first of all you never have two cylinders exhausting at the same time...the rest you kinda have right...
twinscroll uses two alternating pulses to spool each side of the turbo...so 4 pulses total. Well, on a 4 cylinder.
Equal length matters a good bit as does the much forgotten equal radius so that you keep the same exhaust gas velocity and even spacing between the two pulses to minimize losses from reflective pressure in the manifold...but that's onto scavenging related topics

 

I suppose that this is true if the OEM design is poor. The AMS VSR will add lag, case closed.

 

Sweet, i was hoping someone would chime in and tell me how wrong/right i was. Just read up on the concept the other day and wasn't 100% on it, Thanks

 

once again, wrong...not saying about ams (I don't know what resonance/rpm band they tuned for).
OEM and poor design has little to do with raising volumetric efficiencies at a given rpm range...if I tune my manifold design to be most efficient at 3000 rpm well, damn it, it WILL help spool a larger turbo but hinder the top end powerband unless it picks up another reflective value...plenum size does play a factor as well as it effects velocity.
Do you really want me to get out some gas dynamics and manifold design calculations to help show you how you are wrong?
A manifold (not saying AMS') can help decrease lag, period.

 

That is correct. However, most aftermarket intake manifolds for the Evo (heck, _all_ of the ones I've seen) are designed to help maximize bigger-than-stock turbos, meaning they are designed to maximize airflow in the upper RPM range, not at 3000 RPM, which ends up resulting in slightly later spoolup vs. the stock intake manifold. While it would be interesting to see a manifold designed to spool even earlier than stock, IDT there's really a market for such a manifold.

l8r)

 

You hit the nail right on the head. Nobody in their right minds would build a manifold for an Evo to give you more power at 3000 rpms. You build a manifold that gives you power where you want / need it.

 

yeah, that's a given...high psi was saying from what I picked up that a manifold couldn't decrease spool up....yes, I've only seen manifolds to improve peak power...now if an auto-x wanted to run in sm with a 2.0 (weight savings per new displacement rule) and run a bigger turbo for top end power...the lower rpm tuned manifold would decrease lag and help level the torque curve for a more driveable car...so there are applications...
just happens most evo owners only care about the straight line...so then yes bigger plenum and more lag

 

yeah, that's a given...high psi was saying from what I picked up that a manifold couldn't decrease spool up....yes, I've only seen manifolds to improve peak power...now if an auto-x wanted to run in sm with a 2.0 (weight savings per new displacement rule) and run a bigger turbo for top end power...the earlier spooling turbo would help level the torque curve for a more driveable car...so there are applications...just because you don't want power at 3k doesn't mean no one does.
just happens most evo owners only care about the straight line...so then yes bigger plenum and more lag

also how many mindS can a person have

 

this has kinda been old news since what?.....the late 90's maybe mid. everyone knows twin scroll will help spool better, and i am very surprised that it took companies this long to actual put it into effect. Like i have said in many other threads, Full-Race is the way to go. Those guys are real engineers that know what they are doing and keep proving it. all these other companies' kits are whatever to me.

but going back to the whole twin scroll thing, i have been there when some friends of mine made a twin scroll setup for the the 35r and 40r. this was a few years back...

 

Any intake manifold that would improve VE in the lower RPMs would take away VE from the upper RPMs. Bad idea

Doing anything to straighten out the torque curve in an RPM band you do not use is silly. Why would you try to force more air into your motor in an RPM band the motor was not designed to have peak VE at?

What you see on your boost gauge is how much compressed air is NOT getting into your motor. Thats why small quick spooling turbos boost spike and then peter out up top. The VE of the motor can not digest that much air volume and then when it can, your boost drops. Then there is the efficiency of the turbo to consider.........

 

[QUOTE=diablo2184;4588819] all these other companies' kits are whatever to me.QUOTE]

so AMS'/bushur's turbo kits are just whatever...? you sir are stupid if you think that these turbo kits propel an evo into mid 8 second passes down the 1320 and are just "whatever"

 

Now now children, theres no need for name calling. Everyone knows full race is the shizzle.

 

I wish full race would built an Evo and shatter AMS's record, Then there wouldnt be anything bad to say about the twin scroll.

 

The AMS drag car is running a 42R, which _is_ a twin-scroll. Besides, if it was as easy as simply slapping a turbo kit onto an Evo to dip into the 8's, everybody'd be doing it. I don't exactly see a lot of Evo's anywhere near the times AMS has posted.

l8r)

 

[QUOTE=EV0lved;4590578]anyone can slap a turbo and run 7s, 8s, 9s, whatever (Peakboost, APS, ATP, . full-race actually engineers there products to be the best. look at there pieces.....gorgeous welds, strong, r&d, etc. what else do i need to say? i have not bought anything from them, but i have seen their stuff on friends' cars in the Honda and Evo fields.

Forget about the company name, but look at the people behind it. Buschur...dont get me started. this guy just has the money to do everything....that doesnt make him an engineer. but like i said, i wont jump into that topic. AMS, not bad at all, but i think Full-Race's designs and kits are better overall.

and this guy is calling me stupid? ha


x2