i have never heard the HP estimets of a 13b with a big Steert port and an electric fan....?

 

6 or 4 port? Intake? Exhaust?

 

I don't have any horsepower figures but I have a rx-7 video where Amasan from RE-Amemiya built a SA22C with a street ported 13b with weber downdraft. And they said it was faster than a stock FD on the track(Tsukuba Circuit). Didn't mention any numbers though.

 

well a fully race prepped tuned within an inch of it's life and 103 decibel 12a streetport with weber ida as used in scca e production puts max 225 @ the flywheel. keep in mind this motor is too loud for street so subtract for mufflers. if 13b's put out say 10% more power then 247.5 witha 4port

i personally saw a 13b 6 port streetport with weber dcoe and U intake manifold put 186 to the ground. another e prod car with no mufflers. ~223 at the fly 20% drivetrain loss.

all of these motors have the biggest streetport u can get and electric fan.

Enjoy!

 

damn, so I'm correct in saying that you can get 200 plus to the wheels with a bridgeport(not cutting all the way to wear you have to modify the waterjacket)

 

My 12a J bridge cut thru the water seal and that water passage filled with silicone put 205 to the wheels with 30* timing. thats ~ 245 @ the fly. dellorto 48 dhla 42mm chokes. FULL RACE EXHAUST. Too loud for street.

Common to get a 13b J-bridge cut water seal to put 285 to the fly with 44mm chokes.

If it's not a J bridge and water seal not cut of course figure less pow-ah.

 

wow i guess i need a turbo for my 12a then i was hopping to get about 220 out of a 13b carbed with exauhst for the street but that sounds like it would be impossible ( i dont want bridge port)

im looking for a relible way to turbo my car now i dont want to much hP or at least a boost controller

 

Streetport, carb and exh around 190hp sounds right. This is a pretty fast and reliable set up. Turbo is the only way to go for more HP and steetable, but more maintenance.

 

A bit confused over the thread, starts with a question on 13B streetport but turns into a 12A

Stating with a 13B large streetport, 48IDA carb and street legal exhaust system, you would be looking at around 210-220hp at the flywheel, about 175rwhp.

With a Streetport 12A and a Sterling/ Carl modified Nikki carb and street exhaust, around 175-190hp at the flywheel and 150rwhp.

Going large streetport or bridgeport runs into the problems of legality, for example put a street exhaust on a J port and it chokes it to death with less hp than a well tuned streetport!

For 200 hp at the wheels and streetable, turbo is the only practical way to go. If boist is kept to under 8 engine wear and fuel consumption will be reasonable, say 15% engine life, and 25% fuel consumption less than stock.

An electric fan omly saves 1-2 hp, perhaps less at high speed. The difference is so small it would be difficult to measure on the dyno with certainty.

The figures you get in practice will vary by 10% depending on the dyno and conditions.

 

Streetport 13B 4-port with race exhaust and webers/SU's made 190-200 rwhp. This was several years ago and at the time there were other RX-7s that were faster, (unfortunately). I don't remember what it was with "street" exhaust. The RB exhaust is pretty good though. Maybe with modern EMS and FI there could be a little more gain.

 

who needs exhaust. Just run the pipes all the way back straight with no mufflers. Of course you'd have to worry about cops but I don't see people on Harleys pulled over(love those). I'm gonna try that when I get bored on my stock motor.

 

the reason i ask about a 13b is because i dont really want to go turbo but i want something that will go fast but not rev to 10 grand

the electric fan doesnt add much HP but it makes less for the engine to turn
i guess this is my plan to get done b4 next winter

Rebuilding engine
Electric fan
i think i will just Sp my 12a
thinking of a holly so i have a little low end left
i already have header into racing beat muffler not cats at all
LIght weight flywheel
and a streetable clutch


what do u predict my 0-60 would be
7 seconds?

 

I have a question about an engine setup I shall soon have.
Rebuild and Streetported 13b 6 port with S5 rotors (Higher Compression Ratio)
Estimated 155 Flywheel Hp
RB Streetport System 170
E fan, No AC, Airpump 5&6 mod 175
S4 Intake Mani, TB mod ect. 185
Light Flywheel, RB Clutch Ect. ---

So I think I am looking at around 185+/- Flywheel Hp in my SE which should put me somewhere in the 14's with 6-7 0-60 times correct
Any comments corrections suggestions ect are welcome.

 

Oh
Also is there anything else besides what I listed above that I can do to up the performance besides, turbo, supercharge, or carbing it? (daily driver)

 

Has anyone run a 650cfm 4 barrel Holley Carb (RB kit) on a street ported 13B 6-port? 4-port? Whats the HP gain aprox going with a 4-port over a 6-port?