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Loss of 22.5% HP

I would recomend doing a baseline dyno first, then do one with mods. This is the only way to truly know what gains you are getting

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Old 08-14-2009, 09:24 AM   #1 (permalink)
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I would recomend doing a baseline dyno first, then do one with mods. This is the only way to truly know what gains you are getting
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Old 08-14-2009, 09:32 AM   #2 (permalink)
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I would recomend doing a baseline dyno first, then do one with mods. This is the only way to truly know what gains you are getting
That's what I'm doing. Baseline tomorrow, dyno after intakes in 2 weeks, and then again after FI CBE.
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Old 08-14-2009, 09:51 AM   #3 (permalink)
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And of course the baseline dyno and subsequent dynos must be performed on the same machine. Otherwise it's totally pointless.
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Old 08-14-2009, 09:59 AM   #4 (permalink)
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And of course the baseline dyno and subsequent dynos must be performed on the same machine. Otherwise it's totally pointless.
Gentlemen... I am not a noob.
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Old 08-15-2009, 10:34 AM   #5 (permalink)
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And of course the baseline dyno and subsequent dynos must be performed on the same machine. Otherwise it's totally pointless.
Even then, taken the same day, within the same part of the day if possible.
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Old 08-15-2009, 01:27 PM   #6 (permalink)
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thanks fellas for all your input. This is why I asked the question because I really didnt believe the loss myself. I will stick with one dyno the whole way through.
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Old 08-21-2009, 08:02 PM   #7 (permalink)
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I dynoed my car on a Dynojet today and the weather conditions were 90 F 29.91 Hg. I don't think they used fans. My best run was 272.17HP and 221.93 Torque. Despite the weather conditions, doesn't that seem awful low?
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Old 08-21-2009, 09:26 PM   #8 (permalink)
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I dynoed my car on a Dynojet today and the weather conditions were 90 F 29.91 Hg. I don't think they used fans. My best run was 272.17HP and 221.93 Torque. Despite the weather conditions, doesn't that seem awful low?
No. That's in the range of stock whp on a DynoJet. It's not the highest but that could definitely be a result of the conditions.
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Old 08-14-2009, 10:23 AM   #9 (permalink)
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Sigh. Different dyno's read different numbers - ESPECIALLY if a load is put onto it! A Mustang or Dyno-Dynamics dyno will generally read low. Altered Atmosphere's dyno is a Dynojet dyno, which doesnt put a load on the motor. They always read higher than others. I will put money that the OP's dyno was a dyno of the type that puts a load on the driveline.
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Old 08-14-2009, 10:36 AM   #10 (permalink)
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I will put money that the OP's dyno was a dyno of the type that puts a load on the driveline.
And that would be an excellent bet. 258whp is exactly what our bone stock 370Z made on our Dyno Dynamics.



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Old 08-14-2009, 03:03 PM   #11 (permalink)
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The best thing you can do is pick a shop/dyno and stick with it for the life of the car. I did my baseline with a dyno dynamics at a certain shop and will be going whenever I feel I need to re-dyno my car after an upgrade or need a tune from them.
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Old 08-14-2009, 03:12 PM   #12 (permalink)
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Contact some of the board members, they have some great Paint dynos, best numbers yet.
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Old 08-14-2009, 05:50 PM   #13 (permalink)
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To add to Ryan's reply...

Hub dynos, such as the DynaPack, will be more consistent from test to test than roller dynos. With roller dynos, you can have differing air pressures in the tires, the dyno monkey can strap a car down harder one day and lighter the next, etc. Hub dynos remove at least that portion of the variability. What's left is a solid drive train that should give you results well within the statistical error range of the dyno itself (0.5-1%ish range). A roller dyno can easily give you errors in the 5% range if not set up consistently.

Whatever style you choose to take a baseline on, stay with it after modding to see what gains you achieved. If it's a roller dyno, I suggest 2-3 different days (with hopefully different guys setting it up) to average out inconsistencies in setup. Yes, this obviously gets expensive on a roller dyno, but if you want solid numbers you can either do it that way or go with a hub dyno. The same thing should be done after the mods are in place to see what was gained. If you go from one style to another, you need to take another baseline. Mustang dynos are notoriously low in numbers, but that doesn't mean they're wrong, and hub dynos are typically the highest values. You cannot compare one person's Mustang dyno to another's hub dyno run and expect to compare apples to apples.
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