Axle Back Question - Toyota Yaris Forums

Kaotic Lazagna · 12-22-2008, 04:21 AM

Back pressure is a bad thing, better exhaust velocity is a good thing. I think you might have used the wrong term.

_S7V7N_ · 12-22-2008, 10:45 AM

cool deal thanks for the feedback guys.

mastaofdisasta · 12-26-2008, 11:39 PM

Quote:

Originally Posted by Kaotic Lazagna

Back pressure is a bad thing, better exhaust velocity is a good thing. I think you might have used the wrong term.

from what i heard...or rather what i was told is that backpressure can be a good thing and that engines do need a certain bit to perform optimally. Now dont quote me on this and i could be wrong...but going with larger exhaust on bigger v8 v6 engines is fine, or turboed supercharged engines, but on engines like ours, i think losing backpressure can actually be not good, therefore backpressure can be a good thing?

thebarber · 12-27-2008, 08:26 AM

Quote:

Originally Posted by mastaofdisasta

from what i heard...or rather what i was told is that backpressure can be a good thing and that engines do need a certain bit to perform optimally. Now dont quote me on this and i could be wrong...but going with larger exhaust on bigger v8 v6 engines is fine, or turboed supercharged engines, but on engines like ours, i think losing backpressure can actually be not good, therefore backpressure can be a good thing?

naturally aspirated engines can still benefit from an increase in exhaust pipe diameter as they are typically made conservatively small from the factory. yaris is 1.75" stock and i cant see any problems w/ going up to 2"....2.25" might be ok too, but id lean towards 2", personally.

Kaotic Lazagna · 12-29-2008, 11:15 PM

Quote:

Originally Posted by mastaofdisasta

from what i heard...or rather what i was told is that backpressure can be a good thing and that engines do need a certain bit to perform optimally. Now dont quote me on this and i could be wrong...but going with larger exhaust on bigger v8 v6 engines is fine, or turboed supercharged engines, but on engines like ours, i think losing backpressure can actually be not good, therefore backpressure can be a good thing?

Might be true, but a small increase in piping diameter should help rather than hinder the performance.

12-22-2008, 10:45 AM	#2
_S7V7N_ Drives: Yaris 4 Door Sedan Join Date: Dec 2008 Location: South Texas Posts: 805	cool deal thanks for the feedback guys. __________________ Audio is under Construction Kenwood KDC-X794 Hifonics Zeus ZXI6.5C 6.5-Inch 2-Way Component Speaker System - AUTOTEK ATX65CX 6.5-Inch Hifonics BXi 1210D - Crunch PowerZone P1400.4 (2)12 inch Kicker CVR's - 0 gauge from battery to Distribution block - 4 Gauge Power/Grounds to amps - Duralast Yellow Top - Big 3

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12-22-2008, 04:21 AM	#1
Kaotic Lazagna View User's Garage Drives: '14 GT86, '08 Vitz Join Date: Dec 2006 Location: Central Valley, CA Posts: 9,873	Back pressure is a bad thing, better exhaust velocity is a good thing. I think you might have used the wrong term.