SC - Nitrous - Tuning
10-22-2005, 09:52 PM
#1
SC - Nitrous - Tuning
Hey Guys,
I, like a couple others, am toying with the idea of spraying through my radix. Guess the easiest route would be to go with a wet kit and tune.... most likely the tune would remove timing at WOT and adjust the fueling, probably down? , as I'm guessing the default for a NOS solenoid would be to run extra rich with fuel. Could possibly adjust with pills on the fuel side and not have to change the WOT fueling in the tune? I wouldn't want to spray all the time so then my tuning wouldn't be right unless I'm spraying. Guess I could have the two tunes and just load the NOS tune when I'm ready to spray. Anyway I don't like these options.
Guess where I am going with this is back to a dry shot. I've read that there are fueling tables the PCM will default to should it detect the MAF gone bad. Think it would be possible to wire the nitrous kit such that it would also disable the MAF and trick the PCM into using this table when its armed. Tune this table for you nitrous runs. Perhaps also kicking in a fuel pump voltage booster for more fuel. Question then would be the timing. I've not read about any default timing tables the PCM will fall to should a sensor fail? Anybody ever hear of such things?
Sorry If I'm rambling. Needing to take on another project
I, like a couple others, am toying with the idea of spraying through my radix. Guess the easiest route would be to go with a wet kit and tune.... most likely the tune would remove timing at WOT and adjust the fueling, probably down? , as I'm guessing the default for a NOS solenoid would be to run extra rich with fuel. Could possibly adjust with pills on the fuel side and not have to change the WOT fueling in the tune? I wouldn't want to spray all the time so then my tuning wouldn't be right unless I'm spraying. Guess I could have the two tunes and just load the NOS tune when I'm ready to spray. Anyway I don't like these options.
Guess where I am going with this is back to a dry shot. I've read that there are fueling tables the PCM will default to should it detect the MAF gone bad. Think it would be possible to wire the nitrous kit such that it would also disable the MAF and trick the PCM into using this table when its armed. Tune this table for you nitrous runs. Perhaps also kicking in a fuel pump voltage booster for more fuel. Question then would be the timing. I've not read about any default timing tables the PCM will fall to should a sensor fail? Anybody ever hear of such things?
Sorry If I'm rambling. Needing to take on another project
10-22-2005, 11:44 PM
#2
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You could just get a timing tuner from full throttle . How does the truck run with spray? I just hooked mine up but am waiting for a new fuel pump first and have almost 10 psi.
10-23-2005, 08:41 AM
#3
Originally Posted by BlownChevySS
You could just get a timing tuner from full throttle . How does the truck run with spray? I just hooked mine up but am waiting for a new fuel pump first and have almost 10 psi.
I haven't put the NOS on yet. Don't even have the parts. In my planning stages. Still haven't found a workable solution to spraying. Ideal would be a direct port, which I don't think will fit a radix, and a dual tune that you don't have to physically switch out.
10-23-2005, 12:19 PM
#5
Originally Posted by jerome
just do a tune with the normal stuff and then nitrous tune when tow/haul is pressed
Your comment did get me into looking at the tables. There is a high octane and low octane spark advance table. Anybody know how these 2 tables are used? Now have the possiblility of using a timing and fuel table and timing table for nitrous?
10-23-2005, 05:05 PM
#6
I've done a little more research. Seems that if you were to tie into the maf with the arming switch for your NOS system, disabling it when you arm your NOS you can tune two tables in the PCM for your nitrous system the two major things, timing and fuel.
MAIN SPARK Advance - LOW OCTANE.
From the help section of HP Tuners
" If the engine has been operating for a moderate time without any Knock Retard then Knock Learn is zero and the interpolation favors the High Octane table, if Knock has been detected then the interpolation will move towards the Low Octane table. During MAF failure the Knock Learn is set to maximum and the Low Octane table is used. "
The PCM will also revert to the PRIMARY VE table which I think you could use to help tune fueling. I'm thinking this can be done with a dry system.... Arm your system. It disconnects the MAF. The PCM then reverts to the Low Octane table which you can tune for the right timing. At the same time you've rigged a fuel pump booster to come in at WOT for the extra fuel, coupled with Primary VE table tuning , surely you could tune the right fueling somewhere in all this?
MAIN SPARK Advance - LOW OCTANE.
From the help section of HP Tuners
" If the engine has been operating for a moderate time without any Knock Retard then Knock Learn is zero and the interpolation favors the High Octane table, if Knock has been detected then the interpolation will move towards the Low Octane table. During MAF failure the Knock Learn is set to maximum and the Low Octane table is used. "
The PCM will also revert to the PRIMARY VE table which I think you could use to help tune fueling. I'm thinking this can be done with a dry system.... Arm your system. It disconnects the MAF. The PCM then reverts to the Low Octane table which you can tune for the right timing. At the same time you've rigged a fuel pump booster to come in at WOT for the extra fuel, coupled with Primary VE table tuning , surely you could tune the right fueling somewhere in all this?
10-23-2005, 07:29 PM
#7
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Well, my MAF is before where I have the nozzle in my intake. It comes right after my airbox with the radix. So the nos doesn't go through my sensor. Pics would help too.
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10-23-2005, 09:02 PM
#8
Originally Posted by BlownChevySS
Well, my MAF is before where I have the nozzle in my intake. It comes right after my airbox with the radix. So the nos doesn't go through my sensor. Pics would help too.
Sorry I don't have any pictures. Don't even have a kit to install.
My install would be just like you are doing except a dry shot. I'm trying to start a discussion on alternative ways to do a dry shot on the radix, besides spraying before the MAF and allowing the PCM to add fuel. I'm still wary of introducing fuel into the SC. All the talk of puddling, backfires, and possibly eating at the screw coatings. A way that will allow the truck to run at a proper tune and safe wheter I'm spraying or not. I'm hoping somebody a lot more in the know than I will jump in and say that I'm either and idiot or that my ideas might work.
10-24-2005, 12:39 AM
#10
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get direct port through injector bungs...
http://www.nitrousexpress.com/Pages/LS1NXL.htm
maybe that will work with radix?
http://www.nitrousexpress.com/Pages/LS1NXL.htm
maybe that will work with radix?