Cutout at the track?
Thread Starter
Teching In
Joined: Sep 2009
Posts: 40
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Cutout at the track? Going to the track for the first time with my GXP tomorrow. Curious what you guys are finding is the best way to run with a cutout? Always open- always closed, or are you opening it going down the track?
Its hard to tell for me on the street if it is faster or slower with it- I know some NA cars don't like wide open exhaust, so I was just curious.
Its hard to tell for me on the street if it is faster or slower with it- I know some NA cars don't like wide open exhaust, so I was just curious.
Thread Starter
Teching In
Joined: Sep 2009
Posts: 40
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Lol... You are bypassing the muffler which is a restriction..
Open it before the run and make the whole pass with it open.
Open it before the run and make the whole pass with it open.
Last edited by bumpin96monte; Mar 19, 2010 at 04:06 AM.
Thread Starter
Teching In
Joined: Sep 2009
Posts: 40
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No they don't. If you don't want answers, why ask?
I've heard of different types of cars/engines going both ways, and since I'm not an LS4 expert- I figured I'd post a question- seems pretty simple doesn't it?
If my thread irritates you for some reason, you don't have to read it.
98% chance your car will pick up some, especially trap speed, with it open.
I was hoping to see responses like "I run .3 and 2 mph faster with it open" or "I run a little slower with it open" or "it doesn't seem to make much difference on mine", etc. Obviously when I get to the track I can mess with it there (since I have nothing else that is really adjustable on the car other than tire pressure), but I just wanted to see what other people had experienced with them; as it is likely to be busy and I may not be able to get a lot of runs in- I don't see what the big deal is here, seems like such a simple thread to me.
And I gave you one. Nothing is my deal, I came in here to help you.
It is going to be slow with it opened or closed. 
All car types will gain from it in stock form. There are always a few in the batch that don't gain or lose ET. Don't ask me why.
It is like that with all platforms. This is a public forum, your answers will vary greatly.
Nothing is a big deal... You are being a girl about my answer. It is simple.
I want to know what people who have LS4 cars have experienced- are their cars faster, slower, the same, etc with their cutout open- and by how much.
I've heard of different types of cars/engines going both ways, and since I'm not an LS4 expert- I figured I'd post a question- seems pretty simple doesn't it?
I've also heard of some people with other cars having better luck leaving with it closed, and then opening it up partway down the track.
I was hoping to see responses like "I run .3 and 2 mph faster with it open" or "I run a little slower with it open" or "it doesn't seem to make much difference on mine", etc.
I don't see what the big deal is here, seems like such a simple thread to me.
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Hey bud, you umm... qouted your self, not being a dick just letting you know...
Staging Lane
Joined: Oct 2009
Posts: 76
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I feel the car (ls4 grand prix) runs better in city with no cut out and runs better with open air flow at WOT.
I vote run the cutouts at the track besides why not be louddd at the track if there is only going to be a minimal difference either way unless you are really tracking this car. If its for fun, i'd run it loooouddd with little restrictions.
I vote run the cutouts at the track besides why not be louddd at the track if there is only going to be a minimal difference either way unless you are really tracking this car. If its for fun, i'd run it loooouddd with little restrictions.
