Hello Tom, Interesting. I think another factor into this equation is that a turbo doesnt just pump a fixed volume of air, but is regulated by the wastegate as well, though I can see your point. Pauls example would seem to back you up on this as well.
Saturday, July 27, 2002, 5:21:07 PM, you wrote: TR> Bob, TR> Good point, however, in an automotive induction system, the point of TR> lowest pressure is actually the point where all the air is exiting the TR> system- the inlet runners. In a system of constant volume, the pressure TR> would be double, as the number of molecules would double due to two TR> pumps instead of one (ideal gas law: PV=nRT) However this only applies TR> to closed systems, so in this case where there is a pressure drop in the TR> system (the throttlebody) the best explanation I can come up with (since TR> I don't have a physics degree) is to approximate it somewhere between TR> the same pressure and double the pressure! Things like turbo efficiency TR> and dynamics would come into it.. so twin turbos on 10psi each at TR> constant rpm would be about 16psi....or something... I think....! TR> - Tom TR> Bob wrote: >>I think you would find that the pressure from the turbos is not going >>to add together to give twice the boost. If this were the case, in the >>piping leading from each of the turbos you would see 10psi, and in the >>plenum you would see 20psi. Liquids/gasses always try to flow from >>high pressure to low pressure points, so the air would then be trying >>to flow back from the plenum to the turbos if that were the case. >> >>As I understand it there are basically two types of twin turbo setups >>used on cars, one where you have two smaller turbos of the same size >>which should spool up identically etc and not have the syncronisation >>problem, which allows you to use small turbos to get less lag without >>as much restriction at the top end, and the second type like on late >>model 13Bs where it has a small turbo to cover the bottom end, and a >>big turbo for the top end. I read a report once where the engineers >>were commenting on the setup of it, apparently its a real bitch to get >>right. >> >>Saturday, July 27, 2002, 12:00:19 PM, you wrote: >> >>DA> Ummm, correct me if i'm wrong Mark, but the only time one turbo shitting >>DA> itself would cause diff intake into those two cylinders would be if you >>DA> were running two separate intake manifolds yes? If both turbos go to the >>DA> one intercooler, then to a single throttle body, single plenum, and into >>DA> all 4 you shouldn't have that problem. >> >>DA> Oh and two turbos at 10 psi is 20 psi the engine would see. To get 10 psi >>DA> out of a twin setup you'd only need each to be at 5 psi. Is this correct? >>DA> Regards, >> >>DA> Dave >> >> >> >>>>>>>>>>>>>>>>>>>>>Original Message <<<<<<<<<<<<<<<<<< >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> >> >>DA> On 7/27/02, 10:42:22 AM, "Paul Stanley" <[EMAIL PROTECTED]> wrote regarding >>DA> Re: please explainnnnnnnnnn.......: >> >> >> >> >>>>If syncronisation is a problem what about a custom turbo with seperate >>>>turbines all connected to the one shaft? Is that possible? While you're >>>> >>>> >>DA> at >> >> >>>>it... you could go the whole hog and make it a quad turbo. >>>> >>>> >> >> >> >> >>>>From: Paul Stanley >>>> [EMAIL PROTECTED] >>>> >>>> >> >> >> >> >> >>>>----- Original Message ----- >>>>From: Rick White <[EMAIL PROTECTED]> >>>>To: <[EMAIL PROTECTED]> >>>>Sent: Saturday, July 27, 2002 2:33 AM >>>>Subject: Re: please explainnnnnnnnnn....... >>>> >>>> >> >> >> >> >>>>>Mark. >>>>>I could maybee se a problem with having one per two cylinders. >>>>>if one decides to shit itself one half of the engine would get totally >>>>> >>>>> >>>>different air fuel ratios and maybee the whole thing going bang big time. >>>> >>>> >>>>>Like half of the engine would like kinda stall and the other half would >>>>> >>>>> >>DA> be >> >> >>>>fueled and boosted up big time so the half with the dead turbo would >>>>probably lean out?? >>>> >>>> >>>>>I recon one turbo is enough of a worry with out adding another to the >>>>> >>>>> >>>>equasion. >>>> >>>> >>>>>But two spooling up to ten psi would happen quicker with only half the >>>>> >>>>> >>>>induction needed so you would be really getting like maybee 18maybee psi >>>> >>>> >>DA> in >> >> >>>>real terms? >>>> >>>> >>>>>Just my thinking really. >>>>>maybee I am way off track here. dunno. >>>>>Later mate. >>>>>Rick White. >>>>> >>>>> >>>>>--- "mark krawczuk" <[EMAIL PROTECTED]> wrote: >>>>> >>>>> >>>>>>hi, if you have a single turbo at 10 psi, feeding 4 cyls, would it >>>>>> >>>>>> >>>>go >>>> >>>> >>>>>>better/or what would happen if you have two turbos at 10 psi, with each >>>>>>turbo feeding 2 cyls? >>>>>> >>>>>>i was fairly ,sorta on the track explaining to my bro, but then he said >>>>>>amongst other stuff, that he cant see any reason why two are better than >>>>>>one..... >>>>>> >>>>>>mark k >>>>>> >>>>>> >>>>>> >>>>>_____________________________________________________________ >>>>>Get Your free Ozdat Email Account >>>>>---> http://www.ozdat.com >>>>> >>>>>_____________________________________________________________ >>>>>Promote your group and strengthen ties to your members with >>>>> >>>>> >>>>[EMAIL PROTECTED] by Everyone.net http://www.everyone.net/?btn=tag >>>> >>>> >>>>> >>>>> >> >> >> >> >> >> >> >> -- Best regards, Bob mailto:[EMAIL PROTECTED] --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
