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#1 Tim Wood

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Posted 10 April 2020 - 05:22 PM

It shows in USRA rules 2020 the height in rear from the tech block to the top of the spoiler is 1 1/2" and you have to have at least 1/8" rear bumper. Am I reading this correct. that seems to be low for rear of body. Thanks, Tim


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#2 Rotorranch

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Posted 10 April 2020 - 05:32 PM

1 1/2 is what I measured on my old cars.


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#3 Jason Holmes

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Posted 10 April 2020 - 10:36 PM

Tim

 

Yes 4" is 1.5" and 4.5" is 1.625 rear spoiler height 

 

jason 

 

That's the way it's been for Yearrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr's 


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#4 Fast Freddie

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Posted 11 April 2020 - 10:35 AM

Keep in mind that they are now measuring the body height on a relieved tech block like ISRA.  That means a body cut to exactly 1 1/2 in and mounted on the chassis no matter what the tire size will remain 1 1/2 in when teched in.  Just don't go over the 1 1/2 or it will be easily noticed and failed at tech.


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Fred Younkin

#5 Tim Wood

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Posted 11 April 2020 - 01:12 PM

Keep in mind that they are now measuring the body height on a relieved tech block like ISRA.  That means a body cut to exactly 1 1/2 in and mounted on the chassis no matter what the tire size will remain 1 1/2 in when teched in.  Just don't go over the 1 1/2 or it will be easily noticed and failed at tech.

Fred, Thanks for the clarification with the tech block. 


Tim Wood 


#6 Jason Holmes

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Posted 11 April 2020 - 03:56 PM

Tim

 

Shoot for 1.45 all will be good when you tire up it will be 1.77 min-1.9+ 

 

jason


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#7 Tim Wood

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Posted 11 April 2020 - 06:28 PM

Tim

 

Shoot for 1.45 all will be good when you tire up it will be 1.77 min-1.9+ 

 

jason

Thanks  Jason 


Tim Wood 


#8 Fast Freddie

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Posted 12 April 2020 - 11:21 AM

OK Jason, why would you not want to shoot for the maximum height allowed?  Since tire diameter no longer affects the body height.  Just asking, maybe you 're giving everyone a free performance tip, could that be it?


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Fred Younkin

#9 Tim Neja

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Posted 13 April 2020 - 09:11 AM

So the body height in ISRA is measured from the chassis--independant of the tire diameter?  That's far simpler and makes sense.


She's real fine, my 409!!!

#10 Fast Freddie

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Posted 13 April 2020 - 02:00 PM

It would have made even more sense 20 years ago when I bitched about it then.  Body height should measure the height of the body not the height of a ready to race car. Many manufactures would put cut lines on a body that would never pass tech because the old rule didn't allow for tire diameter, now it does.  HOORAY!!!!!!!!!!!


Fred Younkin

#11 Jason Holmes

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Posted 13 April 2020 - 09:02 PM

Fred 

 

If you can hit it dead nut have at it I gave him 5 thou that's really not that much nail that 1.5 and if your a 1 thou over to your pits fix it and remember if there is a mid race tech and you have just tweeked you body and it springs back you get to fix it under green so for me I'd play it a little on the safe side and Tim and myself are good friends and I sure he knows what I was trying to pass along

 

jason


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#12 Fast Freddie

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Posted 14 April 2020 - 11:01 AM

I think you missed my point Jason but that's OK I forgive you.  I was just saying that I'm finally glad the USRA has conceited to measuring the body height correctly and I'm sure that there isn't a single racer out there that would push the envelope and try to hit the 1.50 inch height dead nuts.  How about you?


Fred Younkin





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