?'s Fd and the fc3s

Does anyone know the exact difference between the two? I just recently learned of the fd version and it seems there is less to found of it the the fc. Also I was wondering if there was an engine upgrade for the 3rd gen rx-7.



Also I seem to find that most ppl are buying the 2nd gen tis is confusing because as far as I can tell the 3rd gen is far better. Am I missing something?

the price difference

Too many fast FDs out there. I'd rather see some fast FCs

theres plenty of FC's that can beat plenty of FD's....

and the FD is not "by far better" it simply has 55 more hp than the S5 TII and that can be made up by addind a full exhaust system on the TII and then your equal and the FC and full exhaust would cost you way less

the motor is pretty much the same, the FD is twin turbo but is usual changed to single turbo anyways so that makes them even more similar...

and if I am correct, FC's are slightly lighter than FD's

I believe it depends on the model and year of the FC for it to weigh less then the FD. The FD engine has a few durability enhancments over the S5 TII engine also minus the complicated twin turbo setup that tends to have problems.

yea, GTU and GTUs are the lightest models if I'm correct, and yea only a few differences in the engines

actually the lightese model is the S4 base :)

The info has been really helpful thanx all.

reply there is no S4 base, the base S4 is a GTU, unless I'm just an idiot, but I'm pretty sure

EDIT: and I'm pretty sure 91 was the only year with a 'base' model, and I know it had one cuz I own one :)

Actually, the FD motor has more potential than the FC motor. The only reason people say the FC is better is because they have them, trust me, I am one of them. I have an FC that can smoke most FDs, but would rather have that motor with my modifications in my car. Just my 2 cents

we don't care about your 2 cents cuz they are wrong, you can get just as much power out of both of them for about the same price when you include the price of the car... the engine with more potential would be the 20B

yeah, but you are including the price of the car, thats not what he asked. Damn Soyo, get off my ass

Actually, the FD motor has more potential than the FC motor. The only reason people say the FC is better is because they have them, trust me, I am one of them. I have an FC that can smoke most FDs, but would rather have that motor with my modifications in my car. Just my 2 cents


WHAT?!?!?! For the SAME amount of money you can make an FC motor that makes as much HP or MORE then the FD motor.

You would RATHER spend the thousands of dollars for an FD conversion?

Man, I REALLY want what your smoking..

For free, what would you rather have, FD motor in your FC, or FC motor in your FC, for free.

FC TII, more reliable, already has single turbo, came in the FC... thats my vote

^ That's just like soyo :lol2:

I have heard the 20B is a hard engine to come by. Should one be able to get his hands on it what he be looking at for a price range and stock HP?

reply there is no S4 base, the base S4 is a GTU, unless I'm just an idiot, but I'm pretty sure

EDIT: and I'm pretty sure 91 was the only year with a 'base' model, and I know it had one cuz I own one :)

no there was a Series 4 base. It has no sunroof, no power anything, no LSD. Its pretty much optionless

EDIT: here's proof :smile: http://www.aaroncake.net/RX-7/brochure/29.jpg

wow I never even knew that! lol must not have made very many of them I guess lol

I think the FD would equal more sex than an FC would.

I'll take an FC turbo II for all a round value

theres plenty of FC's that can beat plenty of FD's....

and the FD is not "by far better" it simply has 55 more hp than the S5 TII and that can be made up by addind a full exhaust system on the TII and then your equal and the FC and full exhaust would cost you way less

the motor is pretty much the same, the FD is twin turbo but is usual changed to single turbo anyways so that makes them even more similar...

and if I am correct, FC's are slightly lighter than FD's

its not only an hp or engine question.
what makes the FD better is the suspension design.

and for the guys asking about the 20b conversion : it cannot run stock unless you keep the cosmo (the luxury car the 20b came in) ECU, wirering and tranny (wich wer all auto)
a well done conversion will cost around 10-15k$ us and will get you somewhere arround 400hp and 350 lbs/tq
i say keep you 13b if ur power goal is not beyond 650bhp

Most people when they rebuild their FC's try to use FD internals in them. The FD corner seals are better as well as the rotating assembly.
I have 2 friends with FC's that have FD internals.

I had the opportunity to put a disassembled FD motor next to an FC motor. The stock FD ports are huge compared to the stock FC ports. That was the main reason I decided to drop an FD motor in my FC.

In hindsight I could have hooked up an FD and saved money but, like RevvRX-7 said, when someone sees an FD they expect it to be fast. Its so much more fun to have a fast FC and suprise them.

We just had a big RX-7 meet in South Florida and my friend raced a modded FD in his 88 10th ann. FC with a j-spec swap and lots and lots of mods, he ran down that FD and passed it. The FD's stayed away from both of us for the rest of the day. We just raced each other from then on.

Back to the original question. The FD is a better car stock for stock. In its stock form the FD handles better and has more power. The problem the FD's have its that the twin turbo setup is a major pain in the ass. They also get too hot causing shortened engine life. All these problems can be fixed but 90% of the time your buying a car that has endured these problems for 75K miles and is just about ready to pop its engine. Then you start modding it and POP!
The FD's lines are sexy too.

An FC can be bought for about $3500 and with some decent mods can be faster than a FD. It just takes some work. I have seen plenty of FD's with some bolt ons putting 320 to the wheels.

Its mostly a matter of what you want. I love the FD's I think they are sexy as hell but I personally wanted a car no one expected to be so fast.

I expect any car a teenager's driving to be fast. Well any car for that matter... I have this odd mentality that every car that pulls up next to me wants to race-gets me into trouble a lot-I tried correcting this but it doesn't seem to be working. I just get into trouble more.

What exactly are the problems that need correcting so my engine won't pop? Also what intake system cools the FD engine best?

I too find the FD to be sexay and I really want to keep it I will do just about anything to do just that.

Loose the precat for starters the precat cooks the rear turbo and rear rotor. Put on a good downpipe and wrap it with header wrap.

Then upgrade the radiator. Then upgrade the intercooler.

Then get rid of the plastic expansion tank for the cooling system and get a metal one. Pettit sells one.

Change your fuel filter if you have not done so yet. A clogged filter causes a lot of FD engine failures.

If the car has over 75K miles on it start saving for a GOOD rebuild and streetport. That will cost between $3500 and $5000.

wow, well i own an fd, and you all make great points, but i do have to say, id take my fd over an fc anyday

p.s. if your gonna get a street port than u need to balance it wiht a standalone ecu. just my 2 cents

Jims5543 (http://www.automotiveforums.com/vbulletin/member.php?u=94940) : did u use a 13b-rew or a 13b-re ?
the ports on the -rew are larger and its easier to instal in an fc

Seeing as how my engine has seen 8 owners and 98k miles I am probably not going to drive it until I get my reliability mods installed :(

Thanx ever1 you been a great help!


EDIT: I just read that the stock cooling system does a better job then the M2 and pettit if this is wrong please lemme know.