Custom tunes at Altitude

[travisunderwood]

I have a 99 F250 Superduty 7.3 - running Gryphon with custom 80tow / 80daily and live in the mountains at Colorado over 7000feet. I have had excessing smoking while driving above 7000 feet with both 80 daily and tow and Bill did a tweak for me which worked great as I drove from Wisconsin back to Colorado. No smoking under load, improved MPG and performance. As I left Denver (at 5000 feet) and went higher the smoke started being noticeable. I do not like driving around belching smoke out all the time, so I switched it back to stock tune and no smoke.

Anyone else running custom PHP tunes at altitude and able to drive normally without belching smoke all the time?

Truck has high flow intake and 4inch exhaust.

I have also emailed Bill, but wanted to see if any other users have experience.

Thanks
Travis

[Jackpine]

Originally Posted by travisunderwood

I have a 99 F250 Superduty 7.3 - running Gryphon with custom 80tow / 80daily and live in the mountains at Colorado over 7000feet. I have had excessing smoking while driving above 7000 feet with both 80 daily and tow and Bill did a tweak for me which worked great as I drove from Wisconsin back to Colorado. No smoking under load, improved MPG and performance. As I left Denver (at 5000 feet) and went higher the smoke started being noticeable. I do not like driving around belching smoke out all the time, so I switched it back to stock tune and no smoke.

Anyone else running custom PHP tunes at altitude and able to drive normally without belching smoke all the time?

Truck has high flow intake and 4inch exhaust.

I have also emailed Bill, but wanted to see if any other users have experience.

Thanks
Travis

I'm far from being an expert on diesel A/F mixtures, but it sure sounds like you're running rich at altitude, which is the standard problem in that environment. Sounds almost like you need a separate high-altitude tune. But, I would have thought the MAF sensor could keep things balanced - it seems to work for gassers.

- Jack

[travisunderwood]

Originally Posted by JackandJanet

I'm far from being an expert on diesel A/F mixtures, but it sure sounds like you're running rich at altitude, which is the standard problem in that environment. Sounds almost like you need a separate high-altitude tune. But, I would have thought the MAF sensor could keep things balanced - it seems to work for gassers.

- Jack

Yup, I asked Bill about that. We will see. I am not sure if it was really a 'test' but I switched back to the stock tune just to see if there was the same issue which would of been a sensor/computer issue - but issue went away.

[cleatus12r]

Close enough, Jack.

But the 7.3L doesn't use a Mass Air Flow Sensor.

For all intents and purposes, an 80HP tune is going to add a lot of fuel above stock and there is simply not enough air density to support that much fuel while towing.

I would suggest a lower HP towing tune.

[travisunderwood]

Originally Posted by cleatus12r

Close enough, Jack.

But the 7.3L doesn't use a Mass Air Flow Sensor.

For all intents and purposes, an 80HP tune is going to add a lot of fuel above stock and there is simply not enough air density to support that much fuel while towing.

I would suggest a lower HP towing tune.

Makes sense. I don't tow that much, so 80 daily had been planned as my primary - and the one I have been using. 80 Tow looks like a smoke show, only tried it once. What tune should I go with to maximize MPG - that is my end goal is maximizing MPG over stock, not looking for best performance.

[cleatus12r]

Originally Posted by travisunderwood

Makes sense. I don't tow that much, so 80 daily had been planned as my primary - and the one I have been using. 80 Tow looks like a smoke show, only tried it once. What tune should I go with to maximize MPG - that is my end goal is maximizing MPG over stock, not looking for best performance.

If your permanent residence is located at high altitude, I'd probably stay at a 40HP or so for towing.

My reasons for recommending 40HP Towing are as follows:

1. No excessive over-fueling. Towing power will increase but will not dump unnecessary fuel into the engine.

2. No excessive over-fueling. Less fuel will require less air.


3. Mileage will increase over current 80 HP tune due to the reasons above.

[Jackpine]

Originally Posted by cleatus12r

Close enough, Jack.

But the 7.3L doesn't use a Mass Air Flow Sensor.

For all intents and purposes, an 80HP tune is going to add a lot of fuel above stock and there is simply not enough air density to support that much fuel while towing.

I would suggest a lower HP towing tune.

Oh well, as I just read: "Some days you're the bug; some days you're the
windshield."

Guess this was my day to be the bug.

- Jack

[cleatus12r]

Originally Posted by JackandJanet

Oh well, as I just read: "Some days you're the bug; some days you're the
windshield."

Guess this was my day to be the bug.

- Jack

That's ok. You are forgiven this time.

You know, there's a reason I don't help with the Gryphon (CS/CTS included) stuff......I'm the bug.

[Blowby]

Travis, I have been running in CO for many years with big injectors and I agree that up above Denver the fueling per air is a challenge. I have developed quite a few tunes for this issue using PHP software but I don't know if I can help with the module you have. It's all in the programing if your truck is functioning properly. So to answer your question a custom tune from PHP will solve your problems.