Modshack adaptor $20, VDO boost gauge $30, tubing kit $14, seeing 24psi spike, priceless >
05-06-2005, 02:29 PM
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Modshack adaptor $20, VDO boost gauge $30, tubing kit $14, seeing 24psi spike, priceless >
<center><img src="http://pictureposter.audiworld.com/90421/audi.jpg"></center><p>So what's normal for a APR 93 chipped car with the ECS N75 valve?
05-06-2005, 02:43 PM
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Oh gee :) hey I talked to Jeff Moss, I need to re dyno the car in FWD and I bet >>>
it comes out MUCH smoother. He thinks Haldex and AWD dyno arent getting along, and its throwing the power back and forward, hence messing with the ECU.
05-06-2005, 02:50 PM
#6
Interesting, I might have more too then!
When I dyno'ed a month ago, I had 241 to the wheels, look in my sig, and that was on an awd dyno, maybe it is more than that?
Whatever it is, it is, no big deal, I dig my ride!
Whatever it is, it is, no big deal, I dig my ride!
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05-06-2005, 03:13 PM
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I can't complain about the gauge mount, but I see why you charge an extra $30 to install it. >
Yes, I can get my boost machine now that I have the boost gauge. But wait, I'd want a TTDA first, but to do that right I'd need the FMIC, whoops now I've just spent $1500. At this point I'm just happy I've got brakes that work again.
05-06-2005, 03:37 PM
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If you run in FWD only you will show higher WHP numbers since there will be
<center><img src="http://www.vwvortex.com/jamie/R32dyno/VWV_R32_dyno1.gif"></center><p>not as much drivetrain "drag" on the system. Unless you dyno stock FWD and then modded FWD - the numbers cannot be compared.
Dynapak hub dyno's appear to be the only ones that aren't really affected by haldex - and interestingly enough show how power is transferred. Since there is no "slip" all the other parameters the engage the Haldex are in full force.
Vortex ran their Project R32 on a Dynapak and put down 208hp to the wheels. R32's are 250hp from the factory (although advertised at 240hp - but they are in fact 250hp in the US)so that shows a 17% drivetrain loss.
Here's a excerpt from Jamie on the dyno:
We went through a lot of the data plots and one of them was a torque graph showing the difference between the front two and rear two pods (so front vs. rear output at the hubs). At low RPM at the start of the run the Haldex system went to an immediate 50/50 split of power between front and rear wheels. However, as the run progressed in both RPM's and MPH (speed) the Haldex system progressively and very evenly started to divert power back to the front wheels ending with about 90% of the power to the front wheels at redline.
So is the Haldex system programmed to push power back to the front wheels at high speeds (90 mph) and high shaft rotation? It could do this to prevent an overheat condition in the clutchpack, but that's speculation on my part. I have emails into contacts at VWAG and at Haldex to try and find out what the story is. Meanwhile I've been contemplating what this means on the dyno run. The Haldex coupling was still putting about 10% power to the rear wheels at the end of the run, so there is still driveline loss through the main shaft, clutch pack and rear drivetrain components and I'm not inclined yet to say that driveline losses would be closer to FWD - in reality *if* there were any changes it would probably meet in the middle somewhere unless the Haldex system is extremely efficient.
I'd like to go back to the dyno and do some more testing. One that I'd like to do is to run the car through a typical fourth gear dyno pull and when the haldex starts to divert power to the front, back off on the throttle (and thus speed and RPM's) to see if there is a progressive return of power to the rear as speed decreases *or* if it is related to perceived slip or continuous perceived slip conditions in some way and instantly goes back to 50/50 split.
Either way I wouldn't read much of anything into the above yet till we do some more testing and get answers from some people on how the Haldex system behaves.<ul><li><a href="http://forums.vwvortex.com/zerothread?id=1293861">R32 Dynapak dyno</a></li></ul>
Dynapak hub dyno's appear to be the only ones that aren't really affected by haldex - and interestingly enough show how power is transferred. Since there is no "slip" all the other parameters the engage the Haldex are in full force.
Vortex ran their Project R32 on a Dynapak and put down 208hp to the wheels. R32's are 250hp from the factory (although advertised at 240hp - but they are in fact 250hp in the US)so that shows a 17% drivetrain loss.
Here's a excerpt from Jamie on the dyno:
We went through a lot of the data plots and one of them was a torque graph showing the difference between the front two and rear two pods (so front vs. rear output at the hubs). At low RPM at the start of the run the Haldex system went to an immediate 50/50 split of power between front and rear wheels. However, as the run progressed in both RPM's and MPH (speed) the Haldex system progressively and very evenly started to divert power back to the front wheels ending with about 90% of the power to the front wheels at redline.
So is the Haldex system programmed to push power back to the front wheels at high speeds (90 mph) and high shaft rotation? It could do this to prevent an overheat condition in the clutchpack, but that's speculation on my part. I have emails into contacts at VWAG and at Haldex to try and find out what the story is. Meanwhile I've been contemplating what this means on the dyno run. The Haldex coupling was still putting about 10% power to the rear wheels at the end of the run, so there is still driveline loss through the main shaft, clutch pack and rear drivetrain components and I'm not inclined yet to say that driveline losses would be closer to FWD - in reality *if* there were any changes it would probably meet in the middle somewhere unless the Haldex system is extremely efficient.
I'd like to go back to the dyno and do some more testing. One that I'd like to do is to run the car through a typical fourth gear dyno pull and when the haldex starts to divert power to the front, back off on the throttle (and thus speed and RPM's) to see if there is a progressive return of power to the rear as speed decreases *or* if it is related to perceived slip or continuous perceived slip conditions in some way and instantly goes back to 50/50 split.
Either way I wouldn't read much of anything into the above yet till we do some more testing and get answers from some people on how the Haldex system behaves.<ul><li><a href="http://forums.vwvortex.com/zerothread?id=1293861">R32 Dynapak dyno</a></li></ul>
