PP2 Rev Hang

The tuner who did my PP2 install gave me a call this morning. He told me not to hold my breath for a new calibration from Ford, but that he can fix the cold rev hang issue. So I'll be dropping by there soon to have it done. Fingers crossed, but he seems to have a great deal of expertise in tuning.

So this is a tune separate from the PP2 tune?

I would like to know if this is cause by the PP2 tune. Have you had any other issues with the PP2 package ?

I have PP1 and have rev hang. I've gotten used to it. When I called FP early on they denied that it existed. When I'm driving on secondary roads in third gear around 3K rpm and let off the gas it hangs there at 3K for a few seconds. Maybe Jim's San Diego tuner can fix that for me.

carlos said:

I would like to know if this is cause by the PP2 tune. Have you had any other issues with the PP2 package ?

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He said he could change the PP2 calibration to eliminate the problem. I let the car warm up in the garage for five minutes today, and I didn't experience any rev hang.

The only other characteristic of the PP2 tune is the tendency of the throttle valve to close abruptly when I take my foot off the accelerator. It feels like I hit the brakes. He said this is desirable in a track car. When I shut it down in the garage with the windows open, I can hear the valve slam closed.

When do you plan to have this done? Can you please elaborate on the specifics of the "calibration' modification? Re-running some type of calibration or is he re-tuning the ecu?

Keith_PDX said:

When do you plan to have this done? Can you please elaborate on the specifics of the "calibration' modification? Re-running some type of calibration or is he re-tuning the ecu?

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I plan to have it done as soon as he has time - probably next week. First he wants to extract the ECU map and study it to determine the best way to go. I'll be sure to keep the forum updated. I also plan to have it dynoed just for grins.

Jim Bronson said:

I plan to have it done as soon as he has time - probably next week. First he wants to extract the ECU map and study it to determine the best way to go. I'll be sure to keep the forum updated. I also plan to have it dynoed just for grins.

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Good info and looking forward to results, also wondering if the map change will cause warranty issues.

It's probably CAUSED by the fact they used the GT350 TB on the stock intake manifold. It uses different electronics. If they supplied a different TB with a larger bore but the same electronics, I'm willing to bet the subsequent tune would be excellent.

wildcatgoal said:

It's probably CAUSED by the fact they used the GT350 TB on the stock intake manifold. It uses different electronics. If they supplied a different TB with a larger bore but the same electronics, I'm willing to bet the subsequent tune would be excellent.

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Your statement feels incomplete, please elaborate. You don't think Ford Performance calibrated the ecu and tune for the larger throttle body? That seems quite basic and unlikely that an engineering capable company would miss that or deem it unnecessary.

Jim Bronson said:

The tuner who did my PP2 install gave me a call this morning. He told me not to hold my breath for a new calibration from Ford, but that he can fix the cold rev hang issue. So I'll be dropping by there soon to have it done. Fingers crossed, but he seems to have a great deal of expertise in tuning.

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Oh come on now! The rev hang is only present when the car is cold and running in an open loop condition. Just back off a bit before shifting and keep it under 3000 rpms (which you should be doing anyway). Once it's warm and running in a closed loop, the rev hang is completely gone. I think that you're playing with fire by messing with the mapping!

I understand the symptom, and I'm going to have it fixed if I can. In the worst case, he can reinstall the stock PP2 tune.

wildcatgoal said:

It's probably CAUSED by the fact they used the GT350 TB on the stock intake manifold. It uses different electronics. If they supplied a different TB with a larger bore but the same electronics, I'm willing to bet the subsequent tune would be excellent.

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In that case the pp3 should not have any rev hang. opcorn:

Every tuner shys folks away from the GT350 TB because it is more difficult to tune. If Ford Performance could tune it, we wouldn't have needless rev hang. I took my kit off, got a different tune, and weird... zero issues.

The rev hang is more of a nuisance than an "issue".