Does this dyno sheet look ok?
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Joined: May 2022
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Does this dyno sheet look ok?
Recently dynoed, just getting an opinion if the AFR and the tq/hp graphing looks good. Pull was done in 3rd on my base A6 LS3. We noticed a misfire, I found it to be an injector, replaced and runs great and no misfire now. Going back this weekend to give it another run and make sure everything looks good. Tuner said it took all the timing he could give it.
Le Mans Master
Joined: May 2005
Posts: 7,912
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From: Cypress TX
Why third gear? That will throw off the numbers. I thought 4th gear in the autos was required since it's the closest to 1:1 ratio. Manuals are all dynoed in 4th gear also since it's true 1:1 ratio..
Hydra-Matic 6L80
1st Gear 4.03:1
2nd Gear 2.36:1
3rd Gear 1.53:1
4th Gear 1.15:1
5th Gear 0.85:1
6th Gear 0.67:1
Reverse Gear 3.06:1
Final Drive Ratio 2.56
Manual 6 Speed:
1st Gear 2.66:1
2nd Gear 1.78:1
3rd Gear 1.30:1
4th Gear 1.00:1
5th Gear .74:1
6th Gear .50:1
Reverse Gear 2.90:1
Final Drive Ration 3.42
Hydra-Matic 6L80
1st Gear 4.03:1
2nd Gear 2.36:1
3rd Gear 1.53:1
4th Gear 1.15:1
5th Gear 0.85:1
6th Gear 0.67:1
Reverse Gear 3.06:1
Final Drive Ratio 2.56
Manual 6 Speed:
1st Gear 2.66:1
2nd Gear 1.78:1
3rd Gear 1.30:1
4th Gear 1.00:1
5th Gear .74:1
6th Gear .50:1
Reverse Gear 2.90:1
Final Drive Ration 3.42
Last edited by VetteVinnie; Sep 19, 2022 at 10:52 AM.
Thread Starter
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Joined: May 2022
Posts: 74
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Does seem low to me, plus I had a bad injector, going to redyno and fine tune anything needed this weekend, I’ll post results. He said there’s about an 8% lower power reading dynoing in 3rd.
He stated 3rd because the tune is the same but it puts undue stress on the dyno and vehicle, is what I was told. When he was done he took it for a ride and made any changes necessary as well.
I think my 1 7/8” LTs are hurting my tq down low, should be 1 3/4” for my power level but I didn’t put them on, so be it.
He stated 3rd because the tune is the same but it puts undue stress on the dyno and vehicle, is what I was told. When he was done he took it for a ride and made any changes necessary as well.
I think my 1 7/8” LTs are hurting my tq down low, should be 1 3/4” for my power level but I didn’t put them on, so be it.
Race Director
Joined: Dec 2013
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Not a fan of looking at the HP or torque numbers since ways to spoof them or will be different for each different type of dyno, but the curves really over all instead.
He did a good job of cleaning up the curves up to 5.8K, but motor went winded/stated to loose power at 6K that he did not resolve by leaning out the motor from that point upwards. But being an A-6 that is going to want to shift at 6K, really does not mater, unless your doing a tans tune to get the trans to shift a little later instead.
He did a good job of cleaning up the curves up to 5.8K, but motor went winded/stated to loose power at 6K that he did not resolve by leaning out the motor from that point upwards. But being an A-6 that is going to want to shift at 6K, really does not mater, unless your doing a tans tune to get the trans to shift a little later instead.
Thread Starter
Advanced
Joined: May 2022
Posts: 74
Likes: 19
Not a fan of looking at the HP or torque numbers since ways to spoof them or will be different for each different type of dyno, but the curves really over all instead.
He did a good job of cleaning up the curves up to 5.8K, but motor went winded/stated to loose power at 6K that he did not resolve by leaning out the motor from that point upwards. But being an A-6 that is going to want to shift at 6K, really does not mater, unless your doing a tans tune to get the trans to shift a little later instead.
He did a good job of cleaning up the curves up to 5.8K, but motor went winded/stated to loose power at 6K that he did not resolve by leaning out the motor from that point upwards. But being an A-6 that is going to want to shift at 6K, really does not mater, unless your doing a tans tune to get the trans to shift a little later instead.
He did a trans tune as well, turned off TQ management, but I’m going to have him put it back and just reduce it a bunch.
I’ll see if it clears up on the top end after I fixed the injector and redyno it.
Melting Slicks
Joined: Jun 2005
Posts: 2,396
Likes: 52
From: Sicamous BC
Not uncommon to see the torque dip in that area, your tuner might have focused on that trying timing & AFR. Your pk torque is 4.5k, that area will be the richest fuel & least timing, from there you can start leaning the fuel & adding timing until peak HP. By this time your tuner will be doing overlays of the ramp runs & be able to see if anything is helping that dip @ 4krpm. If you compare your torque numbers @ 4k it improved on the last sheet.
My guess is that is a good as it gets & not something you would feel as the motor is accelerating so fast going thru it.
Because how DJ dyno calculates power gear ratio skew the power numbers, unless you are fretting peak number it does not matter. Gains & losses are what you really want to see. Consistency with repeatable result is the battle with a dyno & operator.
My guess is that is a good as it gets & not something you would feel as the motor is accelerating so fast going thru it.
Because how DJ dyno calculates power gear ratio skew the power numbers, unless you are fretting peak number it does not matter. Gains & losses are what you really want to see. Consistency with repeatable result is the battle with a dyno & operator.
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