When tuning your car and you have a happy knob

[The Broken Regal]

Don't leave the happy knob on the *C that the ambient air temp is outside because in my case, you will end up getting 8* kr on a 3.2 pulley with a full size IC with the engine STILL commanding 20* timing

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Click to read more...

 

[02BlueGT]

Did anything blow?

 

[Angus]

in layman mustang owner terms plz. thanks. lol

 

[The Broken Regal]

no, thankfully... i was looking at the scan and trying to figure out how my 02s are at 925, ltfts locking in exactly at 0 and timing @ 20 yet my KR is out the ass

 

[02BlueGT]

in layman mustang owner terms plz. thanks. lol

thiz be the 3800 section yo.....

In the pcm on our cars, there is a table that adds or retards timing based on the intake air temp sensor(it is a basic thermistor) we change those settings so specific temps add the amounts of timing we like, them replace the IAT sensor with a poteentiometer (a variable resistor) to add or subtract timing on the fly....

He had pluged in his IAT with the happy knob table in the pcm still, thus too much timing....


I think it can affect fueling too

 

[The Broken Regal]

in layman mustang owner terms plz. thanks. lol

with the happy knob, you basically have a table/chart where you can preset timing adjustment.... you have a knob somewhere in/on the car, some have it in their gauge-pod cluster, mine is under the hood... and it tricks the car into having a specific IAT and then you insert you positive or negative spark values

like for instance, when i set my knob to 0*C, when I'm above 50% throttle, the knob causes the pcm to command an additional 10* spark over stock

then you spread it out over a -10C,0,10,20,30,40,50,60,70*C values and like my 40 values are 0 which means when i set it at 40, my WOT timing is stock

like when I was at the track day or if I was running 100octane i might adjust it to 30 and bump up timing by 4* if i wanted to

it really helps if its hot out and you want to back off on timing rather than get kr and have the car do it for you the bad way lol

 

[02BlueGT]

no, thankfully... i was looking at the scan and trying to figure out how my 02s are at 925, ltfts locking in exactly at 0 and timing @ 20 yet my KR is out the ass

Good that nothing broke

Edit: and i beat your explanation heavykevy

 

[The Broken Regal]

thiz be the 3800 section yo.....

In the pcm on our cars, there is a table that adds or retards timing based on the intake air temp sensor(it is a basic thermistor) we change those settings so specific temps add the amounts of timing we like, them replace the IAT sensor with a poteentiometer (a variable resistor) to add or subtract timing on the fly....

He had pluged in his IAT with the happy knob table in the pcm still, thus too much timing....


I think it can affect fueling too

afaik its only timing adjustments, but it might be different with HPtuners... im on oldschool powrtuner hah

 

[02BlueGT]

I haven't played with at the iat tables so much, as I seem to stay in the no + or - areas

 

[The Broken Regal]

Good that nothing broke

Edit: and i beat your explanation heavykevy

phh my will be easier for the caveman driving the mustang to understand

but yea, next is tuning for gas mileage, these 3.69s are killing me

cant wait to see the cruise timing you can get with the IC lol

 

[02BlueGT]

I run 48....at cruise, but over 60 puts a little more load and i end up with 42-44 all the way up to 75mph( i know it isn't speed related, but the cylinder airmass is load related, and speed changes the load)

 

[Angus]

phh my will be easier for the caveman driving the mustang to understand l

im not a caveman, i just live under a rock.

and thanks for splannin'

 

[The Broken Regal]

lol @ sig aaron

 

[02BlueGT]

lol @ sig aaron