Dyno Questions
Thread Starter
Drifting
Joined: Jul 2002
Posts: 1,386
Likes: 80
From: NC
Cruise-In IV Veteran
St. Jude Contributor
Dyno Questions
I have dyno'd my car on two different Dynojet dynos in my local area. The results of my second dyno day are very different from the first.
My first dyno day produced a dyno chart where my HP and TQ numbers crossed at approx. 5250 RPM.
At my second dyno day yesterday with the same car and no additional mods produced a dyno graph where my HP and TQ numbers crossed at 4840 RPM. The dyno shop was dyno'ing my A4 in 2nd gear. Knowing that the tranny gearing is a 1:1 ratio in 3rd I had them do a dyno run in 3rd. The graph for the 3rd gear pull resulted in the HP and TQ crossing at just over 6000 RPM.
Now with an A4 I know it's a not as easy to dyno because of the shifting characteristics of the tranny. However like my first dyno day shouldn't my HP and TQ numbers still cross at around 5252 RPM regardless? All of the MN6 cars that dyno'd yesterday had their respective HP and TQ curves cross at approx. 5250 RPM.
For yesterday's dyno day is there a correction factor or adjustment not set with their Dynojet? If so what is the correction factor and can it be applied to the numbers I have?
Is there something about the TQ converter I need to take into consideration?
My first dyno day produced a dyno chart where my HP and TQ numbers crossed at approx. 5250 RPM.
At my second dyno day yesterday with the same car and no additional mods produced a dyno graph where my HP and TQ numbers crossed at 4840 RPM. The dyno shop was dyno'ing my A4 in 2nd gear. Knowing that the tranny gearing is a 1:1 ratio in 3rd I had them do a dyno run in 3rd. The graph for the 3rd gear pull resulted in the HP and TQ crossing at just over 6000 RPM.
Now with an A4 I know it's a not as easy to dyno because of the shifting characteristics of the tranny. However like my first dyno day shouldn't my HP and TQ numbers still cross at around 5252 RPM regardless? All of the MN6 cars that dyno'd yesterday had their respective HP and TQ curves cross at approx. 5250 RPM.
For yesterday's dyno day is there a correction factor or adjustment not set with their Dynojet? If so what is the correction factor and can it be applied to the numbers I have?
Is there something about the TQ converter I need to take into consideration?
Instructor
Joined: Nov 2001
Posts: 154
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From: Make it 3 yards motherf**ker and we'll have us an automobile race.
Re: Dyno Questions (bgood)
Hp and torque always cross at 5250. Check your dyno graph , the only time I've seen this happen was when there is a different scale for hp and torque on each side of the graph. For example; the HP scale might go from 200 to 400 on one side of the graph while the torque scale might go from 200 to 450 on the other side.
Thread Starter
Drifting
Joined: Jul 2002
Posts: 1,386
Likes: 80
From: NC
Cruise-In IV Veteran
St. Jude Contributor
Re: Dyno Questions (butcher)
Hp and torque always cross at 5250. Check your dyno graph , the only time I've seen this happen was when there is a different scale for hp and torque on each side of the graph. For example; the HP scale might go from 200 to 400 on one side of the graph while the torque scale might go from 200 to 450 on the other side.
