Dyno

[01_A4_Black]

So I dyno'd Saturday at Revolutions Performance down in the springs. I won the runs at the DATR raffle. I ended up putting down 245awhp and 200awtq. For reference, a stock wrx ran 160awhp and a stock sti ran 210awhp. Still much room for improvement, but $$ is going other places at the moment.

I'll post the graph as soon as I scan it.

Comments welcome...

[Don Supreme]

how much boost?

[01_A4_Black]

20psi

[mike-2ptzero]

Pretty good numbers for a dyno dynamic. Were those SAE corrected numbers?

[bob12312357]

Nice, outta curiosity what were K04 B5's puttin out if you recall.

[pipe7284]

isnt a gt2871r able to go close to 300whp?

[Don Supreme]

isnt a gt2871r able to go close to 300whp?

And more...........

Dyno dynamics is a very low reading dyno. I personally wouldn't dyno on one. I saw a 2871 a4 put down UNDER 200 awhp and a stage 3 s4 put down 300 AWHP on a DD dyno......

[01_A4_Black]

Pretty good numbers for a dyno dynamic. Were those SAE corrected numbers?

Those are uncorrected numbers.

[01_A4_Black]

Nice, outta curiosity what were K04 B5's puttin out if you recall.

They don't do a lot of Audi's there, mostly Suburu's and Evo's. So they didn't have a lot to compare to.

[mike-2ptzero]

isnt a gt2871r able to go close to 300whp?

But look at the type of dyno and where he is located. Plus have to account for what octane fuel and how much boost being ran.

[01_A4_Black]

But look at the type of dyno and where he is located. Plus have to account for what octane fuel and how much boost being ran.

At altitude and was running 91 octane. I want to take another run once I get my 100oct tune to see the difference. I would also like to run on a dynojet to compare to others. I am only running 20psi to be conservative on my stock block.

[mike-2ptzero]

At altitude and was running 91 octane. I want to take another run once I get my 100oct tune to see the difference. I would also like to run on a dynojet to compare to others. I am only running 20psi to be conservative on my stock block.

If you are at high elevation running more boost might not get you any gains since the turbo is most likely well out of its effiency map at 20psi.

[pipe7284]

But look at the type of dyno and where he is located. Plus have to account for what octane fuel and how much boost being ran.

And more...........

Dyno dynamics is a very low reading dyno. I personally wouldn't dyno on one. I saw a 2871 a4 put down UNDER 200 awhp and a stage 3 s4 put down 300 AWHP on a DD dyno......

True that!!!!!

whats the best and most accurate dyno?

[NyteEscape]

whats the best and most accurate dyno?

my butt.......

[California Jay]

the Dyno Dynamics is about as close/accurate as you will get to aiding in real life situations... the beauty of it is the preload you can adjust while driving. Extreme loads can let you see how well the car will perform in a track or towing enviroment, or up hill etc etc. Great for R/D.

[mike-2ptzero]

Eddy load, Dyno dynamic is not the only dyno to use that feature.

[onemoremile]

If a stock 300 hp STI did 210 then 245whp is 350bhp which isn't bad.

[djwimbo]

If a stock 300 hp STI did 210 then 245whp is 350bhp which isn't bad.

eh, figuring the std 22% loss that's 300-315HP @ the crank.
For the elevation and and octane that's still going to be a really fun car to drive.

[01_A4_Black]

Yea, it's great for a DD. Maybe someday I'll build the engine.

[blmlozz]

isnt a gt2871r able to go close to 300whp?

a good running 2860rs will put down just above 300awhp.

the Dyno Dynamics is about as close/accurate as you will get to aiding in real life situations... the beauty of it is the preload you can adjust while driving. Extreme loads can let you see how well the car will perform in a track or towing enviroment, or up hill etc etc. Great for R/D.

I agree, knowing some people that prefer it vs other kinds. However since most of the enthusiast crowd use mustang/Dynojet on their cars, it's not ideal.

[djwimbo]

a good running 2860rs will put down just above 300awhp.

On W/M and not at his altitude.

[01_A4_Black]

a good running 2860rs will put down just above 300awhp.


I agree, knowing some people that prefer it vs other kinds. However since most of the enthusiast crowd use mustang/Dynojet on their cars, it's not ideal.

I want to run on a dynojet just to see what the difference is. Then I can compare to the majority.

[onemoremile]

eh, figuring the std 22% loss that's 300-315HP @ the crank.
For the elevation and and octane that's still going to be a really fun car to drive.

Um, no. A stock STI is 300hp or damn close to it. If it made 210whp then the losses on this dyno are 30%. 300 divided by 210 and then multiplied by 245 is 350.

The "standard" drivetrain loss is just an estimate. In this case the STI functions as a control group and gives us the percentage needed for a closer approximation.

If the stock STI made 250whp then it lost 1/6 of it's power. If it had made 200whp then it lost 1/3 of it's power. It doesn't actually lose that power but consumes it moving all those moving parts around. The dyno is calibrated to read whatever it reads and at best approximates a consistent loss.

It is like using a torque wrench that you know clicks at 10% too low. Jack up the values 10-11% and you get the desired torque.

[djwimbo]

Um, no. A stock STI is 300hp or damn close to it. If it made 210whp then the losses on this dyno are 30%. 300 divided by 210 and then multiplied by 245 is 350.

The "standard" drivetrain loss is just an estimate. In this case the STI functions as a control group and gives us the percentage needed for a closer approximation.

If the stock STI made 250whp then it lost 1/6 of it's power. If it had made 200whp then it lost 1/3 of it's power. It doesn't actually lose that power but consumes it moving all those moving parts around. The dyno is calibrated to read whatever it reads and at best approximates a consistent loss.

It is like using a torque wrench that you know clicks at 10% too low. Jack up the values 10-11% and you get the desired torque.

I get what you're saying, but that assumes the drivetrain loss from an STI and from an A4 are identical. Given they still use the same style ring and pinion, longitudinally mounted engine, etc. I could see the losses being close, but not identical.

How is that style dyno set up? A set of rollers calculated at XXX lbs, or is the the type that bolts right onto the wheel hubs?

[biketsai]

Hmm, how much do you think I will dyno?
01 A4 Quattro Automatic
T28-2.5" turbo back, 2.5" testpipe.
380cc injectors, running 23lbs, 93 octane.

[01_A4_Black]

Here is my hp/tq chart. All 3 runs were identical within .5hp.

[mike-2ptzero]

When do you hit full boost because your dyno plot looks like a GT35 not a GT2871r. Why did they only run the car to 6600?


I understand you are at high elevation but 6500 rpm's seems a bit late to be hitting full boost.

[01_A4_Black]

I hit full boost just under 4k rpm. Not sure why he didn't run up to 7k, but that's where he ended. I am going to try and run some logs this weekend, so I'll try and post boost curves.

[mike-2ptzero]

I hit full boost just under 4k rpm. Not sure why he didn't run up to 7k, but that's where he ended. I am going to try and run some logs this weekend, so I'll try and post boost curves.

Odd because thats not what the dyno is saying.


Here is my dyno to compare it with, I hit 25psi at 4600 rpm and ramps up to 32psi before 5400 rpm.




Back when I was just running 25psi.
Note: The tq graph is not scaled correctly, the numbers on the left side is for whp only.

[Don Supreme]

Had you run it up to 7.2k you would have probably put down 260 + awhp.. Seeing as though your torque curve kept going up...

That dyno looks really wierd for a 2871. As Mike said it looks like a 30 series dyno, and I also find it wierd that you PEAK torque is > 6400..... It looks like a big cam dyno without the revs haha.

[dougyfresh]

If a stock 300 hp STI did 210 then 245whp is 350bhp which isn't bad.

My thoughts exactly.

a good running 2860rs will put down just above 300awhp.

On race gas 300awhp.

The OP ran on 91octane. Pretty good numbers for 91octane at altitude in my opinion. Esp when compared to the Subaru's that dynod on the same day. Colorado Springs is around 6,000ft above sea level.

[01_A4_Black]

Not sure then. That was my first dyno experience so I wasn't sure what to expect from it. Hopefully I can get on a mustang/dynojet before winter to compare with. Anything I can log this weekend besides boost to explain the chart?

[dougyfresh]

I think there is a dynojet somewhere in the Denver area. Talk to Jordan (co avant) and Ted (denvernoob). They know where it is and are planning on going there very soon.

[CO AVANT]

http://www.macautosport.com/

[mike-2ptzero]

My thoughts exactly.



On race gas 300awhp.

The OP ran on 91octane. Pretty good numbers for 91octane at altitude in my opinion. Esp when compared to the Subaru's that dynod on the same day. Colorado Springs is around 6,000ft above sea level.

Well I asked if it was corrected readings and he said no but looking at the Subaru's numbers it looks like they are corrected and here is why.

Subaru makes 300chp at sea level, put down 210 whp and a dynodynamic dyno reads at 30% loss.

210 whp with a 30% loss = 300chp
The math (210x100) divided by 70 = 300

So this means the readings for the A4 are also corrected for sea level.

The stage 3 S4 put down 290whp and on that dyno thats 414chp.


Sorry to rain on the parade again, but dyno shops are always going to give a SAE corrected reading unless the person ask for uncorrected print out.

[dougyfresh]

Mike... post #8

Those are uncorrected numbers.

[mike-2ptzero]

Mike... post #8

Yes I know, but that is because the dyno plot does not say if it is corrected or not. So explain how a 300chp STI makes 300chp at 6000 ft.

[sean1.8t]

i hate dyno threads.

everyone's an expert.

great numbers man! really!

[01_A4_Black]

Here is a Zeitronix log from a few months ago. The boost reading is 2-3psi lower than actual. Shop wasn't sure why, but was consistant on all cars.



I can send the logs too if anyone is interested.

[CO AVANT]

That # for the sti subi has got to be corrected if done on a dynamics machine up here. I did a dyno on a dynamics machine up here with my K04 and barely put down 200whp. Come on Mike, we all know how you LOVE SAE corrected #'s on FI setups