What are the differences between RX7s ?

charlie · Post by **charlie** » Mon Aug 02, 2004 9:26 pm

I was on 75 today and saw an FC and an FD playing around (I was in a work truck so I couldn't play along:() and I was just curious as to the differences between them. I've always loved both body styles, but I think I'm partial to the FD, but only as far as looks goes. I'm curious because I used to have a FOERST gen DSM and from what I've read they fucked up the recipe on the second gen's. The 2G's had smaller turbos (T25 instead of a 14b), really shitty BOVs, and are apparently prone to crankwalk. I've even heard of people doing 1G engine swaps to 2Gs. Are there similar issues with the Mazdas or are they pretty much similar mechanically?

And I guess, since we're on topic, what did they change with the RX-8?

I know there are tons of rotary experts on the forum, so I'm sure this will be answered quickly. Of course I could look it up, but I'd rather just find out from people who know.

Thanks!

djdorifto · Post by **djdorifto** » Mon Aug 02, 2004 10:01 pm

FC Single Turbo
FD Twin Turbo.

But most people like to do Single on the FD to lower the heat under the hood which is the number mods to do to a FD. Heat is the worst enemy to the FD which for the other cars it is too, but this is much worse. I still want to get one, but te FC is bad ass. To the Rx7 downfall is the Apex Seals, do to being worn out quicker, thats why they need to be rebuilt every 70-100k miles.

Rx8 they took out the turbos (bastards) and they made the seals much stronger, but we'll see once they hit the 70-100k range haha. By then the warienty is gone by then.

EVOsaiyanPrince · Post by **EVOsaiyanPrince** » Tue Aug 03, 2004 5:31 pm

plus the faster car is the WHITE FC WITH THE RED SUNS STICKER ON THE SIDE!!!!!!!. sorry Initial D crack attack. I like the the FC cause it reminds me of a Porsche 944 (one of my all time favs)

Silonius · Post by **Silonius** » Tue Aug 03, 2004 6:26 pm

So what are the FA and FB? It's RX-7 101!

turbofb · Post by **turbofb** » Tue Aug 03, 2004 6:58 pm

SA22 is 79-80 FB 81-85

Kouki7 · Post by **Kouki7** » Tue Aug 03, 2004 8:27 pm

people don't do the single turbo swap on the FD's for less heat, they do it for less vacuum mess. the FD's have one hell of a rats nest of vacuum lines and when you go single turbo with em you eliminate all of it. it cleans the engine bay a ton and also let the power potention soar!

Kouki7 · Post by **Kouki7** » Tue Aug 03, 2004 8:30 pm

as far as i'm aware, there is no FA.

i've seen lots of rotary engines (in FB's and FC's) go over 200,000miles before a rebuild... but they all were stock. no one ever keeps the FD's stock long enough to get that kinda milage. lol...... in stock form the rotary engine is quite reliable. but when you start modding it, thats when your reliability drops. especially if you miss a crutial mod (like me) and then the motor goes pop.

BrokeAssHachi · Post by **BrokeAssHachi** » Wed Aug 04, 2004 12:09 am

if i bought a rotary the FOERST thing i would do is buy ceramic or carbon apex seals.

djdorifto · Post by **djdorifto** » Wed Aug 04, 2004 12:12 am

ha, don't worry its a waste of money and won't last longer than regular seals, this is what am told from the FD guy's that put them on.

BrokeAssHachi · Post by **BrokeAssHachi** » Wed Aug 04, 2004 12:15 am

maybe... from what i hear they handle higher heat.

djdorifto · Post by **djdorifto** » Wed Aug 04, 2004 1:01 am

the carbon apex seals they are great for NA engines. They are very bittle and not good for Turbos. Ceramic is a little better, but lot of guys that are running 400-600hp are on stock seals.

Tunning is the key on the Rotary, they are very bitchy when they don't get enough Fuel, air and water haha.

speedminded · Post by **speedminded** » Wed Aug 04, 2004 10:52 am

Silonius wrote:So what are the FA and FB? It's RX-7 101!

FA never existed, SA then FB, FC, and FD and by this time everyone assumed the one before FB, FC, & FD had to be FA...

djdorifto · Post by **djdorifto** » Wed Aug 04, 2004 11:07 am

ha, yeah thats what i thought we i started to get into the rex's. Its pretty awesome to know this sort of stuff. Its like a 2nd language, 3rd for me =D

speedminded · Post by **speedminded** » Wed Aug 04, 2004 11:15 am

FC came in NA (13b) and single turbo versions [13BT (Turbo II)], also convertible (n/a only in US). All FD's are are twin sequential turbo's, 13B-REW.

Here's a link that will tell you more than you want to know... http://beyondtheredline.fd3s.net/rx7_models.html

djdorifto · Post by **djdorifto** » Wed Aug 04, 2004 11:18 am

wow in 91 they were 27 grand for the Conv.

24grand for the 11th Anniversay one. Crazy how much they cost back then.