[aka Reckless]

Originally Posted by 13vertss/r's

I know there sae corrected, but the 1le looks like the temps were in the 50's while yours was in the 80's. could that do it?

Runs are SAE corrected for those parameters. Both cars are basically new, so the air filter isn't it. The auto pull was in 6th gear for 1:1 ratio.

This is likely the difference between a DoD car versus a non-DoD car. The DoD car gives up on the top end and the non-DoD car keeps pulling.

[reeper]

Pretty big difference in Temps and huge delta between power and torque on the A8. Haven't really seen that on any A8 runs? Hard to say what the reason is.

[L99BEN]

Originally Posted by 2SS_in_GA

Runs are SAE corrected for those parameters. Both cars are basically new, so the air filter isn't it. The auto pull was in 6th gear for 1:1 ratio.

This is likely the difference between a DoD car versus a non-DoD car. The DoD car gives up on the top end and the non-DoD car keeps pulling.

What's a DoD car?

[Grandpawmoses]

Something's wrong with the SS above 4500 rpm.
Just a guess but it's starving for fuel.

[detltu]

Interesting. I'm surprised they are that close actually. Would have thought the auto would lose a little more through the torque converter.

Very interesting.

[Megahurtz]

It's all in the gearing/drivetrain. The 1LE does not make anymore power at the motor. A real comparison would be to run them at the track.

[Zeke.Malvo]

Originally Posted by 13vertss/r's

I know there sae corrected, but the 1le looks like the temps were in the 50's while yours was in the 80's. could that do it?

Doubtful since SAE corrects for that. Only way weather can significantly affect it would be if timing were pulled. But usually there is a pronounced dip when timing is pulled.

[aka Reckless]

Originally Posted by L99BEN

What's a DoD car?

DoD is Displacement on Demand....I think they call it Active Fuel Management (AFM) now? Anyhow, don't all the 6th gen's have this. Not sure if the 1LE cars are without it???

I am guessing that's why the SS with auto has a graph that becomes more wavy at the top end? Not sure why else there would be a diff.

Both cars have NPP exhaust also

Only other thing I can think of is timing being pulled due to false knock or something???

[SuperSound]

Originally Posted by 2SS_in_GA

Runs are SAE corrected for those parameters. Both cars are basically new, so the air filter isn't it. The auto pull was in 6th gear for 1:1 ratio.

This is likely the difference between a DoD car versus a non-DoD car. The DoD car gives up on the top end and the non-DoD car keeps pulling.

Don't think AFM has anything to do with it. The A8 should lose more power and it did. Down 20RWHP works out to be about 4% extra driveline loss. The M6 lost 8% and the A8 12%. Sounds exactly like what driveline losses run on cars nowadays.

But, the choppiness of the line looks like my '99 dyno when the fuel trims were off. Maybe some of the experts will chime in if that's normal for auto cars. But those temps could have been affecting A/F.

[aka Reckless]

Originally Posted by SuperSound

Don't think AFM has anything to do with it. The A8 should lose more power and it did. Down 20RWHP works out to be about 4% extra driveline loss. The M6 lost 8% and the A8 12%. Sounds exactly like what driveline losses run on cars nowadays.

But, the choppiness of the line looks like my '99 dyno when the fuel trims were off. Maybe some of the experts will chime in if that's normal for auto cars. But those temps could have been affecting A/F.

So then driveline loss is greater above 4800 rpm for the auto?

[L99BEN]

Originally Posted by 2SS_in_GA

So then driveline loss is greater above 4800 rpm for the auto?

The driveline loss should be accross the board not just in the upper rpms.
Maybe like you said, timing pull for some reason.

[SuperSound]

Originally Posted by 2SS_in_GA

So then driveline loss is greater above 4800 rpm for the auto?

Remember, this is a chassis dyno which is being corrected to give a "SAE" number. It's not exact measurements. The gearing differences and effect of torque multiplication (evident by the auto actually have 1 more RWTQ than the M6 despite driveline loss) can skew the lines so they look even, but in reality they aren't. SAE corrects for atmosphere I know but think it's the dyno operator who has to correct for gearing.


But even if my above thinking is all wrong, you have the simple fact that an A8 is not going to dyno higher than an M6 assuming the cars are stock. Your losses in HP match what is expected. Maybe the lines diverge at 4800rpm because the losses become more substantial at those RPMs for the converter. IDK, I am by no means an expert.

Also I know there was a bit of controversy over whether M6 cars did have AFM hardware or not. Did anyone ever finally confirm that?

[Zeke.Malvo]

Originally Posted by SuperSound

Remember, this is a chassis dyno which is being corrected to give a "SAE" number. It's not exact measurements. The gearing differences and effect of torque multiplication (evident by the auto actually have 1 more RWTQ than the M6 despite driveline loss) can skew the lines so they look even, but in reality they aren't. SAE corrects for atmosphere I know but think it's the dyno operator who has to correct for gearing.


But even if my above thinking is all wrong, you have the simple fact that an A8 is not going to dyno higher than an M6 assuming the cars are stock. Your losses in HP match what is expected. Maybe the lines diverge at 4800rpm because the losses become more substantial at those RPMs for the converter. IDK, I am by no means an expert.

Also I know there was a bit of controversy over whether M6 cars did have AFM hardware or not. Did anyone ever finally confirm that?

Load based dyno (Mustang Dyno) have inputs for gearing and weight. DynoJets do not.

[SuperSound]

Originally Posted by Zeke.Malvo

Load based dyno (Mustang Dyno) have inputs for gearing and weight. DynoJets do not.

Which one is this? Looks like a Dynojet but don't see it on the printout.