first, let me start by saying i'm a complete newby at prom burning. i've spent quite a bit of time reading this board and the tech articles on prom burning and it's totally over my head. please forgive me if the questions i have are stupid.

a buddy is giving me a jet 6-pack unit (the one with 6 different settings). his car was a 350 tpi, mine's a 305 tbi, so it won't work, and he wasn't happy with it anyway. i've learned enough from reading this board that any chip is going to have to be custom tuned to the specific application to work properly.

what i want to know is can i get the jet 6-pack customized to my car. it'd be pretty cool to have a number of settings depending on what i was doing at the time.

i've read where craig moates made something like that, but isn't anymore.

thanks

 

All you need is one good chip.
Two if you use race gas.

Lots of things seem abstract, until you get in and get you hands dirty.

 

actually, i don't think that's entirely correct.

according to holley, the optimal air/fuel ratio for performance is 12.6:1 the optimal air fuel ratio for economy is 15.4:1. that's quite a difference. trying to address both in one chip would require a compromise.

emissions are a factor as well. i have to pass a yearly sniffer test. it's not currently an issue with the nearly stock 305 currently in the car, but if i follow through on my plan to swap in a built 400, i'm going to need an entirely different fuel curve to pass the test.

now, i understand that i could burn three chips and swap them out, but it would be a lot easier and certainly a lot cooler to have a switch i could throw to go between the three. one setting for daily driving, one setting for trips to the track or for when a **** burner pulls up next to me at a stoplight, even a setting for the smog alert days so i can do my part to make sure little old ladies and kids with asthma aren't keeling over in the street.

so i go back to my original question: does the jet 6 pack have chips which can be reprogrammed? are they the same chips used in our stock ecms? does anyone have any experience with this?

 

Actually Grumpy, IMO, is correct about getting in and getting your hands dirty.

If you are concerned about performance a 12.6:1 you would be under harder acceleration thus at higher kpa values and you could program the VE tables in these areas to keep the fuel to air near 12.6:1. Under light throttle cruse conditions you probably would be in the middle to lower kpa values and you could program these more near 15.4:1. This is all dependant if you have a cat on your car. The cat wants 14.7:1, running too rich near 12.6:1 for extended periods will probably kill the kitty!

There is no need for seperate chips.

 

you know, this is just like the tbi board. you regularly see people come on the board and ask how to make their tbis faster. invariably, the same people post saying "tbis suck. put a carb on it." over and over again.

first, i'm keeping the cat on it. i have to remain smog legal. i'm not interested in having to switch back to a "legal" setup every year for the smog check. i'm going to improve the performance of my car and be able to pass emissions ... period.

second, there isn't one "right" way to do things. different people have different priorities. i'm not sure what i want to do yet, i'm just curious and am trying to get some information, but all you guys are doing is telling me i'm wrong instead of answering the simple questions i've posed. i appreciate your opinions and will readily stipulate that for many people, burning one single chip themselves is the way to go. that may very well be the way i decide to go, but i still just want answers to a few simple questions:

does the jet 6 pack have chips which can be reprogrammed?

are they the same chips used in our stock ecms?

does anyone have any experience with this?

 

These guys are trying to give you a good answer, but you're just not hearing it! Before getting upset, listen, even if it's not a direct answer to your question.

What they are saying is that the proper tune for your application will do exactly what you are looking for. When you mash the pedal, th eA/F ration will go to like 12.6, when you cruise, it will go into highway mode A/F of 15.4, and normal running (what you should be hitting in the emission test) will hit near 14.7. Therefore, no real reason for multiple chips. The right chip can easily handle everything you need!

As for the "6 pack" working for you? Probably won't. I've never seen one in person, but I doubt it will plug in. If it has multiple chips, they won't be the right chip for your ECM. If it is one larger chip with multiple images on it, your program will take more room, therefor likely fewer choices on it (I'm not 100% on the image size thing).

Now, I'm not a seasoned prom burner, but I really have a grasp on things, and until you do, please don't make these guys sound like they aren't trying to help. They are, and they have a lot of info to share, just look through some of the archives!

 

first, i'm not locked into anything. i'm not sitting here determined to do this regardless of what anyone tells me. i simply asked a question and wanted an answer besides "you're wrong". maybe i am, but i want to know something about it before i just accept that at face value.

second, i have been reading the archives. one thing i noticed was, until recently, craig moates, certainly someone who knows what he's doing and what he's talking about, was marketing a multi-setting piece. if i read correctly, he didn't stop selling them because they were worthless or unnecessary, he did so because there were technical problems.

and, while i am no expert, the dynometer test we do here in georgia is pretty tough. a chip set for 15.4:1 economy will not do well when it has to run at 15 mph and 25mph on the dyno for over 5 minutes each. another thing i've noticed from reading the archives is that a lot of people who have to pass emissions burn chips especially for that (i believe with a 14.7:1 a/f ratio).

one of the ttractive things about dfi or f.a.s.t. is that it's easy to load a fuel/spark map. it'd be even easier to hit a switch in the car. apparently, craig moates thought so, too, as he was selling it.

again, emissions will probably not be a problem with the 305 currently in the car, but certainly will when the stack of 400 parts in my spare room ends up assembled and in the engine bay.

the bottom line is i don't want to get into a debate over whether it's a good idea or not, or, at least i don't till i know whether it's even possible. i have the piece coming, it's free. it's worth my time to look into whether it can be of value to me.

all i want to know is whether the chip(s) in the unit are diy programmable and if so, how. hopefully someone on here has some experience with this unit and can enlighten me.

 

Looking at the pics on the Jet web site, I'm sure you could. You'd just have to remove the chip and figure out how they have the different .bin's stacked. The drawback you have is using a TPI chip and you need a TBI. They are different. Jet does sell one for a TPI though. I'm sure if you contact them they'll hook you up, but it wouldn't be something you can DIY.