Gen V Weight Reduction

[ForTehNguyen]

I have this information about the wheels and rotors i recorded in a spreadsheet from a thread:
Sidewinder II Wheels F/R: 18.42#/22.92#
Venom Wheels F/R: 24.3#/28#
Rattler Wheels F/R: 26.2#/29.3#
ACR Wheels F/R: 26#/27.8#
Stock 1 Piece Rotors F/R: 26.5#/24.4#
Stoptech 2 Piece Rotors F/R: 17.8#/17.8#

[TheStig]

What about the CCB ACR rotors and calipers?

[Robert Linton]

2900 Lbs. or even 2500 lbs. is doable with re-engineering of many components not merely changing a few parts. It will improve the car in many ways but to do it correctly and safely will be very expensive, i.e., hundreds of thousands of dollars for one car (less in multiples of 10).

[Snakebit10]

/\ /\ Yep. Money no object it would be the way to go to have the ultimate ACR.

[Arizona Vipers]

2900 Lbs. or even 2500 lbs. is doable with re-engineering of many components not merely changing a few parts. It will improve the car in many ways but to do it correctly and safely will be very expensive, i.e., hundreds of thousands of dollars for one car (less in multiples of 10).

2500 is not possible. There's just no way to take more out of this car everything is so light. 2910-2930 is the lowest anyone could get. When I was 2990 the only thing left to take out would be door panels, dash and carpet which I would say weigh about 60 lbs max. A race drivers seat would drop another 25-30. The body panels are already carbon fiber and the glass is extremely thin. The side glass and all hardware in the door was less than 5 lbs a side. Gilles wanted this car to be light and he succeeded.

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What about the CCB ACR rotors and calipers?

They are lighter, but the knuckles you have to use are a few pounds heavier each.

[ACRucrazy]

2500 is not possible. There's just no way to take more out of this car everything is so light. 2910-2930 is the lowest anyone could get. When I was 2990 the only thing left to take out would be door panels, dash and carpet which I would say weigh about 60 lbs max. A race drivers seat would drop another 25-30. The body panels are already carbon fiber and the glass is extremely thin. The side glass and all hardware in the door was less than 5 lbs a side. Gilles wanted this car to be light and he succeeded.

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They are lighter, but the knuckles you have to use are a few pounds heavier each.

Sounds like a challenge! Haha.

http://oppositelock.kinja.com/americ...709/1621122351

[Snakebit10]

Check this thread out. Not Viper related but gives an idea of what is possible but with lots of disposable moolah.

https://rennlist.com/forums/991-gt3-...reduction.html

[Voice of Reason]

At the end of the day the Viper has a steel frame and a large engine, unless someone were to design a carbon fiber monocoque at a cost of millions and re-engineer every other body and suspension component to work with it there is no hope for a 2,500 lb Viper.

[Mclarengts]

You should put an itemized sticky together, it would be invaluable. A very nice end result.

It would be nice to have a sticky on this topic for sure. I would recommend though that every weight saving idea should include, in addition to the actual weight saved, the cost of the mod and the difficulty of installing the mod. For example, the IPSCO underdrive pulley may save a couple of pounds but it is really easy to install and costs about $150. It also reduces rpms on the accessories when pushing the motor to high rpms which is another benefit. I assume the lithium ion battery is easy to install, saves some 25 pounds, and costs what $800 or so? Titanium lug nuts would be real easy to install, save 1.3 pounds but I don't know how much they cost..

that's exactly what I hoped for when starting this thread

[Mclarengts]

Stoptech 2 Piece Rotors F/R: 17.8#/17.8#

do you know how much the stock 2 piece TA Rotors are?

[serpent]

2900 Lbs. or even 2500 lbs. is doable with re-engineering of many components not merely changing a few parts. It will improve the car in many ways but to do it correctly and safely will be very expensive, i.e., hundreds of thousands of dollars for one car (less in multiples of 10).

Lol, the race cars aren’t even that light. No way it can be down to 2500lbs.

http://www.torquenews.com/106/imsa-a...-race-cars/amp

[TrackAire]

I always admired this Z06 for having a full interior, a/c and sound deadening. Was under 2780 lbs with only a couple of gallons of gas, lightweight clutch and carbon fiber wheels. Owner then put in a heavier clutch for better drivability and sold the carbon fiber wheels and was still around the 2800 lb mark. That is very light for a streetable car with around 600 rwhp.

https://www.corvetteforum.com/forums...-magazine.html

Anything under 2900 lbs that is street-able with full interior and A/C is very light.

[38D]

Anyone that has the skills/people/tooling to create full autoclaved carbon fiber 964 trailing arms can definitely get an ACR to 2500lbs if he wanted too.

[SharpMan]

Anyone that has the skills/people/tooling to create full autoclaved carbon fiber 964 trailing arms can definitely get an ACR to 2500lbs if he wanted too.

This!

[Mclarengts]

what about a solid 2950-3000lbs

[Arizona Vipers]

what about a solid 2950-3000lbs

That's easy on a non-ACR

[Arizona Vipers]

Anyone that has the skills/people/tooling to create full autoclaved carbon fiber 964 trailing arms can definitely get an ACR to 2500lbs if he wanted too.

How? Even with a fully gutted car you are going to be around 3000 lbs in an ACR if you have the passenger seat out and race seat etc, AC and windows gone.
Are you saying to make a carbon fiber frame and all carbon fiber suspension parts? Even that wouldn't drop the car another 500 lbs

[SharpMan]

How? Even with a fully gutted car you are going to be around 3000 lbs in an ACR if you have the passenger seat out and race seat etc, AC and windows gone.
Are you saying to make a carbon fiber frame and all carbon fiber suspension parts? Even that wouldn't drop the car another 500 lbs

You need to look at this: https://rennlist.com/forums/964-foru...ed-thread.html Robert isn't just speculating. It's what he has done.

[serpent]

You need to look at this: https://rennlist.com/forums/964-foru...ed-thread.html Robert isn't just speculating. It's what he has done.

How about a direct link, dont want to sift through all that crap.

All these comments on getting the car down to 2500lbs is speculation, the race teams who spend millions havent even gotten it down to 2500lbs. Until its done, it isnt feasible.

I'll wait for that 2500lbs viper. LOL

[PkB2014]

How about a direct link, dont want to sift through all that crap.

All these comments on getting the car down to 2500lbs is speculation, the race teams who spend millions havent even gotten it down to 2500lbs. Until its done, it isnt feasible.

I'll wait for that 2500lbs viper. LOL

Exactly, the GT3-R empty weight is still 2855lbs. Curb weight should be just under 3000lbs or so depending on the measurement used.

[Arizona Vipers]

You need to look at this: https://rennlist.com/forums/964-foru...ed-thread.html Robert isn't just speculating. It's what he has done.

Yeah, that's an amazing Porsche on there. He's got AMAZING skills and drive and patience! But if he "isn't speculating" and built a 2500 lb ACR, you posted the wrong link.

[SharpMan]

Yeah, that's an amazing Porsche on there. He's got AMAZING skills and drive and patience! But if he "isn't speculating" and built a 2500 lb ACR, you posted the wrong link.

Fair enough...I should have chosen my words more carefully. He is speculating regarding a 2,500lb viper but it's based on extensive expertise and experience.

The other link regarding the 911R is perhaps more relevant anyway and it seems that significant lengths are required to remove 50kg.

All that said...damn if I wouldn't like to see carbon suspension arms when I pop my hood!

[Voice of Reason]

2,500 lbs would be a neat trick since I’d bet one of these rolling chassis are close to that already. That why I’m saying it would take millions to develop a carbon fiber monoque and at that point you don’t really have a Viper anymore.

http://www.gettyimages.com/event/dod...re-id472614228

[512BB]

2500 is not possible.

OMG you are soooooooooooooo wrong, drop in a Miata four banger in there instead of the current V100 and the Viper will be down in the 1,900's!

Think of it as a www.flyinmiata.com in reverse!

[Arizona Vipers]

Fair enough...I should have chosen my words more carefully. He is speculating regarding a 2,500lb viper but it's based on extensive expertise and experience.

The other link regarding the 911R is perhaps more relevant anyway and it seems that significant lengths are required to remove 50kg.

All that said...damn if I wouldn't like to see carbon suspension arms when I pop my hood!

Yeah some good stuff on there too, does anyone make lightweight alternators/strarters that bolt up for us? And who sells titanium springs? I'm sure their rate progressions would be different than steel and wouldn't work correctly with the Bilstein's.
I wonder if the strength is the same and safe for the track. I know technically it's stronger than aluminum under most circumstances, but it can crack in certain situations.