turbo concept...will it even work??

[ja_ka24det]

ok....
so as alot of you know, turbos are great for effeicently making huge amounts of horse power. as alot of you more involved with turbo technology also know that bigger tubo = bigger power but longer spool up time and most of the time not reaching full boost until almost redline. Smaller turbos spool faster giving you fast almost off idle response but with smaller horse power figures.

now my question is this...
i know there are twin turbo setups on all sorts of cars (supra) what i wanna know is....
rather than running the turbos both into the intercool and down the hatch of the engine, would it be possible to have a small turbo mounted right off the exhaust manifold, then run it perpendicular to other turbo, namely a much larger (for high horse power) turbo??
i was just thinking that turbos are powered by exhaust gas, what would happen if someone used the psi (much greater than amount of p.s.i. exhasut creates) generated from a small turbo, to power and over all spool a whopping a huge turbo quickly...

[slideways...]

if im thinking what your thinking, its just using one turbo off the manifold, then use the intake air spooled by that turbo thru the turbine side of the big turbo.

there would be no point. the small turbo would run out of breath before the big turbo can spool fast enough to make more boost and just become a restriction. while it would cause the big turbo to spool faster, the hp limit would be around what the small turbos limit is. so why not just use the small turbo...

[stang805]

twin sequencial turbos, thats how mazda made the 13b a 245hp monster, still lower boost levels because of smaller turbos but twice the cfm (just as important as boost) your idea is creative but i'm gonna have to agree with slideways.

[GR8BRYT]

Yea, sequential turbos use a principle similar to what your're describing. The small turbo spools and feeds the larger turbo to spool. You would have to find a way to create some type of bypass valve so that when the larger turbo is spinning in its ideal operating range, the small turbo could be eliminated and the pressurized air could just go straight to the bigger one. To make this idea work, I don't think you would be able to use a single exh. manifold.

[ja_ka24det]

yeah im not seriously plannning on running this setup....i just though it was a different idea compared to everything else ive seen. this was just a hypothetical question if we were in the perfect world (unlimited time, resorces, money). thanks for your input guys

[TerminalVelocity]

heat also plays a part in the spool....

[sv650s]

i think a biturbo is exactly what you're thinking, two sequential turbochargers right next to each other...i think that's what a 911 turbo uses

[David_NISMO]

The FD Twin Turbo RX-7 and the Twin Turbo Supra used the Sequential Setup

Funny thing is with turbo technology advancing as far as it has in the past 10 years, sequential turbo setups have become outdated. Technology has allowed for the perfect matching of turbos to specific motors and application. Turbo's themselves have become MUCH more efficient with lower spool times. Squentials are inherently overcomplex and in the end the smaller turbo used for quick spools just gets in the way of making good HP.

My friend just sealed off the sequential setup on his FD, keeping the stock twins. He removed 47 vacuum lines whose sole purpose was to control the sequential timing!!!!

To expound on what a Sequential setup is. One Manifold feeds One small turbo who's entire exhaust gases feed the Larger one. Controlling this setup is not something most desire to understand

[nismo_pilot]

two turbos in line with each other, one manifold feeds both snails, the exhaust flow travels through the small turbo producing boost at low rpms, at a given psi rating the exhaust flow is wastegated around the small turbo into the larger one, during small turbo operation the exhaust flow is still flowing through the large turbine to start the spooling of it, given some calibration for turbo sizes and engine speeds you could see some ridiculous numbers at unseen places in the powerband