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oldcorollas
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Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: PARALLEL Twincharging, lets make it work

Tue, 23 August 2005 14:03

Fr3aK wrote on Tue, 23 August 2005 23:14

If you're wondering how to do this, call Darryl at Screamin Performance.
He's done it on 4AG powered Corolla.
02 4284 6674

done what? series or parallel? how did he do it? what psi are we talking etc? good for him...get him to post his ideas here Very Happy

, or at least find out from him if it was series or parallel, and what order, and where were the control points.

RobertoX, i had the same idea a while ago.. problem is again, that the SC moves fixed amount of air, and turning it off wil cause pressure drop... you could throttle it but then we are back at the same point.. since the wastgate/throttle is acting like a one way valve anyway.

fwiw, i think Berad had a good idea that he _should_ be posting in the series twincharging thread... similar to brett_celicacoupe's idea, but simpler.. possibly the way the nissan march does it...

Nudes,
venting exhaust?? well, it goes into the turbo manifold, tries to spin the massive turbo, and then goes into dump pipe..

the turbo will provide shiteloads more air than the SC, and the turbine is sized bigger than usual for this size engine (ie as a 3L instead of a 1.6) so it will still have top end flow, and only a small wastegate needed..

and i guess the whole point of the SC is to spool the massif turbo... Very Happy

yar, the way to regulate the SC without bleeding off air is to throtle it's intake, but i think that this may actually result in higher losses than if the SC actually pumps the air and it is bled off!!! sonce there will be a higher pressure differential across the SC.. can't throttle the SC output, it will destroy any throttle you put there because of PD.. re-read (one of) my recent earlier posts about the losses with the different ways

MWP, one way valve for SC is effectively on or off due to the PD nature of SC..

NickZ, thats a bloody good point no-one has mentioned..... so if you suddenly close the throttle on an SC, then the force required to turn it suddenly goes up (confirming that it uses more power to turn pulling a vacuum) and kills belts.... hmmmmm

so we DO actualyl need to recirculate air back to the front of the SC, if only to allow it to frewheel to the point where we turn it off....

if T1 is closed but T3 is open (so air is free to get to the SC input) and we turn it off, then the SC can continue to freewheel because there is no pressure differential across it (well, there will since the recirc air is cooler)... maybe the recirc air chould be from hot side (ie before IC) so that when it turns off, there is no temp or pressure differential across SC??

re: turnng SC back on, there would be an elec lockout such that the SC ONLY turns on at a given throttle%.. maybe 20-30%?? so on gearchange when motor slows, SC is off, and probably not still moving fast(tho it might be??) i wonder what rpm is safe for the SC to turn back on?? is it the differential between the pulley and SC speed??

hmm.. maybe series IS the best way to go Razz

regardless, i like the idea of making parallel work....

maybe we can aim for a toymods dyno day in future where we test out turbo, vs series, vs parallel, vs SC12/14, vs lysholm Wink

now THAT would be interesting

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