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Date Posted: 11:22:39 11/15/04 Mon
Author: Jake
Subject: Turbo Rules (READ)

Below is the NMRA Drag Radial Class Weight breaks and turbo rules. The limit turbo’s to no bigger than 82mm and only 360 cubic-inches. This call only allows Conventional non canted valve heads. A Car has already been 170 MPH on Drag Radials in this class with the 82 MM turbo.


1.23 TURBOCHARGERS
Only one turbocharger permitted.
SINGLE TURBOCHARGER: Accepted single turbochargers are permitted with the following requirements: Turbocharger must be of conventional impeller and housing design and type. Turbocharger is limited to a choice of two turbochargers (at two weight breaks): [a] maximum size of 80.0 mm/3.150" - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.230" where the leading edge of the compressor wheel meets the housing. [b] maximum size of 82.0 mm/3.228" - inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. Inlet housing is permitted a maximum inlet diameter of 3.308"where the leading edge of the compressor wheel meets the housing. Compressor wheel to housing clearance must maintain a maximum of 0.080" clearance beginning from a) where the leading edge of the compressor wheel meets the inlet of the compressor housing to b) the transition point where the trailing edge of the compressor wheel meets the volute. All air entering the turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the inlet or exhaust housing prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels prohibited. Impeller wheel may not be stepped, cut down, or notched to meet impeller tip-to-tip dimension.

1.24 AFTERCOOLER/INTERCOOLER
AFTERCOOLER/INTERCOOLER: One and only one aftercooler/intercooler permitted only on forced induction entries. Air-to-air or air-to-water/ice are the only systems permitted. Water and/or ice are the only components permitted in the reservoir.

13: WEIGHT BREAKS/ENGINE COMBINATIONS

DRAG RADIAL
Base weight:
POWER ADDER BASE CI WEIGHT
Turbocharged – 82mm 360 3300
Supercharged (ALL MODELS except X Trim) 360 3100
Supercharged (X-TRIM) 360 3300
Nitrous Oxide 360 2950
Nitrous Oxide 415 3150

Forced Induction entries without intercooler may deduct 200 lbs from vehicle weight.

1.17a) HEADS, PERMITTED: Original manufacture, generally available heads, accepted by NMRA, permitted. External modifications prohibited in port area. Spark plug placement and depth must remain stock. Billet or fabricated heads prohibited. One-off or custom made cylinder heads prohibited. Internal port areas of cylinder heads may be welded or epoxied, but heads must maintain standard "as produced" valve layout design, valve cant, etc. (no fabricating a canted valve design from an inline head, etc.)

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