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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 07-15-2012, 10:13 PM   #1
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unhook the exhaust?

In the old days, we used to drop the exhaust and run open headers, bump up the timing, and put high octane fuel in the car and head for the strip... Today we are already running the high octane and the computer takes care of the timing and the air fuel ratio, so .... can you unhook the exhaust from the axle back and gain some power while at the track? Or will the computer go nuts? (need to drop 2/10ths to be happy) car is stock except for tvs 2300 with magnusons tune. 2ssrs on dr turning 12.2 at 1700'
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Old 07-15-2012, 10:21 PM   #2
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I'd say ur tune will b off

Especially Sence u have a blower
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Old 07-15-2012, 10:25 PM   #3
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i dont see why it would be an issue. i mean what would be the difference between removing the exhaust and using cut-outs?
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Old 07-16-2012, 10:42 AM   #4
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Sure you could take the entire axleback off and just run straight pipes. I think it would only run a hair leaner nothing that would concern me personally.
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Old 07-16-2012, 12:32 PM   #5
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Sure you could take the entire axleback off and just run straight pipes. I think it would only run a hair leaner nothing that would concern me personally.
i think he means removing the entire cat-back assembly and just running open headers
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Old 07-16-2012, 01:00 PM   #6
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It's worth a shot, remove the hole catback and install a 12 inch pipe off the headers. Most engines like a short piece of pipe off the colector for most power, without it you can actually loose power. removing the catback will remove wieght as well and not hard to do. Good luck, my olds ran the fastest with a X pipe off the headers and dumped before the rear without mufflers.
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Old 07-16-2012, 07:07 PM   #7
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thanks guys... thought i would have more responces by now, looks like we have some of the young "know it alls" stumped. I spoke to magnuson and they said there tune was good for cai and aftermarket exhaust, any more mods and they recomend a professional tune, this is why i wanted to drop the axle back. I understand the tune wont be perfect, but i was hoping for a few hp. I dont have headers just wanted to drop the axle back, (hoping to reduce enough back pressure-like an aftermarket exhaust system) I agree with PROSTOCKJOHN ... just wondering if it would throw a cel. and DENIS... do the exhaust cutouts throw a cel?... completely taking the axle-back cant hurt for weight either, has anyone else tried these things? my next trip to the track won't be untill Labor Day weekend, but I'll be there for 4 days some of it will be test-n-tune... I think I'll give it a try.
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Old 07-16-2012, 07:13 PM   #8
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You will gain nothing.

It will sound cool though.
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Old 07-16-2012, 07:15 PM   #9
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bad70supreme... good advise, thankyou, I'm also doing a Nova for the wife ( her dream hot rod) and was planning on doing that exact same thing. would you recommend 3inch pipe... It will be a small block chevy with a blower, If I have one she's gotta have one... You know howthat goes...lol
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Old 07-16-2012, 07:33 PM   #10
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My daughter has been running my extended cab duramax (with a Predator Programmer) at a 14.7 at 95 mph... She wants to make the 100mph club (you get a sticker for your car) I thought if i drained the auxillary fuel tank (30 gallons of fuel in it) and removed it, took out the fifth wheel hitch, removed the tonue cover, the spare tire, the reciever hitch and the tailgate I would lose close to 600 pounds, and if i dropped the exhaust from the cat back (and put on a tuner pipe) and prayed for a south wind ... she would probably make it...LOL Any other tips for a duramax 4x4 would be appreciated... thankyou CAMARO5 this is THE BEST FORUM for all chevys. Even the vette guys think so... even if they don't admitt it.
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Old 07-16-2012, 07:44 PM   #11
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hufferss... any reason why? will i lose boost? is it because its not tuned for it? please elaborate...
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Old 07-16-2012, 08:01 PM   #12
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Won't run slower. Usually blowers like less restriction. So do nitrous and turbos too.

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Old 07-17-2012, 10:27 AM   #13
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Quote:
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hufferss... any reason why? will i lose boost? is it because its not tuned for it? please elaborate...
No...the factory exhaust just isn't a restriction past the headers and cats.
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Old 07-18-2012, 11:03 AM   #14
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I have QTP cut-outs and i have yet to dyno my car to see the difference...but i think the only power gain you get from cutouts is you sound louder
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Old 07-18-2012, 12:22 PM   #15
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1. get a good dyno tune, not the can tune that comes with the charger. IMHO the tune alone can get you some good numbers (if done right).

2. try and drop some weight from the car 2/10ths is about 200lbs from what i hear.

3. mufler delete can get you a few HP but we are talking maybe 4 at most on N/A.
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Old 07-18-2012, 12:29 PM   #16
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Quote:
Originally Posted by linehand7 View Post
My daughter has been running my extended cab duramax (with a Predator Programmer) at a 14.7 at 95 mph... She wants to make the 100mph club (you get a sticker for your car) I thought if i drained the auxillary fuel tank (30 gallons of fuel in it) and removed it, took out the fifth wheel hitch, removed the tonue cover, the spare tire, the reciever hitch and the tailgate I would lose close to 600 pounds, and if i dropped the exhaust from the cat back (and put on a tuner pipe) and prayed for a south wind ... she would probably make it...LOL Any other tips for a duramax 4x4 would be appreciated... thankyou CAMARO5 this is THE BEST FORUM for all chevys. Even the vette guys think so... even if they don't admitt it.
What year is your truck? If it's an LLY or LBZ model Duramax, EFI Live will work wonders for you. If it's an older LB7 motor, you can try bigger injectors.

Edit: I see it's a 2003, which is still an LB7 motor. Start with upgrades to the fuel system like fuel rails, then a torque converter. That will get you to 100 pretty easily I think.
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Old 07-18-2012, 12:38 PM   #17
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You will gain nothing.

It will sound cool though.
The catback and mid pipes weigh 71 lbs, so that with the slightly better flow will gain him at least a tenth.
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Old 07-18-2012, 01:27 PM   #18
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The catback and mid pipes weigh 71 lbs, so that with the slightly better flow will gain him at least a tenth.
My money is still on no gain. Besides...I think he is talking disconnect as opposed to remove.
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Old 07-18-2012, 01:35 PM   #19
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My money is still on no gain. Besides...I think he is talking disconnect as opposed to remove.
Yeah I don't think there is enough room to disconnect and just hang there. The pipes would still line up, you would have to remove it to free up the exhaust path.
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Old 07-18-2012, 01:50 PM   #20
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If OP runs open headers the weight drop will help as J noted and it should run quicker. Why not try and report back. Keep track of weather.

If running full exhaust helped we would run them on dedicated drag cars.

Though the ET improvement will be due to a mix.
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Old 07-18-2012, 05:43 PM   #21
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thanks guys... like i said i won't be going back to the track untill labor-day weekend... friday is test n tune... i will try some of these things and report back...
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Old 07-19-2012, 11:48 AM   #22
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need to keep track of weather to keep the results fair
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Old 08-26-2012, 11:56 AM   #23
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REPORTING BACK! went a different route, bought LG Motorsports 1 7/8th headers with there 3 inch exhaust with x pipe. the 3inch goes back to the axle then reduces to 2 1/2" and hooks to the factory mufflers. took it to denver for a tune and when we were done we pulled the factory mufflers off and did one more pull. we gained 10hp! tune did not change. air fuel stayed the same. pretty awesome for 3 minutes worth of work (take off 2 exhaust clamps and pull the mufflers off). Old School Rules! and superchargers like to breathe! I guess this is why most of the axle back systems are claiming 10hp.
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Old 08-26-2012, 03:09 PM   #24
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Linehand7 -- mind telling who in Denver you took it to for the tune?

Thanks!

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Old 08-26-2012, 04:48 PM   #25
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titandriver- The boostcreep in longmont co. Harvey is his name and he loves tuning cars. theboostcreepltd.com or 303-219-6071. tell him brian from south dakota sent you. he also does saturdays by appointment.
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