RS5 Dyno Results - Maha LPS 3000 Dyno

[JamesRS5]

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[Hippyshakes]

Ok everything but your ginormous can of worms that needs to be sized down I am interested in. Teh can of worms are funny but too big ;)

Watching with interest!!!

[doug97gxe]

i'm confused it says 255 wheel

[d1amund]

I repeat (from the ECS thread): Are you sure that reading isn't in kW? I know the display says hp but if you take the well known wheel hp of about 350 and convert it to kW...it's 260.

Are you really willing to accept there is a 200hp (around 45%) drivetrain loss?

[AudiYes]

If this means anything.

We've raced my RS4 with Jhm exhaust, downpipes and 93 tune vs my RS5 from 2nd gear and 3rd gear pulls.

It's very very close but RS4 seems to get a jump and sometimes pull a tiny bit away.

[AirmattRS5]

Yea, what's going on with the wheel "hp"? Unless this only takes into account one driveshaft.

[Jimmy ny]

This is not accurate. People in the USA, look at APR's Dyno for their ECU tune and look at ECS Tuning Dyno for their intake and supporting mods. I don't know what kind of dyno this is, but this is not accurate. No car loses 200HP from the crank to the wheels.

[d1amund]

No car loses 200HP from the crank to the wheels.

Agreed. If this was the case we would have plunked down a fair amount cash for the worlds most inefficient car.

[JamesRS5]

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[JoshDub]

So you're telling me that the RS5 loses more HP to drivetrain loss than the base model TDI A5 even has?

[A4-B6]

So you're telling me that the RS5 loses more HP to drivetrain loss than the base model TDI A5 even has?

Nope, they're rejecting his reality and substituting it with one of their own.

[JamesRS5]

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[doug97gxe]

I'm confused again because APR got 282 wheels stock .. and thats about what a Stock S5 dyno's on the low end .. more so 300-310 on the high end.. there is no confusion that a Stock RS5 is much faster than a stock S5 .. at 450 hp stock .. the car should dyno 370 ish to the wheel

[JamesRS5]

I'm confused again because APR got 282 wheels stock .. and thats about what a Stock S5 dyno's on the low end .. more so 300-310 on the high end.. there is no confusion that a Stock RS5 is much faster than a stock S5 .. at 450 hp stock .. the car should dyno 370 ish to the wheel

That would make sense if APR removed the wheels and measured at the hubs.

[JamesRS5]

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[dazed1]

I can't believe no one else has put an RS on the dyno? Surely someone has been a little curious if Audi was telling the truth?

I've had mine on a DynoJet (I believe). Completely stock. I don't have the print out anymore, but I believe to the wheels it was somewhere between 340-360hp.

[dazed1]

Here's a video from my run (June 2014). I zoomed in on the phone and it said 351hp.

[adbender]

Drivetrain loss and WHP numbers do seem out of the norm/expected.

Most interested in the gains with the Eventuri...

Thanks for sharing JamesRS5!

[JamesRS5]

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[jamin_00]

I'm starting to understand the difference between runs and the numbers people are quoting now.

When ever my car has been run on the dyno it never changes gear during the power run.

I just spoke to MRC and they said they expect to see 390-425 on a stock RS5 but would not expect to see the AWHP that low but its not as high as others are saying and also run it in 5th gear

[JamesRS5]

I'm puzzled by the gear changes on Dazed's run. Well I'm at 425 so the figures are spot on for a healthy RS5, just these drag numbers to figure out.
Out of interest Jamin, what dyno does MRC use?

[doug97gxe]

Here's a video from my run (June 2014). I zoomed in on the phone and it said 351hp.

this makes more sense.. this is closer to Audi's numbers

[doug97gxe]

I'm puzzled by the gear changes on Dazed's run. Well I'm at 425 so the figures are spot on for a healthy RS5, just these drag numbers to figure out.
Out of interest Jamin, what dyno does MRC use?

your crank numbers weren't bad.. its your wheel number that were off by a crazy amount

[jamin_00]

I'm puzzled by the gear changes on Dazed's run. Well I'm at 425 so the figures are spot on for a healthy RS5, just these drag numbers to figure out.
Out of interest Jamin, what dyno does MRC use?

Quote "cartec dyno - one that measures at the wheels and rundown losses then can give you flywheel numbers from those 2 measurements."

From what I see a lot of guys in the States don't have their cars on dyno's when they are mapped either!! Bizarre

[JamesRS5]

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[JamesRS5]

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[F16HTON]

This OP is absolutely 100% spot on with his information regarding the MAHA dyno. The MAHA is the most accurate dyno in existence. The numbers that it puts out are almost always spot on with what the manufacturer quotes for power.

If you follow the green line, you see that the parasitic loss is not constant, as the heat, friction and RPM increases, the loss increases too, it starts out at zero loss when the drivetrain is not moving and increases with RPM, but is reverse proportional with the amount of torque that is made.

The end result is that the OP's car made 425BHP, as opposed to the 450BHP that is marketed by Audi. There are many things that can affect the power output such as fuel, carbon buildup, ambient temperatures, etc.

Do not shoot the messenger, he has spent his own money to get a solid baseline test of his RS5 and he states that he will be back with numbers for the Eventuri Intake. This is a great test, it would be awesome too if he were able to get one more RS5 to test, as a positive control.

[LINDW4LL]

This OP is absolutely 100% spot on with his information regarding the MAHA dyno. The MAHA is the most accurate dyno in existence. The numbers that it puts out are almost always spot on with what the manufacturer quotes for power.

Something to keep in mind is that crank numbers from the manufacturer many times should not be taken too seriously.

Look at the B8 S4. It consistently makes 295-300whp yet Audi only claims "333bhp". Does that mean it only has 10% drivetrain loss? No. The new M3/M4 consistently puts down 400-420whp yet BMW claims only 425hp at the crank... The C7 S6 makes 390-400whp stock, yet Audi claims 420 at the crank. Same with the new C63, too. The list goes on...

[F16HTON]

I know this is apples to oranges, but here is another MAHA dyno of a nearly stock car. B7 RS4, 4.2L, high revving, Audi claimed 420HP.

[LINDW4LL]

I know this is apples to oranges, but here is another MAHA dyno of a nearly stock car. B7 RS4, 4.2L, high revving, Audi claimed 420HP.

Thanks for posting! The difference is that the wheel figures you just showed are actually accurate. 320whp is right on par with what a healthy RS4 makes on nearly every dyno.

255whp is ridiculously far off for an RS 5.

[AirmattRS5]

The end result is that the OP's car made 425BHP, as opposed to the 450BHP that is marketed by Audi. There are many things that can affect the power output such as fuel, carbon buildup, ambient temperatures, etc.

You mean WHP? I thought BHP is how the mfgr measured it with engine seperated with the dyno connected to the flywheel...?

In any regards, i understand the graph a little better now and see where there 425 is coming from. really not a bad number considering all the variables at hand.

[JamesRS5]

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[F16HTON]

Thanks for posting! The difference is that the wheel figures you just showed are actually accurate. 320whp is right on par with what a healthy RS4 makes on nearly every dyno.

255whp is ridiculously far off for an RS 5.

The WHP means nothing in as far as the MAHA is concerned, what does matter is the end result which is pretty accurate as far as all other RS5 that have been measured.

If you look at the drag power between the RS4 and the RS5 on the MAHA, they are consistent. Although the RS4 only shows 103 HP as the drag loss, this is at 7200 RPM as opposed to OP's 166 HP at 8100 RPM's. If you were to measure the OP at 7200, it looks very close to the 103 HP number.

One thing with the MAHA is that you can have the same BHP numbers on two different cars and get two different WHP numbers, because of the drag loss that is measured.

The drag loss has many variable associated with it, as it takes into account heat, friction, and the transfer of power from the engine to the wheels.

[doug97gxe]

You mean WHP? I thought BHP is how the mfgr measured it with engine seperated with the dyno connected to the flywheel...?

In any regards, i understand the graph a little better now and see where there 425 is coming from. really not a bad number considering all the variables at hand.

BHP is brake horsepower aka crank horsepower .. usually the numbers manufacturers quote

[JoshDub]

In actuality it doesn't matter what the numbers are. Lets just see the percentage gain from the intake.

[Mops@Nemesis]

Very interested to see what the Eventuri does to the numbers.

Good work James, and thanks.

[LINDW4LL]

Yes, me too. Excited to see. The delta is all that matters.

The Eventuri intake for the M3 has had several independent dynos done as of late and all have shown gains near what Eventuri is claiming. I really believe in the company.

[JamesRS5]

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[jamin_00]

That looks stunning!!

I thought normal dyno's can only measure power at the wheels and the rest is a calculation? I still don't get all the in's and out's of it and this is just confusing me more.

[joshuamoore]

Is it possible to get the Air:Fuel ratios for before and after? That way we can see what the real results are instead of just the engine running lean?