rexhvn

Hello everyone, sorry to bother you all, i just wanted your opinion on whether you would prefer a single or a twin turbo set up and why because i was thinking of converting mine to single.
Thank you.

Cgotto6

iTrader: (8)

Thanks for joining the site. Now please take the time to read the newbie threads and FAQ at the top of this forum. Theres more than enough info on this subject. Just search for twin vs single, and what not.

BlueTII

It really depends on what your goal is for the car. IF you just want huge power than you have to go single turbo. IF you want fast response and nice bottom end power then you should stay with the twins or a small single.
It also depends on your budget, you cannot just install a single turbo and drive your car, you need to upgrade your engine management, fuel, IC, Exhaust, cooling, ignition etc. A single turbo kit itself can be purchased fairly cheap, but all the other components that it takes for it to work properly will set you back $5-$10K dependind on if the parts are new or used and which ones you go with.
A lot of people convert their twins to non-sequential, which is an intermediate step towards a single, this allows you to simplify the emissions and install an EMS, while still keeping most of the stock components. This gives you a chance to upgrade in stages, unless of course you chave the cash to do it all at once.

dgeesaman

iTrader: (7)

https://www.rx7club.com/showthread.p...ht=single+twin

https://www.rx7club.com/showthread.p...ht=single+twin

https://www.rx7club.com/showthread.p...ht=single+twin

https://www.rx7club.com/showthread.p...ht=single+twin

https://www.rx7club.com/time-slips-dyno-121/finally-bnr-stage-3-high-boost-dyno-results-442095/

https://www.rx7club.com/showthread.p...ht=single+twin

https://www.rx7club.com/showthread.p...ht=single+twin

(search terms = 'single twin')

GentlemenVII

single all the way it is the least complecated of the two set ups unless you get a bolt-on twin upgrade. Plus if you go single try to get a twin scroll one

MrRx

iTrader: (1)

Stock twin = best responce vs hp
Custom Twin = Good responce, good hp
Single = Ok Responce Best hp

rexhvn

When having stock twin turbos, what is most amount of boost that you can have with and without ann upgraded ECU. I have searched but there are so many different answers!

tdazmansFD

iTrader: (1)

I believe 14 to 15 psi would be the most. There's people running that in the upwards of 350whp with the non-sequential modification. Keep in mind that once you start adding mods to your car you'll need to invest in other power products to support the additional HP. ie. ecu or ems, fuel injectors, exhaust system, radiator, intercooler, gauges etc...

Oops! I just read your thread again and noticed the "without an upgraded ecu" part. My answer is: Not much more you can do as far as raising your boost. You can add a couple of mods safely and extract more HP with the stock 10-8-10 boost pattern and your stock ecu. I would not raise the boost level at all without the appropriate ecu uprades needed to support it.

rexhvn

Thank you tdazmansfd and yes i wanted to know with and without so thank you.

rexhvn

Would 12 psi with a stock ECU do you damage to the turbos?or engine?

RX-7racer88

It's kind of what type of responce you want. The twins are good for faster spooling/responce where as the single has a little more lag but more top end power. It's posable to get around 350-375 whp off a good set of enfi twins. proper tuning on a good twin set up can get you in the 11s. A good sized single will make you run 10s and less with no problem. Just remeber if you do a single turbo set up. Alot of other mods will need to be done. Pushing 12psi on the stocks with the stock ecu is kinda pushing it. By geting close to hiting fuel cut off. I would recomend lest do a power FC ecu if you keep the tiwns or go single. It will work good with eith set up.

rexhvn

I'm only going to use it as a normal everyday car but of course need to do the upgrades and want it to be as reliable as possible, as a rotary how can you not fly?
What mods do you think will keep it reliable if any?
In regards to a turbo upgrade after the ECU and fuel injectors etc....what do you think is a good turbo upgrade?

rexhvn

Can anyone tell me their modifications in their twin turbo setup please?
Thank you.

dgeesaman

iTrader: (7)

Get familiar with this information first.
https://www.rx7club.com/showthread.p...threadid=27094

In a nutshell, the stock ECU fuel cuts at 12psi, so I don't recommend running a boost tuned higher than 11psi on it. The stock fuel system reaches it's limits around 13 psi, and the stock turbos run fairly well up to 14 or 15psi (although they won't last as long as at 10).

Then take a look at http://dyno.zeroglabs.com/dyno.php and the dyno section of this site for some examples.

Dave

DMoneyRX-7

iTrader: (2)

Convert your Sequential setup to a Non Sequential. You still have nice acceleration (not as much as sequential but i can still do donuts and burnouts), really good top speed, and more reliable (better engine life). Mine was converted before i got it and i wouldt go back to sequential. Plus you dont have the rats nest of vacuum lines to work with.

nopistons94

hey man,

Just to clarify a few things with your post here ..

1.Your "acceleration" wouldn't be changing, what your feeling is less boost at the RPM with a non seq as you would be getting with a seq. Tech the car would be a little "slower" on the bottom end and a little less tq, but after ~3500 it wont be any different then having seq twins.

2.Top speed is the same as with seq

3.I wouldn't say better engine life, your right on the fact of reliability due to less hoses and problems as with the seq setup with all the vac lines, but not any improved engine life or saftey.

Non seq isn't for everyone. Theres no reason why you can't have a properly working seq system on your FD. Usually, people go non seq because of an easier way out than messing with the seq system.

IMO, seq is the best setup for a street, daily driven type of car.

silver93r1

N00b13

manny34711

i have a full non sequential conversion with a dp and cat back. im running 11 psi to be safe. car runs great never have been better thanks to aleem 'trini' in the forums. bout to drop about 3 grand into the car though, cant wait

Cgotto6

iTrader: (8)

Thank you. I was about to have to correct that guy too.

DMoneyRX-7

iTrader: (2)

Damnit i shouldnt have listend to maz max then.

MrRx

iTrader: (1)

you have to be carefull about where you get your info on this forum, there a quite a few rotortards who know jack about the car. When In question search, still have a problem PM or ask for one of the Mod's as they will know the right answer more likely than not. Hell your welcome to pm not aim me if you have questions.

nopistons94

a lot of people on the forum just talk from stuff they've read and not experienced. Ever play the telephone game? You know what happens when people read something, interpert it into their own words, then restate it on another thread. Then a noob reads it and game over ha.

rexhvn

Thanks everyone. congrats Manny 34711 that your putting another 3k into, what is the three k going towards?
I'm just new to rotars so i would like to know everything possible, thank you.
Could someone please tell me the difference between seq and non seq turbos?
Thank you.

Cgotto6

iTrader: (8)

Sequential means the Primary (smaller turbo) comes online first and should be at 10 psi on a stock set up. Then at 4500 there is a slight dip in the boost (8 psi), then almost instantly it should come back up to 10 psi again, but with a power increase. That is when the secondary comes on, and both turbos are running at once.

Non-Seq. is just when both turbos get the same amount of exhaust flow the whole time. Its more similar to running a single turbo. There is no transition or anything.

Sequential will reach high boost quicker and will put out the same hp numbers as non seq. Non-seq is what most people do for simplicity, usually because they cant diagnose the stock sequential set up due to its complexity.

rexhvn

Would seq turbos be better for street drivin cars?
As i am new and not sure about rotarys, what modications would you need in to to get say...running 15 psi?
Thank you.