Maf less tuning
01-30-2006, 08:49 AM
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Originally Posted by Vertigo
Will a mafless tune still allow the use of a dry kit?
01-30-2006, 09:19 AM
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Originally Posted by Vertigo
Will a mafless tune still allow the use of a dry kit?
The coolant fuel correction is a very easy way to do this. Then you just use a CTS tricker to access this area of the tune on-demand when you use your nitrous.
Here's a quick example:
You add 30% fuel correction to the 240*F range of the coolant/fueling table.
When you activate your nitrous, you provide the correct resistance to simulate 240*F on the coolant temp sensor circuit of your PCM. The PCM increases fueling.
Some tuning systems may let you use the IAT circuit as well.
Keep in mind that the spark advance can also be adjusted by this same means.
If you simply add fuel unconditionally (not on-demand) then obviously you'll be way too rich when not using the nitrous.
01-30-2006, 10:22 AM
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Interesting approach.
What do you use to program the LS1 computer?
What do you use to program the LS1 computer?
Originally Posted by white2001s10
Sure you can use a dry system. You'll just have to handle the fueling in the tune.
The coolant fuel correction is a very easy way to do this. Then you just use a CTS tricker to access this area of the tune on-demand when you use your nitrous.
Here's a quick example:
You add 30% fuel correction to the 240*F range of the coolant/fueling table.
When you activate your nitrous, you provide the correct resistance to simulate 240*F on the coolant temp sensor circuit of your PCM. The PCM increases fueling.
Some tuning systems may let you use the IAT circuit as well.
Keep in mind that the spark advance can also be adjusted by this same means.
If you simply add fuel unconditionally (not on-demand) then obviously you'll be way too rich when not using the nitrous.
The coolant fuel correction is a very easy way to do this. Then you just use a CTS tricker to access this area of the tune on-demand when you use your nitrous.
Here's a quick example:
You add 30% fuel correction to the 240*F range of the coolant/fueling table.
When you activate your nitrous, you provide the correct resistance to simulate 240*F on the coolant temp sensor circuit of your PCM. The PCM increases fueling.
Some tuning systems may let you use the IAT circuit as well.
Keep in mind that the spark advance can also be adjusted by this same means.
If you simply add fuel unconditionally (not on-demand) then obviously you'll be way too rich when not using the nitrous.
01-30-2006, 10:55 AM
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Originally Posted by white2001s10
Sure you can use a dry system. You'll just have to handle the fueling in the tune.
The coolant fuel correction is a very easy way to do this. Then you just use a CTS tricker to access this area of the tune on-demand when you use your nitrous.
Here's a quick example:
You add 30% fuel correction to the 240*F range of the coolant/fueling table.
When you activate your nitrous, you provide the correct resistance to simulate 240*F on the coolant temp sensor circuit of your PCM. The PCM increases fueling.
Some tuning systems may let you use the IAT circuit as well.
Keep in mind that the spark advance can also be adjusted by this same means.
If you simply add fuel unconditionally (not on-demand) then obviously you'll be way too rich when not using the nitrous.
The coolant fuel correction is a very easy way to do this. Then you just use a CTS tricker to access this area of the tune on-demand when you use your nitrous.
Here's a quick example:
You add 30% fuel correction to the 240*F range of the coolant/fueling table.
When you activate your nitrous, you provide the correct resistance to simulate 240*F on the coolant temp sensor circuit of your PCM. The PCM increases fueling.
Some tuning systems may let you use the IAT circuit as well.
Keep in mind that the spark advance can also be adjusted by this same means.
If you simply add fuel unconditionally (not on-demand) then obviously you'll be way too rich when not using the nitrous.
Sounds quite intense for my first nitrous kit! Mafless is the same as a speed density tune right?
01-30-2006, 11:04 AM
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Originally Posted by white2001s10
Sure you can use a dry system. You'll just have to handle the fueling in the tune.
The coolant fuel correction is a very easy way to do this. Then you just use a CTS tricker to access this area of the tune on-demand when you use your nitrous.
Here's a quick example:
You add 30% fuel correction to the 240*F range of the coolant/fueling table.
When you activate your nitrous, you provide the correct resistance to simulate 240*F on the coolant temp sensor circuit of your PCM. The PCM increases fueling.
Some tuning systems may let you use the IAT circuit as well.
Keep in mind that the spark advance can also be adjusted by this same means.
If you simply add fuel unconditionally (not on-demand) then obviously you'll be way too rich when not using the nitrous.
The coolant fuel correction is a very easy way to do this. Then you just use a CTS tricker to access this area of the tune on-demand when you use your nitrous.
Here's a quick example:
You add 30% fuel correction to the 240*F range of the coolant/fueling table.
When you activate your nitrous, you provide the correct resistance to simulate 240*F on the coolant temp sensor circuit of your PCM. The PCM increases fueling.
Some tuning systems may let you use the IAT circuit as well.
Keep in mind that the spark advance can also be adjusted by this same means.
If you simply add fuel unconditionally (not on-demand) then obviously you'll be way too rich when not using the nitrous.
.
Originally Posted by Vertigo
Sounds quite intense for my first nitrous kit! Mafless is the same as a speed density tune right?
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01-30-2006, 11:31 AM
#8
Never seen that aproach, also fast and a couple other stand alone units have a nitrous input that will change timing when armed, not sure if you can richen it up and have a seperate fuel table associated with this.
01-30-2006, 11:55 AM
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supposedly, the guys at efilive will soon have a custom operating system for the stock pcm that will allow dry nitrous with a speed density/mafless setup, just like the dfi and other standalone setups.
01-30-2006, 12:22 PM
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When the MAF is unhooked then you are running SD mode.
I've only owned Edit myself, but I know that's bottom of the barrel as far as tuning power/ease.
The CTS trick has worked well since the mid 90's.
Even before the convenience of a tricker box, one could use a DPDT switch and second sensor to add fueling.
Go through the drive-through at Rallies and get a free cup of ice-water, dunk coolant sensor #2 into the ice-water, then when you're ready to spray switch from sensor #1 to sensor #2. You just have to keep in mind the added spark advance.
Now that's really old-school. Primative, but works.
Having Edit or another tuning program makes it a more precise operation, and with a CTS tricker circuit (resistor or potenciometer) you don't need the ice-water or another sensor.
I've only owned Edit myself, but I know that's bottom of the barrel as far as tuning power/ease.
The CTS trick has worked well since the mid 90's.
Even before the convenience of a tricker box, one could use a DPDT switch and second sensor to add fueling.
Go through the drive-through at Rallies and get a free cup of ice-water, dunk coolant sensor #2 into the ice-water, then when you're ready to spray switch from sensor #1 to sensor #2. You just have to keep in mind the added spark advance.
Now that's really old-school. Primative, but works.
Having Edit or another tuning program makes it a more precise operation, and with a CTS tricker circuit (resistor or potenciometer) you don't need the ice-water or another sensor.
