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Thanks for the info - PM sent

I?m a little confused with the Jeep PCMs. I have a 2015 Jeep Wrangler Unlimited, and I?d like to get a spare PCM for tuning.

1) The GPEC2 is listed for the 2012-2014 Jeep Wranglers, and the...

Sounds interesting. In my opinion, $70 is overpriced for a 140 page book and $70 is overpriced for an electronic version. If you look at other GM tuning/engine building book prices, you will see...

When I said hover, I meant +/- 1.5% over all RPMs and engine load. If either extreme LTFT value is used for PE, I'm OK with a +/-1.5% uncertainty in my WOT A/F.

Only using STFTs is not unheard...

Hawk,

When I said hover, I meant +/- 1.5% over all RPMs and engine load. If either extreme LTFT value is used for PE, I'm OK with a +/-1.5% uncertainty in my WOT A/F.

Only using STFTs is not...

My LTFTs and STFTs hover very close to zero. So at PE, it is not an issue.

I'd recommend not to disable LTFTs. I added why in the link that Hawk provided.

I know this is kinda an old thread, but I was just referred to it. I'd recommend that you should be tuning to get your LTFTs and STFTs to be near zero everywhere. The issue I have with disabling...

Hawk,

Thanks for the info. My ltfts hover around zero. So this may not help me.

Hawk, why disable the Ltfts?

I have a 2006 Hummer H3 with an I5 and a 4-speed auto tranny. I would like to lock the torque converter in 3rd gear and in 4th gear for low throttle positions. Is there any harm if the tranny...

Here is another log. At 27:39 is when Strim2 goes to zero and when the DTC would have been set. I also logged the current firing cylinder. Because of the data acquisition rate, the current firing...

I have a 2004 Cadillac CTS 3.6L 60K miles. I'm getting P2234 - O2S Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 1. This is a wideband precat sensor on the driver's side.

In the...

Is there a way to smooth the transition out of DFCO for an 06 I5 H3. I can feel a bump when DFCO kicks out and the engine starts up again (with the torque converter locked). I still have the stock...

After you've tweaked your VE and MAF, your engine is calibrated to your wideband not to your precat O2's. As an exagerated example, if your Ltrims all converge to +10, this means that your precat...

You started this thread saying that your MAS has reached its limits. I'm trying to tell you that there is a re-calibrated MAF that may read 500 g/s and outputs 8,000 Hz where the stock MAF may read...

So having a MAF that has been rescaled to read to a higher airflow, be within ECM limits, and comes with a new calibration curve won't help you.

The simple solution for you is to use a new re-calibrated MAF from West Automotive Performance Engineering. You will get a new MAF calibration curve with the new MAF. This MAF can sense a much...

That tuning thread is pretty old. It seemed like they good results but no one got a tune from them. If you run 93 octane you can increase timing, but you have four timing tables to tweak. I'm just...

Honestly, I think your fuel saver fan is a restriction at high flow rates. I would remove the fan and redyno, or you can monitor MAF air flow rate as a function of engine RPM and run a test with and...

For me, I just had to buy the credits since I had the hardware. So it was worth it for me. I'm not sure I would buy hpt just for this engine. You can tweak timing, a/f, and valve timing. No tcm and...

My numbers and strategies were for an NA engine not the LNF engine.

Let's say my stock overlap is x degrees.

At idle, my overlap would be x - 0.4 degrees

At 2500 rpm my overlap would be x -...

The equations are based on specifying a cam based on the intake lobe ATDC and the exhaust lobe BTDC. The 20 in the denominator is made up of 2 times 10. The 10 factor converts the number in the cam...

This may help visualize what is happening from a traditional cam perspective:

I = intake cam angle from the table
E = exhaust cam angle from the table

Relative Lobe Separation:

(I - E)/20 =...

I think the overlap that you are calculating is the change in overlap about the base cam. The other parameter is the effective amount the cams are advanced or retarded.