Odd A4 dyno graph - any guesses as to the problem?
#1
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Odd A4 dyno graph - any guesses as to the problem?
Had my car dynoed at a dyno day over the weekend and ended up with a really strange graph.
The shop seemed to think the transmission was slipping. However, I had it dynoed and tuned by a different shop last week on a hub-type dyno and got a normal looking graph. I also haven't noticed any signs of slipping. The fluid still looks and smells new (changed a few months ago) and I haven't noticed any RPM freakouts.
Mods include a Vigilante 3200, TR224, JBA shorties, cat back, underdrive pulley.
Anyone make anything of this dyno graph? Was the pull done incorrectly? I don't know what gear he did it in and wasn't paying close enough attention to notice any abnormalities.
Weird graph (dynoed unlocked on a DynoJet):
Normal graph (dynoed locked a week prior on a Dynapack):
The shop seemed to think the transmission was slipping. However, I had it dynoed and tuned by a different shop last week on a hub-type dyno and got a normal looking graph. I also haven't noticed any signs of slipping. The fluid still looks and smells new (changed a few months ago) and I haven't noticed any RPM freakouts.
Mods include a Vigilante 3200, TR224, JBA shorties, cat back, underdrive pulley.
Anyone make anything of this dyno graph? Was the pull done incorrectly? I don't know what gear he did it in and wasn't paying close enough attention to notice any abnormalities.
Weird graph (dynoed unlocked on a DynoJet):
Normal graph (dynoed locked a week prior on a Dynapack):
#4
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I suppose it could have been tires slipping on the rollers, but my car isn't exactly a powerhouse and they did pulls with cars in the 500+ hp range that day. They primarily dynoed M6s, and did three A4s. Mine was the only one with a stall so it's looking like the dyno graph view might be the issue.