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-   .90 Heads Up Class Racing Tech (https://classracer.com/classforum/forumdisplay.php?f=7)
-   -   Super Class rule clarification (https://classracer.com/classforum/showthread.php?t=22500)

3258 12-17-2009 02:29 PM
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.

Rick Bailey 12-17-2009 05:43 PM
Re: Super Class rule clarification
 
any means just short of using the ingnition..........a T/S, a bolt, just lifting, but no stutter.

Rick

3258 12-17-2009 08:13 PM
Re: Super Class rule clarification
 
how about cutting fuel on an injection system? any problem with that?

63corvette 12-17-2009 08:14 PM
Re: Super Class rule clarification
 
No Limiting RPM chip in the ignition during the run which is basically what Rick said no stutter.
My 2 Cents

mbong66 12-22-2009 01:37 PM
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.

3258 12-22-2009 01:56 PM
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?

danny waters sr 12-22-2009 04:23 PM
Re: Super Class rule clarification
 
Quote:
Originally Posted by 3258 (Post 158366)
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.

3258 12-23-2009 08:42 AM
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.

voltdr 12-24-2009 10:49 AM
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.

Freddie 12-26-2009 10:57 AM
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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