Catatonik

How common is this? What kinda power are people making with this set-up, and with the supporting fuel mods, is it a bolt-on affair?

Funkspectrum

iTrader: (5)

No...just no...FD twins are complete hot garbage...

87 t-66

iTrader: (133)

waste of time/money. why do you think a lot of the FD guys go single?

slo

iTrader: (1)

I have FD twins on my FC, run sequential I have 14 PSI by 2800 rpm or so, truly excellent low end performance.

Of course I also have a 13b-rew, and if not for California smog laws I would have a GT35R.

RETed

No.


-Ted

Catatonik

So whats a cheap alternative to the s4/s5 turbos that can be done with bolt on parts?

slo

iTrader: (1)

S4 or S5 BNR would be the cheapest bolt in.

RETed

Are you trying to put this on a non-turbo 13B?
Then there is no such thing...


-Ted

katkaroto

is it a turbo 2?

slo

iTrader: (1)

No, but what does that have to do with anying, I swapped the engine from a FD in (well mostly I used re irons).

katkaroto

well, the reason i asked is because... the thing is, the guy is trying for a fc motor not the fd

Catatonik

Its an S4 Turbo 2 with a fairly fresh motor (80,000km). I already have a 3" DP to 2.5" y pipe and dual mufflers. I dont really want to have to fabricate anything custom for the exhaust in order to up grade. I'm just looking for a simple bolt on swap that can handle maybe 12-14psi. I'll be going with the Rtek 2.1 for those of you about to chime in with the supporting fuel mods speech. LOL!

somebody5788

I think its a worthy project although there will be nothing cheap about it. I think it takes a more complex downpipe setup (dont quote me on this i've got no FD experiance) Also a FMIC would make things much easier. Its a project I would love to do for a fun track car. Not for much more then 275 hp though I would assume.

SouthSideSlider

dont do it realy if you say it i've looked into it pretty much(twincharger,T08,twin turbo,and N/A) its more work then its worth realy you could get a better performing single turbo.

spacemanmort

iTrader: (3)

if you have not considered bnr, you might want to check them out.

http://www.bnrturbos.com/

p4nc7

iTrader: (1)

If you're looking for something "cheap" that'll net better numbers, look for a used BNR on the forums.

arghx

iTrader: (3)

FD twins are good for 320-350 rwhp, about what you'd get from a stage 3 or stage 4 BNR. Except the FD twins are waaaaaaaay more responsive--when they work.

And for the record, I'm pretty sure the FD exhaust manifold and twin turbo assembly will not clear the LIM on an FC. And you would have to run it non-sequentially (unless you did some crazy sequential stuff controlled by a standalone, it's been done before) which would make it no more responsive than a BNR turbo.

ericgrau

iTrader: (1)

The FD twins are a complicated nightmare and are almost entirely responsible for the poor reliability reputation of the RX-7 and the rotary engine.

The advantage of an ultra-sophisticated twin turbo like the one in the FD over a single big turbo is much quicker and smoother response. Small turbos lack power, big turbos have major lag, twin turbos have the power and minimal to no lag. The FD also has a million vacuum lines to pull it off.

It's kinda like asking, "Hey guys, can I hire a ninja and have him camp out in my backyard?" Waaay more trouble than it's worth and if things turn sour you're gonna regret it even more. Just hire a thug instead.

lastphaseofthis

iTrader: (8)

This is what i am looking to find out, the oil/coolent lines are sorted, and i'm running Semi sequential. were the stock twins run one turbo then the other, then both at the same time, i will be trying to make the system to use one turbo til say 4500, then both turbos, which should uncomplicate things and make controlling them with the rpm output of an rtek feasible.

But none of that matters if they won't clear the LIM. surely this info is out there somewere? i've read were aaron cake said a spacer is required, but then titianiumtt post a pic(no longer valid) of them bolt'd in, but i think that was on his 13b-re.

this thead: https://www.rx7club.com/showthread.p...d+twins+13b+fc

arghx

iTrader: (3)

I remember helping one guy in the 1st gen section who wanted to mount them to his engine. It might have been a 12A. His problem was that something wouldn't clear the waterpump housing. I don't think there is a definitive answer as to whether they can fit or not. Somebody will have to bite the bullet and physically test it.

tuscanidream

iTrader: (6)

I thought I read some where that the setup will not physically fit in the FC engine bay.?! If so, you have to do custom work anyways... and I wouldn't waste my time on that setup IMO.

TitaniumTT

I'm going to spank you!

They have their reasons... it's usually in a quest for more power than the twins can deliver

Semi-sequential? No, that's called sequential operation.

They are on a 13B-RE, and they fit by mm's

No, you did not read that, if you did, you were mis-informed. Thanks for perpetuating internest mis-information by squaking like a parrot.

And? You say that as if it's a bad thing.

In your sig, you admit to not knowing what you're doing. Perhaps the smart thing to do would be to stop giving opinions on things that you know nothing about. I have bone stock REW twins.... I'll hit 17+psi at 55mph on the highway by touching the gas in 5th gear.... I'll make 400rwhp by 7k as well. Yup, my setup is a waste of time.

RotaryEvolution

iTrader: (30)

i'm sure it requires a spacer to clear the TII lower intake manifold, at which time the spacing would then render the downpipe unable to clear without mangling it.

it requires a standalone to work in an FC anyways so i'm not really interested in checking whether they can work so you guys are on your own, there's better alternatives out there now for a few bucks more than used twins that make way more power, are less of a headache to work with and don't turn the side of the engine bay into an industrial oven.

tuscanidream

iTrader: (6)

@titaniumtt That's why there was a question mark there. I wasn't sure. No need to be an ***. And IMO means in my opinion. It's an opinion.

lastphaseofthis

iTrader: (8)

The thing is, I have the twins, two sets of them, and all the y piping and an hks downpipe. Fabbing the rest of the piping is going to be no problem either. nore is getting them to run like ******* setup.

if i have to go to an FD intake mani, then i'll have to go bargain with a guy i know who has a spare set.

titaniumtt, if you care to divulge any of your secrets, i would love a good lenthy pm from you. or even a short one filled with links to info.
i want what you have. except with an rtek and a custom made twin turbo controller. even it's all boost sensors/rpm switches and relays, and ghetto fabulous. i wanna see 5 psi at 2000. or close to it. 9.4, or maybe 9.7 will be the ticket.

my motors gotta come out for a rebuild anyways, i guess i'll be the genuie pig.