realistic target. I got mine from 3,605 stock to 3,270 pre-cage, and added back ~170 with the cage, all with a half tank. That was removing everything not required to run... save fore some more wiring harness thinning and cutting sheet metal (doors aren't gutted) that seems about it until you get into carbon and Lexan replacement parts.

[chriskeefe]

Originally Posted by BMMMW14

I think that is a realistic target. I got mine from 3,605 stock to 3,270 pre-cage, and added back ~170 with the cage, all with a half tank. That was removing everything not required to run... save fore some more wiring harness thinning and cutting sheet metal (doors aren't gutted) that seems about it until you get into carbon and Lexan replacement parts.

Awesome to hear. Did you remove the radio, I-drive, A/C etc.. as well?

Any special coding that needed to be done?

Also build thread anywhere or a page to see pictures for inspiration????

[BMMMW14]

Yeah, AC, I-drive and radio are all gone. One note is that the fuel gauge runs thru the head unit, so that will not work... but given I get 3t minutes to a tank it's pointless anyways! Keeping the remote key detectors is critical (one mounted to the front cup holder had me stumped for a while). I would code out everything possible (Alex at Alpine did a great job... just tell him you are doing a full gut) before gutting everything else the errors are harder/impossible to get rid of and set your M modes the way you want. I am pleasantly surprised how few things "went wrong." Unfortunately I didn't do a great job documenting, but here are a couple pics.

[chriskeefe]

Added comments to the main post from BMMMW14

[Mintsopoulos]

The wing makes me smile. Following for sure.

[chriskeefe]

Added A/C Delete information... Should be able to confirm belt length this week.

[chriskeefe]

Added in an X-brace between the rear wing uprights to minimize lateral movement. Bolt-in so it can be removed in case I choose to run a fuel cell in the future.

[HA55L3R]

Originally Posted by chriskeefe

Added A/C Delete information... Should be able to confirm belt length this week.

Any update on that belt length? I'm taking my A/C out next week

[chriskeefe]

Originally Posted by HA55L3R

Any update on that belt length? I'm taking my A/C out next week

Qty: 1 Gates Micro V K080365

updated the original post as well.

[HA55L3R]

Hey did you have to use a resistor in the passenger air bags to code it out and would you happen to know the resistance?

[Dranthonyrega]

Door panels. Do you just pull the cord to open the door?

[ninekrpm]

Fantastic build! I see that you solved for the AC motor…by getting a shorter belt. Were you able to confirm this?