Need assistance with LB7 tune
04-24-2013, 01:08 AM
#1
Need assistance with LB7 tune
I am using Hptuners to tune a LB7 truck and have realized they are quite different form the 05+ trucks which have much better guides availible. Is anyone out there available to help me figure a couple small things out? I am specifically needing help determining which cells to increase on the pulse width tables and how to adjust the speedo for 35's.
04-28-2013, 08:49 PM
#4
He has got the banks bighead for the boost, plus the adjustments to the fuel and boost tables I made. I adjusted the timing but couldn't ever get the speedo fixed. The tire calculator page was blank and I was afraid of messing with the vss settings.
04-29-2013, 07:05 PM
#6
To adjust for different tire size you have to take some measurements and do some math.
First we need to get a measurement of the circumference of the tire.
I like to do it while on the truck. get the tire at the correct pressure and at operating temperature, then on flat level pavement mark the pavement next to the centerline of the tire and continue the mark up onto the side wall of the tire.
Roll the tire one full revolution, make a new mark from the tire where you place first mark and continue it down onto the pavement.
Now measure the distance from the first mark on pavement to the second mark on the pavement, this is your tire roll-out.
Now some math.
One mile is equal to 63,360 inches, divide 63,360 by your tire roll-out. This is how many revolutions the tire makes in one mile.
Now start VCM Editor, open the file you wish to modify, the go Speedo/General you should see this(see attachment)
The two red circles are the boxes to modify, the VSS Tire Revs per is where you put your first calculation.
Now for next calculations, take your tire revs per value and multiply it by final drive ratio(3.73 in this case) then multiply this by the Rev-Trans value (40 in this case), put that value in the other circled box. Round the value if needed.
This should be very close you can double check with GPS.
First we need to get a measurement of the circumference of the tire.
I like to do it while on the truck. get the tire at the correct pressure and at operating temperature, then on flat level pavement mark the pavement next to the centerline of the tire and continue the mark up onto the side wall of the tire.
Roll the tire one full revolution, make a new mark from the tire where you place first mark and continue it down onto the pavement.
Now measure the distance from the first mark on pavement to the second mark on the pavement, this is your tire roll-out.
Now some math.
One mile is equal to 63,360 inches, divide 63,360 by your tire roll-out. This is how many revolutions the tire makes in one mile.
Now start VCM Editor, open the file you wish to modify, the go Speedo/General you should see this(see attachment)
The two red circles are the boxes to modify, the VSS Tire Revs per is where you put your first calculation.
Now for next calculations, take your tire revs per value and multiply it by final drive ratio(3.73 in this case) then multiply this by the Rev-Trans value (40 in this case), put that value in the other circled box. Round the value if needed.
This should be very close you can double check with GPS.
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