A6 with 3.7 diff gears problem

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February 25th, 2009
Tre-Cool

A6 with 3.7 diff gears problem

Hello, my car has a 3.7 diff gear and the engine tune has been modified to correct the speedo on the dash, however no matter what i change in the auto calibration the speed being logged via efilive is around 28% (more) out of what the dash is showing.

As such all the VSS and RPM shift points have to be calculated off this 28% outage.

For example:
1st to 2nd change: Cal = 60kph.
Actual speed shift changes at is around: 46kph
5th to 6th: cal = 96kph
actual speed = 80kph

Is this a known problem with the A6 calibrations? coz it makes it hard when trying to log the auto and to perfect shift time for the drags.

I want to get this working properly as i have a circle'd 3500 stall coming for it.

LABELS Gear Change
TPS . 1->2 2->3 3->4 4->5 5->6 2->1 3->2 4->3 5->4 6->5
0 44.000000 94.000000 153.000000 211.000000 511.000000 40.000000 89.000000 147.000000 205.000000 506.000000
100 44.000000 94.000000 153.000000 211.000000 511.000000 40.000000 89.000000 147.000000 205.000000 506.000000
February 25th, 2009
Chuck CoW

Call me.....

Quote:

Originally Posted by Tre-Cool

Hello, my car has a 3.7 diff gear and the engine tune has been modified to correct the speedo on the dash, however no matter what i change in the auto calibration the speed being logged via efilive is around 28% (more) out of what the dash is showing.

As such all the VSS and RPM shift points have to be calculated off this 28% outage.

For example:
1st to 2nd change: Cal = 60kph.
Actual speed shift changes at is around: 46kph
5th to 6th: cal = 96kph
actual speed = 80kph

Is this a known problem with the A6 calibrations? coz it makes it hard when trying to log the auto and to perfect shift time for the drags.

I want to get this working properly as i have a circle'd 3500 stall coming for it.

Would prefer to email tune to efilive than post on forum.

Hey man... Call me.

Chuck CoW
February 25th, 2009
gmh308

Quote:

Originally Posted by Tre-Cool

Hello, my car has a 3.7 diff gear and the engine tune has been modified to correct the speedo on the dash, however no matter what i change in the auto calibration the speed being logged via efilive is around 28% (more) out of what the dash is showing.

As such all the VSS and RPM shift points have to be calculated off this 28% outage.

For example:
1st to 2nd change: Cal = 60kph.
Actual speed shift changes at is around: 46kph
5th to 6th: cal = 96kph
actual speed = 80kph

Is this a known problem with the A6 calibrations? coz it makes it hard when trying to log the auto and to perfect shift time for the drags.

I want to get this working properly as i have a circle'd 3500 stall coming for it.

Would prefer to email tune to efilive than post on forum.

Did you change the trans speedo segment too?
February 25th, 2009
Redline Motorsports

I wish EFI Live would finally address the transmission speedo issue that have been going on for 4 years! Not quite sure why getting a speedo calibration to work is not a priority to a properly functioning software.....

You ever have an issue with that Chuck.................:doh2:
February 25th, 2009
Tre-Cool

Quote:

Originally Posted by gmh308

Did you change the trans speedo segment too?

yeah, but it makes no difference what you set the values too. logging speed is still out of whack.

These are the current TCM values.
LABELS Vehicle Speed Sensor Pulses per Revolution
Parameters Value
{H0101} Vehicle Speed Sensor Pulses per Kilometer 24777.168593 Pulses/Km
{H0102} Vehicle Speed Sensor Pulses per Revolution 36.000000 .
{H0103} Final Drive Ratio 2.900024 Ratio
{H0136} Tire Revolutions Per Kilometer 468.000000 Revs/Km

this is from the ecm.
LABELS Non Driven Wheel Pulses Per Rev
Parameters Value
{H0101} Vehicle Speed Sensor Pulses per Kilometer 24777.168593 Pulses/Km
{H0102} Vehicle Speed Sensor Pulses per Revolution 36.000000 .
{H0104} Trans Output Shaft Revs/Kilometer 468.484435 Revs/Km
{H0135} Tire Size Correction 0.000000 Factor
{H0136} Tire Revolutions Per Kilometer 468.468750 Revs/Km
{H0139} Driven Wheel Rolling Circumference 2090.000000 mm
{H0140} Non Driven Wheel Rolling Circumference 2090.000000 mm
{H0152} Driven Wheel Pulses Per Rev 48.000000 .
{H0153} Non Driven Wheel Pulses Per Rev 48.000000 .
{H0159} Vehicle Speed Output Signal Yes
LABELS Final Drive Ratio
Parameters Value
{H0103} Final Drive Ratio 3.729980 Ratio
{H0120} Final Chain Ratio 1.000000 Ratio
{H0121} 4WD Low Ratio 2.000000 Ratio
{H0122} Axle Ratio 3.729980 Ratio
{H0123} 2 Speed Axle Low Ratio 2.000000 Ratio
{H0125} Front Axle Drive Ratio 3.000000 Ratio

I sent both the ecm and tcm tune to blacky last night so hopefully he might have a fix for me.

Obviously you can see i have 2.90 ratio in for the tcm but that's because it didnt make any difference to the true speed during logging. i just left on the stock setting.
February 25th, 2009
gmh308

Dont know what size your tyres are, but the PPK seems to be incorrect. Would've expected something more like 60-70k.

It is a VE right? Speedo handled very differently in VE. :shock:

Quote:

Originally Posted by Tre-Cool

yeah, but it makes no difference what you set the values too. logging speed is still out of whack.

These are the current TCM values.
LABELS Vehicle Speed Sensor Pulses per Revolution
Parameters Value
{H0101} Vehicle Speed Sensor Pulses per Kilometer 24777.168593 Pulses/Km
{H0102} Vehicle Speed Sensor Pulses per Revolution 36.000000 .
{H0103} Final Drive Ratio 2.900024 Ratio
{H0136} Tire Revolutions Per Kilometer 468.000000 Revs/Km

this is from the ecm.
LABELS Non Driven Wheel Pulses Per Rev
Parameters Value
{H0101} Vehicle Speed Sensor Pulses per Kilometer 24777.168593 Pulses/Km
{H0102} Vehicle Speed Sensor Pulses per Revolution 36.000000 .
{H0104} Trans Output Shaft Revs/Kilometer 468.484435 Revs/Km
{H0135} Tire Size Correction 0.000000 Factor
{H0136} Tire Revolutions Per Kilometer 468.468750 Revs/Km
{H0139} Driven Wheel Rolling Circumference 2090.000000 mm
{H0140} Non Driven Wheel Rolling Circumference 2090.000000 mm
{H0152} Driven Wheel Pulses Per Rev 48.000000 .
{H0153} Non Driven Wheel Pulses Per Rev 48.000000 .
{H0159} Vehicle Speed Output Signal Yes
LABELS Final Drive Ratio
Parameters Value
{H0103} Final Drive Ratio 3.729980 Ratio
{H0120} Final Chain Ratio 1.000000 Ratio
{H0121} 4WD Low Ratio 2.000000 Ratio
{H0122} Axle Ratio 3.729980 Ratio
{H0123} 2 Speed Axle Low Ratio 2.000000 Ratio
{H0125} Front Axle Drive Ratio 3.000000 Ratio

I sent both the ecm and tcm tune to blacky last night so hopefully he might have a fix for me.

Obviously you can see i have 2.90 ratio in for the tcm but that's because it didnt make any difference to the true speed during logging. i just left on the stock setting.
February 26th, 2009
Tre-Cool

it has 20" rims on it.

yeah it's a ve. Used to be delco's ride. which is why i havent posted the tunes.
February 26th, 2009
gmh308

Quote:

Originally Posted by Tre-Cool

it has 20" rims on it.

yeah it's a ve. Used to be delco's ride. which is why i havent posted the tunes.

Heh heh :grin:.

275/35/20's or thereabouts?
February 26th, 2009
Tre-Cool

Quote:

Originally Posted by gmh308

Heh heh :grin:.

275/35/20's or thereabouts?

Somem like that.

http://www.vyssute.com/downloads/My%...%20(Large).jpg

http://www.vyssute.com/downloads/My%...%20(Large).jpg
Can't go wrong with a set of fatties on the back.
February 26th, 2009
gmh308

Quote:

Originally Posted by Tre-Cool

Somem like that.

Can't go wrong with a set of fatties on the back.

VERY nice. :grin: Car and wheels! These are just great looking cars! :hihi:

Is there a rear wheel kw number those fatties need to deal with?

At 275/35/20, PPK calculate out to about 61k.

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