Pontiac GTO 2004-2006 - 2004 GTO 2.5" cutouts results...

Installed some 2.5" cutous and headed to the track friday night. My previous best was a 13.2 @ 106 with a 2.0 60' on stock tires with a 2200 da. Friday night ran a 13.2 @108 with a 2.0 60' on stock tires with a 1160 da....so whats the deal here? Thought I'd do better...any suggestions? Thnx

How much did you think you would pick up ?

Atleast a tenth...good news is I picked up 2mph overall...

The deal is, that for your mods, you don't have much restriction that you're bypassing...even if you actually had mufflers.

You have LM's, which don't cause any sort of restriction anyway. If anything, you're getting rid of the back pressure/scavenging.

You're not gaining any power by opening, just cool noise. I have them on mine and really don't notice much of a difference at the track with them open/closed.

Thats what I heard...the lm1 is not really restrictive enough to see gains. Your right sounds cool though.

Yea there is no restriction with the LM's
Its just a big hollow chamber.

The only aftermarket cat back that actually restricts power are the flow masters from what I'm told.

Thnx for the input guys....just did some more weight reduction sunday. Removed the tank brace aswell as the v brace. So hooefully that will put me a lil closer towards my goal. Also thinking bout removing the skid plate just for track purposes.

I figured I would pick up a couple tenths considering I picked up 2mph....idk though

The DA was better on your second run, that accounts for some of the mph. Launch also has a lot to do with it. A soft launch 2.0 60' will hurt trap, but a slight spin 2.0 60's will have a higher trap. A sticky launch can make your trap go lower too. Cut-outs really wouldn't help you at all with your set-up

The DA was better on your second run, that accounts for some of the mph. Launch also has a lot to do with it. A soft launch 2.0 60' will hurt trap, but a slight spin 2.0 60's will have a higher trap. A sticky launch can make your trap go lower too. Cut-outs really wouldn't help you at all with your set-up

Aite got ya...oh well back to the drawimg boards!!

Your best mod for the track would be sticky tires and supporting suspension mods. If you knock your 60' into the 1.8 range, your E.T will easily be in the 12s.

^^^^Agreed

Your best mod for the track would be sticky tires and supporting suspension mods. If you knock your 60' into the 1.8 range, your E.T will easily be in the 12s.

Im working on getting some m/t slick off a guy nearby where I stay....thats what iwas thinknking also. Lower my 60' with some slicks and 12's for sure. Hopefully low 12's when I do my cam swap here in a few weeks..

What cam?

What cam?

Not 2 sure yet kinda just been looking around seeing whats out there....

You need to work on your launch/driving. Even with stock exhaust with headers and a good tune you should be in the 12s at that kind of DA. Taking away weight in the rear will make launching harder and that little bit of removal in the front will do about as much as your cutouts. . . nothing. You also may find that adding more power may make the quest even harder as wheel hop and and other factors will hurt your ET even as your speed goes up.

Yeah I removed some weight from the rear (about 100lbs) and run with less then a 1/4 tank and is killing me. Last time out, I added over 100lbs to the rear. I still didn't do great, but I went a 12.56 at 112 and 1.95 60' to a 12.52 at 112 and 1.93 60'. Next time, I'm adding more weight to the rear.

Yeah I removed some weight from the rear (about 100lbs) and run with less then a 1/4 tank and is killing me. Last time out, I added over 100lbs to the rear. I still didn't do great, but I went a 12.56 at 112 and 1.95 60' to a 12.52 at 112 and 1.93 60'. Next time, I'm adding more weight to the rear.
Thats pretty damn good for ur ls2 with those mods, I guess its all in the driver.

You need to work on your launch/driving. Even with stock exhaust with headers and a good tune you should be in the 12s at that kind of DA. Taking away weight in the rear will make launching harder and that little bit of removal in the front will do about as much as your cutouts. . . nothing. You also may find that adding more power may make the quest even harder as wheel hop and and other factors will hurt your ET even as your speed goes up.

Yeah idk I launch at about 3200 rpm slipping the clutch...2.0 60 is as good as she gets. Its all good though I just picked up a set of mickey thompson et drag slicks..

Just to show it can be done this was back when I was headers and a GMM shifter on my otherwise stock '04. Track prep was excellent that day, tires at 24# and the DA was just under 1,000. Good luck. You'll get there.

http://i92.photobucket.com/albums/l40/svede1212/Drag%20Racing/first12.jpg

Yeah I'm actually not happy with my times lol. I've heard a 112 trap is good for an 11.9, but I think the car has 12.2-12.3 in it. This vid is only a 12.6 or 12.7 run, however, it shows the same issues I have running the 12.5. When I run 12.5 is usually when I hit a 1.95 (not impressive) 60' time, but turn up the volume and you can hear my rear tires break loose on the 1-2 shift and I have to let off the gas for a second. It kills me every-time. I have vowed to not go back without some DR's and a stall lol. There is a local here who was running 12.3 in his LS2, with headers, intake, exhiuast, tune, and without a ported intake on slicks.

http://www.youtube.com/watch?v=f4_S0M2rO_4&context=C31f2171ADOEgsToPDskKNs4UePSioxpUWN1Auskr9

How effective would a cutout be with longtubes and a stock catback? Would there be a more noticeable gain?

Not if thats the only mods you have.

To really notice a benefit from cutouts, I think you need to have a pretty stout motor. LT's and a 2.5" exhaust isn't really very constrictive.

Ya but the louder it is the more power you think you have! :)

Just out of curiosity how are u guys launching? How can I improve my times or launch technique? Im an m6 by the way...what rpm should I launch at with my slicks? Slip the clutch or quick release?

What mods do you have?

I was launchin off a 2step at 6k on slicks, and trying as best as j could to slip a stage 3 monster. Would pull 1.6xs or low 1.7xs.

After them cam swap, i only got to run a few times on et street radials and never got the launch dialed in....for some 1.9 60s

For some reasom my sig didnt show last post, but mods in sig plus I just picked up a pair of m/t et drag slicks...thats what im hoping for some 1.6x's

For some reasom my sig didnt show last post, but mods in sig plus I just picked up a pair of m/t et drag slicks...thats what im hoping for some 1.6x's

How is your drivetrain from the trans back...ie axles,stubs and rear?

I picked up a huge 4hp with my cutouts and I still have the factory catback piping with the crushed section. They do sound sweet though

How is your drivetrain from the trans back...ie axles,stubs and rear?
stock
I picked up a huge 4hp with my cutouts and I still have the factory catback piping with the crushed section. They do sound sweet though

impressive...

Just to show it can be done this was back when I was headers and a GMM shifter on my otherwise stock '04. Track prep was excellent that day, tires at 24# and the DA was just under 1,000. Good luck. You'll get there.

http://i92.photobucket.com/albums/l40/svede1212/Drag%20Racing/first12.jpgI had similar results. Headers, Speed Inc CAI, and 160 t-stat and I ran a 12.9 launching at idle because anything else would just spin. Bought some Nittos and it went down to 12.7. Swapped in a LPE GT2-3 and went 12.5. Swapped LS6 heads and it dropped to 12.3.

After a couple of cam swaps, I should be in the 11's. But I haven't been to the track since '06 but I'm making a lot more power than when I ran the 12.3 run.

All with the stock catback :)

I had similar results. Headers, Speed Inc CAI, and 160 t-stat and I ran a 12.9 launching at idle because anything else would just spin. Bought some Nittos and it went down to 12.7. Swapped in a LPE GT2-3 and went 12.5. Swapped LS6 heads and it dropped to 12.3.

After a couple of cam swaps, I should be in the 11's. But I haven't been to the track since '06 but I'm making a lot more power than when I ran the 12.3 run.

All with the stock catback :)

Those are some real good times for yhe mods u both have...i must b launching wrong or shifting wrong...i do spin a bit 1-2 shift and 2nd to 3rd a little...

With your current power levels it all in the 60'. Or in other words TIRES...TIRES...TIRES. Drag radials are Night /day difference at the track when compared to street tires. I know guys running low 10's through full exhaust.