Ok I have purchased a Jet Performance Programmer and I want to do a custom tune for my 97 Expedition. I'm not a very techy kinda guy so I don't know much about this stuff. I just need some info from the pro's out there and tell me what I should adjust the shift firmness, shift points, rev limiter, top speed limiter, ext. to to get the most performance out of this without decreasing the life of my tranny. I need all the info I can get please

Also what kinda hp and mpg gains should I see?

Thanks

97 expy with 295/70r17 trail grapplers
spectra air intake
flowmaster 40 dual exhaust

 

Hate to be the bearer of bad news but doubt anyone on the site will have the info you seek. The Jet is not one of the preferred devices. Maybe I'm wrong and someone will post up what you seek.

 

I've never heard of it! That doesn't mean it's junk, possibly it's just a new product.

However, you can increase the top speed limiter to anything you want. It won't hurt the vehicle unless you drive it faster than the road conditions allow or, exceed the tire's speed rating. Just because the limit is high, doesn't mean you have to drive it that fast.

The shift firmness should be set so the shifts are "quick", but you don't want to feel an abrupt "punch" when the shift takes place. That puts stress on the mechanical components. One of our members, Longshot270, says it should not feel like a kid is behind you kicking the seat when the shift takes place.

I don't know what transmission your vehicle has, but a 2000-2008 F150 can start to have torque converter ballooning above 5400 RPM. I would not set the rev limit much above that.

I think your WOT shift points should be at least 400 RPM below the rev limit, or they may not complete. Part throttle shifts can really be adjusted any way you like.

I have no idea if you'll see any MPG gains, and I would expect no more than a 15 HP gain, if you're lucky.

- Jack

 

For what one of those things cost, for not much more you could have bought a SCT device with CUSTOM tunes..................

 

the Jet cannot be custom tuned...


so hopefully you can return the device and get a SCT product that can be custom tuned

 

The Jet programmer has options to change the stuff I listed above(shift firmness, shift points, rev limiter, top speed limiter, ext). Isn't that what the SCT does too except you can have more than one custom tune?

 

A custom tune is one written by a professional tuner for your particular strategy and mods, backed up by datalogging.

 

a custom tune adjust parameters far beyond what the user settings are...