OP, just run it a couple times and see how it does. Probably won't see much of a difference with just a cutout, imo.

 

Just came back in to post some results- car is bone stock except the K&N CAI, resonator delete- and cutout in place of it.

First run of the night was 14.244 @ 98.59 mph w/ a 2.232 sixty foot; cutout closed, headlight removed- and a FULL tank of gas (hadn't planned on racing, but the weather worked out ok)- this is at about 1300' elevation with temperatures ranging from about 75 to 69* by the time I left. Should've pushed harder the first time because they had just sprayed the VHT about 3 cars ahead of me.

Last run of the night was the best at Last run of the night was my PB for the night at 14.211 @ 100.23 mph w/ a 2.273 sixty foot - with my cutout open.

The other runs in between (only got 3 others in, 1 being a total waste b/c I was being dumb and let off ~10' early) were slower ET with mph in between the two above. Seemed like the cutout gained about 1 mph on average (taking into account that it cooled off a little, and I had less gas/weight as time went on).

I did the runs with trac/stab ctrl both off- and letting it auto shift 1-2, and then dropping to M to hold 2nd through the traps- that seemed to work great.


Also wanted to comment on this too:

I was asking for results from LS4 owners- I don't care to hear generalizations or what would happen on your TA- or I would've posted the question in a general forum.

Its a nearly stock daily driver, of course its not going to be fast, that's what my monte is for.

That's why I asked- I've seen cars with no effect, and I've seen people lose ET before (on other platforms), hence why I came here to ask what others experiences were. I didn't come in here asking for generalizations about cars in general, that is why I came specifically to the LS4 sections.

I was just curious what other owners experiences were- and since you don't have one, I don't know why you're commenting.

You gave me general info that I could've got anywhere, that is not what I asked for, then you got all worked up about it.

I know that, but I wanted to see on average what to expect. So just because answers vary so much, we shouldn't ask any questions about what 1/4 mile time or hp to expect ever? Come on man...

As I said, if my thread offends you for some reason- don't look at it.


Its not private, but I was asking for EXPERIENCE from other owners, not generalizations from people that don't even have one of these cars- otherwise I would've posted on one of the other forums I'm a member of, or in the general section. I'm not a moron when it comes to cars, I know cars generally gain mph- but I was asking how much, if any other people had.

There is no problem with you giving input on stuff you know specifically about in this section- if someone is asking for a spark plug recommendation, or for a good place to get heads ported- something that you may directly know about; but I was asking something specific to the LS4 cars from owners that had experience with an LS4 car, a cutout, and the track. I don't see why that's so hard to understand- then you kinda turn into a dick about it

That's what I was curious about because I feel the exact same thing, it seems to have more torque and low end grunt with it closed- but above like 4500 rpm at WOT- it seems quicker with it open. I had thought about trying a run with it closed to help through 1st, and then once I got close to the shift, I'd open it up- but I didn't get a chance.

 

Damn it.... It hurts..... Ahhhhh.....


Wait, do I win a prize?