Accuracy of Dyno shop widebands....?
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From: Northwest Tri Cities Kennewick, WA, USA
Accuracy of Dyno shop widebands....?
I am interested in the accuracy of dyno shop widebands, whether they be motec, dynojet, or whichever is offered with the dyno, my question is: HOW MUCH LEANER WILL A WIDEBAND STUCK IN THE END OF A MUFFLER READ THAN A WIDEBAND MOUNTED IN YOUR DOWNPIPE?
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From: Bellingham, WA, USA
Re: Accuracy of Dyno shop widebands....? (Hondaddict)
Here is a graph of a DynoJet in-pipe sniffer VS a PLX in the DP.
This particular sniffer was having problems that day, as it was slow to drop in, and then pegged no matter what at the end of the runs. Normaly I would trust its readings. (w/o a cat)
You can also see the lagtime of the Dyno sniffer; about 300-400rpms.
This particular sniffer was having problems that day, as it was slow to drop in, and then pegged no matter what at the end of the runs. Normaly I would trust its readings. (w/o a cat)
You can also see the lagtime of the Dyno sniffer; about 300-400rpms.
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Joined: Apr 2001
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From: Northwest Tri Cities Kennewick, WA, USA
Re: Accuracy of Dyno shop widebands....? (leed)
how is it possible for it to be 300-400 rpm slower???? I knew the dyno wideband would be slower because of how much farther back in the exhaust it is but 300-400 rpms seems ridiculously slower!
Where is this test from? Seems odd to me why the wideband in the muffler would be reading richer than the wideband in the Downpipe....hmmmmm
Anyone care to elaborate?
Where is this test from? Seems odd to me why the wideband in the muffler would be reading richer than the wideband in the Downpipe....hmmmmm
Anyone care to elaborate?
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Re: Accuracy of Dyno shop widebands....? (Hondaddict)
"<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hondaddict »</TD></TR><TR><TD CLASS="quote">I am interested in the accuracy of dyno shop widebands, whether they be motec, dynojet, or whichever is offered with the dyno, my question is: HOW MUCH LEANER WILL A WIDEBAND STUCK IN THE END OF A MUFFLER READ THAN A WIDEBAND MOUNTED IN YOUR DOWNPIPE?
</TD></TR></TABLE>
Regarding how much leaner/richer:
Depends on if any cats are in the way, and the age of the sensor. When tuning, it is best to compare your numbers with the shops numbers before relying on the graph numbers. Ask your local shop to buy a second wideband (LM1, PLX, whatever) to verify that their numbers are on. Ask how old their sensor is, etc.
As for reading "later", 200-300rpm is about right.
Cheers,
josh
</TD></TR></TABLE>
Regarding how much leaner/richer:
Depends on if any cats are in the way, and the age of the sensor. When tuning, it is best to compare your numbers with the shops numbers before relying on the graph numbers. Ask your local shop to buy a second wideband (LM1, PLX, whatever) to verify that their numbers are on. Ask how old their sensor is, etc.
As for reading "later", 200-300rpm is about right.
Cheers,
josh
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Re: Accuracy of Dyno shop widebands....? (Hondaddict)
I used Inline Pro's dyno to tune my car and I compared my FJO vs. their muffler sniffer which came out perfect dead on reading on both system.
If you have a cat in your exhaust system, the reading from the tail pipe might be alittle off compare to a wideband that hook up before the cat.
If you have a cat in your exhaust system, the reading from the tail pipe might be alittle off compare to a wideband that hook up before the cat.
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