I dynoed today on an all wheel drive mustang dyno. With my APR 93 program, TIP and K&N filter I made a best of 206 hp. I only have a printout I will need to scan, but best I can describe it there are 3 15hp dips evenly spaced out on the curve. I am running a new oem diverter valve, my guess is its that or the N75. Any ideas?
brian_216
Re: Dynoed today, funny dips in curve? (Corrado SLC NL)
it may the AWD system cutting on and off. even though the wheels are spinning all th time, the system is not constantly engaged. When i dyno'd my car, I can plot the torque and HP of the front and rears seperately. The rear wheels get power periodically and when they haldex clutch grabs, it will cause the car to hesitate a bit and make the power drop....I think I have my plot...
here you see the overall power with a lot of spikes.
![Image]()
those dips correspond to the power coming on and off of the rear wheels. this is only a plot of rear wheel torque...
![Image]()
sound plausable for you?
it may the AWD system cutting on and off. even though the wheels are spinning all th time, the system is not constantly engaged. When i dyno'd my car, I can plot the torque and HP of the front and rears seperately. The rear wheels get power periodically and when they haldex clutch grabs, it will cause the car to hesitate a bit and make the power drop....I think I have my plot...
here you see the overall power with a lot of spikes.
those dips correspond to the power coming on and off of the rear wheels. this is only a plot of rear wheel torque...
sound plausable for you?
Re: (formulanerd)
I know a kid at work that would try to tell you he had an all wheel drive mustang, and by the end of the conversation he would start to believe himself.
I thought that the AWD may have been the issue, but the ESP was turned off so would it really make a difference?
in the video you can hear it back off then come back.
http://www.youtube.com/watch?v=AAV5uMPkhFc
Modified by brian_216 at 8:00 PM 1-28-2007
I know a kid at work that would try to tell you he had an all wheel drive mustang, and by the end of the conversation he would start to believe himself.
I thought that the AWD may have been the issue, but the ESP was turned off so would it really make a difference?
in the video you can hear it back off then come back.
http://www.youtube.com/watch?v=AAV5uMPkhFc
Modified by brian_216 at 8:00 PM 1-28-2007
Re: (formulanerd)
You do know that Mustang is the name of the Company that makes the dyno and it has nothing to do with a Ford Mustang right ?
http://www.mustangdyne.com/
| Quote, originally posted by formulanerd » |
| a little off topic, but did anyone ever wonder why there was an AWD mustang dyno created? |
You do know that Mustang is the name of the Company that makes the dyno and it has nothing to do with a Ford Mustang right ?
http://www.mustangdyne.com/
Re: (brian_216)
ESP can't be on while dynoing, and those rear wheels still come on and off. My esp was off too during those plots too. Remember, quattro isn't just about slipping, the haldex comes on also depending on TQ from the engine. Otherwise, if you think it's boost or your DV...u need a boost gauge.
ESP can't be on while dynoing, and those rear wheels still come on and off. My esp was off too during those plots too. Remember, quattro isn't just about slipping, the haldex comes on also depending on TQ from the engine. Otherwise, if you think it's boost or your DV...u need a boost gauge.
Re: (Krissrock)
There's alot of conflicting information about dyno'n it on a FWD dyno with the haldex disconnected. I'm talking about AWD dyno with the haldex disconnected. The wheels can still turn but are providing any power. Dynapac and Dynojet AWD dyno's work better this way.
| Quote, originally posted by Krissrock » |
| word is it's not good to disconnect the haldex...i thought Schwing, Bipes, or WaK had a letter straight from AUDI on that topic? Even though it's electronically disabled, the physical members are still moving... |
There's alot of conflicting information about dyno'n it on a FWD dyno with the haldex disconnected. I'm talking about AWD dyno with the haldex disconnected. The wheels can still turn but are providing any power. Dynapac and Dynojet AWD dyno's work better this way.
Re: (joe@vwvortex)
http://putstuff.putfile.com/42743/2793812/3
here is the sheet. I did not disconect the haldex, I did run all wheel drive just to clear everything up.
http://putstuff.putfile.com/42743/2793812/3
here is the sheet. I did not disconect the haldex, I did run all wheel drive just to clear everything up.
Re: (brian_216)
Interesting. Mine didn't do that at all and I've dyno'd it several times now on the same dyno. Latest results to be coming in a future installment of the project. Here's my most recent dyno. The large dip is due to a cylinder misfire - which turned out to be the plug. Latest dyno didn't show the dip. I would run a vag on your car and see if you threw any misfire codes. Although the dips on your dyno are very evenly spaced.
![Image]()
Interesting. Mine didn't do that at all and I've dyno'd it several times now on the same dyno. Latest results to be coming in a future installment of the project. Here's my most recent dyno. The large dip is due to a cylinder misfire - which turned out to be the plug. Latest dyno didn't show the dip. I would run a vag on your car and see if you threw any misfire codes. Although the dips on your dyno are very evenly spaced.
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