That essentially sums it up. Each exhaust pulse is able to travel independently through it's own bank/runner. Because of this, one exhaust pulse will scavenge the exhaust out of the following combustion chamber once the exhaust valve opens...allowing more air to enter it on the next compression cycle. More air in = more power. There is simply no exhaust interference between exhaust pulses, allowing for a very efficient flowing system.

As I was writing my response, it dawned on me where I was becoming confused. I'll explain it below for those curious.

All of this stems from a natural occurring issue, Exhaust/Intake Valve overlap.

Had this been a twin Twin-Scroll Turbo setup, the Twin-Scroll Turbos would fare no better then standard Single-Scroll Turbos. This is because by the simple nature of the V6 arrangement and using 2 separate exhaust manifolds to feed each Turbo completely independent of the other bank.

...............................................Time: --------------->

Turbo 1 / Scroll 1 would see Cylinders: 1-NP-3-NP-5

Turbo 2 / Scroll 1 would see Cylinders: ....2-NP-4-NP-6

(NP = No pulse)

The above is ideal, as it provides that necessary time to avoid that brief negative pressure window (through valve overlap), introduced into the exhaust manifold impacting the next flow/pulse that is set to come out. This happens because the Cylinder pulses are spread out, from a time perspective, as they occupy different exhaust manifolds. This design allows for better scavenging and better exhaust efficiency.

__________________________________________________


The below is the most unideal scenario involving a single Single-Scroll Turbo and using a single exhaust manifold to collect all gasses and push them through said Turbo. Had Sasha not selected a Twin-Scroll Turbo, this is what our scenario would be.

...............................................Time: -------------->

Turbo 1 / Scroll 1 would see Cylinders: 1-2-3-4-5-6

The problem here is while Cylinder 2 is pushing out it's exhaust gases, Cylinder 1 very briefly introduced negative pressure in the exhaust manifold which slows gasses from Cylinder 2 down, which reduces scavenging effectiveness and Turbo efficiency. Repeat this many times over and suddenly you've reduced your Turbo's efficiency quite a bit.

__________________________________________________


The solution is a Twin-Scroll Turbo to 'mimic' a traditional twin Single-Scroll Turbo setup. This is what the Boosted Performance Turbo kit is. Even though both exhaust manifolds go to the same Turbo, they are kept separated throughout... until they finally meet at the Turbine when exiting the Turbo.

Thus you have:

...............................................Time: -------------->

Turbo 1 / Scroll 1 would see Cylinders: 1-NP-3-NP-5

Turbo 1 / Scroll 2 would see Cylinders: ....2-NP-4-NP-6

Even though the above is actually just one Turbo.

Look familiar? ;) ^^^


Hope this clears it up for others that were wondering. :)

Cheers,
MoulaZ

Also yes, BMW went from a twin Single-Scroll to a single Twin-Scroll setup from N54 to N55 in '09.

Technically as far as the engine is concerned, nothing changed. The exhaust of the Inline 6 engine was still split into 2 channels, 3 Cylinders each, and fed to a separate Scrolls, instead of separate Turbos.

I suppose this could have been for simplicity, or weight saving, or space saving reasons?

This is a diagram of the N54:

You can see what I mean where the Cylinders are split. Important to note though, the diagram is not 100% accurate. They show Cylinder 1-3 going to one Turbo & Cylinder 4-6 going to the other. I don't believe this is actually correct, it was merely for the diagram's sake.

http://www.autozine.org/technical_sc...rallel_BMW.jpg

Cheers,
Emile

Sasha,
If you still have any of those 1.5 kits available let me know.
Thank you.:tiphat:

Does this mate with the nismo exhaust yet or still only fast intentions?

Currently you can get the Fast Intentions or the OEM single mid-pipe flange for a Z. Only the OEM mid-pipe connection works on a G.

Thanks for quick response.



Sasha, would this be possible in the near future?
Im leaning here after the cluster f*** I'm currently in with G*M.

Just have it custom fab like most of us did.

Sasha will send you extra piping without the flanges welded so you can take it ot a shop to have it cut to size and flanges welded on.

I had mine done just like that and connected to the second to last section of my CNT exhaust. I feel like getting rid of my CNT exhaust and looking for something with no resonators.

I'm putting up a portable garage in anticipation for this kit. I can't wait!

:tup:

I am enjoying a long overdue vacation right now, but when I get back the production will resume.

Will you accept a deposite or just wait for them to be done and pay in full?

I'd like to get the kits close to complete before taking deposits.

I understand, if it were me I would feel like the deposits would be pressure

No one wants to pull a GTM. lol.

I thought it...You went there:tup:

Do you have any time frame on when you expect kits to be ready for sale? I'm looking to purchase a kit within the next month.

Don't put a time Fram on it. The best things in life are worth waiting for...

For me the choice is obvious, it's this kit or the fast intentions kit. This kit is more wallet friendly, and equally as good. Easier to self install. It's a no brainer

Not to start a war but how is this easier to install?

you don't have to replace oem headers with turbo manifold. BP crossover pipe bolts directly to the existing oem header flange. WGs and turbo are much easier to access. although you can probably do it without droppong the motor, I bet all the shops installing a FI kit are droppong tbe motor. no motor drop for BP

There we go. Thanks.

:tiphat:

not to mention that FI is using Garrett turbos.I've not seen the installation manual but I believe they are water and oil cooled, meaning you have to tap both systems to get the feed and return. the BP kit uses precision which is oil only. sasha pulls the feed from teeing the oem pressure sender port and the return goes to the tap already in the oil pan spacer.

the FI kit is fantastic but its one I would recommend having a shop install. Sasha's kit can be installed in your garage in a matter of a few days.

I'd like to have the car boosted and get some use out of it before it's put away for the winter. I'd prefer to go with BP from the research I've down, but if it's going to be 6+ month wait, I'll look into other options.

Fair enough, just giving you my opinion. I was planning on doing the install during the winter to give me something to do, but obviously if the kit rolls out before that time I won't have enough self control to wait :-P

You'll be tearing those boxes apart as soon as they arrive lol. Have you already purchased yours? Hopefully he'll take orders in the next month or so.

This is how you do it!:tiphat::tiphat::tiphat::tiphat::tiphat::tiphat

Hey Aviator44 and AlexRaymond19 what other upgrades are you two doing to go with your kits?

Stock internals, CBE, Southbend clutch/flywheel, and HD CSC kit.

Nice, same here plus GTM oil pan, Boost controller, Gauges, Motor mounts, Differential bushings, CSF Radiator and CJM S1 RFS

I'm replacing my open diff with the quaife right now, have the rear bushings, doing the specialty z clutch, need to pick out guages, and I need to upgrade my brakes at somepoint. I also want to get the upgraded motor mounts and Trans bushings, and I want to do a full set of sways

Can your kit be used with FI long tube headers? Or is it best to use the oem headers?

it cannot. the crossover pipe replaces the factory cats and connects to the triangle flange of the oem header.

Are you going to redyno on Jtrans new Dynojet? From the numbers I've heard so far, their Mustang dyno was reading much lower than we all thought. Looks like you can add about 20-25% to your old numbers.

That's one of the other things I've been waiting on. haven't been by the shop in about a month. does henna it yet?

Yes. They mounted it in the slab last week. The black Nismo read almost 100 ft/lbs higher than it did on the Mustang in cold weather. I don't remember the exact numbers. We were just BSing about what we expect out of my setup.

holy sh!t! that black NISMO and I put down just about the same numbers. I'll have to run up there and see jtran soon.

I'm down for the next batch!!!

Same here!! Hopefully he start taking deposits soon

I'm down too. What I need is a good estimate on when this next batch and the one after will be. It would greatly help me plan my savings/spending s.

I'm sure there's a lot of us waiting for next batch, I'm in also!!!

Well, it took a while, but all PM's replied to.

A large number of you have asked to send deposits. I am sorry, but I am just not ready to take those at the moment. I am currently ordering materials for 10 complete kits, and will start the fabrication on those in the next month or so. Once the kits are close to complete....as in IC pipes are being powder coated, and the exhaust piping is fabricated, I will be accepting deposits.

I don't like to hang on to people's money for a long time (1 month or longer). At the same time the added pressure I put on myself once deposits are in is something I also like to avoid. Hope you guys understand that from a personal and business point of view.