HP Tuner

[VD2021]

I purchased HP Tuner shortly after starting my build. So far I have used it to check systems, change my radiator fan on/off temps, shut off VATS/Column and a few other minor thing.

I'd like to start gathering some of the experienced user's tips and tricks for tuning. I get DTC P0171 and P0174. From what I've gathered I need to adjust the fuel trims. What is the best new user friendly way to make adjustments?

All other HP Tuner tips are welcome also.

[Tweek]

I'm not exactly positive as to which brand tuner you are using, but if it's made by Diablosport (or if you have around $300-$600 to buy one from them; their's work the best with LS engines IMO), the customer service guys there were great help when it came to using my Trinity. I had an issue with one of the custom tunes I programmed and when I inputted it into the vehicle, it had the check engine light showing solid until I re-inputted the stock tune back in. I emailed them my custom code and they tweaked it and sent me a revised copy and when I installed it, it gave me an additional 23 HP over the program I made, without the check engine light problem. I only bring that up since typically, most companies are more then willing to assist you directly with a custom tune. Hopefully that opens up a few doors for you to try...

[Linxs]

HPtuners has a whole forum dedicated to helping people out. Just got to their home page and use the link there to get to their forums.

[VD2021]

HPtuners has a whole forum dedicated to helping people out. Just got to their home page and use the link there to get to their forums.

Yeah. I am a member of that forum. There is a lot of data there (maybe too much??).

[eseethal]

A good write up of the basics can be found here:http://www.ls2.com/boggs/ls1edit/ls1%20tuning%20info.htm

Eugen

[VD2021]

A good write up of the basics can be found here:http://www.ls2.com/boggs/ls1edit/ls1%20tuning%20info.htm

Eugen

Eugen,

Thanks. That's exactly the type of information I was looking for.

[rev2xs]

Sorry to hijack the thread but, I wonder if it is possible to use HPtuners to tune your PCM to take advantage of Higher octane fuel? From what i have read on other forums, there seems to be a belief that the higher the octane the fuel is, the engine generates the same amount of HP just using less fuel to do it. Is this accurate? If this is correct, then is it possible to, through PCM turning, to make the engine use the same amount of fuel as it would with lower octane fuel and make it generate more HP?

Another question, does anyone have a custom PCM tune somewhere out there that we can download specifically intended for the GTM? Since the setup in a GTM is slightly different than a standard Corvette.

[eseethal]

Here is also a more extensive compilation of the processes of tuning: http://quick99si.home.comcast.net/~quick99si/misc/Cpig's_HPT_TuningGuide_16JUL07.doc
As always there are different aproaches and methods possible. With or without MAF, with or without wideband o2.....

Greetings.....Eugen




Eugen,

Thanks. That's exactly the type of information I was looking for.

[crash]

Rev2xs-The only thing that a higher octane fuel does is allow you to run more compression and/or more timing advance before detonation occurs. The notion that you could run a leaner mixture may be slightly true in that the leaner mixture could be run with a higher octane fuel before detonation occurs, due to the higher octane of the fuel, but you will not build more HP at this margin of running too lean. Most modern engines, like the LS, have knock sensors and the computer just retards the ignition if knock is present. That is why the LS engines run a relatively high compression ratio stock. The computer allows this by retarding the ignition to just below detonation levels. This also makes it so that you can run 87 or 91 in your car and not have any damage to the engine. 91 SHOULD make more power because more timing can be put into the ignition, but the factory computer should automatically take care of this issue of maximizing whatever fuel you are using. You CAN mess with these maps as well, but it can get expensive quickly if you map the knock retard scale wrong.

[rev2xs]

Hmmm, that is kinda what i was suspecting. In my case, its best left alone then. Especially if one doesnt know what one's doing...




Rev2xs-The only thing that a higher octane fuel does is allow you to run more compression and/or more timing advance before detonation occurs. The notion that you could run a leaner mixture may be slightly true in that the leaner mixture could be run with a higher octane fuel before detonation occurs, due to the higher octane of the fuel, but you will not build more HP at this margin of running too lean. Most modern engines, like the LS, have knock sensors and the computer just retards the ignition if knock is present. That is why the LS engines run a relatively high compression ratio stock. The computer allows this by retarding the ignition to just below detonation levels. This also makes it so that you can run 87 or 91 in your car and not have any damage to the engine. 91 SHOULD make more power because more timing can be put into the ignition, but the factory computer should automatically take care of this issue of maximizing whatever fuel you are using. You CAN mess with these maps as well, but it can get expensive quickly if you map the knock retard scale wrong.