Give me my low end TQ back?

Running straights now and noticed low end TQ went bye. So will the dynomax bullet bring it back?

 

Not highly but a little, X pipe it if you have not, or go back to a single intermediate pipe system.

 

Need to know your exact system, i.e. pipe size, bend types, true duals or SIDO, etc.

 

Pipe size?

 

Siso in front of tire. No muffler 2 1/2.

 

One 90° bend no tip yet.

 

unless you removed the cats, the overall backpressure for the entire system will be about the same. There is really only a very small CFM increase when a muffler is removed- most of the restriction is at the cats. It also takes no less than 50 miles for the ecm to recalibrate (100+ in a few cases)....given the age of your truck, the o2 sensor might be a little lazy which would slow the ecm's ability to recalibrate...I would check for other causes.

 

Yep, go back to a single, run at least one converter per side and a straight thru muffler, nothing chambered. That will get the flow/velocity right with the factory tune,- therefore your low end.

 

I am running single. No muffler though all 4 cats. So a bullet will bring my low end tq back?

 

You said your running straights lol. So you mean you just hacked your muffler off correct ? Iduno, I think the Bullet is a straight thru design. (?) Someone else will have to confirm. But yea, running the factory tune, you'll get more low end w/a straight thru of some kind.

 

Straights actually increase power due to removing all the restriction from the muffler. IMO, people think they are losing power because they can actually hear the engine working instead of being dead quiet while powering at 3000 RPM.

 

Yea, further up into the RPM's. But for normal driving, it's the usable torque loss that's he's noticing. You loose some low end ONLY because of the factory tune. But honestly, it can't be all that much when running all 4 factory cats. Some tho. When you consider torque, you have to consider at what rpms your @ peak. You can gain torque, but the trick is,(I guess it's sort of a trick) keeping peak torque at the lowest possible rpms. You don't want to move the power band further up into the rpms unless you drive @ WFO or Race the clock. Useable Torque and Horse power starts just above idle.

 

Yea. Before i took the muffler off i could spin the tires no problem from a dead stop. But with no muffler i can't.( untill today i got it to) I'm not looking for racing or anything i just tow alot in the summer. I want to get a tuner also but that is a little later.

 

No, because there is essentially no back pressure loss that the ecm cannot adjust for. there is another issue...probably the o2 sensor is lazy given its age and that is one of the key tools for the ecm to adjust the fuel mixture.

 

With regards to “Chips” and “Tuners”, years ago it was the best that most could do to enhance the ignition timing, fuel curve, transmission shift points, etc. It was (and still is) very important that a person verifies that the “Tuner” is ASE certified in both ECM and Transmission programming and IMHO be have current certification by the OEM whose vehicle you want to modify. There are plenty of persons who advertise their programs to be the best and even offer custom tunes, but in all reality, very few actually have credentials in these areas- but that’s not to say that some of these “geniuses” haven’t really caused damage to a few vehicles- just jump over to flatratetech.com and read just some of the comments from the MSE techs!. Perhaps what is equally important is the parameters that can be adjusted are set by the oem vehicle software…so there is really no “magic” in what they are doing anyway.

IMHO, if you live near any major city there are excellent tuning specialists with dynos who for the same price (if not less) will tune your vehicle taking into consideration your specific needs including environmental conditions, for your specific vehicle. IMHO, the best bang for the buck!