unhook the exhaust?

[destroyerofu2]

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.

[Drew10]

Originally Posted by linehand7

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.

[SUX2BU]

Originally Posted by HufferSS

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.

[HufferSS]

Originally Posted by SUX2BU

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.

[SUX2BU]

Originally Posted by HufferSS

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.

[Pro Stock John]

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.

[linehand7]

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...

[Pro Stock John]

need to keep track of weather to keep the results fair

[linehand7]

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.

[Titandriver]

Linehand7 -- mind telling who in Denver you took it to for the tune?

Thanks!

Rich

[linehand7]

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.

[linehand7]

the 10 hp was all the way across the rpm range also... not just on top

[Titandriver]

Thanks linehand! I heard there was a guy in Ft. Collins as well, I'll check your guy out first though.

Thanks again!