O.k. everyone I need some help. i have an 86 GXL, it seems to be running fine, ive had it a month. no problems or anything. the only i found wierd is that It really doesnt seem to have the ***** it should have. I know a guy with one, all he has is a header, and diffent mufflers, his car seems To be **** faster than mine!?? i may have poor compression or something im not sure! i know my car has really stupid looking exhaust. Who ever owned the car before me, put on a new exhaust, its not performance oriented at all, in fact it actually looks shittier than stock exhaust. But i dont know how much of a difference it would make!! please help me guys!

- Slow Rx7

 

Not much we can do with the description you gave us. It could be the exhaust, 6 ports, low compression, etc, etc, etc...

 

one of the verts dynoed 90rwhp, but she hasn't had a tuneup in forever.

Most of your lacking HP is just from needing the FULL 60K mile service/tuneup. The rest could be clogged exhaust (replace pre-cat with downpipe, performance main cat, catback exhaust).

what's your fuel economy? Usually that's directly tied into exhaust or tuneup (or lack of one).

 

my fuel econmy isnt all that great, and the owner before me didnt take good care of the small things on the car. small things such as fluids and what not... i think i will go take it for a tune up, if you think that will do something..

 

have downpipe if you wont to buy i will pay shipping if you like

 

I think, as suggested, you really should tune up your FC before you conclude or assume It Is your exhaust.
Occams Razor- he states, although dead for well over 800 years "the answers to the most difficult questions,
are usually the simplest ones". Simplify!

 

Once, one of the spark plug wires on my 88 SE fell out of its ignitor (the coil) just enough to not make contact, but it didn't fall out far enough to grab my attention. The car ran fine, but made very little power. Check to be sure all of your plug wires are fully in the ignitors and the spark plugs.

 

bryant, what kind of down pipe and how much?

 

You guys know know what all gets done on rex's when you take em to get a tune Up??? i just want to know if i could do it myself... thanks.. im just tryin to save cash. just cause the guy i always go to is really good.. put he will probably charge me like 150 bucks for the tune... wich i dont want to spend if it can be done myslef! thanks!
- Ben

 

just replace the spark plugs, wires, and check timing also it's porb. a good idea to change all the fluids unless you have already done that.

james

 

Porb. ??? do i have to go to Mazda to get the Plugs? how can i check the timing myself? sorry for all the questions, but you guys are a Huge Help!!!
thanks

 

The plugs are rotary specific, so most likely OEM plugs would be best.

If you want to do the tuneup yourself, go download one of the shop manuals and read up. I think teamfc3s.org has one online.

If you really want to do it all yourself, there's no substitute for the paper shop manual.

 

I've bought the proper NGK brand of plug for my car at AutoZone before. Make sure you get two for the trailing and two for the leading. Just try local parts house's and maybe you'll find them. I've usually got good service out of the factory plug wires but others complain they don't last long enough. Change your fuel filter and air filter also. The air filter is optional if you've done it recently but the fuel filter can get clogged easily with one bad tank of gas. Generally every 30,000 is normal for the fuel filter but I change mine every 20,000 +/-.

 

Take my advice. I've done this on my 1986 Supra and it ran brand new. I swear you will notice a significant gain.

Here is the list:
- Flush engine with STP engine flush (Do a search, some FC owners had good results)

- Change oil and filter. Use compression restorer (this might be controlverisal, but for me, it does more gain and no harm)

- Change spark plugs (get the cheapest one)

- Change spark plug wires

- Clean fuel injecotrs with fuel system treatment (any brand) Use it twice with higher octane gas. After that, fill up with your normal grade gas.

- Clean throttle body with SEAFOAM (many people have good results on FC, I had good results with my cars)

- TPS adjustments.

- Fuel Filter

All these tune ups might cost you around 100 bucks for a DIY'er, but it is totally worth it. The car ran a lot smoother, quiter, and with much better milage! It is also a part of prolonging your engine.

 

its the rx7.com race pipe. 6 port hose, presilincer.