Driveshaft Loop Required w/Slicks NHRA Rules

Discussion in 'SRT Hellcat General Discussions' started by B5 Blue, Feb 6, 2015.

  1. B5 Blue

    B5 Blue Platinum Member

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    Investigating this reveals that unless there is a crossmember to catch the front of the driveshaft (which I don't have a car to check and in the past always holds the rear trans mount on old B and E cars leaving the shaft open i.e needs loop) NHRA rules shows it requires a driveshaft loop section 2:4. This means drilling the floor pan and I won't do that to mine. In summary slicks=loop. Street tires running quicker than 11.49 1.4 mile or 7.35 1/8 mile=loop.

    Any NHRA inspectors in here?

    Driveshaft Loop.PNG

    Driveshaft Loop 2.PNG
     
  2. CubeMan

    CubeMan Tri-State Overlord

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    1) i thought this only applied to modified cars, not stock ones. Cause rollcages are going to be needed also then right?

    welp good thing drag racing is all about consistent times now, not whos faster. Just nail your times with street tires and you'll be good.
     
  3. Next Phase

    Next Phase Silver Member

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    Safety first... This isn't going to be a collector car, if you are going to be drag racing heavily, nothing wrong with adding the loop. Just my 2 cents.

    The track I go to is really lax with rules...most of my time is during private track days.
     
  4. hellcat1

    hellcat1 Gold Member

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    I believe our cars already have this loop
     

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  5. Next Phase

    Next Phase Silver Member

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    I'm wondering if having a trans tunnel cover (like in the Vipers) will suffice for this requirement. I've never seen a track Inspect a car that heavily
     
  6. B5 Blue

    B5 Blue Platinum Member

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    It's not just for the tunnel which is why they state OPEN shaft and I disagree on the collector car thing. All the Prius, Ann Arbor and Cali tree huggers along with MAHC will see to it.
     
  7. Furyous64

    Furyous64 Senior Hellcat Member

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    If the car is not modified you can run much faster than 11.49 before they require additional safety equipment. I would think the Hellcat has everything it needs to run safely otherwise the NHRA would not have certified the times on DR's at 10.8. As soon as you modify the car, that is if the inspector can tell, he may not let you run at all if he wants to be a stickler.
     
  8. bolivarshagnasty

    bolivarshagnasty Gold Member

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    That is called a carrier bearing and is standard on any two piece driveshaft. A loop would be used so that the half of the driveshaft that twisted apart would not drop down to the pavement and catapult the car sending it out of control. In my opinion, if you are going to run drag radials on the Hellcat, it would be wise to install a driveshaft safety loop. An ounce of prevention..............
     
  9. RadCat

    RadCat Left Shark

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    So a 2-piece drive shaft would require two loops...to really contain it from beating the snot out of your floor pan or pole vaulting the car.
     
  10. mopar sickness

    mopar sickness Silver Member

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    Read the section on production vehicles in the nhra rules.as long is there no structural modes your good
     
  11. Top Cat

    Top Cat Gold Member Hellcat Car Club Gold Supporting Member Fastest Cat/Record Holder HCC Charter Member

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    One of the reasons we use carbon fiber shafts in all our race cars, if they let go all they do is disintegrate into small pieces. We have seen local tracks getting a bit more strict last year in the Mid Atlantic region, 11.49 was a magic number which a lot wanted roll bars, we even had state troopers in tech watching at some tracks in New Jersey.
     
  12. Furyous64

    Furyous64 Senior Hellcat Member

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    That's crazy considering it seems like the NHRA is getting a bit more lenient lately. You use to not be able to change anything on the car or it would be considered modified and you could no longer skate by the roll bar nazis. Everything had to be OEM or appear to be OEM. Now it seems a few guidelines have changed and as long as whatever you put on the car is put in the stock location it's ok. NHRA production car guidelines does not require a roll bar unless faster than 135mph I believe. Roll cage required faster than 9.99 E.T. Then again whoever is running tech can decide whatever he wants I suppose.
     
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  13. B5 Blue

    B5 Blue Platinum Member

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    Can't find it yet
     
  14. Furyous64

    Furyous64 Senior Hellcat Member

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    I believe its Section 10 of the 2015 NHRA rule book. "Factory Stock" is the category
     

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