2019 Rules Discussion

[Alien]

E: This one took a few tries to get where it is now, but we may need to revisit since apparently the TPI motors are ram air from the factory? Can you guys post better pics of the ducting? I found the top bit but not all of it. Thought we'd covered our bases here.

First off, I haven't stayed in a Holiday Inn recently, so I may be reading the rule wrong. If the radiator itself counts as a 5" air bleed (whatever that is), then forget everything I said and don't read on. I know the rule was made/adjusted for a completely different scenario, but may have an unintended consequence. What's throwing me off is bolded "A ram air intake shall be defined as one that sources its air from a location on the exterior of the car or the radiator ducting and is ducted and sealed from that source to the throttle body/carb.

The TPI from the factory is not ram air. I know I know, I'm probably the only one in the country running an LT1 thru a TPI intake (and a T5 to boot).
Throttle body gets airs from TPI intake...



which houses the filters...



which sit ontop of a box that gets air from infront of the radiator.
(top view)

(bottom view)


In factory form, there's all the normal gaps on the sides and bottom of the radiator. In accordance with 6.52, 6.54 & 6.25.3, boxing in the radiator is legal. After fighting overheating problems my first season, I converted to a front breather and did away with the air deflector all together.



The top, sides, and bottom I would consider ductwork for the radiator.
All air that goes thru the grille opening goes thru the radiator or air filter.

FWIW, I actually have a TPI box with the bottom cut out. Dyno'd it and was too high tq, and swapped in one that wasn't cut (and still had the rain deflectors too). Didn't make a lick of difference to the HP/TQ numbers with the bigass industrial fan they had blowing on the front of the car.

[BryanL]

Gary whats your interpretation of the difference in a cold air vs ram air system? Nice aero belly skin, too!

Thanks Michael-campfires in Houston are the best part of going down there. I'll make a topic wheel to spin and have rearends, weight, torque arms, and drink for every f bomb from a particular racer.

[Supercharged111]

First off, I haven't stayed in a Holiday Inn recently, so I may be reading the rule wrong. If the radiator itself counts as a 5" air bleed (whatever that is), then forget everything I said and don't read on. I know the rule was made/adjusted for a completely different scenario, but may have an unintended consequence. What's throwing me off is bolded "A ram air intake shall be defined as one that sources its air from a location on the exterior of the car or the radiator ducting and is ducted and sealed from that source to the throttle body/carb.

The TPI from the factory is not ram air. I know I know, I'm probably the only one in the country running an LT1 thru a TPI intake (and a T5 to boot).
Throttle body gets airs from TPI intake...

In my mind, the rule was written (WRT drawing air from a sealed radiator shroud) to prevent a guy from hacking out the bottom of his LS1 airbox and then sealing off the front factory inlet. My Z06 draws its air from a sealed housing plopped on top of the radiator shroud. It's a bottom breather like a 4th gen. The Hurricane that I run and the Vararam that's still available don't do much on the dyno if anything in terms of hp gains, but they consistently shave ~.3 seconds off of the 1/4 mile. So no, the radiator itself does not count as a 5 sq in bleed. I can certainly see your concern here, but it goes to show that the rule needed to be better written so it's simpler to understand the concept and enforce.

Gary whats your interpretation of the difference in a cold air vs ram air system? Nice aero belly skin, too!

Thanks Michael-campfires in Houston are the best part of going down there. I'll make a topic wheel to spin and have rearends, weight, torque arms, and drink for every f bomb from a particular racer.

There is no interpretation difference between cold and ram air. If you draw air from the front of the car or radiator shroud have a 5 sq in bleed, you're not ram air and if you don't, you are.

[michaelmosty]

Gary whats your interpretation of the difference in a cold air vs ram air system? Nice aero belly skin, too!

Thanks Michael-campfires in Houston are the best part of going down there. I'll make a topic wheel to spin and have rearends, weight, torque arms, and drink for every f bomb from a particular racer.

I like it!!!

[AllZWay]

Gary whats your interpretation of the difference in a cold air vs ram air system? Nice aero belly skin, too!

Thanks Michael-campfires in Houston are the best part of going down there. I'll make a topic wheel to spin and have rearends, weight, torque arms, and drink for every f bomb from a particular racer.

That is funny.