twin scroll compressor map anyone???
No problem. You should thank http://www.forcedperformance.net however. 
actually this is for the TME 6.5 turbo...same size, but it has a Ti shaft and will have a slightly different map. I can use this as a generalization....but do you have the stock turbo map?
you would be at hero^2 status
you would be at hero^2 status
The compressor map would not be altered due to the Ti parts. At least that makes sense to me.
The efficency rating for those "islands" would not be affected in any way as the compressor wheel is the same. Therefor it'll flow, heat and pressurize the same ammount of air at a given shaft speed.
It's ability to spool slightly sooner would not affect the compressor map.
The efficency rating for those "islands" would not be affected in any way as the compressor wheel is the same. Therefor it'll flow, heat and pressurize the same ammount of air at a given shaft speed.
It's ability to spool slightly sooner would not affect the compressor map.
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Originally Posted by JustDSM
The compressor map would not be altered due to the Ti parts. At least that makes sense to me.
The efficency rating for those "islands" would not be affected in any way as the compressor wheel is the same. Therefor it'll flow, heat and pressurize the same ammount of air at a given shaft speed.
It's ability to spool slightly sooner would not affect the compressor map.
The efficency rating for those "islands" would not be affected in any way as the compressor wheel is the same. Therefor it'll flow, heat and pressurize the same ammount of air at a given shaft speed.
It's ability to spool slightly sooner would not affect the compressor map.
Originally Posted by JustDSM
The map wouldnt shift at all. You'd just "accelerate" through certain points quicker due to the reduced rotational mass. That would not alter the position on the map.
hmmm... "your ideas intrigue me, and I'd like to subscribe to your newsletter"~homer
i understand what you're saying... I'll have to think about that some more
the part that's hanging me up on this one, is that if the turbine wheel is accelerating at a faster rate, a higher boost pressure can be achieved at a lower rpm, thus having a lower vaf (x axis) vs. the same PR (y axis) causing a shift to the left.
and this is the part I'm still trying to visualize...that function for increaced shaft acceleration, would carry on through the rest of the turbo's rpm band and i could see how the whole graph would almost pivot on the 0,0 point and rotate a few degrees counter-clockwise as well...
any of the above make sense?
Originally Posted by koolade9
hmmm... "your ideas intrigue me, and I'd like to subscribe to your newsletter"~homer
i understand what you're saying... I'll have to think about that some more
the part that's hanging me up on this one, is that if the turbine wheel is accelerating at a faster rate, a higher boost pressure can be achieved at a lower rpm, thus having a lower vaf (x axis) vs. the same PR (y axis) causing a shift to the left.
and this is the part I'm still trying to visualize...that function for increaced shaft acceleration, would carry on through the rest of the turbo's rpm band and i could see how the whole graph would almost pivot on the 0,0 point and rotate a few degrees counter-clockwise as well...
any of the above make sense?
i understand what you're saying... I'll have to think about that some more
the part that's hanging me up on this one, is that if the turbine wheel is accelerating at a faster rate, a higher boost pressure can be achieved at a lower rpm, thus having a lower vaf (x axis) vs. the same PR (y axis) causing a shift to the left.
and this is the part I'm still trying to visualize...that function for increaced shaft acceleration, would carry on through the rest of the turbo's rpm band and i could see how the whole graph would almost pivot on the 0,0 point and rotate a few degrees counter-clockwise as well...
any of the above make sense?
If you put that turbo on a 6.0 liter V-8 engine you would have instantaneous spool up.... but the graph would be identical to the one we have.
If you put the same turbo on a 125cc mini bike engine it wouldn't spool past 5 psi no matter how hard you tried.... but the graph shown for the compressor efficiancy would be identical to the one we have.
Nothing you do changes the compressor map other than changes to the compressor housing, or the wheel itself.
What YOU are thinking of it that with a faster spool up you are at a different point on the compressor map than you would be on a slow spooling turbo with the same compressor wheel. If you plotted a line on the map for where your actuall turbo is operating from spool up to redline on your engine with the stock exhaust wheel and then with the titanium exhast wheel then the second line you plotted would be slightly to the left of the first line until the turbo reached full boost, then the lines would join together. But the map itself would be identical.
Keith
Last edited by Fourdoor; Dec 21, 2004 at 04:36 AM.
