What's healthier for the turbo/engine? Sequential or non-seq?
#1
What's healthier for the turbo/engine? Sequential or non-seq?
This is a wierd question I know but reguarding turbo life .
would the turbos take less abuse if it were in none sequential , during cruising rpms . IE 3500 rpms both turbos spinning , VS having only the primary spinning ?
with both turbos theoretically spinning at lower RPMS , and pushing more air compared to having only 1 turbo having all the flow directed at it to cope with the load.
ofcourse we're talking in light load vacume situation , where the turbos arent really spinning all that much . but still spinning .
strictly theoretically
my question kind of originates from vacume I have my secondary turbo come online at 4k rpms , when cruising at 3800 my vacume is less then when it passes the 4k rpm threshhold which it then gives me move vacume when the secondary turbo opens up .
So I was curious if cruising with both turbos online would be a good thing or a bad thing .
would the turbos take less abuse if it were in none sequential , during cruising rpms . IE 3500 rpms both turbos spinning , VS having only the primary spinning ?
with both turbos theoretically spinning at lower RPMS , and pushing more air compared to having only 1 turbo having all the flow directed at it to cope with the load.
ofcourse we're talking in light load vacume situation , where the turbos arent really spinning all that much . but still spinning .
strictly theoretically
my question kind of originates from vacume I have my secondary turbo come online at 4k rpms , when cruising at 3800 my vacume is less then when it passes the 4k rpm threshhold which it then gives me move vacume when the secondary turbo opens up .
So I was curious if cruising with both turbos online would be a good thing or a bad thing .
#2
just dont care.
iTrader: (6)
i think running fully non-sequential would be better for engine longevity simply because you're removing (or wiring open) the big exhaust flapper that redirects the exhaust flow to the primary turbo for 99% of your driving.
running non-sequential lowers EGTs and runs both turbos all the time, which i would say keeps the heat down and both turbos working less overall (as compared to utilizing the flapper retaining heat, and one turbo doing 99% of the work).
running non-sequential lowers EGTs and runs both turbos all the time, which i would say keeps the heat down and both turbos working less overall (as compared to utilizing the flapper retaining heat, and one turbo doing 99% of the work).
#4
just dont care.
iTrader: (6)
i dont think there's going to be much competition from the other side of the "fence," as it's just physics. removing (or even wiring open) that exhaust flapper is going to let more heat flow through the turbine wheels (and ultimately out of the downpipe) and split the exhaust load to two turbos. as far as reliablity and heat is concered, there's no downside.
the downside is lag.
the downside is lag.
#6
All out Track Freak!
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The engine is designed for sequential twins and handles the abuse they give it fine it's when fools add a straight exhaust and boost the thing to 14 psi that hurts the engine.
Hell if you want what is best for the engine just take the turbo off
However what's best for the driver is a sequential twins
Hell if you want what is best for the engine just take the turbo off
However what's best for the driver is a sequential twins
#7
rotorhead
iTrader: (3)
would the turbos take less abuse if it were in none sequential , during cruising rpms . IE 3500 rpms both turbos spinning , VS having only the primary spinning ?
with both turbos theoretically spinning at lower RPMS , and pushing more air compared to having only 1 turbo having all the flow directed at it to cope with the load.
ofcourse we're talking in light load vacume situation , where the turbos arent really spinning all that much . but still spinning .
with both turbos theoretically spinning at lower RPMS , and pushing more air compared to having only 1 turbo having all the flow directed at it to cope with the load.
ofcourse we're talking in light load vacume situation , where the turbos arent really spinning all that much . but still spinning .
Now what you have to consider is that with a "poor man's nonsequential," you need to use the engine more to spool up two turbos rather than one. There has to be exhaust-derived power to turn both turbine wheels enough to make boost. I can see at certain points you might be generating a bunch of extra heat to spool two turbos rather than one. That could degrade turbo life by heating up the oil, turbine housing, bearings, etc.
Without a gazillion sensors all over the engine bay it's just speculation though.
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