"Does the HOM also runs rich?"
Yes but it?s been awhile since I?ve used it (weather and road conditions not conducive to racing or high boost runs) and I do not remember the values displayed on the wideband controller when I was using it, sorry.
?The piggyback is one solution - not sure how it works to trim fuel etc. The most common method is to trim the MAF, TPS or MAP sensors. They will all have other side effects at WOT, since the ECU is not going to see full WOT voltage etc.?
The Piggy back that I?m using is just that, a piggy back it does not replace the PCM it alters some of the sensor signals being sent or read by the PCM. The web site I linked to doesn?t go into details on what it does exactly to ?trim fuel?. If I?m not mistaken it alters the MAP signal. But it does this ?map clamping? in 3D (RPM, LOAD, TPS) versus a specific voltage clamp at high boost levels.
"Please outline your thoughts and how WI can replace the 10:1 afr."
The factory is dumping excess fuel to keep combustion temps low, which helps with engine life or limits them (DCX) to being vulnerable to warranty claims due to engine damage. By taking away some of the excess fuel using the Power Paq my power goes up but so does the risk of doing damage (if I go too far). If I can replace some of the excess fuel with WI, and introduce it in the right amounts, at the right time, I think I can keep the power I have tuned into the system already and keep the intended safety net that the factory had tuned for but did by dumping fuel. IMO I should be able to tune more aggressively, by reducing fuel dumping even more (but using my head and not getting too greedy) by further tuning the map in the PowerPaq with a wideband and EGT readings.
With race gas and the HOM switch enabled the car does make more power (proven to me by seat of the pants feel, others have been to the dyno and have seen the effects in black and white). I hope to be able to use the effects of WI to reduce the knock threshold, again by introducing it in way to reduce knock. The factory PCM is looking to see higher expected knock values when HOM activated. If it does, it allows more timing (significant to making more power). If not it overrides the switch and reverts to the non HOM settings. If I can get the system setup and tuned properly I think I can get the car to run with a higher knock value as if race gas is being used. This will allow me to run the car with the HOM switch activated at will and without using expensive race gas.
Right now this may sound like I want to do two separate things with the WI, but I think it?s doable if I do it right and knowledgeable people help/guide me. At worst I think I can keep the current Power Paq map, and just attack the HOM problem without fear of doing damage since my Power Paq tune, IMO is conservative.
?1) You are trimming the fuel by modifying the load sensor?
See above, if still not clear I can send user manual
?2) You will be creating a map for the WI to drive the 2C.?
Yes, I will be using the Power Paq to drive the 2C HSV. I will have a map specifically for my default tune but with WI. This way if have WI problem I can revert back for safety.
?3) HOM will automatically advance the ignition and boost on the stage II.?
See above, I think it?s better said that, it will allow more timing if it sees expected increased knock threshold values. I don?t think the HOM switch activation effects boost control. However the PCM in stage II has been calibrated for increased boost when WOT.
?4) You are already running bigger injectors on stage II upgrade? (part of the kit)?
Yes the injectors are larger and I think the factory sizing was in anticipation of the next stage as well (stage III), since I have stage II w/the toys option, the stage III upgrade for me from Mopar would not include larger injectors.
?I think your set up will work well with the 2c. I do have a question. Is the "map switch" on the Psi switchable on the fly if water injection is interrupted??
Example to switch from map A to map B: you have to shut off, then have key on and then toggle the map switch from map A to map B. So no, you can not switch between maps on the fly or have the maps controlled/loaded by something like a low fluid signal or clogged injector warning.
F.Y.I. I'm going to let some other SRT-4 users (also WI enthusiast?s) know about this thread so as to check my statements for accuracy. And maybe join in with comments.
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