removing undertray from carbon fiber hood

robc1976 · 11-03-2014, 03:54 PM

I have a JL-Motoring carbon fiber hood and a small part of the under tray hits my strut bar. The undertray doesn't appear to do anything, it is very loose and not connected to actual hood except on sides. sometimes rattles against underside of hood.

would it hurt anything to remove a portion of it?

robc1976 · 11-03-2014, 04:01 PM

Here is the portion I want to remove

robc1976 · 11-04-2014, 12:57 AM

I actually circled wrong part, it is the pillar to the left

_ink · 11-04-2014, 04:24 AM

Rob, I'd just put some of that black padding tape there, which will give a cushioned contact and eliminate vibrations.

comablaqq · 11-04-2014, 07:19 AM

It's probably structural, but I'd be more concerned about getting rid of that awful chrome on the intake filters..

shadow191 · 11-04-2014, 08:07 AM

It won't really hurt anything. The hood will be a little more flimsy when you open and close it; it will twist some since that under tray does provide some structural rigidity. A long time ago, I had a Fiber Images hood custom made where there was no undertray like that. It was just the support around the edges and the middle was only the carbon. If you pushed down in the middle, it would flex some. Other than that, it was fine. No issues with anything while driving.

It is weird to see your hood twist and flex when opening and closing, so make sure you can live with that before cutting it off. Can you just trim the part that's rubbing?

robc1976 · 11-04-2014, 02:24 PM

Quote:

Originally Posted by shadow191

It won't really hurt anything. The hood will be a little more flimsy when you open and close it; it will twist some since that under tray does provide some structural rigidity. A long time ago, I had a Fiber Images hood custom made where there was no undertray like that. It was just the support around the edges and the middle was only the carbon. If you pushed down in the middle, it would flex some. Other than that, it was fine. No issues with anything while driving.

It is weird to see your hood twist and flex when opening and closing, so make sure you can live with that before cutting it off. Can you just trim the part that's rubbing?

I was Just going to remove the part that is rubbing. The undertray on this hood is loose as could be, don't see how it does anything. I can move it 1" with my pinky finger lol!

shadow191 · 11-04-2014, 02:27 PM

I think it's just there for torsional rigidity. So it's not attached to the skin in the middle, but it still keeps the overall hood from flexing. But cutting just the part that is rubbing won't impact anything.

robc1976 · 11-04-2014, 02:29 PM

Quote:

Originally Posted by shadow191

I think it's just there for torsional rigidity. So it's not attached to the skin in the middle, but it still keeps the overall hood from flexing. But cutting just the part that is rubbing won't impact anything.

cutting it out now, it is weird it rubs on only 1 side, probably not made perfect (undertray).

11-03-2014, 03:54 PM	#1
robc1976 DIYER 614 Rep 5,521 Posts Drives: E90 335i Join Date: Mar 2012 Location: Illinois iTrader: (14)	removing undertray from carbon fiber hood I have a JL-Motoring carbon fiber hood and a small part of the under tray hits my strut bar. The undertray doesn't appear to do anything, it is very loose and not connected to actual hood except on sides. sometimes rattles against underside of hood. would it hurt anything to remove a portion of it? __________________ JB4 G5, Stage 3 LPFP, Stage 2 MOTIV PI, VM 6466 ST, Custom OCC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, HPA rear toe arms, Wavetrac LSD, HPF Gen 2, DEFIV kit, KW clubsport, Delrin solid SF bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, M3 fenders, M3 OEM sideskirts, Mtech rear bumper, CSL trunk, MORR VS8.2 rims 245/295
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11-03-2014, 04:01 PM	#2
robc1976 DIYER 614 Rep 5,521 Posts Drives: E90 335i Join Date: Mar 2012 Location: Illinois iTrader: (14)	Here is the portion I want to remove Attached Images __________________ JB4 G5, Stage 3 LPFP, Stage 2 MOTIV PI, VM 6466 ST, Custom OCC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, HPA rear toe arms, Wavetrac LSD, HPF Gen 2, DEFIV kit, KW clubsport, Delrin solid SF bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, M3 fenders, M3 OEM sideskirts, Mtech rear bumper, CSL trunk, MORR VS8.2 rims 245/295
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11-04-2014, 12:57 AM	#3
robc1976 DIYER 614 Rep 5,521 Posts Drives: E90 335i Join Date: Mar 2012 Location: Illinois iTrader: (14)	I actually circled wrong part, it is the pillar to the left __________________ JB4 G5, Stage 3 LPFP, Stage 2 MOTIV PI, VM 6466 ST, Custom OCC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, HPA rear toe arms, Wavetrac LSD, HPF Gen 2, DEFIV kit, KW clubsport, Delrin solid SF bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, M3 fenders, M3 OEM sideskirts, Mtech rear bumper, CSL trunk, MORR VS8.2 rims 245/295
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11-04-2014, 04:24 AM	#4
_ink Jedi samurai ninja turtle 619 Rep 3,021 Posts Drives: X3 M40i 2018 Join Date: May 2012 Location: Sydney, Australia iTrader: (0) Garage List 2018 X3 M40i [0.00]	Rob, I'd just put some of that black padding tape there, which will give a cushioned contact and eliminate vibrations.
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11-04-2014, 07:19 AM	#5
comablaqq Private First Class 14 Rep 103 Posts Drives: e92 335i Join Date: Mar 2014 Location: Brisbane, Australia iTrader: (1)	It's probably structural, but I'd be more concerned about getting rid of that awful chrome on the intake filters..
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11-04-2014, 08:07 AM	#6
shadow191 Lieutenant Colonel 181 Rep 1,681 Posts Drives: 2017 Volvo XC90 R-Design Join Date: Dec 2012 Location: GA iTrader: (3)	It won't really hurt anything. The hood will be a little more flimsy when you open and close it; it will twist some since that under tray does provide some structural rigidity. A long time ago, I had a Fiber Images hood custom made where there was no undertray like that. It was just the support around the edges and the middle was only the carbon. If you pushed down in the middle, it would flex some. Other than that, it was fine. No issues with anything while driving. It is weird to see your hood twist and flex when opening and closing, so make sure you can live with that before cutting it off. Can you just trim the part that's rubbing?
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11-04-2014, 02:27 PM	#8
shadow191 Lieutenant Colonel 181 Rep 1,681 Posts Drives: 2017 Volvo XC90 R-Design Join Date: Dec 2012 Location: GA iTrader: (3)	I think it's just there for torsional rigidity. So it's not attached to the skin in the middle, but it still keeps the overall hood from flexing. But cutting just the part that is rubbing won't impact anything.
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