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  #11  
Old 01-30-2014, 12:43 PM
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Originally Posted by OBeer-WAN-Kenobi View Post
Not to mention, possibly pole vaulting the car ass over tea kettle.
Has this ever really happened?
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  #12  
Old 01-30-2014, 01:31 PM
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Originally Posted by TheJDMan View Post
Most rule books specify the DS loop be located no more than 6" behind the front U-joint. If you happen to have sub frame connectors installed that is a good place to mount a DS loop. There is no rule pertaining to the exhaust that I have ever seen.
Yup, yup. Agreed.

Ideally, the H and/or X pipes are placed at the optimum distance in the exhaust system to help relieve the "exhaust pulse traffic" to increase power. Of course packaging can be a challenge, preventing us from placing them at the optimum points. But if the H and/or X are placed too far from optimum, they will actually hurt power output.

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  #13  
Old 01-31-2014, 12:19 AM
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Originally Posted by 67Rally View Post
Has this ever really happened?
i HAVE HEARD IT HAS BUT NEVER SEEN ONE LIVE (THANK GOD) I HAVE SEEN THE FRONT OF A DS BREAK, HIT THE GROUND AND THEN FOLD IN HALF AND TAKE OUT A REAR TIRE

THEY SAY THIS HAPPEN BECAUSE OF THE DS BREAKING AT THE FRONT IDK HARD TO TELL

@ 8 SEC

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  #14  
Old 01-31-2014, 12:21 AM
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Originally Posted by 67Rally View Post
Yes, it would still hit the ground, but it would just drag. I think the real fear is that if the front lets go, it could tear up the tunnel and anything (anyone) directly above it.

There's no reason why you couldn't run two loops. One front and one rear, but the NHRA rules require only the front one.
SOME CARS IN NHRA REQUIRE 2 LOOPS
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  #15  
Old 01-31-2014, 06:54 AM
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Originally Posted by intocarss View Post
SOME CARS IN NHRA REQUIRE 2 LOOPS
I wasn't even thinking about those classes. That was me speaking out of ignorance, thanks for pointing that out.
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  #16  
Old 01-31-2014, 10:29 AM
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Fighting a similar packaging issue, it seems magnaflow likes to put the x-pipe in there exhaust kits right inline where a DS loop would go per NHRA spec
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  #17  
Old 02-01-2014, 02:46 AM
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You have to follow the rules. But in reality an X pipe will keep the DS from hitting the ground..How can the DS get passed the X
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  #18  
Old 02-01-2014, 11:01 PM
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Quote:
Originally Posted by intocarss View Post
You have to follow the rules. But in reality an X pipe will keep the DS from hitting the ground..How can the DS get passed the X
An X pipe MIGHT keep the drive shaft from hitting the ground or, more likely, the DS would simply rip the exhaust out from under the car. Regardless, the X pipe would do nothing to prevent the shaft from tearing through the floorboard. In any case an X pipe would never be considered an alternative for the DS loop by any santioning body.
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Last edited by TheJDMan; 02-01-2014 at 11:17 PM.
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  #19  
Old 02-02-2014, 12:38 PM
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I still need to see if I want to connect the loop to my subframe connectors or run it straight back off the transmission mount.

But, if I ran it straight back from the trans mount, would the NHRA view two 1.5"x1/4" pieces of steel running parallel, but not connected to each other as good as one 2"x1/4" piece of steel. The ONLY reason I ask is that I already have some 1.5"x1/4" steel stock lying around. The loop itself would be 2"x1/4", and the plate that bolts to the trans would be something like 4"x3"x1/4"

Forgive my Microsoft Paint sketch. If I run a DS loop off the trans mount, this would be a top view with the transmission on the left of the picture. The DS would pass through the loop and out to the right.

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  #20  
Old 02-02-2014, 04:27 PM
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I think Myth Busters did an experiment with trying to launch the car with a broken driveshaft....if I'm remembering correctly, they couldn't get a car to do it....
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