5spd GT said:In that case I whole heartly agree with you, however that is not the point of this thread.
I'm talking if you were to add a horsepower adding modification, what would be a better way to show an increase/decrease. One with less variables to control or one with more to control (aka: dyno or track).
5spd GT said:I'm aware you don't like me. No need to repeat, unless you want to of course
Look Its Aaron said:View attachment 497848 I have nothing against you...
Michael Yount said:You still haven't answered the one simple question I've asked 5 spd -- how much road racing experience do you have to base your 'there must be more variables' thought on?
Michael Yount said:Your original premise was basically track or dyno -- you don't have to try and optimize your use of the track (that is try to turn the best lap or run time) in order to use the track to monitor the effect of changes. The key to using the track is to alter how you drive to eliminate variables. It can be done and is regularly done at both the strip and the road course. Most all of the variables can be minimized by the driver to the point that meaningful data is obtained. They can also be minimized for the dyno runs -- however, that's not in the complete control of the driver. You have to 'trust' a BUNCH of stuff from the dyno operator. And my experience has been that many times -- they either don't want you to know, or they simply just don't know enough themselves about how the system even works to help you with that. When something as simple as strap down technique and tension can result in a 15HP difference -- well, that's a problem....
Michael Yount said:By the way - the Mustang Dyno's are eddy current -- tell 'em what number you want, and they can get it for you. Over and over again. If that's what you mean by repeatable and consistent -- go for it.
Michael Yount said:5spd - tell us all about your road racing experience. What kind of car? What sanctioning body? How many seasons have you raced? Did you build/tune the car yourself? What were your results like? What driving schools did you go to? We need that information to put your comments about the variables present in that kind of racing in perspective. I suspect the reason you can't believe I'm debating it with you is because you have no experience road racing. Am I wrong?
Woodrow said:The track can be just as good as the dyno for the avg. joe if you take down the weather conditions so you can calculate the corrected altitude ect.
Woodrow said:Also the trap speed is the avg of the last 66ft (I forget), so your 60’s and et maight be off but the mph should be about the same for most of the runs. For instance everyone talks about fast cars that are slow take a Z06 for instance most with a marginal driver runs 12.50’s to 12.80’s ok but if you look at their trap speed its all around 111-114 indicating thru the use of a ¼ to hp cal that you are indeed making about the said 400 at the crank. Combine that with your corrected altitude number and compare the results. Its cheeper and more fun than your beloved dyno.
Michael Yount said:One variable we haven't talked about is automatic trannies. The majority of cars sold have them -- and the majority of serious drag racers run them. They give dynos fits for repeatablity - especially with the loose converters that most drag racers use. I've seen a number of back to back pulls - same car/no changes between pulls - with pretty signficant differences both in the peak numbers and in the curve. Track's probably gonna work better for you in that situation -- and the auto tranny usually allows for more consistency/less driver variability at the track. Which is of course why so many people use them.
2000xp8 said:On the original topic, the track tells the whole truth. The timeslip can be anaylzed to see if there was driver error.
The track should be the bragging rights, for either a quick ET or a high MPH.
Not the dyno, they are too inconsistant, and should be used for tuning purposes not to show up one of your buddies or come here and tell us how fast your car should be.
5spd GT said:What about track prep, shifting at the same rpm (exactly), shifting the same speed, engaging/disengaging the clutch the same, headwind, etc...the dyno doesn't have to deal with those.
Yep, the mph should be "about" the same. You said it yourselfThey can be thrown off greatly depending on how bad the mistake is in that 60ft.
Actually most zo6's run 12.3-12.5's with good drivers and trap 117mph or so. Your numbers are bit low. I have always been the one to emphasize track mph...and not E.T. I'm very aware of that.
Beloved dyno?
I simply said, if you were to add a horsepower producing mod...what has less variables to deal with so you can see a more accurate gain? The dyno or track?
Beloved? Funny, that is what my name means
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