2020 Rule package 1/6/2020

Body and Glass
Must have working lights, stock appearing interior, carpet, door panels, factory style dash, stock floor pans, and stock firewall.
No body components, bumper add-ons, etc. permitted with the intent of increasing the distance of the front bumper for the purposes of breaking the infrared beams (i.e. no “extenders”)

Must be mass produced. No test or one-off tires
26x8.5x15 M/T 3052 bias ply slick
235x60x15 M/T 3450 ET Street S/S
26x8.5x15 M/T 3352R/3052R Pro Bracket/Pro Radial

No wheelie bars.

All vehicles must retain the complete factory frame rails. Notching for rear tire clearance is permitted.

Stock suspension or ladders bars only

Coil-overs ok

Power Adders
Single type power adder only. All combos

Mufflers required on all entries except turbo cars. Bull horns prohibited

Any ignition or EFI permitted.
No traction control devices of ANY kind.
No progressive nitrous controllers allowed.
No boost controllers allowed. Solenoids must be removed from car
No Digi-sets

Engine Size
SB Power Adder Limited to 440 cubic inch (NA permitted up to 470 cubic inch at 1.5 lbs. added over 440)
BB NA Limited to 620 cu in (over 572 add +3 lbs. per cubic inch up to 600 add 3.5 601-620)
BB NOS to 588 (over 572 add +3 lbs. Per cubic inch up to 588.)
Gasoline or E85 are the only fuels permitted. Methanol only allowed in a 50/50 mix with water and is considered an intercooler.
Cylinder heads
Big block OE passenger car block or aftermarket block 600 cu in Maximum
Nitrous Big blocks limited to stock valve angle/stock port layout/no raised runner.
NA Permitted Big Chief/Big Duke style and Ford C head.
Call or PM for approved heads.
Cylinder heads for SB limited to, 23 degree Chevrolet, 15 degree LS, 18 degree Mopar, 20 degree Ford, OEM Ford casting 4v Modular, any 2v Modular, Trick Flow Twisted Wedge and LS 13.5 OK
All cylinder heads must maintain the automobile OEM intake manifold bolt pattern.

Intake Manifold
Sheet metal or tunnel ram intakes manifolds not permitted on Nitrous Combos. Cast BTR/Holley permitted on LS / SBF.
Single carb or throttle body. NA combo permitted cast tunnel ram base with cast single carb 4150 or 4500 opening

Naturally Aspirated
SB naturally aspirated – 2700
BB NA 3000 (+100 lbs. for big chief style head)
4cyl VW 1600

No multiple stages permitted.*
No progressive controllers or Digi sets
No banking of fogger nitrous system
No Pusher systems of any kind (No NANO or similar), No nitrous chillers (NO COLD)
Cross bar style plates limited to single nitrous solenoid
All nitrous solenoid grounds must be grounded in engine compartment, visible, and easily traceable to the power source. (In plain sight)
No "leaking" nitrous in any way in any location.
Must have perfectly round jet orifice. No modified jets
Purge plume must be entirely outside of the engine bay and
directed upward.

Big Block Nitrous entries maximum jetting
1 jet .082
2 jets .057
8 jets .028

Small Block Nitrous entries maximum jetting
1 jet .092
2 jets .065
8 jets .032

Small Block Nitrous entries maximum jetting
(8.2 Deck/2V mod motor ONLY!!!)
1 jet .098
2 jet .073
8 jet .036

SB nitrous - 8.2 deck or modular 3025
SB nitrous - 3075 cylinder head add see bottom for additional weights
BB nitrous 3275

Forced Induction

Max cast turbo size 76mm measured tip to tip. Compressor inducer will not exceed 76 mm Compressor Exducer will not exceed 102 mm Turbine will be 96 mm X 88 mm. The Borg Warner S400SX4 S475 1.32 a/r with T6 flange fits into this category. (No reducers allowed to achieve this size and no clipped wheels)
V6 and 4cyl permitted billet wheel. (see additional notes below)
You may be required at any time to remove your turbo and/or your turbo cover to be checked.

Maximum supercharger sizes D1, V-7/V30 JTB Trim, NOVI 2000, Kenny Bell 3.6, YSic, D1x
6-71 blowers (street style – B&M type/TBS) Sb w/ single carb on gas only.

No gear drives – belt driven only (JTB permitted larger gear box)
Air to water, Air to air intercooler OR water meth injection allowed. Can only run 1 style intercooler
A single line from the manifold to the wastegate only
Nothing else to top of wastegate or blow off valve
SB cast turbo - 3200
6 Cyl turbo – 3175
6 Cyl any listed supercharged/Blower – 3000
SB D1, NOVI 2000, Kenny Bell 3.6 – 3100
SB 6-71 3100
SB V7/V30 JTB Trim 3100
SB D1x 3225
SB YSI billet – 3250 (deduct 50 for cast YSi)
4cyl turbo manual trans 2025
4cyl turbo auto trans 2225
Inline 6 turbo manual trans 2900
Inline 6 turbo auto trans 3100
Twin 71 mm turbo full size car with bench seat 4000 lbs.

No AWD vehicles
Weight Penalties and Deductions
Deduct 50lbs for 235 S/S radial (any combo can take weight break)
Deduct 50lbs for SBC and SBF Stock block.
Deduct 50lbs.for Mod and LS Stock iron block.
Deduct 50 lbs. Stock 7.4L/9.8 deck and smaller factory block
Deduct 50lbs for 6AL or equivalent box with no add on.
Deduct 50lbs. for non-intercooled boosted/blown combos only
Add 50lbs for BBF A head
Add 50lbs for All* SB High port, Ford TFS-R, TFS High port
Add 50lbs. for class spec 76/105 billet 96/88 Turbine NEW
Add 50lbs. for W5 mopar head on Nitrous SB
Add 75 lbs. for All SB Nitrous 20 degree high port SR20 –FT1 or T1RI or equivalent, 15* SBF and SBC Nitrous 18* and 23* raised runner heads. No turbo/ supercharger combos with these heads.
With all the new heads that are coming out, we will look at them and adjust periodically.

NA permitted cast non-inline cylinder head, must get prior approval from tech.

Ultra Cast Turbo 76 x 116 - 96 x 88 add 200

Engine diapers are mandatory.

ANYONE caught cheating will be banned from all Limited235 events
X275 Motorsports Series reserves the right: If one combo has a significant advantage, we will look at the rules and adjust them accordingly.