rs4 v8 twin turbo?

[sonny]

Hi there! I own the supercharged rs4 that was done by Mrc and it totally transforms the car I looked into tt and I spoke to doug about it and his honest opinion was it's too much of a pita to do I know there's a guy in the states doing some r and d on a kit at the moment! Stay tuned for the final results on my car as it still isn't finished but i reckon we may hit 550bhp and around 675nms of torque or so

Thats some good figures, have you looked into changing the airbox with the S/C?

[ArthurPE]

if it could be done, it would have been done by now...it hasn't been done...
people are doing 50k mods all the time: and yet, no TT for the RS4

to get 800 crank HP with turbo's would take ~ (800/414 x 14.7 / 0.8 ) - 14.7 ~ 21 psi of boost...
on a sc'ed car even more, maybe 29 psi or so
the engine will fail in short order

effective turbo compression ratio ~ (21 + 14.7)/14.7 x 12.5 > 30:1
sc ~ 37:1

on 93 oct pump gas?

not for very long, lol
won't be the first car to frag on the dyno....

[S4Player]

Hey sonny the airbox has been taken out my cars got a huge itg filter on it

[Doug_S2]

Buy an RS4, build a V8 RS6 Engine like this: http://www.youtube.com/watch?v=1M-37ED5oMY

It will need the bulkhead cut and modified.

And you will have what you want.

[adsgreen]

if it could be done, it would have been done by now...it hasn't been done...
people are doing 50k mods all the time: and yet, no TT for the RS4

to get 800 crank HP with turbo's would take ~ (800/414 x 14.7 / 0.8 ) - 14.7 ~ 21 psi of boost...
on a sc'ed car even more, maybe 29 psi or so
the engine will fail in short order

effective turbo compression ratio ~ (21 + 14.7)/14.7 x 12.5 > 30:1
sc ~ 37:1

on 93 oct pump gas?

not for very long, lol
won't be the first car to frag on the dyno....

Whats the 0.8?

Anyway I hate the term boost. You can increase boost by fitting smaller valves or narrower intake manifold. You can get more performance with lower boost if you do it properly

[sonny]

Hey sonny the airbox has been taken out my cars got a huge itg filter on it

Any pictures?

[ArthurPE]

call it what you like: boost, manifold pressure, pressure ratio
all the same...artificially inflating atm pressure

turbos have a high end eff of ~80%
sc's ~65%
obviously depending on type, sizing, etc., Roots, centrifugal, etc.
parasitic losses, thermal efficiency, etc.

and you get higher output with higher 'boost' for a given engine...

obviously if you increase volumetric efficiency (that's all forced induction does, 1 atm ~1, 2 atm, ie, 1 atm boost, ~2) you will get more power for a given boost since Q increases...and there is a point where increasing vol eff will allow a slight reduction in boost and allow the same power (Q or better Q x density ~ mass flow) to be produced...

by introducing restrictions you don't really increase boost, but back pressure/pressure drop...resulting in less mass flow
so with boost control, manifiold will be the same, say 10 psi, but Q will decrease, and with it, power...

but all restrictions are moot compared to the throttle, the actual flow control device

Whats the 0.8?

Anyway I hate the term boost. You can increase boost by fitting smaller valves or narrower intake manifold. You can get more performance with lower boost if you do it properly