So I just bought a 93 rx7....

[expl0d]

First of all introducing myself, My name is Jay live in broadview hts., Ohio. Former owner of a 97 civic project and turned out nice but I bought a car with some balls finally.
I usually try to make superfly sundays (pending work) and the local brunswick carshows every saturday.


got sick of my 97 civic so.....
bought a 93 twin turbo rx7 with 54k miles black exterior, camel interior. Has a bov and a greddy turbo timer already. everything else is bone stock. This is a stored car only driven in the summer exterior is spotless. Never owned a turbod vehichle nor have any expeirence with them (my family is a family of body shop owners)

Im only 16 but I work at my dads garage and have been learning a lot. I put about 6grand into my civ turned out nice for a first project won some locla awards for exterior styling.

Im in it for the performance now. (ever since my civic got beaten by an intrigue). I have the bov.. what should be my next move? No expierence with rotary engines. Should i rebuild the engine? Should i get a good exhuast ( btw, was at greddy's site $680 for a rx7 exhuast), what! :confused:

RX7 Newbie,
Jay

BTW, ill have pics of my car posted monday.

[Kenetix]

If you want to go fast the first thing you need to do for the FD3S (or 3rd gen) is replace the radiator. It is NOTORIOUS for over heating, once any appreciable mods have been done. And unless the car has been beat don't worry about rebuilding an engine, which unless you're an experienced rotary mechanic, you'll either have to have a specialty shop or a MAzda dealer do.

[expl0d]

where can i find rx7 goodies at? anone know any links to any websites, ebay didnt have a whole lot for 3rd gen rx7's

[APEXistud]

If you have any questions about FD (3rd Gen RX7), Rishie of AutoR&D can most certainly help you out. Kenetic is absolutley correct when he says replace the radiator. I think I remember Rishie saying something about having a compression test done too. I'm probably wrong since I have no experience with the rotory engine.

[Kenetix]

Alot of good places to start are -

http://www.rx7.com

http://www.mazdatrix.com

http://www.racingbeat.com

The third generation RX-7 can be a very reliable automobile. However, as an ultra-sophisticated, lightly disguised, rotary-powered race car, it demands special care. Before modifying the RX-7, one must become aware of its unique subtleties. One characteristic of the RX-7's unusual powerplant is its absolute intolerance to detonation. Unlike most conventional reciprocating engines which are able to withstand the abuse of knock, rotaries can fail (or at least become seriously compromised) with just a single, serious ping. This is one reason that rotaries are designed to run exceptionally rich air/fuel mixtures compared to their piston-laden counterparts. The RX-7, like most OEM turbocharged cars, is equipped with an electronic knock sensor that keeps a constant vigil for the tell tale signs that usually lead to knock. Although Mazda has taken many precautions to keep the 13B running reliably and trouble-free, the powerplant is anything but foolproof-- especially in the hands of an inexperienced tuners.

The FD (Mazda's designation for third generation RX-7) comes equipped with a MAP (Manifold Absolute Pressure) sensor, not a typical MAF (mass air flow) sensor. This mean that the stock ECU does not readily compensate for increased flow caused by exhaust back-pressure reductions or a intake upgrades. Reading only manifold pressure , the stock ECU relies on fixed maps that no longer deliver the required fuel for the increase in volumetric efficiency. Under this situation, a momentary lean-run condition can easily lead to detonation and apex seal damage.

Another potentially disastrous complication that plagues many over-enthusiastic shade-tree mechanics has to do with the FD's sophisticated sequential twin turbocharger system. Tuned carefully by the bright engineers at Mazda, the twin-turbo system offers nearly seamless power output from idle to redline. Controlled by numerous solenoids, countless vacuum lines and various mechanical actuators, the turbo control system is designed to deliver a consistently safe boost pattern and optimal driveability. However, problems immediately arise when cats get gutted, intercoolers upgraded, and free-flow exhausts installed. Since the boost control system operation relies on manifold pressure and exhaust back-pressure, a dramatic change one or the other can result in a severe over-boost situation. This problem becomes most obvious during the transitions to the secondary turbo when boost pressure can momentarily spike several PSI. This short-term spike can lead to detonation and, almost always, blown motors. Similarly, a denser, cooler intake charge, from the use of more efficient intercooler units, can contribute to lean-run conditions if not met with appropriate EFI system modifications. For this reason, I suggest that even a relatively simple bolt-on upgrade is best accompanied with appropriate boost, timing and fuel re-mapping.

So what about all those RX-7s that only sport the "latest and greatest" bolt-on upgrades with no attention to ECU modifications? Although these cars seem to be perfectly functional under short to medium-term use, they are often 'ticking time bombs', waiting for the right set of circumstances to self-destruct. Most people just don't realize how necessary it is to have a margin of safety associated with these engines. One owner who lived in northern California had an RX-7 with a free flow exhaust, intake and intercooler upgrade. With the stock fuel and boost management system, it ran a little on the lean side. For several months he drove the car to work every morning with no obvious problems. Finally, on an unusually cold, winter morning, the engined leaned-out and pinged once under boost. When he came to stop, the idle was lumpy and his motor was toast.

A minor engine problem can mean the difference between first and last place. Mostly Mazda's goals is to improve reliability while still offering competition-like levels of performance. Although many may view his upgrade precautions as excessive, Mostly Mazda's performance record on the race circuit and on the road speak for itself.

[ATLskate]

Wow, very thorough. I'd like to become a rotor head, and those few paragraphs helped me understand the rotary a little more. Thanks

[LinuxRacr]

BTW, you really should head on over to http://www.rx7club.com if you haven't already. I hang out on that board a lot, and that is where you will find the best RX-7 info.

[Kenetix]

I know alittle bit about rotaries ..... I own every generation of the RX-7. And Linux is right, rx7club is a good place to go, also might want to try mazspeed.com This is a first Gen site but these guys know their rotaries.

[Minus]

kenetix, that isnt your renesis is it? *drool
im not a big fan of rx8s but i can imagine that a turbo one would pwn
my favorite rotary would be the 88 savannah

[protegeV]

2 posts, wow he didnt go very far in a year:rolleyes:


hehe(lol2)

[jersey_emt]

haha 0.01 posts per day

[ZoomZoomH]

ah what the fuck, who brought this stupid old thread up?

of course he doesn't post here after he finds a REAL rotary forum

[Minus]

oh.. fuck i guess im the one that brought this one back to life... oops