Backpressure and cutout "theory"
#1
Backpressure and cutout "theory"
Ok, I've been pondering this "theory" for a while. Looking for some input or if anyone has tried it yet.
My idea stemmed from seeing many different timeslips and the effects of cut-outs on 60' and 1/4 times. From what I've seen is the average gain is a 1/10 in the overall time and 1 more mph with cutouts open, but the 60' time suffers vs full exhaust times.
Now my idea is; if you have E-cutouts you could benefit from both scenarios right?? Have them closed for staging and launch through first gear and hit the switch in the beginning or middle of second gear. This would give the needed backpressure for low end torque off the launch and give the open header flow for the topend. If that would work it could turn the 1/10 gain into a 3/10 gain maybe 4 as well as the added mph.
I will test this soon, but as of now I have no trans in the truck and my exhaust is not yet complete. So your thoughts, experiences, and comments/opinions are requested.
My idea stemmed from seeing many different timeslips and the effects of cut-outs on 60' and 1/4 times. From what I've seen is the average gain is a 1/10 in the overall time and 1 more mph with cutouts open, but the 60' time suffers vs full exhaust times.
Now my idea is; if you have E-cutouts you could benefit from both scenarios right?? Have them closed for staging and launch through first gear and hit the switch in the beginning or middle of second gear. This would give the needed backpressure for low end torque off the launch and give the open header flow for the topend. If that would work it could turn the 1/10 gain into a 3/10 gain maybe 4 as well as the added mph.
I will test this soon, but as of now I have no trans in the truck and my exhaust is not yet complete. So your thoughts, experiences, and comments/opinions are requested.
#4
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I'll say the same thing on the intake side of things. I cut the 'baffles' off the intake tube and noticed a drop in performance on the low end. I wasn't happy with it at all so I bought a new factory intake.
I run my exhaust open all the time... until I see the police. I definately feel sluggish off the line, which is embarrasing given the amount of noise I'm making. Mid-range is great though. But with the gas savings I'm getting..., I just keep it open.
I run my exhaust open all the time... until I see the police. I definately feel sluggish off the line, which is embarrasing given the amount of noise I'm making. Mid-range is great though. But with the gas savings I'm getting..., I just keep it open.
#5
Originally Posted by white1
I would think by the time the cut out got all the way open, you would be done with the 1/4
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#8
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Join Date: Nov 2003
Location: Edmonton Canada
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Interesting, I was thinking the same thing, get and e cutout, keep it closed till your past your 60' then open em up, get the benifits of both.
I've got a e cutout sitting here, I just need to get a splitter pipe installed so I can hook it up.
I've got a e cutout sitting here, I just need to get a splitter pipe installed so I can hook it up.
#9
Originally Posted by bluecajun5.3
with the mods you'll be running, i think you benefit more from the cutout open rather than closed.