has anyone dynoed a 6lb lower with no chip? any a/f ratios?

 

How about a 4lb?

 

6# with no chip...that's nuts

 

Please provide data to support this assertion.

 

I don't think he was interested in running this continuously........sounds like he just wanted to see the results of a dyno without adjusting the stock a/f ratios.

JC

 

Why do so many people think the computer will not add fuel to maintain a safe A/F ratio? The computer uses many sensors, including O2 sensors. If it sees it's running a little lean, guess what? IT ADDS FUEL!

 

I had ran a 4 pound on dyno with no chip, and all my mods in signature except plasma booster. I dynod at 400.1 hp and 476 torque corrected. dyno did not have wide band but there was whisp of black smoke coming out of pipes on every run. when i checked stock plugs they had a brownish tan insulator with black soot on the threads. Ran this way for 2000 miles. even ran a top speed run up past 140 in 32 deg weather. No hint of detonation either with 91 octane. I have since put IT22 's in and plasma booster and 6 pound and 91 octane still no hint of problems, no detontion, plugs look good . that was 4000 miles ago it should be 420 now and over 500 torque . Thers one person on the boards thats running 18 pounds of boost and no chip , but has a built motor.The only way i'll get a chip again is to have it tuned on a dyno and havn't found a place around here , nearest is california.

 

I do not have sufficient test data to back up my claims that not using an aftermarket chip that would be programmed to compensate for the added boost pressures that likely will be experienced by adding a 6# pulley would be nuts.

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How's that?

 

Very good!

But what does an aftermarket chip do to compensate for added boost?

Most of the chips that I have heard of lean the mixture and add timing.

Is that how they compensate?

 

If you can lean the mixture and add timing, why can't you richen the mixture and remove timing? Is it only one direction you can program?

 

Good point. BUT I have been told by various tuners that you can add a pulley w/o a chip, but to realize the "full potential" of the chip (in other words, add more power) a chip is necessary.

So how do you suppose they add power with a chip? I assure you it is NOT by making it run richer or retarding the timing...

 

I totally agree.

In my application, I would not put a 6# on without a chip, and the simple explanation is that I don't know what will happen at WOT on the NJ Turnpike, and I don't have the money to want to find out.

Being an engineer, I hate not knowing what parameters the tuners are actually programming on these chips. I could never get a straight answer. One Superchip tuner I know (and do not use) couldn't tell me because he just downloads Superchips programs for various setups.

I perform electromagnetic compatability testing (EMC Testing). When our customers tell us it is like "Black Magic", I know what they are talking about.

 

Big misconception here guys.....the computer does NOT compensate for added boost with extra fuel at WOT. You can get away with some extra boost and no chip because your L comes with a nice rich tune from the factory. At WOT (open loop), the sensors do not come into play...your computer uses preset fuel and timing tables based on load.

 

This is the kind of info I was looking for in another thread but never got...

So are these tables adjusted or updated by the computer as the truck is driven or are the "set in stone" in the chip?

I know there is a mode commonly know as "limp home mode" that is used when the check engine light is on due to a problem. In that situation, the table being used is not one that has been customized, if you will, to your particular truck/driving habbits by the computer but one that IS set in stone.

 

Run good gas with a clean fuel filter and nice tight plugs (proper heat range) and you will be fine. I know people who have dynoed 2#. 4#, and 6# with no chip.

--Joe