Pnoidrummer

a few questions. first of all is FC3S only the turbo version? and FC isn't? i'm new to this whole rotary but im' really interested since i've done some research. I'm thinking about buying a used rx7 2nd gen, but skeptical on whether to buy a turbo or non turbo version. what is the difference between the turbo and non turbo version? i mean aside from the turbo itself and the repiping. Is the engine block teh same? the rotars? or they upgraded from the non turbo engine. i'm thinkin of buying one and rebuilding the whole car myself as a project car, and to learn more hands on. tell me what you think. thanks

Brody8877

iTrader: (10)

Read the FAQ.
If you want the reliability and a daily driver look into getting a N/A, but if you want power get a TurboII.

Also Dont turbo a n/a.

VacavilleFC

no the blocks are completely different

Pnoidrummer

i'm plannin on buying a 2ng gen FC3s. but had a few questions first.

first off, is the turbo and non turbo engine bay the same like size or w/e and bolt points and stuff?

because i was planning on replacing the engine completely anyway. so i thot i'd try and save myself some money by buying a non turbo fc3s, and putting in a new engine and turbo into it. I heard taht the turbo version of the car has a bigger engine than the non turbo, so i was wondering if the bolt poitns were different.

so will that work? if i buy an fc3s non turbo car, then find a new replacement engine for a turbo fc3s and put it into the non turbo car? would it fit and bolt on correctly?

also what do people mean when they say s4 and s5. i'm trying to gather as much info as a i can, i'm having trouble finding sites that have valid info on the fc3s turbo, and on the non turbo. thanks xD

Aaron Cake

iTrader: (1)

Read the FAQ.

Pnoidrummer

what's the difference between 13b and 20b. did 13b go into fc3s' w/o turbos? and the 20b go into fc3s' with turbos? yeah i'm really new at this. thanks for your help xD. i figure if i don't actually try it, i'll never learn anything

Aaron Cake

iTrader: (1)

The 20B is a three rotor found in the Japan only Eunos Cosmo coupe. The 13B is a two rotor found in all RX-7s from '84 to present.

The 13B came in many forms, but in the 2nd gen it was either a naturally aspirated 6 port model, or the turbocharged 4 port model.

Pnoidrummer

does the s4 and s5 have different size engines? i read the faq and it says it doesn't. same 1308cc, yet ppl tell me they have different blocks. o.0? in the spec it also says 6 port for n/a or turbo. and i hear 4 port is only for turbo 6 is only for n/a. and does TII only refer to the s4's? why do some people swap for TII in their s5's ? i thot s5's come with better turbo's than the s4's did, and they dropped the name TII

Aaron Cake

iTrader: (1)

Same size engine.

TII = turbo model of 2nd gen.

People do all kinds of swaps for all kinds of reasons. Swapping the turbo drivetrain into the S4 NA is the same as swapping the turbo drivetrain into the S5 NA. Very easy if you swap S4 to S4 or S5 to S5.

The FAQ contains definitions for all these acronyms.

Aaron Cake

iTrader: (1)

I merged all 4 of your threads into one thread to keep things clean.

You really need to read the FAQ as it will answer all of your questions.

Pnoidrummer

i did read teh faq, and what ur telling me is different. if u look at the specs like the pages scanned, it says 1308 cc for each engine right? so if it's the same displacement, then why are they different blocks. also. it says each car had 6 ports, and optional turbo. didnt' say anything about the turbo being a 4 port. now i'm so confused now.

also... isn't the s5 just turbo. like its' nto considered a TII anymore cause of whatever they did to it? i read one of ur posts tho before saying it's not worth swapping TII into a n/a shell cause of the work involved for 16+ hp

SpeedOfLife

iTrader: (16)

DAMN, OP = FAIL

Aaron Cake

iTrader: (1)

All 13Bs have the same displacement.

The NA block is a 6 port block.

The TII block is a 4 port block.

The S5 has higher compression rotors then the S4.

There are also other minor differences between S4 and S5.

All Mazda turbo blocks have been 4 port. If the car is a factory turbo model (TII) then it's 4 port.

S5 ('89-'92 models) came in both turbo and non turbo. The S5 turbo is still a TII.

NO! It's not worth swapping an S5 NA engine into an S4 car due to the large amount of electrical changes made during the switch and the gain of only 16HP.

Swapping an S4 turbo engine into an S4 car is totally reasonable. As is swapping an S5 turbo engine into an S5 car. Cross series swaps are a real pain due to wiring changes.

Pnoidrummer

thank you aaron cake. i love you =] haha. oh. did these models come with freon as the chem used for AC? are there kits to swap that out to use r135 or 134 or w/e the number is? and lastly. for the s5, wouldn't it be better to have a 6 port with a turbo instead of a 4 port? so more airflow? or is the reason people don't do that is because 6 port engines weren't built to handle a turbo?

ericgrau

iTrader: (1)

Yeah, the A/C's come with R-12. Your best bet is to hunt down a product called Freeze12 to replace it. That's easier than doing a conversion to R-134a anyway.

Dropping in a turbo engine is hard, putting a turbo on an N/A engine is much harder. Your best bet is to just start with turbo car.

Get a good one: http://www.rx7.voodoobox.net/infofaq/bguide/bguide.html
Don't go cheap initially, or you'll pay more in the long run. Especially with a turbo. If you're on a tight budget, consider getting an N/A and upgrading it instead of getting a turbo and keeping it stock. But for even more power upgrading the turbo is cheaper.

Power Upgrades: performance catalytic converter, performance mufflers, cone intake + cold air intake, VDI (for s4, s5 already has it), intercooler (turbo only). Turbo only: intercooler, tuning, fuel system, drivetrain. s4: search "5th and 6th ports" before upgrading exhaust. s5: just don't remove the air pump.

Handling Upgrades: shocks, bushings, DTSS, springs, swaybars, tower braces. Stiffer = better handling but bumpier ride.

Reliability Issues: thermostat, fuel pulsation dampener, electrical systems, low oil, overheating (don't!), knocking (again, don't; but stock tuned N/A's almost never knock).

Do a search for more info.

Aaron Cake

iTrader: (1)

Yes and yes.

Why S5 specifically?

The 6 port block has more port area then the 4 port in stock form. The turbo 6 port block will make more power then the 4 port, but building a 6 port turbo setup is non-trivial due to the higher compression, bulkier lower intake, and the need to fabricate most components.

Pnoidrummer

oh i see... thanks. i heard that the s5 has wiring problems. and that they're heavier than s4's. i'm so troubled on what to look for. waht do you mean non-trivial tho? so 6 port turbo is not such a good idea? also i hears s5 lsd's tend to stick, compared to s4's.

Aaron Cake

iTrader: (1)

S4s are the ones with wiring problems, and the S5 is heavier then S4.

How to buy guides:

http://www.aaroncake.net/rx-7/buy1.htm
http://www.aaroncake.net/rx-7/buy2.htm

Here's my method of turbocharging the 6 port using a stock TII turbo and manifold, TII injectors, but everything else original NA. Look easy?
http://www.aaroncake.net/rx-7/naturbo.htm