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GPI SS3 cam 233* / 253* duration at 050 and .646" / .637" valve lift.

I have been using PPV flex fuel startup stuff including the FA1 table. Not sure how I got the offset numbers...they don't...

So this is interesting. I did my normal 30 minute shut down heat soak interval, but this time I opened the hood and put a small fan directly on the ECT sensor....

Normal/No Fan 30 min:

ECT...

No change, unfortunately. This is what I always run into. Cold and hot starts are seemingly unimpacted. Also, heat soaked starts are unimpacted. It is like nothing ever changes. :banghead:

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I am not sure how this will impact forced induction engines, however, for N/A engines the manifold volume is used as a basis for one of the inputs for the transient fueling calculation. This can be...

Wideband output added.

Results: not much changed. However, it is interesting to note that the 30 minute heat soak test did reveal a nice initial RPM spike up to 333 rpm right at the start of...

I have tried that. In fact the tune I uploaded called "hjtrbo 20 pct more FA1.hpt" has the MAF SS values set to 20 g/s and I increased the stepdown value as well.

With all the airflow changes I am...

Yeah I will have to crawl under the dash tomorrow to rewire it for constant power.

yep yep been there got the logs.

The OL tables are set up to mirror a 2012 Holden/Chevy PPV with the factor flex fuel, otherwise this car won't start on tastier blends of E.


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I tried this and it resulted in the worst results yet.

Again, this is not a high fuel pressure issue. This happens after pressure drops to normal and injector tip temp calculates higher.

I am...

The gauges on most vehicles are computer controlled dummy gauges designed to control the driver, not report accurate numbers. Trust the HPT scanner.

Yeah but that is not the issue. If I restart at 10 min (when pressure is 85 PSI) the car starts no problem. The problem is when I continue to wait (pressure drops to normal range, but tip temp...

I didn't check it with a gauge for cold starts.

Edit: after cranking is over and the engine is running it drops to 58-60 PSI as expected btw

For cammed N/A setups is there any general guidance on heat soaked restarts? The car starts great cold and hot (after an immediate shutdown). But once you let it sit for 30 min+ it takes a lot of...

It's overly complicated....but not too bad....
https://forum.hptuners.com/showthread.php?7621-LS2-Fan-Logic-or-lack-thereof&p=52393&viewfull=1#post52393

I was doing some experimenting and changed some of the prediction coefficients and now I would like to to change them back to stock (as seen in the screenshot), however, the OEM calibration exceeds...

What is your line of work exactly? Do you work with PSIG or PSIA? I believe that is the difference. Gen4 fuel systems are 58 PSIG (400 kPa).

Correct! A write entire using HPT from a compatible M6 CTSV file did the trick!

Thanks for sharing these...I see that two of these files does indeed have [ECM] 822 mapped.

Ok thanks. That was a shot in the dark as the cause. We're trying to source an M6 E67 now.

Yes that seems to be the issue alright.

I am curious though if ECM 822 is (usually) mapped on an M6 OS by HPT or if that is only a GMPP OS thing.

Just an FYI, we got the ECM and stabbed it in and the car fired up right away! Thank you edcmat-l1!!!

Now this has created a new issue in that the ECM is reading a constant 158 mph which is...

You can download the log file in this post for an example:...

Closed Loop = Stoich -> narrowband O2 sensors
Open Loop = Rich* -> wideband O2 sensor
*note an exception that after start up the car may be in OL before switching over to CL and the ECM is...

OK so it sounds like the other segments (unreachable by HPT) would need to updated. Hence SPS flash.

To be clear, we did not do a write entire from the GMPP source ECM. We did a read of the OEM ECM, made normal tuning changes in HPT (including disabling VATS), and then did a write entire. The GMPP...