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Old 12-17-2009, 01:29 PM   #1
3258
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Default Super Class rule clarification

It seems like everybody uses a throttle stop in the form of restricting air flow into the intake manifold in the .90 classes to kill ET.

I was looking at the NHRA rule book, and I did not see anything that prohibited other forms of slowing the car down, or that said that airflow restriction is the only acceptable method of killing E.T. Can somebody set me straight on what is, and is not acceptable for super class racing? Maybe I am not looking in the right part of the book.
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Old 12-17-2009, 04:43 PM   #2
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Default Re: Super Class rule clarification

any means just short of using the ingnition..........a T/S, a bolt, just lifting, but no stutter.

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Old 12-17-2009, 07:13 PM   #3
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Default Re: Super Class rule clarification

how about cutting fuel on an injection system? any problem with that?
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Old 12-17-2009, 07:14 PM   #4
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Default Re: Super Class rule clarification

No Limiting RPM chip in the ignition during the run which is basically what Rick said no stutter.
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Old 12-22-2009, 12:37 PM   #5
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Default Re: Super Class rule clarification

You can also use weigth to slow the E.T. the rule od thumb is every 10lbs is .01 and every 100lbs is .10 but there is a limit to how much removeable weight you can have so you would have to set the car up to run .10 to .20 under the index without any weight and add the weight as needed.
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Old 12-22-2009, 12:56 PM   #6
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Default Re: Super Class rule clarification

Thanks for the feedback guys. So i have not found anything in the rule book about fuel cut methods of RPM limiting, and nobody has said anything about not doing it...... so do i assume it is OK?
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Old 12-22-2009, 03:23 PM   #7
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Thumbs up Re: Super Class rule clarification

Quote:
Originally Posted by 3258 View Post
Thanks for the feedback guys. So i have not found anything in the rule book about fuel cut methods of RPM limiting, and nobody has said anything about not doing it...... so do i assume it is OK?
I would think if cutting fuel makes it stutter or pop and snap it would be considered a stutter and would not pass. if it cuts rpm without the stutter and is smooth sounding it may work .only thing is i would not want my fuel cut back and ruin a motor.
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Old 12-23-2009, 07:42 AM   #8
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Default Re: Super Class rule clarification

Thanks for the reply. I do not think i would cut fuel on a carb or mechanical injected engine, not sure that you could do that without potentially causing some problems as you said. I am not running either of those options so I think it may be possible, I just was not sure if it was legal.
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Old 12-24-2009, 09:49 AM   #9
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Default Re: Super Class rule clarification

The guys that run the electronic fuel injection use a switch on the TS that tells the computer to run a different map profile while on the stop.
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Old 12-26-2009, 09:57 AM   #10
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Default Re: Super Class rule clarification

Ok, I have a question on this.. I have heard many sides of electronic devices to control down track speeds....

Here is a question: IF my motor has a redline of say 7800rpm, and I use a 7500 rpm chip, lets say the car hits the high side chip at 1100' into the run...... You guys are saying this is not legal? So I am supposed to put a higher chip in and take a chance of over-reving the motor and breaking it????
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