Quick run-down of the combo:
1981 Caprice Classic
2004 4.8L (Bone stock aside from valve springs and Comp's Smallest Thumpr Cam)
Holley Modular Mid-Rise with 90mm Throttle Body
2004 4L80E Manually Shifted (TCI Valve Body with Transbrake)
Single Garrett 70mm Turbo
Turbonetics RG45 Waste Gate
Versafueler & 120lb Low Impedance Injectors
Holley Dominator Twin Fuel Pump
Holley Billet Regulator
-10 Feed -8 Return
Here is where I'm at as of now...
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I am at the point of the project where I need to build a harness and choose a PCM.
I already have a 2004 GTO PCM which is the direction I am leaning towards.
I definitely want to run E85.
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Now given the information above, I am looking for some help!
2004 GTO PCM: Does anyone see any reason NOT to run this PCM for my combo? Is there a better GenIII unit I should be looking for that would offer any additional control/ fine tuning? Since I will be pinning a harness from scratch...if I am going to jump ship on the PCM, now is the time to do it!
Map Sensor & OS Upgrade: For my application, I don't see myself running more then 15lbs of boost. I suppose its a possibility, but I don't think the motor would be able to handle it anyways. As for a map sensor, I know I can use my 3-bar with the 2-bar OS...but what about resolution? I understand you loose some of the resolution by going with the 3bar enhancement....is it that noticeable for tuning? Given my combination, which version of the OS enhancement am I better suited to run?
E85 Tuning: I have read several different perspectives and versions of tuning....overall it seems basically the same as I was doing before on pump gas. Load a custom PID to monitor AFR % Er and adjust the tables accordingly....what really changes when starting fresh on E85? How should I setup my stoich values? How do I even calculate a safe base map given my cam and fuel choice to even get the car started? I am a little lost here with my base tune as I have never started with something so far off from stock.
Custom PID: I am not running the pro version of HP tuners, so my wideband will be processed through the AC pressure switch. Does anyone have a custom PID for the AFR % Err on e85, or is it the same PID as I was using for pump gas?
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Thanks in advance for any help!