cagedruss

How much Horse power can one expect from a Street port in a 6 port engine? I want to race a 2nd Gen in RS in SCCA and would be required to run a 6 port. How much can be expected with a Motec or similar fuel injection?

Anybody have any Dyno specs?

Thanks!

neu

would all depend on how much it's ported... no one can give an accurate figure on how much this or that street port can give, everyone does them different, some go a little bigger than others

Alex-7

10-15% max

J-Rat

iTrader: (2)

It would be near impossibe to determine this without specifics on the port.

MPM

What is RS? I've heard of ITS, FP, CSP, SM2 and whatever stock class they race in but never RS.

Your HP/torq numbers will be affected by more than the porting of the engine. You have to consider the intake and exhaust your using. I'd imagine you could have a 30-40HP spread between the wrong and right combination of parts. And depending on what RS is you might not be allowed to change some of those parts.

cagedruss

Here is the rules for RS. It is a Regional class, most have. I should have wrote this different. Here goes. In a perfect world with a maximum Street port, optimum rotors and housings, ceramic seals, and racing exhaust, what could one expect for HP?

I only have experiance with Bridge Port engines, this class outlawed the BP 3 seasons ago. I was told by the author of the rules these engines can be competitive in the series, but there is none running in it.

2005 OREGON REGION SCCA RADIAL SEDAN (RS) RULES
1. PURPOSE:
Radial Sedan is intended to provide a class for cars that exceed the preparation
limits in the applicable Conference Production or SCCA Improved Touring
specifications but still meet all safety regulations of the GCR. It is also intended
as a showcase of current trends in performance. Be sure to read beyond this
paragraph to ensure your complete understanding of the RS rules.
2. ELIGIBILITY:
Radial Sedan cars must be (or have been):
1. Marketed to the public in the USA as a unit.
2. Marketed in sufficient volume so that the vehicle’s specifications are
standard.
3. Able to seat (4) average size adults as sold to the public. Those cars that
are not able to seat (4) average size adults may also compete. But must
carry a weight penalty of 200 lbs over the minimum weights specified in
Section 4. IT cars are an exception to the above per section 5.C.XII of
these rules.
Competitors must provide factory a service manual (or industry substitute) for
their cars.
3. SAFETY REQUIREMENTS:
All Radial Sedan cars must meet the same minimum safety requirements as
Improved Touring cars as provided in the GCR section 17. SCCA GT legal
cages, fuel cells and fire systems are allowed and encouraged.
4. OFFICIAL WEIGHTS:
All cars will be weighed as raced, with driver. The weight for each car shall be:
A. All Piston engine, pushrod, two-valve per cylinder cars will weigh at least
.90 pounds for each cubic centimeter of engine displacement as raced
plus 180 lbs. For example, a 2000 cc two-valve per cylinder pushrod
piston engine powered car must weigh at least 1980 pounds.
B. All piston engines, overhead cam, two-valves per cylinder cars will weigh
at least .95 for each cubic centimeter of engine displacement as raced
plus 180 lbs. For example, a 2000 cc two valve per cylinder piston engine
powered car must weigh at least 2080 pounds.
C. All piston engine cars with multiple valves per cylinder (>2) will weigh at
least 1.0 pounds for each cubic centimeter of engine displacement as
2
raced plus 180 lbs. For example, a 2000 cc four valve per cylinder piston
engine powered car must weigh at least 2180 pounds.
D. All piston engine cars with multiple valves per cylinder (>2) and variable
valve timing will weigh at least 1.2 pounds for each cubic centimeter of
engine displacement as raced plus 180 lbs. For example, a 2000 cc four
valve per cylinder piston engine powered car must weigh at least 2540
pounds.
E. All rotary engine cars must weigh at least .85 pounds for IT prep. and .95
for EP prep for each cubic centimeter of engine displacement as raced
plus 180 lbs. Rotary engines will be prepared only to IT or EP
specifications. Engine displacement shall be as follows:
IT Legal 12A = 2292 cc’s = 2128
IT legal 13B = 2616 cc’s = 2402
E Production Legal 12A = 2292 cc’s = 2357
E production Legal 13B = 2616 cc’s = 2665
· Street port does not allow water jacket modification.
· Bridge porting: will not be allowed
· Peripheral Porting will not be allowed
F. Ballast may be added to all cars as required to meet minimum weight,
provided it is securely mounted within the bodywork and serves no other
purpose. (Per. GCR 17.9.1 Ballast)
5. MODIFICATIONS:
A – Bodywork: In keeping with the stock nature of this class, all cars shall
maintain their stock appearance & dimensions.
I. Fiberglass or carbon-fiber, hood and trunk panels and bumpers are
permitted, they must retain the stock appearance & approximate
dimensions Pre 1975 cars may use a small fiberglass fender flare for
the purpose of tire clearance only, they must retain the stock
appearance & approximate dimensions (two inch tolerance allowed
at any point)
II. Front air dams are permitted provided they do not protrude more than
1.5 inches from the outline when viewed from above, not including
bumper or bumper mounts. Also, no part of the car except the
3
exhaust and suspension may be lower than the lowest part of the
wheel rim.
III. Bumpers may be removed.
IV. Interiors may be “gutted” including removal of the passenger seat,
removing door windows and window mechanisms.
V. All windows may be replaced with any material specified as
acceptable in the SCCA GT regulations.
VI. Batteries may be relocated, but must be securely mounted in a
containment box to protect the driver if the battery is in the driver’s
compartment. Racing (gel) batteries are permitted.
VII. A touring type wing maybe be added as long as it’s located
within the width of the rear fenders and is no higher than 6
inches below the roof line. On wagon back vehicles a touring wing no higher than 3 inches from the roof may be used. No other aero devices shall be used.
B – Chassis, Tires, Brakes, Wheels
I. An IT or GT legal roll cage must be installed. Standard suspension
pick up points must be used. However, the original unibody and/or
chassis around suspension pick up points may be reinforced, and
camber/caster adjustment may be added. Suspension bushing
material is free.
II. Springs, shocks and sway bars are free. All other suspension
components must be standard, however, they may be reinforced.
III. Any DOT- or MOT-approved tires may be used (as per IT, racing
tires, recapped, or regrooved tires are prohibited).
IV. Any production car brake system components (calipers, master
cylinders, brake rotors, etc.), which can be bolted on without
modification, may be used. In addition, dual master cylinder systems
and brake biasing devices may be added. Any brake lining material
may be used. Water-cooled or fan cooled brakes are not permitted.
Racing calipers and rotor/hat assemblies may also be used, However
those cars racing with any non-production car brake system
components must increase the minimum weight from Section 4 by
100 pounds.
V. Any road/racing wheels may be used (as per IT, tire tread may not protrude beyond fender opening when viewed from the top perpendicular to the ground). Wheel and tire combination must fit under stock unmodified fender except as outlined by these rules for pre-1975 vehicles.
A tolerance of 2 inches from specified standard track is permitted front and rear.
C – Engine and Drive train
I. The engine and drive train must have been available with the body
style as raced. It is permitted to machine the components of the
4
engine, however, no material or mechanical extension may be added
to any part. Forced induction is not allowed.
II. All cars may use up to (3) automotive carburetors and associated
manifolds that can be purchased over the counter as a bolt on
modification. Original carburetors or fuel injection systems and
manifolds can be modified, however, no material may be added to a
stock manifold, carburetor body or fuel injection throttle body.
III. The exhaust system is free, but must include a muffler, and must end
aft of the driver and within 3 inches of the outside perimeter of the
bodywork as viewed from above. Sound pressure limits are defined
in the Supplemental Regulations for each event.
IV. Ignition systems are free.
V. Oil sump and oil pickup may be modified to increase oil capacity and
to prevent surge. Oil pump may be substituted or modified, An oil
cooler may be added provided it is contained within the body work
and not visible from outside the car. Breathers, air filters, and oil filters
are free. All emission control devices may be removed. Catch tanks
must be utilized for the oil breather.
VI. Any radiator, which will fit in the standard location and not altar the
appearance of the car, may be used. Fans and/or fan blades can be
modified or removed.
VII. Fuel pumps and fuel filters are free, but they must be separated from
the driver/passenger compartment by a metal bulkhead.
VIII. Gear ratios are free provided the transmission and differential
housings are retained and not modified. Differentials may be modified
to produce a locking or limited slip action.
IX. Heater may be removed.
X. Clutch and flywheel are free.
XI. Any engine modification that is legal according to the Improved
Touring, Conference Production, or SCCA Production class rules is
also legal in RS.

Here is the rules, as you can see, it is a catch all like ITE.

von

Its not impossible to tell. I mean just add the standard 10-25% how hard is that?

It's not uncomon for poeple to make 220rwp? with a big streetport, ecu and alot of tunning.

Icemark

That pretty much rules out the FC, as it could never fit 4 average size adults in the car.

drft_180sx

^ exactly what i thought. But wasn't the 2+2 FC's marketed to fit 4 adults? although we all know only legless dwarfs can be squeezed back their...

cagedruss

That would be the thought most of us come to when reading the rules, however the legless adults that can fit in the back is good enough for the rules committee. My daughter is 10, she could not really sit in the back of my 2+2 for more than 1 hour before she complained and that was with the Pass seat all the way forward.

The region believes you can get upward of 260hp with a tuned street port with a Motec. I have not seen any number substantiating that and I do not believe. That is why I am trying to see what the general consensus is.

There isn't ant FC's running this class anymore, only Nissan 240sx's, Acuras', and Golf's.

I know the Nissan is running close to 280-300 hp, it is a well developed car and is fast.

SDrotary-FC

we are getting 300+ on the engine dyno on a 13b 6 port for E production class