Thread: Any way to have multiple tunes and switch between them, without reflashing?

Not that I know of.

You still have to re-flash the computer to make any changes. DHP, HPT all require you to write to the PCM to change anything.

dont greg have a valet key and programming on the whipple car?

Who knows, and who cares.

Interesting idea. I suppose you could wire up 2 PCMs, then have some kind of switch to control which PCM is active...

The first problem I could see though, would be that if you switched off one PCM, drove the car on a 2nd PCM, then went back to the first PCM... then you'd probably need to do a CASE learn afterward. Perhaps there would be a way around that (say switch off the outputs but leave the inputs active).

Perhaps a different way to accomplish your goals would be a happy knob or switch and tuning to make the knob/switch very effective? Then you could add/remove say 5 degrees of timing on the fly. You could wire the same switch to turn performance shift on/off... might give you some kind of "track mode".

the problem is the pcm has what? 200 wires leading to it? now make that switch, i dare ya.

once a pcm has been ran in your car and its security is learned and it didnt ask for a crank learn, or you did the crank learn its golden forever. you can take them in and out back and fourth all day long, the car will just fire up and run like it should.

Originally Posted by ScottyBDoggs

the problem is the pcm has what? 200 wires leading to it? now make that switch, i dare ya.

once a pcm has been ran in your car and its security is learned and it didnt ask for a crank learn, or you did the crank learn its golden forever. you can take them in and out back and fourth all day long, the car will just fire up and run like it should.

Originally Posted by ScottyBDoggs

the problem is the pcm has what? 200 wires leading to it? now make that switch, i dare ya.

once a pcm has been ran in your car and its security is learned and it didnt ask for a crank learn, or you did the crank learn its golden forever. you can take them in and out back and fourth all day long, the car will just fire up and run like it should.

I guess if you're trying to use some switches you found at radio shack, yeah, you'd have issues... but they do make switches with enough connections that work properly for the application. Or you can just program a PLC with some relays, even an old Micrologix can do this quite easily. I've programmed them for similar functions.

I'm not saying it would be practical, but most automation supply stores would have what you need to build a system.

As far as the CASE learn... that's good info, it was my (mis)understanding that a CASE learn was required any time an engine was run/turned over with the PCM disconnected.


Edit... should have read that J57ltr already covered the PLC bit.

I think it would be quicker for me to just have an E85 and a gas tune maybe a 87 octane tune as well. Then just switch them out manually. I just figured that there must be something out there.

That is an idea to switch from one to the other. I've made redundant PLC control panels for critical applications, and it only takes 1 relay for each set (1 normally open and the other normally closed) and an A/B switch, but for the PCM that would take a relay bank 20" by 10" and heaven forbid a relay goes out lol.

Jeff

It would be nice to have the ability to flip a switch for e85/93. There is "performance" mode in the trans settings. Seems with the right table tweaks you should be able to put "performance mode" into other areas like fuel and spark. Maybe with the right software. Maybe ATuner will have this ability?

Side note, how difficult is it to add a performance button to a car without one? Would you just put the right pin in the pcm and have a switch that grounds it when flipped on?

Originally Posted by bandook

It would be nice to have the ability to flip a switch for e85/93. There is "performance" mode in the trans settings. Seems with the right table tweaks you should be able to put "performance mode" into other areas like fuel and spark. Maybe with the right software. Maybe ATuner will have this ability?

Side note, how difficult is it to add a performance button to a car without one? Would you just put the right pin in the pcm and have a switch that grounds it when flipped on?

just learned this one myself. its 2 things in dhp you change, and then add a pcm pin and wire to pin# 21 on the clear plug to the switch, ground the other side of the switch.

if you dont tune the pcm to know all your doing is turning on the light in the dash. some dont even have the light bulb install.

There was definitely a write up on this before... Dual pcms, dual programs. Personally, I don't see the problem with just bringing your laptop and dropping the tune you need for what you're doing at the time, ie, track. But that's just me : )

Originally Posted by coolone

There was definitely a write up on this before... Dual pcms, dual programs. Personally, I don't see the problem with just bringing your laptop and dropping the tune you need for what you're doing at the time, ie, track. But that's just me : )

Yeah, this would be the smart/practical idea for sure. Heck, even a cheap little netbook can do this... maybe just keep an old laptop in your car just for this purpose? People are even tuning with tablets now, it seems. I wouldn't be terribly surprised if someone figures out a way to flash the PCM from a smart phone.

There was a socket made in Australia that when soldered in allowed for a secondary EEPROM and with the flip of a switch the active program was selected. No idea its status or where to find one

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the socket would need to fit an Intel intel ab28f400b5 EEPROM.

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