I know a little about how an engine makes torque and HP, nowhere near as much as some.
But you see results posted on other forums, yutube or advertising and there are some big HP/KW @the wheel figures coming up on dyno graphs with just basic engine work, like a cam and tune or ported heads, cam and tune. I realize that there are many different exhaust and OTR induction setups and other small sundries like under drive pulleys, throttle bodies, valve springs, push rods so on, of all different makes to assist in the results.
But I’m assuming to achieve the said easy done high KW @ ATW results requires major engine rebuilding and engineering to produce. And to achieve genuine high values, it becomes a serious task to get there and big $.
Would be interesting to run several cars over several dyno’s, and see how big a discrepancy there was over the HP recorded on each machine.
I’m sure some of the more educated engine builders here, must take some of the results they see out there with a grain of salt.
Footnote,
This is not a dig at any institution or organization. Some of the experienced people here, who know engines may enlighten some of us, not so savvy people, on the true amount of work required to achieve these results.
Also, I think there is a formula to estimate how quick you will get down the quarter mile ( I may be wrong on this) with the known power, weight, and reaction time . I seriously doubt some of these cars would go too close, to the numbers presented.
Chassis (ATW) Dyno Results. Big # for Little Work.
Started by
_walkinshaw_
, Jan 17 2013 02:13 PM
5 replies to this topic
#2
orangeLJ
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Posted 17 January 2013 - 02:27 PM
I've said time and time again, Dynos aren't for comparing power outputs.
there is way too many variables and patented software algorithms for results to ever be directly comparable if done on different dynos.
A dyno, to me, is a tuning tool. Its for making sure you get the maximum power (safely) and driveability from your combo.
Saying "my car made XX on this dyno and then made less on the other dyno so the dyno is wrong" is just stupid. The Dyno is right, you're just being ignorant (not directed at youwalkinshaw, just the neanderthols in general)
I think way too many people get caught up in HP figures.
there is way too many variables and patented software algorithms for results to ever be directly comparable if done on different dynos.
A dyno, to me, is a tuning tool. Its for making sure you get the maximum power (safely) and driveability from your combo.
Saying "my car made XX on this dyno and then made less on the other dyno so the dyno is wrong" is just stupid. The Dyno is right, you're just being ignorant (not directed at youwalkinshaw, just the neanderthols in general)
I think way too many people get caught up in HP figures.
#3
_434LX_
_434LX_
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Posted 17 January 2013 - 02:37 PM
Agreed Orange,
A dyno is a fantastic tool to tune a car under load, especially where A/F ratios and ignition curves are concerned.
Also a good idea to use the same one when doing power mods to give an accurate comparison.
As far as dyno shootouts go, I'm no expert, but I think they use a standard program for all shootouts ? Someone may want to correct me on that.
A dyno is a fantastic tool to tune a car under load, especially where A/F ratios and ignition curves are concerned.
Also a good idea to use the same one when doing power mods to give an accurate comparison.
As far as dyno shootouts go, I'm no expert, but I think they use a standard program for all shootouts ? Someone may want to correct me on that.
#4
_walkinshaw_
_walkinshaw_
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Posted 17 January 2013 - 02:52 PM
orangeLJ
I hear what you say. And you’re very right in the use of the chassis dyno as a tool to tune.
But what I’m kind of alluding to is the results of the tune from work done to the car are very impressive.
Starting out with the stock motor, performing said work and then the tune showing the result.
Can these results (HP/KW) figures be achievable?
In regards to the dyno’s, if you had 5 identical dyno’s lined up and rolled one or more cars onto each dyno (each car goes over the 5 dyno’s) should you end up with a reasonably close average inregards to there resaults.
Or are the 5 identical dyno's all installed and set and operated up very differently to each other.
I hear what you say. And you’re very right in the use of the chassis dyno as a tool to tune.
But what I’m kind of alluding to is the results of the tune from work done to the car are very impressive.
Starting out with the stock motor, performing said work and then the tune showing the result.
Can these results (HP/KW) figures be achievable?
In regards to the dyno’s, if you had 5 identical dyno’s lined up and rolled one or more cars onto each dyno (each car goes over the 5 dyno’s) should you end up with a reasonably close average inregards to there resaults.
Or are the 5 identical dyno's all installed and set and operated up very differently to each other.
#5
_injlc304_
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Posted 17 January 2013 - 03:22 PM
gotta remember you can pull big numbers out of new motors... bro got cam, exhaust and intake done on his 6lt marloo and got 446rwhp!!!! i stroked my 304 to 355, cam, headwork blah blah blah and only got 288rwhp for double what he paid to get his done. i know i got ripped etc on it.
but still dyno numbers are only dick measuring tools if you ask me. people might get big dyno numbers but run slower on the 1/4mile then me...
but still dyno numbers are only dick measuring tools if you ask me. people might get big dyno numbers but run slower on the 1/4mile then me...
#6
_Quagmire_
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Posted 17 January 2013 - 03:45 PM
you can only compare before and after results on the same dyno
otherwise you may as well compare apples to potatoes
otherwise you may as well compare apples to potatoes
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