would it be better to convert an RX-7 with a single turbo or just leave it as twin sequential? which would be better and why?

Depends on power goals you have for the car. If your looking for big power then single turbo is the way to go, you have many options when choosing turbo specs to suit your driving style. Stock twins weren't really designed to run high boost and make big power, they will not be reliable.

Single, less exaust back pressure = longer engine life and less chance of heat induced hot spots and pinging.. Even if you get a TO4E with a smaller exaust housing you will benifit from it... and you can get rid of all the sequential boost crap and the mess involved with the stock turbos...

i don't agree with saying that a seq twin can't make big power. if your pushing 350+ rwhp on a seq... that power comes right away... no lag. i think the single is very good if your doing alot of freeway driving ( open roads) but if your using this to drive everyday. in town, in traffic, and also on the freeway... i'd go seq twin. just my 2 cents





here is a post i started a while back... it has some very good points. take your time read though it.

http://www.rx7club.com/forum/showthread.ph...threadid=132036





i know what i want... M2 seq twins

i LOVE my T78............... i would never put such crappy designed turbo's back on my car!

single turbo all the way! https://www.nopistons.com/forums/pub...#>/biggrin.png

Well I guess it kinda depends on what your definition of "big power" is. There is nothing wrong at all with keeping the stock twins, or having them non-seq. I thought my twins were great when I had all the bolt ons and was running 14psi, but once I took a ride in a single turbo rx7 running the same boost I was convinced. The apexi turbo or the xs to4e would my first choose if I was concerned with lag, there is barely any difference between them and the twins, except the power is going to be higher, less heat, and much more reliable and efficient.

I drive my To4R every day with a A/R 1.0 P trim exhaust, big side port, BIG exhaust port, lumpy idol at 1050-1150 rpm, solid engine mounts, solid diff mounts, solid tranny mounts, a ORC triple plate clutch, cusco diff, 315 Nittos on the rear, fairly stiff RSR suspension...



and when I push the gas the fucken car moves, sometimes sideways!



I'm sick of sissy’s bitching about boost lag, the suspensions too stiff, the car will vibrate... wawawawawawawawa! https://www.nopistons.com/forums/pub...O_DIR#>/11.gif put a supercharger on your car if your worried about boost lag...



I'm sleepy and in a not so good mood... :smirk:

mine isn't quite that bad but it is a pain in the ass to daily drive.... LOL

Fucken *****.. lol https://www.nopistons.com/forums/pub...R#>/violin.gif

has that A'PEX turbo the same power output as the T78?

Single or twin? How about these twins?

wouldn't go single here :yum: LOL

That's fucken great.. I'm back in a good mood... https://www.nopistons.com/forums/pub...#>/biggrin.png



O' Jerk, I got my packages today.. thanks.. :bigok:

yeah... i agree that the single is a thrilll to drive... but i drive my car about 100 mi a day. i live in the san francisco bay area.. traffic here is not the best... i don't get to drive to much on a open road, and that is where the single can be used.... i think a 400 rwhp seq twin would take a 450rwhp single in the streets..

again just my 2 cents

The apexi is small the greddy is big. The t-78 will make a lot more power than the apexi, but the apexi will spool faster. Just different options to look at when choosing turbos.....big or small, more lag or less lag. People worry too much about lag anways, unless you go HUGE its not that big of a deal.

Well no, because when you are racing light to light, drag racing or whatever, your in high rpms....so 450rwhp is going to walk all over that 400rwhp car.

yesyes, lag or not. have seen/heard about so many turbos now and know their performance. but I have never seen that A'PEX turbo so I asked. it would be nice for me because I have their f/m I/C.

The apexi is a good turbo, especially for upgrading over the twins and daily driving. Its no drag turbo and won't make 450rwhp, at least i've never seen it done. Here is my car with the apexi turbo....

In normal driving your not boosting therefore lag is irrelevant.... If you are then your not normal driving and the bigger turbo will show they guy next to you who is boss....

and if your in the right gear you also won't have any lag with a Big turbo as well...

I agree that single turo is the best. Not that twin turbo is or not as good, a true twin turbo setup is awesome and has some advantages but a aftermarket single compared to the hunk of **** that mazda bolted on the engine in the FD.............hahahah there is no comparison.



If you are running 350hp plus on your stock twins then they are beyond their efficiency point and is creating excess heat and blah blah blah..... therefore by bolting on a good single turbo you engine will be more efficient and look better and be easier to maintain.



I drive a FC and I had the stock single on there boostin 14-16psi for years, then I got a High flow turbine, the power levels of the high flow at boost 6-7psi were almost the same as the stock one at 15 psi but without a doubt the high flow turbine was faster and felt much better. Then I turned the boost up on the high flow to 15 psi...........hahahahahahah a



If stock turbos are so good then why are they stock......

well, i wasn't talking about the stock setup.. but i was refering to the m2 ball bearing upgrade... i've never driven a single... but i could only imagine how it would be to drive something that has no low end... then everthing hits you all at once when you hit 4k rpm... i just think that the fd is a very balance car, 50/50 weight and all. i think we all just like our setup different... kinda like everyone likes to put wider tires in the back... and i would too if i went single... but i would like to have the m2 upgrade running at about 16-17 psi, pumping out about 400 rwhp... running 265's all around. to me i think that is a very well balance car, plus you don't lose the feeling the car was built to have... balance!!! best of luck to finding what you want.... just think about how are you going to drive your car.

i've been in a upgraded twin turbo car.... i wasn't impressed. boost control of the single turbo cars impresses me ALOT.... i can hold a rock steady 10psi on my FD all day long. 10psi is like 350rwhp..... :bigok:

Yeah really if your HP goal is only 400hp there is no reason to have lag!!! I dont remember any cars on the circuit racing with the stock turbos and they all seem pretty balanced to me.



as far as tires go, me I run 9J rims all the way around with 225/45-17 tires I guess If I had a FD then I might go to 235's, maybe. Of course this car only rarely get driven on the street and that is just to get me to the mountains to race...hehe For the street I drive a automaic FC with only a air cleaner and muffler for performance mods.

Trust me...that whole Lag thing...BS...if you've never driven an FD w/non-sequential...the lag is EASY to deal with. My car builds and builds and let's just say that the power is exponential....



AND...the sequential turbo's are so small...seriously... https://www.nopistons.com/forums/pub...IR#>/dunno.gif

Turbo lag?!? Turbo lag is what guys with n/a cars feel all day long. At least with a big ol' turbo you have something to look forward to after it's done accelerating like a n/a car. https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

Damn...that's a good way of putting it. I push the gas down at 3000 rpms and I can just FEEL the car wanting to go...by the time that 5000 rpms hit, well...I'm holding on... https://www.nopistons.com/forums/pub...#>/BURNOUT.gif