I have a 1984 rx7 gs and i want more power i was talking to one of my friends and he suggested porting. so i started to look it, but i would like to see what people who know what they are talking about to help me out. I think if I port the 12a it would be less money, than an swap. please help me

 

What are your hp goals? Turbo or NA? Carb or FI/? How much money are you willing to spend? How much mechanical skill do you have, along with the appropriate tools?

Porting a 12a will require a rebuild, with a gasket set at a minumum, full rebuild kit recommended. Depending on the condition of the engine, you may need housings, irons, rotors, bearings, etc.

Decide these things and ask again.

 

^^^^what he said^^^^

i <3 my 12a if your going to swap to a 13b make sure its the TII motor........what is done to your motor right now? any thing stock? if your motor still runs you could do a turbo set up woot get 200+ hp and all the tickets you can get and cheeper than a motor swap and alot less work........not tuneing lol

 

right now i have about 18k miles on the 12a. i dont want to spend over about $1500-2000. its a stock 12a nothing fancey but i do have racing beat headers Im going to put on. I would like to have a turbo or supercharger. i also want to put coilover suspension on it to.

 

what hp numbers are you wanting? you can do a turbo set up on your 12a with stock port and make good hp............you can use your stock carby get it set up for blow thru buy/make a turbo manifold get a s4 turbo fmic piping and there you go in the 200 hp range witch is fast i know a few ppl running that set up..................im not for sure but i beleave its more like 250hp but dont any1 go flaming me if im wrong but i THINK thats what it is

 

if you're going turbo those RB headers are going to be very useless afterwards.
turbo is cheaper than supercharger
beyond that... do what you want.

 

^^^^this is very true^^^^

send them back to RB and get there weld together header its 89bucks and build a turbo manifold woooooot........or keep the header get a good flowing exhuast and get a diff intake manifold and carb and make 165ish hp <-----also is very fun lol i love driving a stock 7 to .......err i love all then in all forms

 

A ported 12A and a 13B are two different animals.The WAY an engine makes power is just (if not more) important, than how MUCH power it makes.You have to decide what youd like your car to do for you.Do you want, on demand big power any time you ask for it?,do you want smooth delivery and useful torque?,do you want power than you can wind out and beat on with a big grin on your face?.............


1st choice,port the 12A.Anytime you port,you shift the power to the topend.That means usually,there will be less power in the lower RPMs.The more porting you do,the more the engine will develop a dual personality.If you take a torque deficient engine like the 12A and port it,youll have a more powerful engine that will need to be kept wound up to enjoy.This can be very fun since you still get the joy of really working the car hard and driving to the limits of its ability,without going hundreds of miles per hour and taxing your stock brakes.There is always a penalty though, and that comes in the form of fuel consumption,smog emissions and less torque for tootling around town.

The 2nd choice is a 13B.A bigger engine will have more torque,more grunt to get you around.That means less shifting,less winding the engine out,less neck-snap powerband.Youll be able to pull cleanly from much lower rpms around town and less throttle will be needed to do it.It may not be as exciting as thrashing a ported 12A,but itll put you in the seat better and for longer during the revs.Engine longevity will be increased and the car will handle hills,altitude and loads better.Porting will increase topend power,youll again lose some lowend grunt,but it will be less obvious than with the 12A since you have a larger displacement engine.

The 3rd choice is turbo.Either 12A or 13B if you turbo,you increase torque and HP exponentially.You also increase cost,fuel consumption and complexity greatly.The up side is on demand power any time you want it,and prodigious thrust thatll leave you loving your new power.The down side many people dont take into consideration is loss of that "goofing off" that 1st gen owners often enjoy on a winding road.Beating a slower,underpowered car to its limits is fun and satisfying,and theres less chance of hurting anyone,yourself included.If you goof off in a powerful and, frankly overtaxed car(1st gens arent factory designed for 200+HP) it can be deadly if you dont put everything into concentrating on the road and controlling the car,even if the engine is only lumping along.Your only at your limits when the sh*t gets serious and your over 100MPH.Wind out a couple gears for fun and your instantly at unsafe,illegal speeds.

Let your long term plans decide which way to proceed,all are good choices,but each is a different behaving animal which will change your driving habits and your car's nature.I know because Ive had them all at one point in my 84 during my 10 year build up.

 

i personally have a 12a 1/2 bridged and its a fun ride it wants to rev to 10,000 like nothing but it also wastes gas alot but i also love the bridge port sound out of the racing beat muffler. But if your going turbo i would rebuilt ur 12a and street port it and turbo it. My friend has a 12a tubo with microtech and it really flies it makes the tires **** real bad. Best bet to me would be what budget do u have for the project and from there make a desicion on what u want

 

hay thanks for the help, i would like the top end to have a lot of power but i also want to have a good quick take off too. this next year i was thinking about doing the scca solo events but i have heard so much about how i shouldn't spend my money on my motor i should put it all in to suspension, and sway bars,ect. I do like the 1st gen, but I' m really liking a 3rd gen. I have been looking on ebay and the local auto shopper at the newer 7. I heard from some people that mazda is thinking about a new 7. but i still like the thing of haveing no car paymet, but that might change.

 

People have been saying there is a new rx7 in the works for years - I for one hope it never happens, and each year it doesn't happen. If they do make another rotary powered true sports car then it wouldn't be an rx7 anyway. It would be as bad as them bringing back the rx3, or cosmo. Let the cars die after production, and let us love the past by moving forward. Its horrible in my opinion how they brought back the GTO and the Charger. They ceased to exist many of years ago, they would only be trying to sell the name at that point. If they want to release an rx9 that is based on a true sports car platform, that would be wonderful; but let's let the 7 go down in history as the wonderful sports car it was and not get our hopes up on a name.

Sorry, irritated rant.

 

well, i would have to echo what has been said before. it's all about what your expectations and modes of accomplishment are.

porting your 12A should work out to be cheaper simply because you won't have to spring for a NEW intake system for it. you have little choice with a 13B swap because you either have to buy a manifold and carbie or find a way to wire up stock EFI. time is money, so even if you can do all of that yourself, you're spending a lot ...

13B swap is relatively easy, but if it's stock-ported, then you'll probably end up with a the same power porting a 12A.

 

OK Im glad that some people are helping me out on this