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Lexan windows, what are downsides?

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22 replies to this topic

#1
changster

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Anyone have experience driving around with Lexan windows? 

 

If you assume you can still have power windows and the fitment is good, does it still suck to have Lexan windows? I know it's easier to scratch.

 

http://www.plastics4...window-kit.html


- 4.4 liter Alpha 12 built by TSM (R.I.P)
- 4.1 liter ER/ETS 6466 built myself with the help of everyone.

- 4.2 liter billet block <? big boy kit> coming.

 

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#2
thehelix112

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I highly doubt you can lexan the door windows without a lot of work. Lexan is flimsy as fuck. Think that's why ams built a custom upper channel for their door ones to locate and give it strength.

B pillar and rear windscreen would be simpler to do.

Dave

Edited by thehelix112, 14 January 2017 - 10:43 PM.

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#3
thehelix112

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You can see the support brackets here http://blog.amsperfo...ord_exhaust.jpg
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#4
Tony1

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Yeah, you don't want to do lexan in a street car. 


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#5
changster

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Yeah, you don't want to do lexan in a street car. 

 

Because it'll be bending and flapping everywhere under the wind?


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- 4.4 liter Alpha 12 built by TSM (R.I.P)
- 4.1 liter ER/ETS 6466 built myself with the help of everyone.

- 4.2 liter billet block <? big boy kit> coming.

 

13180940063_33e81c30d6_z.jpg


#6
Dan_585

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I don't think lexan windows are street legal either. But then again neither is most of the stuff on our cars lol



#7
Tony1

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Yeah, lexan door windows need a frame.  Since the GTR doesn't have an upper frame around the window like some cars, if you put a flexible window in there it'll pull out on top at high speed unless you build a frame for it.   At that point, power windows are out the door, but you can save a lot more weight since you're ditching everything inside the door.   Not worth it in a street car though, cons far outweigh the pros. 


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#8
elf_cruiser

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I wpuld also argue that lexan isn't much lighter than glass by volume. So the real weight savings from lexan has to come from the thickness. You would need to do like .120 or .095 thick windows, which would be very flimsy and would only save a few lbs. my glass windows are out of the car and they don't weigh more than 7-8 lbs each.

2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

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Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#9
elf_cruiser

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The rear glass would be the best place to try for weight savings...

2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

facebook.com/DangerousEnterprises

Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#10
shawnhayes

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The rear glass would be the best place to try for weight savings...

 

Roger that., 

 

And the front, but then you have to add the support frames as well, and won't be street legal and totally obvious to the cops and everyone else.

 

Shawn



#11
bpauto

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Hey Changster,

 

We run Lexan windows in our Overtake carbon GT-R (front, door, rears)

 

(

 

If your trying to save weight by replacing the OEM glass this is a great option, however they are certain things which we've learned from running Lexan windows that I want to

bring to your attention.

 

You won't be able to run the windshield wipers as they will scratch the windshield, so driving in the rain is...interesting 

 

Secondly, you'll have issues attaching the rear view mirror to the window (ours fell off a few times) we had to use an industrial strength adhesive 

 

We also found it unnecessary to reinforce the driver and passenger doors, the Lexan replacements we used fit almost perfectly.

 

To answer your question if it sucks: No, Not really, but i wouldn't recommend it for street use, ever.

The main reason race cars use Lexan is that it doesn't shatter similar to how glass would on impact.

 

Hope this helps!

 

-Jon


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#12
Tony1

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How fast have you been in this car since doing the lexan?

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#13
bpauto

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How fast have you been in this car since doing the lexan?

 

>100mph many times, but as far as exact speed, don't remember exactly.


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#14
Tony1

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Interesting. Is it thicker than .125"?

The lexan that's on my car and Gidi's car are perfect fit, it's an exact replica of the stock glass, but without a frame they will pull away from the roof line at high speed.

In the street world, 100mph is fast, on a race car, it's nothing. Maybe this is happening over 150mph, something MOST street cars would rarely see but something a car like mine sees much more than.

I would be absolutely blown away if an 1/8" lexan window on a GTR, in a factory fitment configuration, would hold up anywhere near the top speed of a stock GTR.
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#15
changster

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Thanks for the color guys.

 

I was only looking at this because it looks like it can save up to 80lbs from my little Miss Piggy (4050lbs!).

 

Onto the next...


- 4.4 liter Alpha 12 built by TSM (R.I.P)
- 4.1 liter ER/ETS 6466 built myself with the help of everyone.

- 4.2 liter billet block <? big boy kit> coming.

 

13180940063_33e81c30d6_z.jpg


#16
bpauto

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Interesting. Is it thicker than .125"?

The lexan that's on my car and Gidi's car are perfect fit, it's an exact replica of the stock glass, but without a frame they will pull away from the roof line at high speed.

In the street world, 100mph is fast, on a race car, it's nothing. Maybe this is happening over 150mph, something MOST street cars would rarely see but something a car like mine sees much more than.

I would be absolutely blown away if an 1/8" lexan window on a GTR, in a factory fitment configuration, would hold up anywhere near the top speed of a stock GTR.

 

Yeah, the door glass definitely starts to hover just a tiny bit at speeds over 100mph, but not enough where a dramatic amount of air is getting behind. 


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#17
Tony1

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Not too far past the window starting to pull out a bit is the window flying off the car! lol


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#18
mikelmarion

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old thread update.  Have any of you guys tried optic Armour? Supposed to be superior to lexan in clarity and a few other details.  They offer pre cut drop ins that look exactly like oem.  Even tinted versions 


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#19
elf_cruiser

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I'll check that out. I've got to make some lexan windows in the next few weeks anyways...
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2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

facebook.com/DangerousEnterprises

Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#20
elf_cruiser

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Combed through their web site - http://www.opticarmo...com/default.asp

Nothing for the R35 :(
It sounds like they do custom windows but I'm sure it's expensive...
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2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

facebook.com/DangerousEnterprises

Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe





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