G's 3rd Gen

iTrader: (11)

Full boost 3400 power to 8000. Moderate streetport..
If you wondering about sequential spooling "quicker" I have jumped out and stayed out in front of two 15+ psi sequential set-ups. Remember when it comes down to fine details of this advanced mod. staged scenerio its not really sequential vs. non-sequential but the whole supporting package as a whole working together ( tuning, open exhaust, port work, ignition, etc.)

thewird

iTrader: (8)

Tune is important too.

thewird

Dudemaaanownsanrx7

iTrader: (23)

when i first got my car i was 18 and the sequential system was working good for awhile, at some point it stopped working right and although having a pretty good knowledge of cars in general the sequential system was a huge mess/maze to me. This was about 6 years ago and i'm not even sure i was on this forum yet.

I went poor mans sequential and was happy to have my boost back, it was more laggy (4000rpm) but i mostly drag raced so it wasnt a big deal. It was nice not to worry about all those hoses and being able to get to other areas of the engine without them in the way.

If i was put in the same situation again at this point i would probably keep the sequential system, but i know my way around this car a lot better and have learned how to learn more effectively.

Now im single turbo and i like how much simpler it is, and think its def the way to go.

slo

iTrader: (1)

My car can be sequential or poor mans NS at the flip of a switch.

Very simple, all 4 TC solenoids (mac valves solenoids) controlled of the same haltech RPM switch, they get power and the car runs on #1 turbo only, take the power away, and the car defaults to NS. The pre control and wastgate are controlled sepratley.

The transition is good too, no spike.

Only about 12 vac hoses including the short supply hoses

mdpalmer

iTrader: (24)

Here's a quick vid of my stock turbos non-seq car on the street. I don't even have a midpipe... yet

HI RES, 95 MB, RIGHT CLICK & "SAVE AS"
YouTube

I didn't even have a chance to put it in 4th gear. Still goes pretty good, about 280-290 rwhp @ 13 psi boost. I don't need massive torque to move the car from a dead stop on the street, but when you're above 4 grand in this thing it moves. I'll give you some timeslips after this weekend with more video.

Did I tell you how much I love my car

93RedDragonFD

iTrader: (16)

Watch out for that car bro! haha, Sweet vid. I am going Non. Seq. as well and tuning for 13 psi... hopefully. Curious to what mods. you have to be at 280-290 rwhp.

G's 3rd Gen

iTrader: (11)

A midpipe will increase boost response and power! Make sure you have the wastegate ported in order to prevent boost creep. More fuel and a good tune and you will be ripping even harder.

mdpalmer

iTrader: (24)

Haha, yeah, that could've been ugly You can check out my VBgarage for mods. I have a light port job, a lot of "bolt-on" stuff and a pretty safe PFC tune by me (11.0:1 AFR, SAFE timing). When I dyno'd last time I was losing boost up top, that has since been resolved I want to go back to the dyno to see how the power is different. There's guys running around with 300+ whp with just as much boost pressure and similar mods

Thanks, your car must be a monster... 370+ whp? Yikes How the hell do you guys make that much power? I would turn the wick up to 15#s, but we have crappy gas out here (91 octane) and it gets hot during the summer. I need to do more tuning homework

thewird

iTrader: (8)

With only 13 pounds, you can do 11.5 afr and still be safe to get more power.

thewird

katit

iTrader: (1)

This winter I spent lot of time re-doing rats nest while checking each and every solenodi/valve with vacuum pump. I used black silicone hose to make it look stock and I used 3/8 spring clamps everywhere.

Car spools very smooth, transition hardly noticeable. I love sequential and after I had UIM off few times it doesn't look like a big deal anymore.

This cars harder to work on then others and more complex, but once you understand and get it right I'd say they are just fine. I have all emissions there also

fendamonky

iTrader: (6)

I've actually been wondering the same thing. I'm only making 325 at the wheels with a VERY strong motor (stock ports) and all the support minus F/VMIC and A/I.


What kind of dyno are you all getting your numbers from to be making that much whp on twins?

thewird

iTrader: (8)

Most people have a street port and some have BNR Stage 3 twins as well. Then it all depends on what else you have and what dyno you do it on.

thewird

94touringFD

iTrader: (30)

After reading this I'll have to talk to my brother and decide between simplified seq or full non seq

2007 ZX-10

+1

non-sequential is the only way to fly, as long as you have a ported wg, hogged manifold, , full (open) exhaust, and lightened flywheel....full boost at 3600, I never miss sequential with the fifty zillion solenoids and all the extra fragile trinkets under the hood, not for a second

I'd roll anyone with a sequential set-up from fifth gear on the highway, I wouldn't be worried in the least

janrx7

i managed 351whp @ 15psi seq turbos on a streetported engine. Don't have problems with sequential system (although the day i was tuning, around 6 vacuums lines got loose and i had to paid for more dyno passes. This suck) Mods in my signature. The day i was tunning i crank it to 17psi and managed 361whp but vacuums lines started to fall apart. Turn boost back to 15psi. All this with sunoco race gas on dyno dynamics.

The other day, my friend's FD with same mods and tuner managed 397whp@18psi with non-seq setup. It has the rich-man's non seq.

Now i want my setup non-seq mainly to squeenze more hp. Worry about lag, but i have a street port and large exhaust, so lag can be minimal.

Do you think non-seq can yield more HP or it is just a realiabity mod?

Dudemaaanownsanrx7

iTrader: (23)

It can yield more power if done right because flow is improved

Rixio_Scon

Sequential > Non Sequential

You put 2 cars with identical mods except for the seq/non seq system and the seq will be superior in every capacity...

Granted there are problems with the stock seq system but imho for every application, track, street, drag the seq system is superior.

It doesnt take much effort to have a fully reliable, working seq system. All it takes is time and patience. Maybe if those who spent their time going non seq, had rather spent the time going simplified seq or similar they would have a different opinion.

I have been fortunate enough to own single turbo powered** and twins powered cars at the same time & I know which one I preffered driving


**(Essentially the same as non seq )

Dudemaaanownsanrx7

iTrader: (23)

The reason a non sequential can make more power is you can remove a few restrictions caused by the doors and flappers then port those areas out. This increases the VE of the engine. That allows more air into and out of the engine, which in turn makes more power.

dgeesaman

iTrader: (7)

I agree.

The difference can come from 2 places:
1) Comparing a non-sequential system that functions at full boost to a sequential system that wasn't operating at full boost
2) Comparing a non-sequential system with ported turbo manifolds, all flapper doors removed, etc. For obvious reasons, this is an issue of the advantage of porting, not the advantage of being non-sequential.

Gordon, I agree on all points. Electromechanical actuators is actually much more interesting to me than better solenoids or superior vacuum hose materials. If (when) my sequentials misbehave I'll poke around at that.

yourmom23

iTrader: (4)

Good point on it being more linear. As far as sequntials go i feel that they were made to work well with the stock cat. This is where the seq would have the advantage, is with a stock cat. Also i believe poor mans seq would still give the advantage to the seq system.

Ok so now i do believe the non seq can be superior if done right. If you think about taking the secoundary flapper out and welding it up, that is a lot of diverted air going twards your quicker spool. Then you can take into account the diversion plate closest to the turbos there has to be drag there even when fully open. So i believe with a full exhaust and a rich mans conversion it will be much more superior.

I also believe that if you could fab a after market header for lack of a better word that would be the hot ticket. Ok i am going to try making one along with an external waste gate incorperated. I know everyone says that it is a wast of time but well i have a lot of time on my hands with a water jet and tig welder at my disposal. I am cutting out my flanges this week and starting.

Why? well got to love the sound and well i guess that it and cuz every one says it cant be done or is a waste of time. oh well wont be the first time i did something people didnt agree with

jhowell

if people so worried bout lag y not run a small 50 hp shot of nitrous im just wondering

Dudemaaanownsanrx7

iTrader: (23)

Cause no one wants to drive around spraying nitrous from every stop light. And a bottle taking up space is a bit cumbersome. It would be fine for racing but not a street car

yourmom23

iTrader: (4)

nitro plus turbo equal boom

gracer7-rx7

iTrader: (16)

Why would you shoot a 50 shot of nitrous when all you want to do is accelerate into an opening in traffic in the next lane?

You need to think about it not in max power potential but from the perspective of overall drive-ability. From that perspective, it is very nice to have power and torque throughout the rev range. Having 10 PSI at 2500 RPM w/ sequential twins makes for a car that is easy to drive around town and in various real life scenarios. that is one of the reasons people do an LS1 swap - power, torque and overall drive-ability.

If your the kinda guy that lives his life a quarter mile at a time and never sees RPM below 3500, you may be satisfied by something like non-seq. I say that somewhat jokingly as there are plenty of people who only use the FD as a toy car and drive it mostly in off hours or live in a place where there is lots of wide open roads where constantly being up over 3500 PRM is easily accomplished. Some of us that live in more congested areas appreciate low end power and torque and overall drive-ability.

If you have a good setup, you can theoretically make more power Non-Sequential and you'll make it higher in the RPM range compared to Sequential. If you have a good setup, you can make pretty much the same power Sequentially and have more power lower in the rev range.

Sometimes that half second it takes to downshift a few gears and build boost to make the hole in the next lane is too long.

jhowell

yea gotcha it seems like gettin to 3500 rpm isnt hard wut do rx7s idle at? 2k?