i am new to the rotary but not to the engine. and i love my 7 more than any other car ive driven it is well balanced but it lags in one area that we are all familiar with horsepower. i know i could slap a tubo with some electronics and a few good finds from ebay or a junkyard for a few thousand but by motor wont be good for say another 100k. ive had torbo cars b4 and its awsome nothing like 20 lbs of boost escpecially on a 2200 lbs car!!! but i want to go the n/a route for longevity. who can give me the recipe for dyno proven 200 at the wheels??? im in WA and am considering driving to rotaryshack.

 

Bridgeport, Weber IDA.

downside is you lose any low end torque, and your powerband moves EVEN higher.

They're dont get good mileage, they require very free-flowing exhausts (read: LOUD) and its a costly process in itself.

IMO, you'd be better off going with a blow-thru sterling carb, or a TurboII swap, or bolt on a turbo, and go standalone EFI. You'd have more torque, a better powerband, and with a turbocharged rotary, you can get along just fine without digging into the boost, and go like a bat out of hell when you do hit the boost. With a bridgeport, you have to rev the **** out of them to make them run.

you do get that nice "BRAP BRAP BRAP" idle though

 

is that really the only way out of a 12a is bridgeport??

 

everything i've ever heard, yeah... i think the most you can get out of a HUGE streetport is about 175-180hp...

i could be wrong though.

 

short of turbocharging and a compelte engine swap, you're limited to what you can do. I'm inno way composing a complete list and I'm sure there's a lot more you can do for power that I'm not considering.

-porting which is expensive within itself if you don't want to tear the engine apart
-new carb and intake manifold. Racing beat sells holley and weber kit. You can remove and polish the inside of your intake manifold.
-lightweight flywheel will free up some power
-if you do tear the engine apart to port, go with a 2-piece eccentric shaft.
-exhaust
-K&N filter
-plain old tune up new plugs, wires, cap + rotor
-replace the rear differential gears with numerically higher gears
-remove A/C, and or emmissions

I'm in the same boat as you, love the car but I really wish it had more to offer under my foot. If this was my only vehicle I would replace the 12a with a 13bt with all gadgets but it's not and I have too many mods in my other cars. Hope I may have mentioned something you didn't think of

 

dont drive to rotary shack, atkins rotary is in puyalup, and the do some damn good work, www.atkinsrotary.com
im located in spokane BTW brandon

 

Robert(RotaryShack) should be able to set you up with a decent blowthrough turbo setup for relatively cheap, probably much cheaper than atkins. Give him a call and tell him the basics of what you want and he should be able to give you an estimate of how much it'll cost.

 

 

well, i tell you what. if you want the most out of a 12a N/A. you are lookin at a good bridge port. mybe even the right race port. you'r not gonna get the longitude of the engine no matter what you do. either way, ported, turboed, or supercharged you're gonna loose out in that department. how much? only your driving will tell you. where at in washington you live? pm me and i will tell you the only one i know that could possably give you 200 out of your 12a.

 

IMO a 200 hp turbo motor will probably last a fare amount longer than a 200 hp ported motor b/c n/a tuning requires higher revs(more ware and tear respectivly to a turbo w/ lower revs needed), but either motor would be fun in a 1st gen . if you wanted to make 200 hp for a low initial cost, you could always go for a 100 shot of nitrous, but it may pop sooner or later.

 

where could i find a 2 piece 12a e-shaft? the only people i know that make em aftermarket is guru, but they only make a 13b shaft

 

Want 200hp from NA 12A?
Here's your answer: 100hp NOS kit
Just make sure your fuel delivery is up to par.

Actually one of my 13Bs has a 100hp NOS kit with built internals and it's pushing close to 300hp with a mild street port.

 

100 shot of NOS is alot to me on a 12a. My 50 shot makes the car so much faster, I don't think I need to upgrade the jets, yet.
Basic boltons can do alot, build yourself a 150 hp 12a and enjoy power and longevity and reasonable cost.

 

Man Id love to get a Turbo II motor swapped into my car.



That would be the answer for me. Until then I'll just be happy with the 150 hp (wishful) I plan to get with my delltoro and rb exhaust and header.

 

I love my 12a streetport +S4 turbo-blowing through a 50mm weber sidedraft+intercooled. REALLY quick, but horrible MPG. Fuel costs are a bitch, so I consider it a short range fun car most of the time, and taken to the strip or course racing. I average 12-14mpg driving semi-normally, 7mpg for race course usage. And you don't want to drive it too slow, because of carbon build up is close to as bad as overboosting. But with 7-8psi boost with a intercooler, a 12a streetport is extremely fast and reasonably reliable. I've only changed the transmission once in 1year since I've had this particular setup, and with pre-mix, the engine is well lub'd for the apex seals to last a good long while.

ITs a major trade off. If you plan to actually drive, commute, or just drive it as your daily driver a turbo'd FB with its low gears, you better have good source of income for excessive fuel cost for anything but short drives. I wish I could have a 6spd if one was cheap and bolt up because 4000rpm at 80mph in 5th gear is not good for MPG AT ALL! 220miles on a tank is about as good as it gets on highway, or 150miles with "our" type of driving.

...Or have a second car like I do for my regular driving- a n/a s4 6port '88SE. -Which also isn't a great daily driver for MPG -23mpg highway for me.

Wow, I haven't posted in ages, oh well.

Wacky

 

If it has nitrous it's no longer na now is it.

 

I'm getting about 18 mpg and 250-260 miles in a tank. Guess the FI is a little better for mpg.

Scott

 

mpeterson you have mail.

 

how about peri porting? That should give you plenty of NA power

 

Perpheral porting is not good for anything but track use, and the cost! - Consider this in desending order of importance-Scatter shield, balanced rotating assembly, pinned rotors, race window bearings, clearancing of rotors, high volume oil pump, cost to properly port the housings, correct free flow exhuast to actually get the power from the perpheral ports. There is plenty more to consider. Power is good for the crazy high(and very loud)8000-11000 revs.

Turbo'ing a stock 12a/13b to streetport is cheaper and better for the average Rx-7 driver on the street-wider powerband, quick, smooth idle with standard amounts of porting, reasonable milage when not in boost.

Btw, I probably can get 250miles a tank, but typically you can't restrain from boost even in normal conditions.

 

well thanks guys i didnt expect to get this much feedback. i will eventually talk with atkins most likly as i like in oak harbor and love being the only 7 that represents on all the hondas round here. ill be in need of a motor at the rate i drive within a year id say pbly just go with a mild to moderate sp and a sterling carb for factory appeal. down the road slap a small snail on it with no more than 6-8lbs.

 

4000rpm at 80 mph? I wish i can get that. I have a 79' with the 4sp manual. I go 4000rpm at 60mph. And havent put in the gsl rear end. I have it SP as well, got like 210miles in 1 tank. Lol

 

Wow this is an old thead lol. I vaguely remember reading it 8 years ago shortly after getting my first 7.

 

I hear ya. Its an old thread but they can still be beneficial.

 

alot of old *** thread revivals lately... maybe the thread zombie apocalypse is coming... but seriously noone ever thought to fuel inject this guys car? an extended port or a big street with fuel injection will break 200, and that not news. even in 2004. throw an exhaust on it and done. local guy in our club had his blue printed with a weber and exhaust hit 185. add in FI and your well over 200. everyone assume go turbo...