Riddle me this then. My prime mover is powered by a 12.7 litre Detroit. NO its not a 2 stroke Gemmie, its a 4 stroke series 60. If I have it fully boosted (30psi) AND below 1600rpm and suddelny lift off, it flutters like a bitch! Really big and lound flutter. Sounds like "CHUFF.. chah cha ch". Now, juuust in case, diesels (as a rule) do not have throttle bodies...I had to say that!!!!!! Over to you all you armchair Einsteins. Furthermore, the dude asked a simple question. He didnt ask for YOUR OWN personal opinion on dosing, and on him for that matter, he wants to know HOW to make dose........sheesh! Im an old fart, prolly older than the vast majority on this forum and i happen to like dose. I have no interest in VLt's so shove it! Pffft! L8r E
So where's your back up to support your "Myth" statement? You shoot down someone for doing exactly what you did. I can see that surge surely can't put more stress on the turbo any more than exhaust pushing one way, and air pressure the other way. Turbos only whistle under load as this is also pressure against the impeller same as fluttering or dosing does. I believe that the recircs and BOV's are in place for performance more than prevention. As I mentioned earlier, not having them causes greater lag due to the resistance slowing the turbo down when off throttle. Relieving the pressure out somewhere else reduces that issue giving better response. But I can also see it this way: Theoretically speaking, not having them would effectively double resistance stress on the turbo by not only boosting, but getting off throttle too. Twice the stress would lead to half the life would it not? Obviously this varies by duration frequency of boosting.
The way I see it... The relief/recirc valves are there to remove pressure the impellor/chra/bearings are being subject to. A rest period almost for the Turbocharger. If there is no relief, the bearing will be under constant pressure. This is talking from an anecdotal point of view.. But I suppose it is similar in a way to Systolic/Diastolic blood pressures, like how the heart needs it's rest periods to function for x amount of years. Nothing lasts forever, and if you're doubling the amount of work something has to do, it's only going to last a maximum of 1/2 as long before it wears out/reaches failure.
Seeing as cru1ser's computer is obviously broken, I will ask this on his behalf. Kindly provide test data and further empirical evidence of your ludicrous claim re "Extensive testing"(with particular emphasis on the qualifications of the testing authority that undertook this investigation).:zlove:
A continuously variable valve such as the Throttle Valve(throttle bodies)or one that can be set to "flap open" at a predetermined pressure or flow(not a poppet valve type).:br:
i dunno if a Z will sound any good with the "flutter", but i would assume it would be the same as dosing a VLt, i just drove my collegue home... every time i hit high revs he made the dosing sound hahah
certainly an interesting thread ...... i remember, way back, when "getting a dose" meant something quite different ... eekkkk !!
I have it under good authority and reliable fact that saying "extensive testing" before your argument makes it sound much more official and certainly applicable to any instance where it can be argued differently.
maybe and while I dont care if he wants his car to dose (after all I am one of those pro Veilside guys) look at the other responses and how quick they came through.
I've been looking for a copy of the tests tha were done by a forum member on another forum (also a reputable tuner and engine builder). I can't find it now but it's not like I'd make it up. It's always a contentious issue but I know that I'd happily run a car without BOV's with peace of mind.
To add to this, it has no throttle plate as stated, no bov, no wastegate (depending on model), only a 270* thrust, sleeve bearing turbo. Now, why does it have hectic flutters? And why does it not explode from said flutters? (these turbos spin at 70,000rpm at full boost and have approx 6 times the rotating mass of a T28 and is also covered by a 500,000km warranty, 1,000,000 if it is a Cummins) So what are the answers???
