What is up with my A/F? Why am I not putting more power to the ground?
02-27-2005, 04:52 AM
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What is up with my A/F? Why am I not putting more power to the ground? Had my car dyno'ed today ('04 C5 with zip-tie and Corsa cat-back), and out of three runs the best power it could muster was 297rwhp and 326 rwtq. Something doesn't seem right, I thought I should be putting more power to the ground? This was run on a dynojet at a local performance shop. The only things I can think of is my a/f is really rich up high in the rpm band, or I was slipping on the dyno (was a rainy day, so tires were wet and they are BALD BALD BALD stock runflats, almost no tread left.) Can anyone help me out? Here's a picture of the graph, sorry for quality, the printer was acting up at the shop.
02-27-2005, 03:48 PM
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Im sure you..yourself can look at that dyno sheet and see that wasnt a very accurate dyno.. Its nothing but chicken scratch. Try again when its not so wet. If problem persists.. then your car is missing out for some reason or another..
02-28-2005, 09:45 AM
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there's nothing wrong with your numbers. you have a stock C5 and you are putting down stock C5 numbers. I can't tell how rich you are running (i can't read a damn thing on that graph), but you might be able to gain 5-10 with a tune to get it a little leaner up top
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02-28-2005, 03:26 PM
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Those #'s are inline with a basically stock C5. Until you start doing headers and fullintake/exhaust you'll be blow 300-310rwhp. Torque seems a little high, are you an A4? Air/fuel looks jacked, either plugs semi fouled not giving good fire at full throttle or sensor was coming out of the tailpipe (imo).
02-28-2005, 08:10 PM
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Originally Posted by BlueSix
there's nothing wrong with your numbers. you have a stock C5 and you are putting down stock C5 numbers.
03-01-2005, 10:21 PM
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Originally Posted by leeluther252
no dyno should look like that.. its not even close to being smooth. Peek power may not be off by that much but the car has a problem
03-02-2005, 08:18 AM
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A lot of dyno operators do not smooth because you get higher numbers that way, even though they are false. Misfires usually show up in the A/F ratio with lean spikes lined up with power dips. I can't read the graph so I'll stop here.
03-03-2005, 09:52 AM
#13
Is it an A4? 04s usually out down right at 299rwhp or so, which is right where you are at. I wouldn't worry at all. Zip Tie mod does jack, and Corsa's don't flow noticeably more than stock, regardless of what you think. At 500rwhp, the Corsa's might flow a few cfm more for a max of 5-10HP, but at stock levels, you're not going to pick up anything with them.
And there is no smoothing on that graph.
And there is no smoothing on that graph.