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RX-8 Race Weight

Old 09-14-2017, 07:09 AM
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Originally Posted by RacerBowie View Post
2419...
2396 dry, no driver.

Almost ready for the Runoffs.
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Old 09-15-2017, 09:04 AM
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good luck at the runoffs!
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Old 09-19-2017, 07:19 AM
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Thanks!

Spent ALL DAY yesterday on the dyno, making decent numbers. A little more prep tonight, then in the trailer for a Friday morning roll-out to Indy.

So tired.
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Old 10-23-2017, 11:50 AM
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Does anyone have the weight for a car with tube front, rear, subframes, polycarbonate windows, fully gutted and caged, and all carbon/fiberglass body panels and doors? I'm wanting to go ***** to the wall on my time attack build after I finish my autox car and I'm just curious how low you can actually go.
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Old 10-23-2017, 11:53 AM
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Originally Posted by Ronin_Racing View Post
Does anyone have the weight for a car with tube front, rear, subframes, polycarbonate windows, fully gutted and caged, and all carbon/fiberglass body panels and doors? I'm wanting to go ***** to the wall on my time attack build after I finish my autox car and I'm just curious how low you can actually go.
Sounds costly; what classes do you intend to compete in?

Would suck to spend a ton of money and not be able to be competitive in your resulting classes.
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Old 10-23-2017, 01:47 PM
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Originally Posted by hufflepuff View Post
Sounds costly; what classes do you intend to compete in?

Would suck to spend a ton of money and not be able to be competitive in your resulting classes.
I'd be in XP class with the motor swap alone so I figured I may as well go all out with other mods. I'll need to be as light as possible to be competitive at all. I do believe that there are restrictions on under trays and some aero stuff, suspension etc. But I'll be building most of the stuff in house at first to cut down on costs.
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Old 08-29-2018, 01:12 PM
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I'm down to 2920 with 1/4 tank and me (190lbs) in the car. so low 2700s. Car is full interior street car, quiet, comfortable, A/C, radio, carpeting, cruise control, only the driver seat has been changed to a fiberglass race seat. My youtube videos have more details. Not bad.
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Old 09-01-2018, 12:18 AM
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Just over 3,000 lb w/ me (230 lb) and a couple gallons of fuel. 54% nose weight. Stock suspension for now, LS1, T56, gutted with very significant cage (hillclimb car), no front door glass but doors have not been cut at all, single Kirkey aluminum seat, full but gutted dash, full lights, wipers, column electronic power steering, stock brakes, all glass, stock body, fuel cell, 3lb battery, 17x10 RPF1 wheels w/ 255 RS3 tires.
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Old 01-24-2019, 02:06 PM
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Originally Posted by heavy85 View Post
Just over 3,000 lb w/ me (230 lb) and a couple gallons of fuel. 54% nose weight. Stock suspension for now, LS1, T56, gutted with very significant cage (hillclimb car), no front door glass but doors have not been cut at all, single Kirkey aluminum seat, full but gutted dash, full lights, wipers, column electronic power steering, stock brakes, all glass, stock body, fuel cell, 3lb battery, 17x10 RPF1 wheels w/ 255 RS3 tires.
Which region do you plan to hillclimb with? i'm planning on getting into SCCA hillclimbs this season with PHA.
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Old 02-01-2019, 10:12 AM
  #60  
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The lightest my car has weighed at impound is 2860 with me in it, so approximately 2660 without me. It's about to get a little heavier, probably, with the addition of a wing and front aero. I'm not sure where I'll take more weight out. I'll have to start getting more creative, like rewiring and such.
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Old 02-03-2019, 06:38 PM
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I'm at 2570 with about 4 gallons in the tank. No cage, full interior minus rear seats. Swapping out the renesis, PPF, rear end and stock trans saved a lot of weight.

Still need to add the splitter and wing.
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Old 02-05-2019, 10:19 AM
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Originally Posted by John V View Post
I'm at 2570 with about 4 gallons in the tank. No cage, full interior minus rear seats. Swapping out the renesis, PPF, rear end and stock trans saved a lot of weight.

Still need to add the splitter and wing.
which drive train are you running? the stock diff is so overbuilt and heavy, compare to an Evo8/9 diff i had sitting around.
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Old 02-05-2019, 11:50 AM
  #63  
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Originally Posted by trackjunkie View Post
which drive train are you running? the stock diff is so overbuilt and heavy, compare to an Evo8/9 diff i had sitting around.
Turbo 2.5L MZR

https://www.rx8club.com/rx-8-racing-...rx-8-a-267751/
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Old 02-05-2019, 05:30 PM
  #64  
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Originally Posted by NotAPreppie View Post
And an FD 5-speed trans, and an aluminum Ford 8.8 IRS rear. Both are a decent amount lighter than the stock RX-8 stuff. Removing the PPF saves a lot of weight as well even after adding an overbuilt trans crossmember.
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Old 02-06-2019, 12:51 PM
  #65  
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are there any bolt on solution to deleting the PPF while keeping the stock diff and tranny.
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Old 02-06-2019, 02:27 PM
  #66  
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The LS1RX8.com kit includes PPF delete hardware. You can use it with the Mazda factory diff but you'll have to modify the trans mount portion to deal with the fact that it's designed for GM transmissions.

You can get the diff mounting hardware here:
https://www.ls1rx8.com/store/p7/Rx8_...nting_Kit.html

Their trans mount is here:
https://www.ls1rx8.com/store/p91/Tra...ossmember.html
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Old 02-06-2019, 03:22 PM
  #67  
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that diff mount kit looks way simple to make for it to cost $600
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Old 02-06-2019, 03:28 PM
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also found this one with google search.
with the nzd to usd conversion, it's around $750 for the entire kit.

http://racefab.co.nz/RX8.html









Last edited by trackjunkie; 02-06-2019 at 03:51 PM.
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