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Will a car run richer on the street or dyno?

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Old 07-14-2002, 06:19 PM
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Default Will a car run richer on the street or dyno?

I can't remember if the car will run richer on the street or the dyno because of load? Which is it?
Old 07-14-2002, 07:54 PM
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Default Re: Will a car run richer on the street or dyno?

Well.. technically it's under load on the dyno.. maybe it has something to do with air moving into the intake.
Old 07-14-2002, 09:04 PM
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Default Re: Will a car run richer on the street or dyno?

At a given calibration you will run nominally richer on the dyno since the load approximates a 2600lb inertial mass. Your car is of course heavier, so the load is greater when you are on the street (accelerating the car as opposed to a drum).

Chris
Old 07-14-2002, 10:42 PM
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Default Re: Will a car run richer on the street or dyno?

They entered a 3650lb load into the dyno. It was an eddy-current dyno not a dynojet.
Old 07-14-2002, 11:02 PM
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Default Re: Will a car run richer on the street or dyno?

If the load is equivalent then the a/f ratio should also be equivalent.

Chris
Old 07-15-2002, 10:37 PM
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Default Re: Will a car run richer on the street or dyno?

Based on what I've seen(on a Dynojet), you'll usually run approximately .2 richer on a dyno than the street. You get a bit more airflow on the road and it leans things out a bit.
Old 07-16-2002, 05:35 PM
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Default Re: Will a car run richer on the street or dyno?

This is what happened to me. Dyno tuned great. Got it on the street and running a little lean. Did minor tweaks while running on the street to fine tune the dyno tune and get rid of the KR I got (had none on the Dyno).

Seems to help to do minor tweaks with a load on the car as you have when on the street.

- Tom




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