deleted_user_160
So as spac is selling ATM. Quad throttle body for red blocks. Or any other set up that is.
Can the experts give me/is the run down, yays, nays, pros/cons etc.
Vee_Que
Not really for a turbo motor. Great na though. Gains turbod need to be matched with a lot more work. It is forcing air afterall.
Spac
In general terms: Standard single TB intakes can be restrictive and/or have poorly matched tuned lengths on the intake runners.
It is entirely possible to build a single throttle body intake that works as well as ITBs*, but its more work and there are traps like having cylinders 'stealing' airflow from other cylinders, rather than drawing more air in.
Individual Throttle Bodies are an easy solution to all of those problems. The length is relatively easy to modify, and you can minimise restriction. They work best with a (large) plenum on them, just like a single TB set-up, but its a seperate and relatively easy to tune thing.
ITBs also provide slightly sharper throttle response compared to even a good STB set-up, but few people would ever notice it.
They also sound cool...
*Modern performance oriented cars generally have very good intakes on them. Unlike an old Volvo intake, the runner lengths are generally good, they're not restrictive, and they have big plenums - some are very difficult to improve on, unless you have significantly changed the rev range that the motor operates in.
egads (she/her)
Sound cool is where it is at :-D
deleted_user_160
Hehehe. Figured turbo applications would have much effect.
The busa set up you had spac, do they run indipendent or all controlled the same?
Vee_Que
GTR skylines with rb26s use them. As did Gtir pulsars with sr20s. Most people don't touch them for 200sxs though. Which says a lot about them I guess..
deleted_user_160
Because there is no real need for majority of applications? Or because of the expense and screwing about?
Spac
Turbo cars aren't as dependent on good intake manifold design to get good power - turbos DO benefit from a good intake, but they can still easily make good power with a compromised intake.
One of the big reasons that people are anti-ITBs on turbo motors is that the Japanese aftermarket had troubles tuning them in the mid-90s using interceptor ECUs, so the solution was to convert to a single TB. Apart from the hardware deficiencies, there was also a need to rethink the tuning process.
The second big reason is that throttle response on a turbo car is limited more by the turbo and the tune that the location of the throttle butterfly/butterflies. So that benefit of ITBs pretty muc disappears.
ITBs all run in parallel. Staged butterflies only work when you've got multiple butterflies feeding into the one plenum.
deleted_user_160
Awesome thanks. That breaks it down better.
I always like to know why I shouldn't do somethig, as apposed to don't do that, because it's no good.
I like to understand. The more knowledge I have the happier I am.
Does this theory, carry across to diesel applications?
Vee_Que
Diesels dont have a throttle body to start with. And don't Rev. So long big manifolds are the order of the day there even turbo charged.
jonbot
i would still be interested to see what one could do with an n/a diesel and playing with runner lengths
probably not alot in it but itd still sound cool
deleted_user_160
Yeah that's right. That's why they don't require a bov. On a tdi
