whereiscarmensandiego

whats is the best generation motor fc or fd? which one is more boost friendly

joeylyrech

iTrader: (11)

go with the FD block,thats what im building now

staticguitar313

iTrader: (2)

i heard the cosmo motor was, but i'm not sure

MmSadda

iTrader: (2)

the strongest basic motor is actually probably the 12a. because it's carbed, it can actually drive well a good while after it starts to lose compression.

For turbocharging, though, a 13BRE or 13B-REW would be a good base to work with. Seeing as this is in the second gen section, the REW is a much easier swap. Working with a s5 13BT is the easiest, though.

totallimmortal

If your talking about strengh of thye motor any 13b should hold up fine to most powerlevels. It's not like a piston motor, the rotor or housing won't see any damage from excesive power, past i dunno maybe 400 or so i'd think about staionary gears, and if your revving really high you'll need to brace the motor from tristing apart. But generally a street car won't need much of this, and most turbo cars don't need to rev that high, or at least as high a say a PP na. To simplify instalation i'd go with a FC motor. Tuning is more important than what motor you use, a properly tuned stock internal motor will hold more power that the most estesive build with bad tuning

whereiscarmensandiego

so hardend stationary gears then becuase im gonna be looking for close to 700hp and i know its not a good thing but i want to use rx8 rotors as well ill be tuning witha haltech e8 so it should be fine if tuned prperly and its gonna be a semi pp meaning small pp and bridgeported irons. and i was already thinking about adding dowels. basically i wanna start building a mean as motor that will be semi street used. and i was wondering what would be the best combo. becasue i know u can mix and match s4 and s5 componets and what not.

Turblown

iTrader: (12)

REW/RE is the strongest, but S4T2 is the most boost friendly( lower compression rotors)

whereiscarmensandiego

wel mine is gonna be high comp, moderate boost.

DaoNhatHai

iTrader: (38)

Cosmo 13B-RE

MillerLite

s5 fc motor in terms of stock motors, like your question asked. a BRE, REW, cosmo, 20BT or whatever whatnot is a step above the rest of course, its like saying stock v6 or crate 454 yes?
from what i read the fd 13b only has 2 oil or coolant whatnot reservoirs/pumps inside the engine as opposed to the fc 13b's 4, making it much more susceptible to overheating? i read the fd engine needs a rebuild @ like 80000 most the time, some more some less and the stock sequential twin turbos like to go out even before that time.
someone on here with much more technical knowledge of the fd 13b would have to fill my probably wrong propaganda though.
strongest overall for boosting would be the 20b.. theres so much more combustion space for that boost to go!

dean23

for your hp goals i would go with a doweled fd engine.

Will_s

iTrader: (7)

I thought s4 had an inferior back side plate.

Turbo II Rotor

iTrader: (2)

FD or a C/D code 13b-re is the best engine. The A/B code re engines have the weaker rear iron.

whereiscarmensandiego

whiile we are at it whats is the limiting factor of how high a rotary can rev? what can a stock lets say s4 t2 rev too? how high can one be made to rev 2.? the only reason i dont want to go with fd engine is to mess with the mounting but if the gains out way the work then it would be worth it i guess

hhn2002

if your considering a turbo you should not concern yourself with questions of rev limit as much as the NA guys should.

the higher the revolutions the more advance the timing is needed to take advantage of the potential power at that range. go too high and you risk more chances of detonation; Especially if your already working with high compression rotors. want more power out of a turbo rotary? turn up the boost not the rev limit. my 2 cents.
anyone feel free to correct any mistakes or misconceptions.

MillerLite

its been a while but i believe they can get upwards into 12-14k well balanced? keep in mind (and correct me if im wrong) that while your output shaft is spinning @ 8k your rotors are comfortably spinning at 3k i hear any higher than that the combustion time of 'normalish' gas would not be fast enough and it would hit exhaust by the time it starts detonating.

lastphaseofthis

iTrader: (8)

how high can an NA REV? how long can you hold your foot down? PP's will rev the highest. search for 13b PP turbo setups and find there dynos.

MillerLite

quite a while! proof:
http://www.youtube.com/watch?v=iKXaCOj_p28

whereiscarmensandiego

12 to 14k rev dang that is really high and all it is is balanced? dame that beats the crap outa honda boys where would u even get a tack that goes that high?

MillerLite

most street bikes rev that high and much higher than that
i just googled street bike rev limit and clicked the most appealing blurb http://www.biketestusa.com/Article_P...ArticleID=2662 hes revving 18k on his R6

texFCturboII

iTrader: (17)

That's why the timing needs to be advanced, and why race gas is always your friend! Also, at those high RPMs I'd recommend some type of shield for your legs just in case your flywheel shatters! But, like other said before: turn up the boost, not the rev's. Regarding boost handling abilities, IMHO, a 13b is a 13b.

MillerLite

im sure at those tested high RPMs there is no increase in power.. to some extent you can imagine this in regards to the fact that there is such a big power loss past 7500k on stock setup.. which is probably just caused by lack of fuel at that speed but meh who knows... not me


(FLA) Flywheel Leg Armor, its the new trend lol

whereiscarmensandiego

flywheel leg armor thats when u know youve gone overboard. and need to check into R.A... rotary anonomous

ramses666

iTrader: (1)

26b would be the strongest?!? a 4 rotor... only heard of a few ever being raced but impressive to say the least. How about a pair of 13b's? I heard a rumor about that as well. Just hook two motors together... easy... piece of pie!! Someething about Granny's web site had a kit or something stupid... just a legend I guess...

Ramses666

MillerLite

is the 26b the motor from the 787B LeMans car? im sure you have to be a real big name with big money/connections to get your hands on something like that

hook two motors together?? thats probably the best kit ive heard fable about in all the time ive been reading this forum!
i believe SCOOT of Japan has built a 4-Rotor engine out of two 13B-REW's and dropped it into their demo RX-7.