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Re: Dyno Gurus Advice Needed!!!
[Re: Dunnuck Racing]
#1297224
09/04/12 07:41 PM
09/04/12 07:41 PM
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Joined: Jan 2003
Posts: 5,486
SoCal
Brian Hafliger
master
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master
Joined: Jan 2003
Posts: 5,486
SoCal
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Very true. The engine can run in terrible weather, but the CF will compensate for that. It will however affect the overall tune of the engine...in other words if you tune for terrible weather, and the run it in good weather it'll be very lean.
Get to know your dyno guy and others that have used him. Then make your decision.
Brian Hafliger
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Re: Dyno Gurus Advice Needed!!!
[Re: Brian Hafliger]
#1297225
09/04/12 08:23 PM
09/04/12 08:23 PM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
OP
top fuel
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OP
top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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This is very helpful information so far. If we can all learn at least a little we will know we are getting honest numbers.Also having honest numbers on Horse-Power & Torque & weight of car is a Big + in getting the converter set up right.
Its also nice to know the new engine or new engine build is making the Horse-Power you paid for it to be.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: Dyno Gurus Advice Needed!!!
[Re: Brian Hafliger]
#1297227
09/04/12 08:58 PM
09/04/12 08:58 PM
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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i've dyno'd engines at several different facilities over the years that range from state of the art to the most basic bare bones types. i know of one shop that has a duct from their A/C going into the carb hat. they tell me horsepower sells engines. it does, but only when you can get the same power at the track.
it's one thing to calibrate the load cell, but that's only one of several things that will determine a correction factor and final numbers. i've been in facilities that don't even have a clue as to what a phsycrometer is. a dyno is only as good as the information that's fed into it. garbage in, garbage out. over the years i've seen many a member claim great dyno numbers, only to fall way short of expectaions at the track, one of those is fairly recent.
the best advice i can give is to ask the operator if the load cell is calibrated, check to make sure the baromter is accurate, take a wet bulb (phsycromter) reading, use the correct s/g reading for the ful being used, use a consistent rpm/ second while tuning, don't change in the middle of tuning. make sure the dyno repeats with no other changes being made. hopefully you'll get good, consistent numbers that the track will substantiate. i left a couple of other things out but you get the idea.
machine shop owner and engine builder
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Re: Dyno Gurus Advice Needed!!!
[Re: Performance Only]
#1297229
09/04/12 09:53 PM
09/04/12 09:53 PM
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Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
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Quote:
i've dyno'd engines at several different facilities over the years that range from state of the art to the most basic bare bones types. i know of one shop that has a duct from their A/C going into the carb hat. they tell me horsepower sells engines. it does, but only when you can get the same power at the track.
it's one thing to calibrate the load cell, but that's only one of several things that will determine a correction factor and final numbers. i've been in facilities that don't even have a clue as to what a phsycrometer is. a dyno is only as good as the information that's fed into it. garbage in, garbage out. over the years i've seen many a member claim great dyno numbers, only to fall way short of expectaions at the track, one of those is fairly recent.
the best advice i can give is to ask the operator if the load cell is calibrated, check to make sure the baromter is accurate, take a wet bulb (phsycromter) reading, use the correct s/g reading for the ful being used, use a consistent rpm/ second while tuning, don't change in the middle of tuning. make sure the dyno repeats with no other changes being made. hopefully you'll get good, consistent numbers that the track will substantiate. i left a couple of other things out but you get the idea.
Just out of interest, what is a Phsycrometer Dan? I have never heard of it
Alan Jones
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Re: Dyno Gurus Advice Needed!!!
[Re: LA360]
#1297230
09/04/12 10:05 PM
09/04/12 10:05 PM
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Joined: Aug 2003
Posts: 43,228
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Quote:
Quote:
i've dyno'd engines at several different facilities over the years that range from state of the art to the most basic bare bones types. i know of one shop that has a duct from their A/C going into the carb hat. they tell me horsepower sells engines. it does, but only when you can get the same power at the track.
it's one thing to calibrate the load cell, but that's only one of several things that will determine a correction factor and final numbers. i've been in facilities that don't even have a clue as to what a phsycrometer is. a dyno is only as good as the information that's fed into it. garbage in, garbage out. over the years i've seen many a member claim great dyno numbers, only to fall way short of expectaions at the track, one of those is fairly recent.
the best advice i can give is to ask the operator if the load cell is calibrated, check to make sure the baromter is accurate, take a wet bulb (phsycromter) reading, use the correct s/g reading for the ful being used, use a consistent rpm/ second while tuning, don't change in the middle of tuning. make sure the dyno repeats with no other changes being made. hopefully you'll get good, consistent numbers that the track will substantiate. i left a couple of other things out but you get the idea.
Just out of interest, what is a Phsycrometer Dan? I have never heard of it
A dual bulb sling phsycrometer are used to determine the humidity, my first weather station had one instead of a cheap humidity gauge. You where instructed to wet one bulb and sling it around in the air your racing in for thirty seconds or so and take a reading on the difference between the wet and dry bulb, use the enclosed chart with it to get the humidity. Do that three times quickly to validate your results  It use to be harder to keep weather records, now its push some buttons and store it
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Dyno Gurus Advice Needed!!!
[Re: Old School]
#1297232
09/06/12 01:04 PM
09/06/12 01:04 PM
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Joined: Feb 2008
Posts: 715
Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 715
Central TEXAS!!!!
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When someone leaves my dyno, they have a CD with all the data on it, RAW, corrected and every factor that went into getting those numbers. Along with a copy of the windyn software to look at it any way they want.
As far as slinging a phsycromter around, nope I don’t do it. The SF Powermark was made this decade and all weather readings are taken by sensors, in real time. In fact, if the air was to change in the middle of a pull (unlikely) then the correction factor would change. (raw numbers wouldn’t)
Since you are going to a dyno to collect data on how your engine runs, I can’t see a reason why you shouldn’t leave with a ***load of info.
Joe
Without Data, you’re just another guy with an opinion.
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Re: Dyno Gurus Advice Needed!!!
[Re: sr4440]
#1297233
09/06/12 05:41 PM
09/06/12 05:41 PM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
OP
top fuel
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OP
top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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Since you are going to a dyno to collect data on how your engine runs, I can’t see a reason why you shouldn’t leave with a ***load of info. That's what I am looking for when I have one dynoed...useful info.! I know nothing about running or setting up a dyno,but wanted to get a little info. to make sure it was being done right. I have heard a lot of talk about Happy Dyno's  and it never hurts to have a little knowledge of what's going on. I would hate to buy or have a engine built and they dyno the engine and it shows 800 hp and it only makes 650 hp.But after reading most post I feel my chances of getting a fairly honest dyno test results are a lots better.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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