[s-cars] Two Words

[JShadzi at aol.com]

>Javad, all we need now is your car's manifold inlet temperature
>vs. the UrQ's inlet temperature at 15 psi, right?

Yes, but from what I know they were both reasonably withing 80 degrees or so.

>As I try to visualize all this, its not simply "pressure" and flow, but
>rather the temperature of that flow that distinguishes your 80Q's 15 psi vs.
>the UrQ's 15 psi.  My guess would be volumetrically, at 15 psi, they are
>both pushing roughly the same cfm of intake air, one just happens to be 15%
>~ 20+% heavier, or "thicker" or denser than the other.

Yes, temperature and efficiency are part of the equation, with higher temps flow is less as you say, less dense air equals less air.  In the Urq example, and even RS2 for that matter, both have much better flowing systems however, from the inlet all the way to the exhaust.

For example, my 80 not only has the CIS yanked but has a better flowing intake system, bigger IC, very free flowing header and much better flowing exh. than the Urq.  While the Urq isn't being helped by a K24 running at the top of its efficiency range, it also is doing so thorugh a more restrictive intake and exh. system, part of which includes the small K24 AR ratio.

Wish I could say how much of the difference is temp. releated and how much is pure flow related, but that gets into some quite complex testing as you can imagine.

>You were running what kind of turbo at the time?

T3/T4 hybrid, .63 turbine AR and 50 trim compressor.  Much bigger turbo than a K24

>How would you say your Intercooler compares to the UrQ's?

About 75% bigger?  RS2 sized.

Javad