can anyone tell me what could be wrong with my car by this dyno graph?
03-15-2003, 11:43 AM
#1
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can anyone tell me what could be wrong with my car by this dyno graph?
my car only pulled 163 hp at the wheels when i dynoed it. i am running an apr chip, 007P dv, and ecs n75 valve.
<img src="http://www.imagestation.com/picture/sraid55/p842822f82d50d02a12b275672720704c/fc8069d9.jpg">
if you look at the graph, there is a sharp drop off after 3,700. the guy doing the dyno brought this drop to my attention and told me that it is probably either my dv or the race valve. would the dv not working properly cause this loss? thanks in advance
<img src="http://www.imagestation.com/picture/sraid55/p842822f82d50d02a12b275672720704c/fc8069d9.jpg">
if you look at the graph, there is a sharp drop off after 3,700. the guy doing the dyno brought this drop to my attention and told me that it is probably either my dv or the race valve. would the dv not working properly cause this loss? thanks in advance
03-15-2003, 01:04 PM
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Graph looks backwards...here's a couple dyno runs with different chips.
Max power usually us seen at higher rpms. Remember, hp is a function of torque and rpm. The hp should be rising, not spike then fall.
Here's a couple you can compare your car to:
MTM
<img src="http://www.rig.org.uk/newsite/TT/clivedl.jpg">
APR
<img src="http://www.rig.org.uk/newsite/TT/danksyl.jpg">
AmD
<img src="http://www.rig.org.uk/newsite/TT/coupesportl.jpg">
Superchip
<img src="http://www.rig.org.uk/newsite/TT/stevefl.jpg">
These give a good idea of the performance of each conversion. All cars were near identical spec (225) running forge DV006's and Milltek exhausts with Milltek high flow cats. The only differences were that the MTM car had standard cats and the Superchips car ran the Forge Front mount intercooler.
MTM >> High boost overshoot as usual from MTM shows in the large torque peak. Rapid drop off though due to charge air temps as seen by the power curve. Big kick up the back on the road.
APR >> A very smooth power curve with good torque - mirrors exactly how it feels on the road.
AmD >> Not quite as smooth as the APR conversion but a steeper power curve which shows up with the feel on the road.
Superchips >> Good conversion with nice power and torque. The forge I/C shows its worth with the torque being maintained due to the low charge temps.
Here's a couple you can compare your car to:
MTM
<img src="http://www.rig.org.uk/newsite/TT/clivedl.jpg">
APR
<img src="http://www.rig.org.uk/newsite/TT/danksyl.jpg">
AmD
<img src="http://www.rig.org.uk/newsite/TT/coupesportl.jpg">
Superchip
<img src="http://www.rig.org.uk/newsite/TT/stevefl.jpg">
These give a good idea of the performance of each conversion. All cars were near identical spec (225) running forge DV006's and Milltek exhausts with Milltek high flow cats. The only differences were that the MTM car had standard cats and the Superchips car ran the Forge Front mount intercooler.
MTM >> High boost overshoot as usual from MTM shows in the large torque peak. Rapid drop off though due to charge air temps as seen by the power curve. Big kick up the back on the road.
APR >> A very smooth power curve with good torque - mirrors exactly how it feels on the road.
AmD >> Not quite as smooth as the APR conversion but a steeper power curve which shows up with the feel on the road.
Superchips >> Good conversion with nice power and torque. The forge I/C shows its worth with the torque being maintained due to the low charge temps.
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03-15-2003, 02:11 PM
#8
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Here's mine from just after you left....I was the silver one about 2 cars back...
<center><img src="http://pictureposter.audiworld.com/40482/run1.2.jpg"></center><p><img src="http://pictureposter.audiworld.com/40482/dsc00503.jpg">
Mine also read low, but, turned out my AC was on when he did the run. Since I'm stock, I should have been close to 150 HP.
I guess if you had known there was a problem, you could have hooked my VAGCOM up during the run to check for timing retard.
I watched your boost guage during the first run and it looked like it peaked around 18 psi then dropped to around 14 so it may not be a boost issue.
Mine also read low, but, turned out my AC was on when he did the run. Since I'm stock, I should have been close to 150 HP.
I guess if you had known there was a problem, you could have hooked my VAGCOM up during the run to check for timing retard.
I watched your boost guage during the first run and it looked like it peaked around 18 psi then dropped to around 14 so it may not be a boost issue.
03-15-2003, 04:11 PM
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i had no idea that was you....
you should have told me your forum handle. it was nice to meet you. sorry i didnt have time to chat longer, i had to run to an appointment and was in a huge rush