I've recently done an engine swap on the RX7. and I'm curious how much horsepower I'd have. I have a 12a with a decent streetport, RB streetport exhaust, and a Yaw Carb/manifold. I should have about 160-170, right?

 

um... fat chance. Try about 140 best.

I am a horse power pessimist though.


EDIT: a good way to find out is to dyno it.

 

Stock 12a's have ~100bhp, I doubt you gained 60% more HP from a carb and port job.

I would say realistically, 120-130

 

What is your definition of a decent streetport? With just the carb and exhaust it might be making about 130-140hp at the flywheel. Power gain from the streetport has a lot of factors involved. Best guess is possibly 150hp at the flywheel.

 

Paul Yaw quoted a stockport 12A with bolt on upgrades (exhaust,igntion and Yaw Carb/mani) at 150hp at the flywheel. I ran that setup and it felt evey bit what was quoted.My stockport 13B with the exact same setup ran a dead heat drag race with my buddies GSR powered Civic which was the same weight and about 180hp.
Add a streetport to the 12A and the numbers were supposed to climb up to 175. Mind you,thats PEAK hp and thats not measured at the wheels, like most people prefer to do.
It sounds ridiculous since most engines these days dont respond like that,but its probably accurate considering the 12A was pretty strangled down having been sold during the dark years of smog control devices.

 

My car has a stock port with the mods in my signature and dynoed at 134 whp. Figure the loss
percenttage at 12% and your at around 150 bhp or so. Add in a SP and I would say add maybe
15 or 20 to that so, 165 to 170 would be pretty close.

 

i agree, a stock engine will do about 150 at the flywheel with the carb and header, add the port and you could be around 170, but that's flywheel.

 

RB Header, 2.5" Stainless mandrel exhaust, cleaned up SA manifold, Stockport 12A from Pineapple racing with 40,000miles, nikki on top made 110RWHP from a very respected dyno shop in the Portland, OR area.

 

damn it was a couple years ago, but i hit 114whp 109 tq on the stock 12a that came in my car with 160k miles on a long primary exhaust and stock nikki with all emissions removed and mechanical secondaries.
also rebuilt the engine with a monster streeport and a holley and power difference was insane so i think 170hp is possible but it will take some work

 

I have yet to drive the car; It's ready to go tomorrow when I get off work. I'm going to do some driving on highway 9, I'll let you guys know how it feels.

 

on 9 it'll be awesome!

 

No doubt, I'm about 5 minutes off 9 and drive it all the time. That or Bear Creek to get over to 17 is a great drive.

 

With the rebuild and straight through setup you might be seeing amazing performance gains....compared to the lack of power you probably were experiencing due to compression issues & obstruction from build up.

I wish I had the time right now just to continue stripping everything down and send stuff off for a rebuild. Congrats on having a good foundation to build on boss.

 

Thanks guys, it feels great, has a lot of power, and corners great with the suspension. Couldn't be happier and oh man is it better than stock. I've lucked out with finding parts for the 7.

 

I have a 79' rx7 4sp manual. Has a monster streetport, carb intake kit for a weber 48ida, rb headers, custom dual exhaust piping to a rb muffler and a gsl rear end. Im not looking at 200hp at the fly?

 

sound like a realist to me.

170? yeah...

and why is everyone now referring to crank horsepower? i thought that was a honda thing.

 

Sorry, my goal is to hit at least 180 at the wheels.

 

Not with a 12a unless you go bridge and even then I think it will be close.

Let us know how it turns out for you.

 

Car feels a lot faster but 140 is much more like it now that ive driven it. When I first posted this thread I hadn't driven the car yet.

 

I guess the only way to find out is dyno it. For being 140 it feels a heck of alot faster than that. Im going to research this because people say to hit 200hp, at the fly, is possible with out forced induction or nos.

 

Not with a stock port 12A. I'd check your sources, they sound like they don't know
what they're talking about.

 

One of the comenters (sp?) on this video hit 370hp N/A on his 12A!!!

 

sure he did.

all those ebay bolt ons added up to that of course.

 

With your listed mods 140rwhp sounds about right, I have a 12a large streetport on a RB Holley, manifold, and header, on a custom 2.5" exhaust that was dynoed at 141rwhp. so that said, 140 is in the ballpark.

 

Thanks for helping me understand all this and to be realistic. Dont wana go fi until later on. How about those camden superchargers?