str8wick3d

http://www.youtube.com/watch?v=VlCzEOuIlJY

His Rpms drop so fast, It sounds so clean. Is it the NSR stage 2s, or the ud pulleys, or what?!? I want my car to rev like that. Or maybe its cause his car isn't warmed up in the video.

whyask

think cause hes RUNNING NO EXHAUST .. no back pressure AT ALL ..ANYWERE will probly do that!

distantsoldier

I would go with the no exhaust thing as well...but the under drive pullies would help because it drops the weight of the rotating mass.

liberty911

Why do people rev motors cold and then videotape their stupidity? Albeit this person only went to 5k rpms.

soon2bu

Hah. Anything above 3k should be a no-no.

And don't get me wrong, I love the sound, but I wouldn't consider that "clean"." It also sounds if its echoing, so it might be in a garage.

distantsoldier

well...recent studies are saying that it doesn't really hurt the engine to rev them cold as long as you're not redlining and holding them. They are built to be able to be crunk able and driven away, heat up faster and run harder. They are much better built then yesteryear engines...

Cal26Stang

no muffs

GT Premi

Unless his tach isn't working properly, it doesn't appear to be dropping any faster than normal. It just "sounds" like it's dropping really fast.

thewarmachine

There is nothing wrong with revving the car cold. I received a Ford magazine recently in which a Ford engineer said a gasoline engine has full lubrication 5 seconds after ignition.

Norm Peterson

Having full lubrication is one thing.

Not creating lots of differential expansion between parts that have been fit to small clearances is something else again.


OP - a light flywheel and clutch assembly will allow an engine to spool down quickly (less rotational inertia trying to hold the revs up).

So will greater backpressure than normal, rather than less (where do you think the energy to pump against the greater backpressure would come from?).


Norm