ChitownR1

OK I was at a Chicago area RX7 meet this weekend and I was told by one of the guys that their buddy has a FD and it has the stock twins running at the same time instead of one then the other. I guess he has them both running at the same time instead of running them squentially. I might be tottaly wrong on all this but this is what I heard. I was told his car flys runnign both the stock twins at the same time. Anyone able to tell me what this mod is and how it's done and some of the effects it has on the car.

I know I will prolly get flamed on this but I have only owned my rotary for about 3 weeks.

Thanks in advance guys.

RX7 RAGE

iTrader: (22)

It's called non sequential or parallel turbos.

ranchan02

iTrader: (4)

Just do a search for non-sequential and that will point you to what you want

LOL...you beat me to it Rage :P.

AWD-RWD racer

iTrader: (5)

its called non-sequencial (*sp) there is a cheep and expensive way to do it.

TRISPEEDFD3S

iTrader: (26)

What are you doing on the forum Gene, you're supposed to be out camping for OUR new PS3 HAHA!

RE-Amemiya

My car had the sequential set up and i've ridden in a non-sequential car.

Non-seq; boost won't kick in until about 3k rpms, so you lose that little bit of extra low pull that you get with the stock set-up.

Not sure if it's really "faster" or not. I'm sure somebody else could help you out there.

TRISPEEDFD3S

iTrader: (26)

My buddy has full non sequential, and I took a ride in his car, and his car is a whole lot faster than my car. The pull is harder. The lag is not that big of a deal to me. It's what I'm going to do when I go BNR stage 3.

illusionzx

the whole point of the bnr stage 3 is to run sequential...if you aren't then just go single turbo.

LovMyRx7

iTrader: (7)

^^^^ Do you know what your talking about?

matty

^^he is right in my opinion.

Keep them in sequential mod. if u want alot of power get a single.

You could make alittle more power in nonsequential but its not worth the extra 5-10rwhp considering u will now have some lag as oppose to instant boost that u get with the sequential system. PEople go NS because they have a boost control issue somewhere that they cant track down. I would put my sequential car against any NS car on a roll on any day. I would wager that my car is a **** load more fun to drive as well.

The only way i am dealing with lag is if atleast 450rwhp is gonna show up when she is spooled. not for 350.

Vader

Non sequencial is great for people that want to simplify their car for reliability reasons....whether it be because noone around them really works on rotaries or just becuase they don't want the hassle and possible expense of having to keep track of the various sensors and vacuum lines. I haven't gone non sequencial, but I will if I keep the car in the twin turbo configuration.

matty

the sequential system when functioning properly is awesome. i suggest u find someone to fix your boost issues as oppose to just throwing **** out cause of your own fustration.

Vader

Excuse me. Who said my **** wasn 't running?
Actually, without hopefully jinxing myself, my **** is point right now. I'm very happy with it. I just like a simple car, and i'm not sure that my sequencial setup is that much of an advantage to a non sequencial setup.

matty

dont say i didnt warn u.

ChitownR1

so yea about that series and paralle setup. lol

Vader

We'll see what I do. CT's not that far from me. Maybe we'll have to to do a couple of runs.

rynberg

Sequential vs non-sequential doesn't matter in a race. Above transition, both turbos are running in either setup.

Pros and cons have been posted ad nauseum on this subject. Jeez, how hard is it to use the search function? A quick check would reveal a few nice long threads with all the old timers and heavy hitters posting in them. You'll get a lot better info than you would around here these days....

Vader

I was merely having fun with him.
My post numbers say i'm a new member, but i've actually been here for years under another name. Believe me, i've used the search function more times than I care to remember.

rynberg

Vader, I was replying to the OP, not you.

Vader

matty

i disagree rynberg. i think the quick spool of the sequential system gives u a huge advantage. i have raced and beaten two other fds that have made more rwhp than me. it was due to the jump i got from my quick spooling system. thats real world experience not bs hersay that most people post. In fact most cars i have raced even those with monster torque i pull away on the intial punch with a quick spool and lighten flywheel

You are right thios topic has been beaten to death and its been pretty clear that the sequential system is a way better setup than ns if its runnign properly. To do away with it and downgrade your car b.c u cant figure out an issue is silly in my opinion and straight up bad advice to a noob.

Additional, no **** both turbos are online above 4500rpms. i was clear in saying that the quick spool is the advantage when racing AND what makes the car more fun to drive. if u guys feel otherwise thats your loss.

Vadar...go NS and lets meet up. loser pays for gas.

BuffDaddy915

I MIGHT be goin non seq. this winter. I havn't completely decided yet. My goal for next spring is 350 to tha wheels. I have a feeling that 350 on the stock seq. system will cause problems. Seeing as I have problems with it already..and I dont have that kinda HP.

I like tha feel of the seq. mode...but also dont wanna be under the hood all tha time if a hose pops off and Im limited 2 5 psi n what not.

matty

i havent been under the hood once due to trying to fix issues and i been making 340-360 for yrs.

BoostCrzy

i have dyno'd both seq. and non-seq. and can tell you that a bpu car with non-seq will make more power under the curve up to transition ...... this is @ 15psi....from 3800rpm-5500rpm in 4th gear there is about a 20-30whp difference from seq. to non-seq. .....plus the linear spool is very desireable for corner control in tight road courses.....but as for the street....you will see a slight decrease in low-end spool....but the mid-range is far superior with the turbos in parallel.....again this is a full BPU car....stock ports...

rynberg

You know, if we are going to have another debate about seq vs non-seq, let's stick to FACTS.

BULLSHIT. You must have had a poor transition. Non-seq is going to make more power than seq from 3800-4500 or so, that's it. Much less below 3500 rpm and about the same above 4500 rpm.....

Again, worthless argument. On a road course, the turbos will always be in non-sequential mode, whether you are seq or non-seq. Unless you can't drive.

50 lb-ft less torque at 3k rpm (more of a deficit below that) is not a slight decrease in low-end power for STREET driving. It's a 20-25% reduction in power at an rpm range you would actually drive in on the street.

Let's stick to FACTS here:

SEQ
pros: much better low end for fun street driving, still runs in linear non-seq fashion during hard driving
cons: more complicated and less reliable control system, transition can be difficult to tune at higher boost levels

Non-SEQ
pros: more reliable and consistent control system, slightly more power in narrow band in midrange, slightly more power up top for FULL non-seq
cons: shitty low-end for street driving

Those are the facts, you pick what works best for you and go from there.