With attention to primary boost, and lowering transition rpm (pfc, ems), this will not be the case. Check the ~12 psi dyno comparo table I posted, prev page. And punch response will be much quicker below 4K for this proper seq'l set-up.

One of several reasons to go ns on stock turbos is if there is a seq related problem, and if the $ or know-how is not available to fix it. The NS option gets u going again quickly, and with much more reliability.

 

..Rikki,

Check out my mods in my sig. I wonder if my M2 ECU is preventing me from spooling up faster? I also suspect that if I get my wastegate ported - and dumping the restrictor plates, thus maximizing the exhaust flow, I might be able to get to max boost sooner on the tach. I'm just not ready to tackle the job of porting my wastegate or shelling out $600 bucks to have a shop do it. At least not yet...

Any other suggestions?

John

 

Damn, I didnt realize this thread was still alive and kicking haha

laujesse2 - I said I'd known about my typo since I started my profile years ago. It really doesnt bother me, its like tradition. Oh yea, all the Cosmo turbos I've seen were NOT the same as our turbos. They are much smaller. Might be a different model cosmo from what you were looking at I dont know. I dont know much about the cosmo's but I have seen a handfull of the TT's from them.

Here is how I see it in regaurds to seq versus non pro's and con's.....

Pro's to non seq - Remove rats net for simplicity and helps with shaft life on secondary turbo if your running high boost.

Cons to non seq - no power in lower rpms, way more lag than the seq set up. In my opinion the additional lag and loss of bottom end sucks for a daily drivin car.

Pros to seq - low end power, you can also simplity the rats nest, remove the rack and everything and keep the seq setup which is what I've done. Its much cleaner than stock and not as troublesome. Makes for FUN DAILY DRIVING!!!!!

Cons to seq - rats nest if not simplified, not quite as much mid rage from 3500-4500 as non seq, harder on 2nd turbo shaft if running alot of boost.

MOST people agree that you dont get any more accelleration from non seq versus seq.

Personally with my seq system simplified I prefer it. It really boils down to how you drive and what you like. There isnt a all around better solution that EVERYONE will be happy with.

STEPHEN

 

The 3' ***** thing was just a joke directed a Rikki.....see he actually started this whole thing haha. He said this was going to be a big pissing contest and I said I cant **** very far but my 3' dick makes up for it. See its actually all Rikki's fault.

This is one of the more interesting threads I've read in a while, it has humor and debate with emotion all wraped up in one nice thread.....it even has some knowledge mixed in here and there.

STEPHEN

 

They are the exact same design(flaw), The 2 rotor maybe a bit smaller but they are the exact same thing... and the 3 rotors are also the exact same thing but are alot bigger. Means nothing. Once agian direct quoting me out of context, the point is the homosequential setup was made for automatic trannies not performance. Have you had 5 Cosmo's? Keep it real in Bimingham with your 3' *****.

Sorry I just didnt have anything else...
Stop being so level headed SPO what fun is that.

 

I just want to spar... the topic has been dead for a page or three. Thank you rikki as always for instigating.

 

One more...

The only people who have posted on here saying that there is not a mid range power increase(making them faster) are the ones who have not done it. You say "MOST people agree that you dont get any more accelleration from non seq versus seq". I say that everyone that has actully done NON knows that you do.

 

I'm trying to figure out how with a properly setup NS car there wouldn't be more midrange hp than in a seq car.

Seq. FD 1st turbo has full boost by 2600-2800 rpms - transition at 4500 rpms - from 4500 rpms on full boost in NS mode

(In know that with the PFC the transition can be lowered to like 4200 rpms but most don't do this)

NS FD - If properly set up full boost with BOTH turbos online can arrive between 3200 and 3700 rpms.

What is so hard to understand here - 2 turbos pull harder than one - in the midrange you have full boost from 3200-3700 rpms on.....no transition..just pulling to redline. This a full 500-1300 rpms of both turbos being online over sequential mode. If you are a good tuner then you can make sequential just as good - but a good tuner can work with a NS car and make it even fun to drive in town.

 

One more... its like base rock this thread...

One more thing full boost with one turbine(say 14.5 psi) is not the same as full boost with with 2 turbines, the exhaust flows more freely.

 

silly, your just supposed to believe laujesse2.

note that the only people who have posted that ns makes more mid range power, are those who have not set up a sequential properly.

 

Personally, I think the sequential system kicks ***. I'll admit that I've never tried non-sequential on my FD, but I've owned two other turbo cars (they're probably not the best cars to represent a non seq FD, though). A 89 Ford Probe GT and a 90 Plymouth Sundance RS. I really wasn't impressed with either of these cars' turbos because of all the lag. The first time a drove my FD, I couldn't believe the lack of turbo lag! I was very impressed. It's almost non-existant with a properly working sequential setup, and is blast to drive around town, since you don't have to keep the RPMs up to get power.

 

Your god damn right!

NOTE: You spend all the money and time you want tuning and maintianing your seq setup, and at BEST you could maybe hope to get the sequentials equal to Non as far as performance... but it will be short lived and expensive, we will still be going while your secondary turbine is "In the shop". If you are going to spend LOTS OF money and time dont be a dumb a$$... get a single. These stock turbines suck but I am poor right now so I am thus involved in this rediculous coversation.

 

i cant remember their names but a couple peaple said in this topic that ns makes its power in low rpm then they say you have to downshift to get into powerband

 

Actually yes, we have 4 Cosmo TT engines that we got from Japan sitting in the shop right now. They might have similar design but the Cosmo turbos are much smaller and dont make near the power. I didnt take anything out of context, you said they were the same and I in turn said they werent. What is out of context??? You might have MEANT they were only the same in design but thats not what you said. The smaller wheel makes a big difference on the Cosmo, they are designed for a completely different efficiency range. If by saying they are the same are you really just trying to say the operate the same as far as the seq system goes??? The latest rx7's are seq but its totaly different from our seq (from what I hear). Supposedly the seq system was redesigned and instead of the rast nest there is some kind of box that does most of it. Dont really know much about all that as I havent seen a later model rx7 motor with all that in tact.

What money do you have to spend to maintain the seq system??? I simplified my entire system and was running 15psi of boost with no problems at all. It takes about 3 hours to do.....much easier than doing a FULL conversion ns where you have to remove the turbos and ex housing.

STEPHEN

 

How can you possibly even compare the (long term in case there is any doubt) maintaining costs involved. Non has less actuators / flappers / solenoids to go bad and does not put near as much heat or stress on the turbines.

The 99's are not different as far opertion is concerned but they do have a box instead of a nest (more dependable in theory if the box doesnt grow up to be a problem child) and a 32 bit ECU. I have a few of those harnesses if you want one you can have it they are useless in everyway unless you have a real 99+.

On the Cosmos the point of the post was that seqs were designed for Automatic trannies... no point in bickering over sizes between cosmos and FD's, but it is fun to bicker...

My opinion of you has improved though... Cosmo engines rule!! Well if they are hybrided with some FD stuff anyways. The ultimate 2 rotor race engine by far. Hard to put in a FD though, FC's are cheaper and easier to do so if I run one it will be in a FC.

But damn it, there IS still a performance advatage and it is cheaper and easier and more dependable running non.

 

What can be done to bring non-seq's on faster, maybe 2600 rpms? Could the PFC assist in this. It is my understanding that with a "full" exhaust, turbos should spool faster, therefore reduce lag.

??????????