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 Project Infiniti G20 racecar race car P10 Primera SR20 rollcage roll cage interior 

By Martin Gonzales & Steve Rockwood

 

 

Check out the rest of our Project Infiniti G20 Racecar build click here!

   
Last time you saw Project G20 we were pounding the final nails in the coffin of its daily driven days with the addition of its roll cage, but we weren't quite done yet.  There were still some inexpensive, yet effective, ideas we had to help improve the safety and rigity of our already stout roll cage.  We’ll be going over the details of these additions as well as the steps to our interior's final prep and finish.

We once again took a trip to Revenge Motorsports in Escondido, CA to give John our fabrication wish list.  This time our list included pillar and firewall gussets, a crash attenuator and “bull-horn” bars.  Did we pique your interest yet?
   
Back when we originally designed our cage the A and B pillar gussets carried a 30lb weight penalty according to rules of NASA's SR Cup class, but we felt it was an insignificant amount of weight considering the added benefits to safety and rigidity.  Now that SR20 powered cars don't have thier own class, our G20 falls under the regulations of NASA's Performance Touring Class.  Though not specifically mentioned in the 2010 NASA Club Codes and Regulations, some of the additions we'll be going over will be assesed additional "class points" according to the NASA's Performance Touring Car Classification Form.  

 

Project Infiniti G20 racecar race car P10 Primera SR20 rollcage
            roll cage interior

B-pillar gusset

 

Looking at them you wouldn't think they were very strong or would add much to the structure of the car.  After all, they are made of fairly thin 18g steel.  The secret to their strength is the special punch used to create the holes in the gussets.  The hole the punch leaves behind not only lightens the gusset, but the ridge helps strengthens the structure by adding a third dimension to it.  The weight difference is nearly negligible, but the difference in strength is amazing.  Before the holes were punched we could easily bend the plate with our hands, but once the holes were there it was nearly impossible to bend without tools.

Project Infiniti G20 racecar race car P10 Primera SR20 rollcage
            roll cage interior

The ridge around the holes in this A-pillar gusset help strengthen it.

 

 

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Comments
Steve
Stevelink
Sunday, April 25, 2010 4:10 AM
With the bullhorn bar, why the bends vs. straight triangulation? Does it work out to be stronger(stiffer)?

The side impact parts are really great; for years open wheel cars have started with the idea that in a side impact it should start away from the driver and collapse, absorbing energy away from the tub unlike the straight tubular monocoque cars of the 60's and 70's (think old Colin Chapman Lotus F1/F2).

Looking good!
brainrush
brainrushlink
Sunday, April 25, 2010 9:48 AM
Some good info in here, especially reguarding the sealant removal and the spray paint triggers. it looks good.
Rockwood
Rockwoodlink
Monday, April 26, 2010 10:39 AM
The bullhorn bar was bent because the fabricator wanted as wide a footpring on the bottom and to follow the spare tire well countours as close as is possible. As a result, the bends needed to clear out of the spare tire well ended up a little too steep and needed the extra bends you see in the picture to meet the tops of the towers.

Now, the bend makes it slightly weaker, but this isn't a problem for any type of normal use this car will see, and is still considerably stronger than the subframe it's designed to support.
trailbrake2088
trailbrake2088link
Friday, February 04, 2011 6:13 PM
I didn't see this g20 in the project car forum but I have a question. What size rims and tires are you running? And what springs and shocks are you using?
Martin Gonzales
Martin Gonzaleslink
Saturday, February 05, 2011 3:16 AM
The wheels are 15x7 Team Dynamics Pro Race wrapped in 225/45 Hankooks z214s.

You'll have to wait for the next update for the rest of the details. Give me a month or two and I'll have a couple more articles up.
Viprdude
Viprdudelink
Wednesday, September 05, 2012 7:35 AM
Please moar updates, sirs.
Martin Gonzales
Martin Gonzaleslink
Wednesday, September 05, 2012 7:49 AM
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