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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Mon, Mar-26-2018, 10:55:36 PM   #1
ThunderMoose
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Default Broke Front Splitter at VIR

This weekend, I managed to break my AJ Hartman front splitter at VIR. But it was done on track...not from an off track excursion or high curb.

It happened at the end of the back straight at the braking zone just before the roller coaster.

The car was at about 140 and when I came off gas, it started to rub a bit and when I started braking, it bit so hard into the asphalt that it felt like I had broke a rotor. The dam split from the bottom of the splitter.

This past winter I lowered the car a 1/4" and went to 700# springs. The splitter probably sat 3.25 inches from the ground.

Last year at VIR, I had 800# front springs and splitter was at 3.5". I had no issues.

I raised the car up back to its original height but splitter kept biting at the same spot.

Has anyone had a similar experience with their splitter? What did you do?

I have full aero. Car weighs 3000# with me and 3/4 tank. Maybe I need to go to 900/1000?

Thanks in advance.

Denis


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#67 2019 NASA National TT3 Champion; 2017 NASA TX TT3 Champion

FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS 2W NR, Hyperco 700F 800R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148

Last edited by ThunderMoose; Mon, Mar-26-2018 at 11:34:46 PM.
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Old Mon, Mar-26-2018, 11:18:11 PM   #2
PenguinScotty
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Default Re: Broke Front Splitter at VIR

The only little bit i can contribute in this regard would be my conversations with Nitron and Bimmerworld regarding my setup. It's a full weight car that's being slowly transformed into track-only, and both Nitron and Bimmerworld recommended 800lbs front springs and 400lbs rear (True coilover). No aero on mine yet, until i get more experience.

James from Bimmerworld actually said 8-900lbs, with no aero, for pretty much a full weight car like mine.

Sorry i cannot provide better info. Hopefully this is somewhat useful, though.
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Old Tue, Mar-27-2018, 01:58:48 AM   #3
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Default Re: Broke Front Splitter at VIR

Can you install a sheet of aluminum on the underside of the splitter to protect it?
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Old Tue, Mar-27-2018, 02:25:05 AM   #4
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Default Re: Broke Front Splitter at VIR

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Originally Posted by SQ13 View Post
Can you install a sheet of aluminum on the underside of the splitter to protect it?
The bottom is in tact. It appears that bottom of leading edge is contacting the pavement...hard.
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#67 2019 NASA National TT3 Champion; 2017 NASA TX TT3 Champion

FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS 2W NR, Hyperco 700F 800R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148
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Old Tue, Mar-27-2018, 02:53:26 AM   #5
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Default Re: Broke Front Splitter at VIR

Maybe just need a go-pro** vid to see if it's deflecting?

Last edited by Drewster; Tue, Mar-27-2018 at 03:11:00 PM.
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Old Tue, Mar-27-2018, 03:00:48 PM   #6
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Default Re: Broke Front Splitter at VIR

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Originally Posted by Drewster View Post
Maybe just need a go-to vid to see if it's deflecting?


Good idea. I think it has to be deflection. I can't see weight transfer alone being sufficient to drop car 3.5" under deceleration.


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#67 2019 NASA National TT3 Champion; 2017 NASA TX TT3 Champion

FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS 2W NR, Hyperco 700F 800R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148
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Old Tue, Mar-27-2018, 07:00:22 PM   #7
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Default Re: Broke Front Splitter at VIR

My initial thought is that yes, at 140 mph the downforce on the front end may be enough to bring the splitter into contact under braking. It could be deflection. It would probably be most beneficial to know this before changing anything else.

Another idea, what are your compression and rebound settings? Could it be the front dampers are jacking down at the end of a long straight?
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Old Tue, Mar-27-2018, 08:27:52 PM   #8
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Default Re: Broke Front Splitter at VIR

Quote:
Originally Posted by 10speed View Post
My initial thought is that yes, at 140 mph the downforce on the front end may be enough to bring the splitter into contact under braking. It could be deflection. It would probably be most beneficial to know this before changing anything else.



Another idea, what are your compression and rebound settings? Could it be the front dampers are jacking down at the end of a long straight?


I had 8C/12R. I will definitely go stiffer. I like drewsters suggestion of putting on a go pro to see what i actually looks like.


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#67 2019 NASA National TT3 Champion; 2017 NASA TX TT3 Champion

FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS 2W NR, Hyperco 700F 800R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148
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Old Tue, Mar-27-2018, 09:36:10 PM   #9
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Default Re: Broke Front Splitter at VIR

Sounds like you can rule the damper rebound setting out, although, added compression may help hold the front end up under braking.
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Old Wed, Mar-28-2018, 01:14:21 PM   #10
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Default Re: Broke Front Splitter at VIR

Even with controlling the deflection, you need to stiffen up the spring rates front and rear with your aero. 700-800 is not enough.
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Discussing E46 M3 GTS-3 Build and Progress Thread in the M3 Track: Racing and DE Forum - Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)