HPtuners Question and Answer Thread

[ostmike]

Mike , sent you a pm that you never answered. I would like to know if you can make this happen on my charger? Thanks

replied

 

[Marcus170]

Hello, so i have a hellcat swap 300 that is tuned on hp tuner and my transmission broke so i put a new transmission in and changed the tcm to my old tcm. When i try to relearn the transmission it fails every time. Any suggestions?

 

[ostmike]

Hello, so i have a hellcat swap 300 that is tuned on hp tuner and my transmission broke so i put a new transmission in and changed the tcm to my old tcm. When i try to relearn the transmission it fails every time. Any suggestions?

I am going to need some more information. WHat year 300? What trans? Did you keep the stock PCM or swap it as well?

 

[HMBRGLR]

sub'd for future reading. i wanna learn this soooo much but seems like soooooooo much time is needed to dedicate to it

 

[jonx96]

sub'd for future reading. i wanna learn this soooo much but seems like soooooooo much time is needed to dedicate to it

just take everything one step at a time. Tuning for injectors just start researching just that one part. Do not do a search for how to tune a hellcat. Search for how to tune hemi injectors or hellcat injectors will get you close.

 

[ostmike]

sub'd for future reading. i wanna learn this soooo much but seems like soooooooo much time is needed to dedicate to it

A good place to start if you are not familiar with loading the software, datalogging, loading tunes etc. would be the "How to's" section of our Youtube channel under "Playlists". These are old, non-professional videos but they have helped our customers out quite a bit.

Subscribe to our YouTube Channel - OSTDyno

 

[HMBRGLR]

A good place to start if you are not familiar with loading the software, datalogging, loading tunes etc. would be the "How to's" section of our Youtube channel under "Playlists". These are old, non-professional videos but they have helped our customers out quite a bit.

Subscribe to our YouTube Channel - OSTDyno

thank you for suggestion. im pretty sure i kno that but im trying to look into as totally fresh brand new eyes to absorb alllll the information

 

[fumanchu182]

This might be in the weeds as we say but I am referencing

"[ECM] 44442 - FA WOT Pedal: Above this pedal voltage, the fueling algorithm considers the pedal to be a WOT request."



and

"[ECM] 35059 - WOT Override Throttle Setpoint: Throttle setpoint used when WOT is commanded and WOT override is enabled."



Which one of these has priority? I have seen in my logs that the Throttle is at wot, the pedal is at 2.2 volts (approximately 50%) and no fuel enrichment is occurring. The FA Enrich is at 0.000 and as soon as the throttle blitzes past 2.5 it adds fuel in a ramp. However the car is very unhappy till then (making 14psi of boost). I have compared the Override values from a Demon and they solve this by adding in lower values for an override.



The car does not run lean (thank god) but it is also not enriched. In your tuning wisdom have you come across this? Additionally are there any semantic differences or dangers from switching this flag to IAT?


([ECM] 44650 - IAT Spark Select: Selects IAT or Manifold Air Temp for IAT Spark calculations.)

 

[16GoManGoHC2]

This might be in the weeds as we say but I am referencing

"[ECM] 44442 - FA WOT Pedal: Above this pedal voltage, the fueling algorithm considers the pedal to be a WOT request."

View attachment 115215

and

"[ECM] 35059 - WOT Override Throttle Setpoint: Throttle setpoint used when WOT is commanded and WOT override is enabled."

View attachment 115216

Which one of these has priority? I have seen in my logs that the Throttle is at wot, the pedal is at 2.2 volts (approximately 50%) and no fuel enrichment is occurring. The FA Enrich is at 0.000 and as soon as the throttle blitzes past 2.5 it adds fuel in a ramp. However the car is very unhappy till then (making 14psi of boost). I have compared the Override values from a Demon and they solve this by adding in lower values for an override.

View attachment 115218

The car does not run lean (thank god) but it is also not enriched. In your tuning wisdom have you come across this? Additionally are there any semantic differences or dangers from switching this flag to IAT?

View attachment 115219
([ECM] 44650 - IAT Spark Select: Selects IAT or Manifold Air Temp for IAT Spark calculations.)

Good questions. On the last question IAT SPARK SELECT, I would stick with MAT, it’s what the engine is ingesting.

 

[ostmike]

This might be in the weeds as we say but I am referencing

"[ECM] 44442 - FA WOT Pedal: Above this pedal voltage, the fueling algorithm considers the pedal to be a WOT request."

View attachment 115215

and

"[ECM] 35059 - WOT Override Throttle Setpoint: Throttle setpoint used when WOT is commanded and WOT override is enabled."

View attachment 115216

Which one of these has priority? I have seen in my logs that the Throttle is at wot, the pedal is at 2.2 volts (approximately 50%) and no fuel enrichment is occurring. The FA Enrich is at 0.000 and as soon as the throttle blitzes past 2.5 it adds fuel in a ramp. However the car is very unhappy till then (making 14psi of boost). I have compared the Override values from a Demon and they solve this by adding in lower values for an override.

View attachment 115218

The car does not run lean (thank god) but it is also not enriched. In your tuning wisdom have you come across this? Additionally are there any semantic differences or dangers from switching this flag to IAT?

View attachment 115219
([ECM] 44650 - IAT Spark Select: Selects IAT or Manifold Air Temp for IAT Spark calculations.)

I use ECM44443 to control when FA Enrichment (PE) occurs. I use ECM44389 to impact throttle opening rate. I am not sure what ECM35059 does for sure but I assume it is a limiter on ECM44389 so I set it out of the way (if it isn't already set that way from the factory).

So if I am understanding your question correctly it is not a matter of priority. One controls when PE occurs and the other limits the throttle opening. If slowing down your throttle opening makes the car run better then you most likely need to review the fueling programming in your calibration. Keep in mind that when you are running the black key you will have NO power enrichment at WOT even in boost. With the black key the bypass will limit boost but it will still be in boost at WOT with NO PE and the vehicle runs well like this from the factory.

Concerning the IAT question - I have not had the need to alter the factory setting of MAT so I have no information to share.

 

[AlleyCat]

Mike,
Where in the tune can I desensitize the misfire for the engine? What should I set it at with your demon cam and about 18 pounds of boost?
Alan

 

[ostmike]

Mike,
Where in the tune can I desensitize the misfire for the engine? What should I set it at with your demon cam and about 18 pounds of boost?
Alan

The Demon cam should not need any misfire settings modified.
If you are running the Demon Plus cam I would start with setting the Engine Diagnostics/Misfire/Detection RPM higher than any RPM you will be running. If you continue to have misfire warnings I recommend talking to your tuner since he/she may disagree with my recommendations for the next steps.

 

[AlleyCat]

Mike,
IN the cold my E85 does not like to fire up. Yes, it gets cold in Tucson.
Which tables may help with that and what should I set them at?
Thanks

 

[ostmike]

Mike,
IN the cold my E85 does not like to fire up. Yes, it gets cold in Tucson.
Which tables may help with that and what should I set them at?
Thanks

The main table that will impact cold start is Startup Inj PW. There is certainly more involved in getting a car to start and stay running in cold weather on ethanol but that is where I start. I can't advise on "what should I set them at" since this will be dependent on the injectors you are running, ethanol content, engine modifications, fuel system etc. Talk to your tuner. If they are experienced enough with ethanol tuning they should be able to get you squared away pretty quickly.

If you spend enough time on it you can get these results:

 

[AlleyCat]

To soften up the tune for the first 60 feet at the drag strip what should be changed in the tune? Wot base timing? Put to zero up to 3800 rpm?

 

[Demoniccat]

Very cool that you’re spending time to do Q&A with the users of this platform.

 

[ostmike]

To soften up the tune for the first 60 feet at the drag strip what should be changed in the tune? Wot base timing? Put to zero up to 3800 rpm?

There is an easy way (and much more effective than what you are suggesting) to do this and is a question for your tuner. If your tuner is unable to assist please feel free to contact me for tuning.

 

[Speedy!]

Mike made these adjustments to my car at ChallengerFest one year and I picked up 3/10 on the next pass. Pretty cool stuff.

 

[jonx96]

Agreed. Even tho I didn’t feel spinning I made the change I assume Mike is referring to. I went from cutting a 1.28 to a 1.25 and 1.26 on the next two passes.

 

[Unholy707]

Super secret settings 😉