first off i just bought a 88 na rx7 that i think is a gxl, pretty sure its a gxl anyways. but to my questions i tried searching but its kind of hard to search for.
1.when driving in 5th gear around 2500 rpm i hit the gas to take off and it will barely accelerate if at all and it just seems to run kind of sluggish. i am going to do a tune up today and hopefully a compression test. the car also has a aftermarket exhaust(stock manifold not cat, resonating chamber or muffler) and it seems like it is running really rich so i might change the o2 out also
2. i am getting a heavy vibration on the car when ever on the gas and i havent had a chance to get under the car due to rain and that it sits 2 inches off the ground but does it have a carrier bearing on the drive shaft because i am thinking that it is either that or the u joints.
3.does anyone get quite a bit of heat from the transmission or around the tunnel?
4.is the lsd that comes in the fc a 1way 1.5 way or 2 way because i was driving it home in the rain and the *** end was just all over the place and every time i downshifted the car wanted to kick out to the right. it might just be bad tires but it seems like the rear end is locking up intermittently in the rain?

 

Downshift. You're not going to get much acceleration at 2500 RPM in 5th gear. Also check to make sure the aux intake ports are not wired open. That will severely reduce low end torque.

There is no carrier bearing (did you look under the car?) but check both the u-joints and the front differential mount.

The exhaust heat shields are missing.

If the car is of high mileage, it may just be worn out. Then again, perhaps you were just too hard on the throttle and the car is wearing crappy tires?

 

I thought that the 88 was an s4 engine and that the s4 engines didn't have auxiliary ports I. Thought only the s5 engines had the auxiliary ports.
I can't look under the car cause its so low
The car does have a lot of miles and the tires are shitty.
Sorry I'm new to the rotaries.

 

N/A always had aux. ports don't you feel the pull when you go passed 4,000 RPMS?

5th gear in N/A's are usually tall on Base, SE, GTU, GXL, Verts.
Only in the GTUs 5th becomes short.

Check your tires! We don't need you parking this thing up a tree or into someones house.

Have fun. Pics please.

 

If the car is really 2 inches off the ground, how do you even drive it? All 2nd gen NAs were 6 port. S5s also had a variable intake manifold.

 

okay well the person who owned it before me put some homemade shitty exhaust on it and i know that the air pump isnt hooked up into it so i am going to pull the air pump off and put a block off plate on it.
yes the car is literally 2 1/4" inches off the ground and its a very rough ride and no speed bumps.
i realized that that the car doesnt have a rear sway bar either and due with the bald tires the *** end just floats on the highway.
Is there anyway to retain the use of the aux ports with out using the air pump?
or should i just wire them open?
and does the s4 engine have the pulsation damping on the injectors?(i can only find the answer for s5 engine)
and would that have any effect on the a/f ratio cause my car is running very rich, so much so that the car stutters and runs like ****.

 

You may regret this later, but do as you like

A missing rear sway bar will cause more understeer if you still have a front sway bar installed. Your tires are most likely what the issue is.

The S4's 5th/6th ports are activated from the exhaust gas velocity coming off the pipe that connects to the catalytic converter called the split air tube. If you are missing this pipe the ports are not functioning and are possibly staying closed all the time unless the original owner wired them open.

All RX7's have a PD. The s4's are replaceable, the s5's have it integrated into the primary fuel rail which if it goes bad, you must replace the whole rail.

Will not effect your AFR. Rotaries normally run slightly rich, but if its abnormally rich, check that your injectors are not leaking and have them sent out to be cleaned. Otherwise if the car is running very horrible (can't accelerate past 4000RPM), then you have sensor issues.

 

Okay so maybe I will keep the air pump thanks for the advice.
I know the front sway bar bushing are completly gone also.
My car doesn't have a cat anymore but can I hook that up into the exhaust pipe and have it work properly?
Also would the aux ports being wired open make my car run crappy in low rpm?
And I can get my car past 4 grand it just pops when I shift and smells heavily of unburnt fuel(more than it would just missing the cat)
And should I check the dp to make sure its working properly?

 

The easiest way to actuate the aux ports when the exhaust has been changed is to run them off of the air pump. There are several writeups around (check the FAQ). Just keep the air pump, as it might use up 1 HP at the most. The gain in low end from working aux ports makes it totally worth it.

Yes, opening the ports at lower RPM will decrease vacuum, cause more reversion into the intake and generally make the idle a bit rougher.

If the car really does stink above 4K, then have the injectors cleaned at an injection shop.

 

so i made some leaps and bounds today did a tune up and also fixed the timing and now she runs much better the timing was retarded way too much and the plugs were seriously fouled. Also my ports were wired open so i undid that and have started the mod to make them run off the air pump.
Now can i block the pipe from the air pipe going into the air box. because i want to put a after market intake on it and it doesn't have a spot for it.
Also my car is still popping everytime i shift when the car is past 3500 rpm and it wont idle any lower than 1500 rpm. Any ideas?
And i just want to say thank you very much guys my car runs much better thanks to your advice!! i owe you guys big time.

 

Fix vacuum leaks.

Check the thermowax assembly at the back of the throttle body. The cold start cam may be sticking.