[Z06] Put the FUSE back in!
11-06-2005, 11:36 PM
#1
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Put the FUSE back in!
Took out the fuse for a few weeks, immediately noticed a significant difference in low end power.
So i decided to put it back in.
Guess i'm going to hold off for a few weeks until Corsa release their new exhaust.
Looks impressive.
Gary
So i decided to put it back in.
Guess i'm going to hold off for a few weeks until Corsa release their new exhaust.
Looks impressive.
Gary
11-07-2005, 12:17 AM
#2
Burning Brakes
Member Since: Oct 2005
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im just curious, why would that happen? if the exhaust is less restrictive then shouldnt it give more power? if i am wrong on this, or mistaken on the situation, please fill me in.
11-07-2005, 01:06 AM
#3
Racer
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Location: Los Angeles Ca
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Originally Posted by '86VetteHead
im just curious, why would that happen? if the exhaust is less restrictive then shouldnt it give more power? if i am wrong on this, or mistaken on the situation, please fill me in.
11-07-2005, 01:43 AM
#5
Le Mans Master
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St. Jude '03-'04-'05-'06
Originally Posted by 2006Z06
I actually noticed better acceleration and it revs faster. Just my opinion.
11-07-2005, 02:15 AM
#6
Safety Car
Originally Posted by gary501
Took out the fuse for a few weeks, immediately noticed a significant difference in low end power.
So i decided to put it back in.
Guess i'm going to hold off for a few weeks until Corsa release their new exhaust.
Looks impressive.
Gary
So i decided to put it back in.
Guess i'm going to hold off for a few weeks until Corsa release their new exhaust.
Looks impressive.
Gary
11-07-2005, 02:59 AM
#7
Originally Posted by dgussin1
cars need backpressure...period...not enough backpressure will kill low end power and slightly increase top end.
Choaking off the exhaust will NOT increase TQ. It will decrease it. Look at the numbers LG posted. A larger down tube and headers INCREASED TQ a lot. As a percentage basis, I think the LG's headers and long tubes increased the torque more than HP. I could be wrong about that, but that's what I would expect because the engine is so "choked off" to LOWER the TQ. This way, less drivers will end up in the ditch and keep the suits happy at GM.
- Bill
11-07-2005, 10:29 AM
#8
Le Mans Master
maybe he is noticing some lost of power just taking it easy around town rather than having it under medium or high load
11-07-2005, 10:59 AM
#10
Le Mans Master
Originally Posted by dgussin1
cars need backpressure...period...not enough backpressure will kill low end power and slightly increase top end.
Firstly, there is no such thing as actual 'back pressure' in an exhaust system, there is a constant series of high and low pressure pulses running around. Backpressure is mearly the average of these pulses, and a rather meaningless average at that.
Secondly, now that headers are much better understood (e.g. measured), we know that the header resonance is responsible for delivering lots of TQ to the rear wheels, but only when the header resonances are made to line up with the cam timings.
Thirdly, the "backpressure" actually improves mid range power, this is a sign that the collector is too short, not that backpressure is doing anything positive.
This is all found in Lingenfelters book "On modifying Small Block Chevys". I suggest you give it a read.
11-07-2005, 11:49 AM
#11
Drifting
Gen II Vipers (and maybe other Gens) use 2.25" exhaust, which seemed so out of place with an 8L. I always thought that was to create more backpressure, resulting in its enormous and early torque. Not true?
11-07-2005, 02:18 PM
#13
Team Owner
Originally Posted by MitchAlsup
While this may have had some minor merit as an argument back in the days of carbuertors and before the days of dynamic pressure measurements in headers (and intakes), it no longer does.
Firstly, there is no such thing as actual 'back pressure' in an exhaust system, there is a constant series of high and low pressure pulses running around. Backpressure is mearly the average of these pulses, and a rather meaningless average at that.
Secondly, now that headers are much better understood (e.g. measured), we know that the header resonance is responsible for delivering lots of TQ to the rear wheels, but only when the header resonances are made to line up with the cam timings.
Thirdly, the "backpressure" actually improves mid range power, this is a sign that the collector is too short, not that backpressure is doing anything positive.
This is all found in Lingenfelters book "On modifying Small Block Chevys". I suggest you give it a read.
Firstly, there is no such thing as actual 'back pressure' in an exhaust system, there is a constant series of high and low pressure pulses running around. Backpressure is mearly the average of these pulses, and a rather meaningless average at that.
Secondly, now that headers are much better understood (e.g. measured), we know that the header resonance is responsible for delivering lots of TQ to the rear wheels, but only when the header resonances are made to line up with the cam timings.
Thirdly, the "backpressure" actually improves mid range power, this is a sign that the collector is too short, not that backpressure is doing anything positive.
This is all found in Lingenfelters book "On modifying Small Block Chevys". I suggest you give it a read.
Absolutely correct on all counts - including the book - excellent read!
11-07-2005, 02:31 PM
#14
☠☣☢ Semper Ebrius ☢☣☠
Originally Posted by MitchAlsup
While this may have had some minor merit as an argument back in the days of carbuertors and before the days of dynamic pressure measurements in headers (and intakes), it no longer does.
Firstly, there is no such thing as actual 'back pressure' in an exhaust system, there is a constant series of high and low pressure pulses running around. Backpressure is mearly the average of these pulses, and a rather meaningless average at that.
Secondly, now that headers are much better understood (e.g. measured), we know that the header resonance is responsible for delivering lots of TQ to the rear wheels, but only when the header resonances are made to line up with the cam timings.
Thirdly, the "backpressure" actually improves mid range power, this is a sign that the collector is too short, not that backpressure is doing anything positive.
This is all found in Lingenfelters book "On modifying Small Block Chevys". I suggest you give it a read.
Firstly, there is no such thing as actual 'back pressure' in an exhaust system, there is a constant series of high and low pressure pulses running around. Backpressure is mearly the average of these pulses, and a rather meaningless average at that.
Secondly, now that headers are much better understood (e.g. measured), we know that the header resonance is responsible for delivering lots of TQ to the rear wheels, but only when the header resonances are made to line up with the cam timings.
Thirdly, the "backpressure" actually improves mid range power, this is a sign that the collector is too short, not that backpressure is doing anything positive.
This is all found in Lingenfelters book "On modifying Small Block Chevys". I suggest you give it a read.