yelo04goat

iTrader: (11)

looked up the local radial class rules... twin turbo limits are twin 80mm

talking with a few guys at work we was wondering what was the smallest motor or "best" size motor for twin 80mm turbos.

say somethig like the gt47-80 i was what came to mind for me... and i was thinking the motor would have to be huge... another guy thinking that something int the low400 range could do it... maybe even 390+ cubes

solid roller motor of course purpose build for the 275 radial class with high 7 ETs to low 8s maybe...


i know people like fireball mad it happen with the 98 and only 366 cubes...

turbo370supra

I think john sears rules are no twins. But twin 80s are prob good for mid 7s

Phil99vette

iTrader: (11)

****, twin 80s and a 427" will go 7.2-7.3s. Johns class isn't no where near that fast. Is your local class 1/8 mile or 1/4?

yelo04goat

iTrader: (11)

yea its as per the WCHRA that runs at at Famoso in Bakersfield, Ca they mostly run 1/8

1/8 record 4.988
1/4 record 7.824

from westcoasthodrod.com

DRAG RADIAL(X-275)
(Tentative 2011 Rules)


Entry Fee................... $
WINNER.................... $
R/U .................... $
SEMI .................... $

CLASS DESCRIPTION:

Drag Radial/X-275 is a heads-up class for any and all types of vehicles. This class is
designed around a small Drag Radial Tire (275x60x15) or 28x10.5 Slick(Non W)
Frame rails both front and rear must retain stock configuration.ladder bars are allowed,any single power adder is allowed, including the use of a nitrous oxide, centrifugal or roots superchargers and turbocharged combo's.
Nitrous and Boost Controllers are permitted!**Rear Wheel Drive Only**
***Drag Radial/X-275 will be run in the 1/8th Mile***

CLASS GUIDELINES:

BALLAST:
Permanently attached ballast may be added in a NHRA legal manner. Removable
ballast for the purpose of classification adjustments is limited to 100 lbs. in an
NHRA weight box.

BODY:
The car must retain its original appearance and profiles. Aftermarket fiberglass
replacement panels are limited to; hood, hood scoop, fenders,doors, deck lids and
bumpers.One piece front-ends are allowed (Hood must be separate) and must
retain factory grill,head lights, and marker lights.Aftermarket wings and spoilers
are permitted,but may not extend more than 10 inches from the transition point
with the body to the tip.The driver and passenger doors must open from inside and outside.Lexan Windows are Permitted but must be Stock Appearing !
Maximum allowed Front overhang is 45" Max measured from Front axle centerline
to forward most part of vehicle.



FIREWALL:
Must retain factory unaltered firewall, in factory location.
A cosmetic overlay is permitted.

INTERIOR:
Door panels, headliner(Prefered), carpet, dashboard are required. Back seat
may be deleted, but must have carpet covering the bare floor.

SEAT LOCATION:
Two front bucket seats, or one bench seat with upholstery required. Seats must
remain in the stock location.

BRACKET RACING AIDS:
The use of "Reaction Time Devices" Optical Sensors, Delay Boxes, etc, is prohibited!

BRAKES:
The braking system may be upgraded to discs or larger drums, all cars must have
front and rear brakes.

CHASSIS / SUSPENSION:

FRONT SUSPENSION:
Suspension components must all remain in stock locations. Direct bolt-on A-arms
are permitted. Tubular K-members that are a direct bolt on are permitted. Vehicle
must retain factory shock system (struts are only permitted on cars that came
factory equipped). Sway bars may be removed.Aftermarket Bolt-on Front End kits
that use a strut to replace an a-arm type suspension for early Nova/Chevy II`s /
Mustangs,etc..are permitted (Chris Alston, Smith Racecraft, Fat Man,Heidts,
Scotts Hot Rods, T.C.I., etc..)

K-MEMBER:
Aftermarket factory-replacement-type K-member permitted, but must attach to
the chassis using only the original factory OEM-type mounting bolts. No part of
the K-member may be welded to the chassis.

REAR SUSPENSION:
Bolt on traction devices are permitted. Leaf springs may be relocated for tire
clearance purposes.Mini tubs are permitted, no full size wheel tubs will be allowed.
Ladder Bar type Suspension OK
(Ladder Bar Car Rear frame rails may be notched or sectioned, No Back-Half)

FRAME & CHASSIS:
Stock frame rails must be retained in stock locations front and rear.
Notching of rear frame rails for tire clearance is permitted.
Sub frame connectors are permitted.

DRIVE TRAIN:

AUTOMATIC TRANSMISSIONS:
Any OEM automatic transmission permitted. Aftermarket torque converter,
shift kit, valve body,shifter, and pan cooler are permitted. Trans brakes O.K.

MANUAL TRANSMISSION:
After-market clutch (single disc only) assisted manual transmissions are allowed.
Clutch/Automatics or planetary transmissions are not allowed. Split sliders are
also not allowed.All shifts must be made manually without the aid of electric,
hydraulic or pneumatic devices. Any manual transmission built by an automotive
manufacturer, with stock case and gears will race at same weight as an automatic
transmission entry.

EFI:
Any EFI system is permitted

ENGINE:
Cross-Breeding is O.K.

ENGINE BLOCK:
Aftermarket Cast Iron & Aluminum blocks are allowed.

ENGINE MOUNT LOCATION:
Engine must remain in stock location. Engine may not touch the factory
unaltered firewall. **Motor plates are permitted**

CARBURETOR / THROTTLE BODY:
Any single or dual carburetor or throttle body set-up is allowed

NITROUS OXIDE:
All nitrous systems are allowed. Nitrous oxide commercially available,
thermostatically controlled blanket-type warmer accepted. Any other external
heating of bottles prohibited.The use of any agents other than nitrous oxide as
part of, or mixed with, this pressurized fuel system is prohibited. If an entry is
presented to tech as a non-nitrous weight break, all nitrous oxide lines,fittings,
solenoids, and bottles must be removed before car is allowed to pass tech.

SUPERCHARGER / TURBOCHARGER:
Supercharger limited to 12-71 for Roots**Screw Superchargers are not allowed**
Centrifugal Superchargers F-3R or Equivalent/ Max Turbocharger Twin 80mm or
Single 106mm allowed.Turbochargers are limited to a maximum size of
(80mm or 106mm).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 is prohibited.
***Turbochargers will be measured at the inlet housing.***

EXHAUST:
Production type mufflers or collector mufflers are required. Modification or
removal of muffler internals is prohibited (no gutting).
Side exit "Fender" exhaust OK,exhaust cannot extend more than 3" outside
of the body and must stay clear of staging beams.



FUEL / FUEL SYSTEMS:
Gasoline or Alcohol OK, NO Nitro!

IGNITION:
No restrictions

OILING SYSTEM:
No Restrictions.

ON BOARD DIAGNOSTICS / DATA RECORDERS:
On board diagnostic computers and recorders are permitted.

STEERING:
Rack and Pinion allowed on all vehicles.

STREET LEGAL REQUIREMENTS:
All cars are required to have working headlights and tail lights (headlights doors
must be fixed open or work manually or automatically on cars so equipped).
Brake lights, turn signals are (Prefered).

TIRES:
FRONT TIRES...must have a minimum tread width of 4.5 inches.
Front tires do not have to be DOT approved.
REAR TIRES...maximum 275x60x15 Drag Radial OR 28x10.5 Slick (No W's)

WHEEL BASE:
Must retain stock wheel base with a maximum variation right to left and front
to back of one inch.

WHEELIE BARS:
Wheelie bars are strictly prohibited.

************************************************** ***********

WEIGHT GUIDE:

Base Weight (All weights are race-ready, car with driver)

4 CYL/Rotary W/ Any Power Adder............................................. ...2200 lbs
6 CYL Inline Combos/Boosted/N2o/Innercooled..................................2800 lbs

V-6 W/Nitrous........................................... .............................2500 lbs
V-6 W/Turbo or Blower............................................ ..................2700 lbs
V-6 W/Twin Turbos/SC's.............................................. ..............2800 lbs

Small Blocks W/Nitrous........................................... ...................2900 lbs
Small Blocks W/Turbo or Blower............................................ ........3300 lbs
Small Blocks W/Twin Turbos/SC's.............................................. ....3400 lbs

Big Blocks W/Nitrous........................................... ......................3200 lbs
Big Blocks W/Nitrous (5.0+ BS)............................................... ......3300 lbs
Big Blocks W/Turbo Or Blower( 600 c.i. Max)
LIMITED to CONVENTIONAL HEADS ONLY !!.......................................3500 lbs

WEIGHT ADDS:

SB Ford Edelbrock VictorII ,CFE Pro King or SB Chevy 12*or14*Pro Action
*Does not include OEM Production Cyl. Heads*................................ADD 50 lbs

Small Blocks not using "True Wedge" or any "In-line Valve" Heads/
(Edelbrock/Yates HighPort part #'s 6049SC1 & 6049C3H)
or similar/GM Symmetrical/Splayed
valve............................................. ..................................ADD 100 lbs

Big Blocks using Big Chief, Big Duke, Pontiac, Olds, Ford C & E
Profiler Cylinder Head or any similar Symmetrical/ Non-Conventional
Cylinder Heads............................................. ......................ADD 200 lbs

DEDUCTS:

Any Pre-1978 or Full size(M Bodies,A & G Bodies,T-Bird,LTD,
Cougar,Trucks) W/Factory Style Suspension............................DEDUCT 100 lbs

Normally Asperated/N20 Combos W/Single Carb/TB...................DEDUCT 50 lbs



Normally Aperated/N20 Combos W/ Cast intake........................DEDUCT 50 lbs

Turbo/SC combos running gasoline without an intercooler............DEDUCT 100 lbs

Vehicles using: ProCharger/ ATI D-1,D-1SC,D-1R,F1,F1A,F1C,F1R,F2
Vortech A thru T-trim/Up to YS & YSI & X Trim
PAXTON NOVI-1000,2000 Or Equivalents,
Single 98/twin 72MM..or Smaller Turbos................................DEDUCT 100 lbs

Normally Aspirated Combos(No Power Adder)...........................DEDUCT 400 lbs









.







All drivers and vehicles must meet current NHRA and track requirements.

Phil99vette

iTrader: (11)

Each track is alittle different for the radial cars. Vrettos went 7.3x on twin 80s and a 4xx" small block but that was on the 315s but the 275s can 60' just as well. I'd build a 427 and a billet 106mm.

yelo04goat

iTrader: (11)

buutt... twins look cooler through the bumper.

i was thinking the 106 would be easier to do was just wondering about the twin 80s and what motor it would take...

thanks for all your input and knowledge Phil.. i will use it ALOT!

i want to build a 275 radial car but with my buget by the time it would be done i would have to redo it becuase i wouldnt be able to keep up..

just imagine where cars will be in 7-10 years high 7s wont be ****... should just build a bracket car and go for 9.0-8.5 index or something..

Phil99vette

iTrader: (11)

The west coast series is more of an Extreme 275 than an x275. Best of luck with it.