dean23

a lot of peopel will say that a 12a can really hold its weight in performance, but i want to know how much u could get out of a sp. theres been threads stating around 200+ and others around 150. i want an agreed hp range. lets say wait judge ito's SP and the best of every other supporting item (like carb, FP, FPR, trans, etc)

trochoid

iTrader: (6)

No one has dynoed Ito's sp on a 12A that I know of. Other sp porting templates have dynoed 140-150 rwhp. Since fwhp is listed as 101 factory, that's more than a 50% increase when taking drivetrain losses into account, indicating somewhere in the neighborhood of 165-175 fwhp.

200 hp, NA is bp/jp territory,

dean23

im really debating on a 13b swap or a rebuild\SP on my engine right now. im not really sure wats going to be cheaper either. i kinda seems like its going to cost the same. but id have for hp and torque out of hte 13b, but it would take longer swap in. it would be easier to rebuld and port my 12a, but its still going to be costly with the carb upgrade. its an endless cirle for me.

Weed Wacker

I dont have ito's streetports, i still use a nikki carb, and everything on my car is homemade, i make about 160 rwhp.

My dyno sheet is here
https://www.rx7club.com/1st-generation-specific-1979-1985-18/dynoed-my-car-today-586486/

dean23

those are some nice numbers. but the more and more i look at dyno sheets and driveablilty i want to lean to a 4port 13b. how much did it cost u to get the setup your using?

85rotarypower

Thats a pretty low torque number you have there Weed Wacker. But nice power.

If your going for drivability, the 12A will do the job, but a S5 13B converted to carb will net you probably the same gains, if not more, for the same price, and it will be completely driver friendly.

dean23

an s5 is alsso going to be harder for me to get. its basicly falling between availabitly for me. i would love a 4 port s5, and the idea of efi is nice, but theres too much electrical issues for me to want to deal with. carb would be awesome, but if i ever put a turbo setup on, ill wish i had the efi. i guess i just need to stop putting in all these ifs and just do somethin. haha

Naegleria_Fowleri

I am a firm believer in working with what you have.

And with you living in northern Indiana, if you want someone else to do your port work, you may want to see if you can get ahold of Chuck in Fort Wayne.

Weed Wacker

It cost me about 2500 dollars or so including all materials for the exhaust, buying the muffler, clutch, air filter, jets, all the parts to rebuild the motor the right way, etc. But i did all the work myself, so i might not be a good example , lol sorry.

But the car is very driveable still, which is why i didn't go bigger with the porting, just enough to make me smile while still being able to still be easy to drive, and able to run in the cold winters of chicagoland (when the weather isn't being retarded)!

dean23

how exactly do i find chuck in ft.wayne??

craigw1

go for the 13b swap....its not that bad

i have s5 13b sp, rb street system, 48 ida. 125kw on the wheels. torque of 166nm
unfortunately i have the turbo rotors which are the low compression ones @ 9.0

Naegleria_Fowleri

There is a member here on rx7club, his user name is Derek King. Last I knew, they were room mates. You may send him a pm asking if Chuck will still do port work.

If you want to find his name easily, go to the midwest section and look in the Fort Wayne social gathering thread on the last few pages.

Rotor13B

At least you can go turbo fairly easy. Doesn't sound bad to me.