ZR1 Meth tune opinions

[PDYoung]

I wasn't really interested on who did the pro-tune,just letting you know that Jeremy set mine up to give you an idea about where the gain might work for you since Jeremy has a lot of experience. My system is hooked into the MAF. I don't know a whole lot about tuning but i think my PE table was adjusted on mine also. I too have an E-Force,gald to hear to still looked new after the 3 years.

[schpenxel]

I found this about the code

http://www.performancetrucks.net/for...5/#post4863807

[ZO6_Bryan]

On mine I took some out of the VE table where the meth comes in to try to keep the AFR from dipping too much. It makes the VE table look weird but it works pretty consistently so I've been OK with it. My alky control kit is triggered by boost (not MAF), so that is why it works consistently

Looks like this tuner tried to do the same just via the MAF table instead of VE. I don't think that's a good way of doing it unless you're triggering the meth from the MAF sensor. Otherwise it's not consistent enough to work IMO

I would go back to stock TB and see if that helps

For that to work wouldn't you have to disable the MAF sensor
Isn't all the fueling based on the MAF sensor when you are at high rpm? Besides this pro tuner disabled speed density altogether.

[schpenxel]

I'm running speed density only, no MAF. Not uncommon on supercharged applications

Not saying you can't run the MAF.. just get the MAF based controller for the meth system at least

[ttz06vette]

Not sure which way the ZR1 throttle blade opens but I was having a similar problem in my Z06 with REP and limp modes. After changing out the throttle body sensor and gas pedal sensor to no avail, I tried mounting my nozzle below the TB vs. on the side. It fixed the problem. Not sure if I had turbulence or interference with the blade but I have heard a few others fixed this problem by doing this. I have my nozzle mounted in the coupler about 2-3 inches from the TB...your may be mounted differently.

[GHuggins]

Not sure which way the ZR1 throttle blade opens but I was having a similar problem in my Z06 with REP and limp modes. After changing out the throttle body sensor and gas pedal sensor to no avail, I tried mounting my nozzle below the TB vs. on the side. It fixed the problem. Not sure if I had turbulence or interference with the blade but I have heard a few others fixed this problem by doing this. I have my nozzle mounted in the coupler about 2-3 inches from the TB...your may be mounted differently.

This is actually an interesting point. The meth nozzle is only ever supposed to be mounted at either the 12 or 6 o'clock positions for equal distribution into the intake or blower... I think this is actually in the alky control instructions. Never heard of it causing TB codes, but heck if it's one thing I've learned over the years, it's that anything's possible... Still think it's the MAF, but? If your friend keeps this setup, he might want to talk to Schpenxel for his timing pulling safety device for meth kits... Of course with meth failure in his, it may just be so lean that it'll just spit and sputter from being so lean? I only ever setup meth systems to go 1 +/- .3 points richer than commanded when spraying, but that's me? I know there's plenty out there that run them really really rich with meth. I've never seen any benefit from doing this myself even with any added or removed timing from it?

[ZO6_Bryan]

I really just want to put the tune I had for him back in it and then tune it for the methanol. He invested a lot in that tune so he won't be happy about it. That dissonance thing you know. If you paid for it you feel like you want to use it.

[LSxpwrdZ]

Complete wrong way to go about pulling injector out to compensate for methanol injection. It is basically saying that there is less airflow entering the engine which screws with the airflow model which affects delivered engine torque as well as cylinder airmass for spark table lookups.

[schpenxel]

How would you do it?

[ZO6_Bryan]

Complete wrong way to go about pulling injector out to compensate for methanol injection. It is basically saying that there is less airflow entering the engine which screws with the airflow model which affects delivered engine torque as well as cylinder airmass for spark table lookups.

Exactly what I told him.

[Eaglegoat]

How would you do it?

The right way ;-)

[schpenxel]

Thank you for your insight

[LSxpwrdZ]

PE and/or BE. You simply command less fuel... reasoning? Because you know the airflow model you have constructed is the same or similar but you want less injector so command less. This way the airflow model stays consistent and "characterized". Some bigger setups with big twin nozzle setups I've done has gone down to as low as 1.00 Commanded lambda under boost to achieve desired actual AFR. You obviously wont be able to use your normal copy/paste error this way but it is the only way to keep consistent fueling (or as consistent as it can be).

Personally what I do now is leave it rich so if/when the meth kit fails there is still fuel there delivered from the injectors. On stock ECM the best method is to use DSteck's E85 tricker box to activate E85 content when the meth kit pressurizes which then gives you the ability to pull fuel and add timing with the safety of fail safe back to normal non meth injected mode if the meth kit doesn't pressurize.