I'm still searching for a good Turbo rx-7. I've been looking for a Nice Series 5 Turbo, but there isn't any around. I've noticed that the series 4 Turbo is around 180hp and the Series 5 Turbo is around 200hp. I know its only a small difference but is it noticable ? So should I hold out for an Series 5 Turbo or boarden my search to include Series 4 Turbo ? Is there really much difference between the two models ?

 

The S4 is lighter, so performance is pretty similar.

It's more about mileage, condition, availability, & price.

 

If you can find an S4 or an S5 in good condition, buy it. If you find a nice S4, don't waste your time looking for an S5 in the same condition - you'll never find one. Your goal here should be just to find a low mile RX7, don't worry about the series.

 

The main difference are the looks and price and availability.

The S4 is way cheaper and easier to find.

However, the S5 does have a better turbo and (imo) looks a bit better with its body colored moldings and updated front bumper and taillights.

Your butt dyno most likely wont be able to feel a difference between the 2 cars

 

The performance on an S4 vs S5 is the same with the same mods. I don't see alot of advantages other than side plates on S4 motors not being to withstand as much hp as an S5, but many have proven that theory wrong... I have a friend from PR that runs 9's with ported S4 motor and T72....Its all in the building of the motor and driveline..

 

Here's a good question? Do you just want any RX-7 Turbo? If yes, then get whatever comes first. If you really want a S5, then get a S5, because you will never be satisfied. I for one, cannot take the S4 look, cuzz it looks old. A lot of people wont even care to know what your S4 is. The S5 is the one that make heads turn. I had my S5 compared to someones S4, and they jus talked **** about how the S4 looked ugly and old, while they were saying mine is the ****. Well, everyone has their opinion, but I can gurantee that 75% would pick S5 over S4.

 

ok I have a stupid question. I have searched and can't seem to find what i'm looking to find. I want to know if my 88 AE Rx7 is a s4 or s5 and how do you tell the difference, I'm new to the rx7 world so I'm trying to learn as much as possible. Thanks in advance guys.

 

88 and older is S4 89 up is s5

 

you mean 88 and younger are s4...89+ is s5

 

do they have the same transmissions?
SER 4 EXT

-lateral trim black
-front is even across the air opening for motor
-front turn single lens’s are orange
-have aero mirrors that are squareish
-fin style rims
-square tail lights
-87 has no spoiler (stock)

SER 4 INT

-quarter round gauges
-87 have back lit warning lights; 88 have symbol/letter lit warning lights
-plastic stereo surround
-center console lid flips back

SER 4 Engine

-pre 87.5 have low impedence injectors; 87.5 and up have high imp, but are still square
-square afm
-has two water fill caps
-twin scroll on turbo with manual wastgate and small wastgate holes
-mechanical oil metering pump
-smaller inlet pipe on intercooler
-lower compression rotors
-heavier flyewheel

SER 4 other
-clutch style LSD

SER 5 EXT
-trim pieces painted to match
-front is recessed across the air opening for motor
-front turn signals are clear with orange bulb
-have areo mirrors but are rounded
-have spoked style rims
-have round tail lights
-fog lights in brake ducts

SER 5 INT

-half round gauges
-rubber stereo surround
-center console opens sideways
-automatic seat belts

SER 5 Engine

-new style injectors with oval connectors
-round afm
-has one water fill cap, plastic
-improved exhaust mani with larger electrically controlled wastegate
-electrical oil metering pump
-larger inlet pipe on intercooler
-higher compression rotors
-lighter flywheel

 

My 86 is 18 years old. A 90 is 14 years old. Now which one is younger and which is older. Let's hear it for ruthless's math skills .

 

All i have to say is my S4 is faster then an S5 and as fast as a TII Not N/A for long though!

Edit:i meant quick, not fast..

 

ask a S4 owner which year is the best and he will say 'S4' ask a S5 owner the same question and you will hear 'S5'.

Just know this: Grass roots motorsport recomended an S5 over the S4 (N/A cars) because it has more power and the weight difference was less then 40lbs.

The S5's have better electronics, too. S4's have bad soldering on the ECM; and flooding problems which are very rare in the S5's.

you also get the nicer radio surround, and all the bodywork like the better nose cone and tail lights that all the S4 guys pay big money to put on there cars.

S5's also dont have vaccum powered 5th/6th port actuators, so your free to do anything you want to the exhaust with out having to deal with those ports not opening.

 

-pre 87.5 have low impedence injectors; 87.5 and up have high imp, but are still square


is this true? i have an 88 10th ae, i know they are high imp, i bought 720ccs low impedence, are the stock plugs square? becuas ei know 89+ are oval and they need to buy the connectors. do i need the connectors?

eric.