My "sort of friend" who owns a shop in south SF was telling me that turbochargers do in fact need some backpressure to spool up, something about requiring heat to make power... Honestly I couldnt make much sense of it... But basically the overall message being that running a qtec exhaust cutout as I plan to do will hurt me massively on the low end/lower rpm's BECAUSE the turbo needs some backpressure in order to spool. Conversely, he said that upgrading to a 3" downpipe would be very beneficial... =0
FYI, I'm capping things off with a GSX muffler this afternoon. Need the car to look as stock as possible...and sound a bit tamer. Long term plans were to add an electric cutout so that at least some of the time I can have loud obnoxious exhaust... But... if my turbocharger takes forever to spool with the exhaust opened up, what good does it do other than ... be obnoxious and loud?
#66280, "RE: How crucial is backpressure?" In response to Reply # 0
Originally posted by GhEttOrAiD My "sort of friend" who owns a shop in south SF was telling me that turbochargers do in fact need some backpressure to spool up, something about requiring heat to make power... Honestly I couldnt make much sense of it... But basically the overall message being that running a qtec exhaust cutout as I plan to do will hurt me massively on the low end/lower rpm's BECAUSE the turbo needs some backpressure in order to spool.
My advice would be to stop listening to that guy because he does not know what he is talking about.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#66284, "RE: How crucial is backpressure?" In response to Reply # 2
Originally posted by DarkOne
Originally posted by GhEttOrAiD My "sort of friend" who owns a shop in south SF was telling me that turbochargers do in fact need some backpressure to spool up, something about requiring heat to make power... Honestly I couldnt make much sense of it... But basically the overall message being that running a qtec exhaust cutout as I plan to do will hurt me massively on the low end/lower rpm's BECAUSE the turbo needs some backpressure in order to spool.
My advice would be to stop listening to that guy because he does not know what he is talking about.
#66283, "RE: How crucial is backpressure?" In response to Reply # 0
Originally posted by GhEttOrAiD My "sort of friend" who owns a shop in south SF was telling me that turbochargers do in fact need some backpressure to spool up, something about requiring heat to make power...
turbos spool up due to a pressure differential. Therefore, more backpressure = less pressure differential = slower spool.
#66285, "RE: How crucial is backpressure?" In response to Reply # 4
Originally posted by mkerley
Originally posted by GhEttOrAiD My "sort of friend" who owns a shop in south SF was telling me that turbochargers do in fact need some backpressure to spool up, something about requiring heat to make power...
turbos spool up due to a pressure differential. Therefore, more backpressure = less pressure differential = slower spool.
#66286, "RE: How crucial is backpressure?" In response to Reply # 5
they have back pressure sensors you can use to test what certain sections of your exhaust are restricted.....
reducing back pressure directly increases exhaust flo, i.e- thats why a 3inch downpipe directly effects spool time. _________ 96 talon esi-t san clemente, ca
as needles of ice are the ill winds' talons the coldest of shadows they seep unto the bone
#66289, "RE: How crucial is backpressure?" In response to Reply # 6
discussing thermal exhaust gas dynamics and maximum air velocities in relation to pulse and volume will be a long discussion... Just to make it simple, tell him that he should not be telling you info he knows nothing about..
-------------------------------------- know me as santiago boosted 420a and ej2o..(my 2liter v8 eaters)
#66329, "RE: How crucial is backpressure?" In response to Reply # 10
Originally posted by thedawg Although you'll find if you *ahem* one day accidentally lose your exhaust system.... your fuel trims will go apeshit and the car won't run too well doh
That's because you need an O2 sensor... even if you dont want an exhaust... haha.
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