Originally Posted by foreigneRS
how much air is there in the intake system (that means between the compressor and the closed throttle plate), on for example a t3 equipped cossie with 4x4 intercooler running at 15 psi and then closing the throttle?
how much more air is there with the same car but at 30 psi?
i cant say figures for that, it would be needed to calculate. but amount of airmass, isnt so big of a deal, than velocity and pressure. high pressure usually makes hi velocity. and you know that when you calculate force, the velocity means more than mass. but on bigger boost, the masses are bigger too.
Originally Posted by foreigneRS
how much air is the engine consuming past the 'closed' throttle plate when changing gear and the revs are dropping from 6000 rpm?
how much air does that leave to 'rush' back out of the inlet past the compressor and do all of this damage?
again, i dont know figures on that, it would be needed to calculate. but amount isnt so much. even in DV, you could have too small DV, and therefore still have schatter.
Originally Posted by foreigneRS
how easy is it for the air to escape out past the compressor? it's not like a positive displacement compressor, it's just a fan.
why does air need to go past compressor? sorry, but i dont understand what are you meaning whit this question? that air will go to compressor wheel, and compressor wheel pushes air back to that throttle plate, and back again to compressor wheel.
Originally Posted by foreigneRS
have you ever blown across the top of a bottle? you get a noise, right? but is any damage being done to the bottle?
put your bottle on a pedestal, exactly in the middle so that its in perfectly in balance. make that pedestal spin for 100000rpm and the blow to the bottle. the blow dont brake that bottle, but that blow will make that bottle be inbalace, and it will be thrown of from the pedestal. now try same again, and put on some wings to it, like in compressor wheel.
that air itself dont damage your turbo, damage will occure BECAUSE of air.
Originally Posted by foreigneRS
i am not saying that you're wrong, but consider some points.
incidentally, i run a t3 at 22 psi without d/v. i was watching a tv programme last night called 'greatest rally cars' showing the 3 door cossie when first rallying. these were also running 22 psi without d/v as you coud hear. i know that they do not have the same concers regarding longevity as a road car, but if there was any chance that the turbo would be broken on a rally, i believe that they would not do it.
yes, i know what you mean. but like you say, the longevity isnt factor in rally, if it just last for that one rally. thats why they can use anti lag system as well. anti lag will broke your turbo too, but in rally, it will last long enough. same as whit chatter.