twins vs. single
 

simple question really, i have a 93 R1 with twins non-seq. i was thinking of going to a single snail. what would you guys recomend for a single and whats the advantages of single over twins and vice versa. my motor is a stage 2 street ported with 3mm apex seals from rx7store.net,

What are your power goals and use for the car?

street car looking for around 400 to 450hp but lots of trq. good for daily crusing but want to smash evo's when needed.

Maybe just make the twins to non sequential? Or upgrade to larger twins.

twins are already non seq. the motor is a stage 2 street ported front mount aftermarket intercooler greedy intake and blowoff all polished, there are pic's on this site of the motor under my name. this is my first fd. im a chevy guy kinda. so i bought this set up with only 2k on the build but after the owner bought all the upgrades racingbeat, down pipe,mid pipe, and exhaust,motor, new turbos, ect..he dropped it into the car put it all together and could'nt find a good rotary mech to tune it.... so the car idled eratic, skipped, so he parked it for 5-6 years untill i found it. i new it had potential and i found a rotary guy so i bought it and we just swaped in a new throttle body played with the apxi power commander, and separate apxi boost controler cpu and she runs good just needs to go on the dyno to clean it up because it hesitates at 4000 thekinda kicks back a little then picks up and is smopoth again. so i have no idea what the #'s are yet, but im running 13lbs..right now untill dyno. i just want this car to be a evo killer. dynotech here has alot of them mostly running 350hp to the wheels. who knows i might even have that after dyno and turnning up my boost... just trying to get some ideas..tunner says everyone else goes single but i kinda like having a twin setup to keep the car value up and i think its just cool factor too..

Thanks for saving a FD and joining the Club! A few suggestions and thoughts!

1) Paragraphs. Please! =)

2) Running over 12psi on stock twins whether sequential or not seems to drastically cut down on their lifespan.

3) Polishing does not effect HP or Torque (Ha,ha! Sorry had to throw that in!)

4) Check out the Single Turbo section for great information on your specific goals that have been covered many times.

5) What does your current fuel setup look like? Injectors? Pump? Etc.

6) See #4. Will be interesting to see how you build her up!

850 primary & i think 1600 or 1700 secondaries. the twins are new and i think a little bigger have to check. im still learning the car and finding out what's what.

i believe the fuel is a walbro pump with under hood reg & gauge.

just mentioned the polished part cause i think its cool to look at and adds to the good looks of the car.

got some hesitation gremlins at 4000rpm however i found some grounding spots to go back and check as listed on the site. also the battery is relocated to the rear so im going to check every ground recomended by aaroncake.net.

still learning all the quirks and stuff and love the website! info info info! feed me semore! lol!

Did you do the non-seq setup? If so how so you like it compared to the sequential?
I'm sure a single would be fun but make sure you do it right.

Depends on what your power goals and use of the car will be.

GT35R turbo kit with supporting mods.

new info!
 

ok I just did some research and found some of the goodies my fd has.

#1. bnr stage 3 turbos non-seq

#2. nippondenso fuel pump

#3. stage 2 street port motor from rx7store.net

#4.racing beat dual tip exhaust, down pipe, mid pipe, no cat

#5. greddy dual intake, front mount intercooler

#6. apexi fc + comander

#7. 550 primary + 1600 secondary

still needs tunning bad, breaks up at 4000rpm to 5000rpm then rips again.
just wondering what hp and trq #'s i could expect with this config???
if i can get at lest 400hp i'll be a happy and by the way this whole build has about 1600-2000 miles on it.

ok new update, my primary inj. are 850cc. thank you smg944. found smg944 through this site and met up with him.
seems to me he knows his stuff and owns a fd himself. so i dropped my R1 off at his place in cranston. im having him do some little mods a meth kit and some other goodies and off to the dyno at dez racing. so i should have the little purple porche eater up and dialed in in about 12 days.

thanks goes to this web site for all the info and allowing me to find a fd tunner close to home. ill post the dyno sheets soon. thanks again everyone

man sounds really good so far!!! please post up dyno numbers when your done, im also a new FD owner and wondering how the twin setup does, im thinking of either staying twin or going single also..lol !!

How much did you get it for? If you don't mind that is....

Sounds like a stout build btw.

a single set up will be less complicated an just a cleaner look im my opinion

single setup is a great choice. go gt35r turbo will put you in the power ranger you want

T51rh34d
Or
Garret gt47
Bigger is always the answer

well i got the fd for $16k, which in my opinion wasnt bad after shopping around ebay and other sites for about 3 months. it has a mint interior, full body kit molded in and the headlight conversion as you can see in my pictures. plus the fact that the car has 0% rust or rot. it was stored its whole life and with the mods and new engine build i think it was a good deal for a rare fd.

the twins vs. single question opened a whole new can of worms. so far i have heard from both sides and they both have their strong points depending on what your going to do with your fd. right now i found out im running a new set of stage 3 bnr's in non seq. mode. look up bnr turbos stage 3 on the net. the idea of this setup is to still have instant boost at lower rpm and also work like a single by running non seq.

bnrsupercars.com

426 RWHP and 365 RWTQ was made at 18 psi of boost!

this is what im looking to come close to as i can with all the mods done and adding a trunk mounted methanol kit this week.

Low budget stay twins
You want power go single :)

yes, i have also heard to go single for big power.

well yes a single will look cleaner, however I feel our cars will retain more value if they are in fact a real twin turbo car as there are few good condition ones left in the usa. I also believe that in a car as light as ours 426 RWHP and 365 RWTQ is more than enough power. very few people have had the chance to ride in a fd that puts down these #'s for real not some gestimate or claim. I own a 2006 chevy avalanche ss thats procharged with meth injection, and about $30k into the drivetrain. the truck puts down 565rwhp on a mustang dyno. it runs 12's at new england dragway. now that said, the truck weighs 6000lbs..so a fd 3400lbs less weight even with 125 less hp will still be a low 11 or 10 sec. car. how many daily driven cars can do that today?

i think there is a certain cool factor to a single, like looks when you open the hood there's a giant snail stareing at you, and it does make the tunning and things simple vs. a twin set up.
im not knocking singles in any way at all, from what im learning here in a short time i do believe as i said before they both have advantages depending on your applacation.

i already have the stage 3 bnr's so im going to see what we get out of her. i will post dyno sheets as i get them and track timeslips however we will have to wait for spring for the track slips.

try to stay with the twins if u can

I would go with a Precision Billet 6262!Spool would be super quick

changing twin turbos?
 

hello i was wondering if its possible to have my rx7 to about 500- 600hp my engine is new transmission new my engine is pretty much built for horsepower biggest port straight pipe and i was wondering if i could just swap the stock twin turbos to after market and put them in the same place or do i have to do a whole new set up? I know i have to change my headers injectors and other stuff but how much can stock headers turbo manifold handle?

my turbo pipes are after market and stuff i dont have the stock plastic ones.

its a bit more complex , and its best if you could identify what ports it really is .

you can put those numbers out with the right tune . injectors , and turbo .

as for if you need to upgrade or not ... what do you currently have?

less clutter with the single

Single
 

Im a single turbo guy more power at top end:nod:

Gt35r is a good turbo but with a smaller ar than 1.00 you"ll drop some psi at 6k. Ive seen twins dominate uphill battles due to less lag. But if your daily driving with occasional fun. Setup your two step on ur Power fc and get a gt35r at 10psi before launch and see if that wont put a smile on ur face.

As for my opinion I like keeping cars as they came and improve on it. Unlike other fools dropping v8's on rotory cars and F-ing up the name of rx7 rotary and the weight ratio the car is known for

i would do a single since its a bit more reliable, and if you get a bigger single that will make way more power than 2 small twins

Does the single detract from longevity of the motor

It depends on your setup. If your using a hybrid turbo such as a gt35r having a smaller compressor ar wheel will pack a bigger punch of cfm as you hit boost and will loose psi as ur rpm nears redline . Thus it is recommended having a pcm that can compensate these lean conditions in the shortest time possible. Adding higher pressure can lead to premature step wear on your housings so like I said it all depends on your setup and how well things are lubed

Boost psi is often mistaken for cfm although their related in ways cfm is what will give u hp. In theory engines are essential giant vacuums to gain Hp is by adding more air molecules and compensating with proper atomized fuel for that stoic 14.7 A/F ratio

With twins you will have less lag but it limits power just a little single will give more lag but opens up the possibility of much higher horsepower it depends on what you prefer!

single ftw lol

I went single on my supra to clean up the engine bay. As long as you pic a reasonable turbo you will love it. Bigger is not always better. I went 6766 on my supra but maybe a 6266 would be better suited for you.

If you want alot more power go for single turbo. but then again you can still squeeze enough power on the twins to rape Evo's. I'd stay with the twins besides it sounds wierd saying, " i have an rx-7 fd single turbo " sounds way better saying you have an FD with twin turbos.

what will the car be used for? a huge single would suck in autocross, too much lag. and the twins would limit you at the top if you're looking for a highway runner. op needs more info