ok guys - heres a real life example for you ! we have an rb20 motor with two of the original turbos fitted as a twin turbo setup both turbos with the original intregal wastegates - with no mods to the wastegates it runs aprox ten pounds boost - std single they run approx 8 pounds boost - so slight increase but marginal ! by the way on 18 pounds it creates 400 rear wheel horsepower ! ----- Original Message ----- From: "Tom Richardson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, July 27, 2002 5:21 PM Subject: Re: please explainnnnnnnnnn.......
> Bob, > > Good point, however, in an automotive induction system, the point of > lowest pressure is actually the point where all the air is exiting the > system- the inlet runners. In a system of constant volume, the pressure > would be double, as the number of molecules would double due to two > pumps instead of one (ideal gas law: PV=nRT) However this only applies > to closed systems, so in this case where there is a pressure drop in the > system (the throttlebody) the best explanation I can come up with (since > I don't have a physics degree) is to approximate it somewhere between > the same pressure and double the pressure! Things like turbo efficiency > and dynamics would come into it.. so twin turbos on 10psi each at > constant rpm would be about 16psi....or something... I think....! > > - Tom > > > > 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 > >>> > >>> > >>>> > >>>> > > > > > > > > > > > > > > > > > > > --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]/ ---------------------------------------------------------------------
