Re: STUSKA ENGINE DYNOMOMETERS???
[Re: Labratt]
#1291080
08/25/12 01:51 PM
08/25/12 01:51 PM
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Joined: Aug 2003
Posts: 43,195 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
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Quote:
Anyone here..besides Randy Johnson(Dartin)ever had an engine on one?...what was your opinion of it,as far as accuracy goes? I'm just curious! Thanks in advance! Randy
I have had motors on the local Studka as well as on several different DTS and a Superfow, there all measuring devices Make sure the dyno operator and the dyno are current on the mandatory software upgrades and are willing to calibrate the dyno for your motor, see if they use a flywheel or not on thiers The local one didn't use a flywheel until we did one of my motors on thier dyno with a 30 lb. flywheel on it, you have to add the flywheel weight into the software tables The flywheel helps the motor to not accelerate rapidily when the dyno operator opens the throttle quickly, it wll not control the acceleration as quickly as it will with the flywheel on, it will rev way past the preset bottom RPM start limits and it takes a short while for the Studka dynos to pull the motor back below the starting RPM. The DTS do a lot better job of controlling this I try to use the flywheel that will be on the motor so why not duplicate what it will be in the car Is this your first time dyno tetsing a motor? If so let us know what you think when done My pucker factors goes to the moon every time they start a pull Even after hundreds of pulls There are two methods to do the dyno test pulls, manually and automated, I like the automated They can set the acceleration rate also, from 100 RPM per second to 1000 RPM per second, I think these numbers are accurate on the Studka software settings I think the industry standard is either 300 RPM per second or 600 RPM per second Each pulls takes longer at 300 per versus 600 per Have them do two pulls with no changes other than using 300 per and 600 per second recording rate and look at both sheets to see what differences there are and then decide which rate you want to use
Last edited by Cab_Burge; 08/25/12 02:46 PM.
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: Cab_Burge]
#1291081
08/25/12 02:13 PM
08/25/12 02:13 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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The dyno in question uses no flywheel... it has its own starter... he does use the auto mode for the acceleration rate on the pulls... I'm sure I seen 600 as the rate when I was on it
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: MR_P_BODY]
#1291082
08/25/12 02:39 PM
08/25/12 02:39 PM
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Joined: Aug 2003
Posts: 43,195 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
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Quote:
The dyno in question uses no flywheel... it has its own starter... he does use the auto mode for the acceleration rate on the pulls... I'm sure I seen 600 as the rate when I was on it
All of the dyno I've used have thier own starters on the dyno driveshafts or internally, none of them used the starter to operate the flywheel ring gear to start the motors I've used both the 300 per and the 600 per, not sure which one we ended up using OP, make sure that the dyno sheets show that the HP and torque are equal at 5250 RPM If not something is wrong with that dyno or the software set up on it I just remember another thing about the recording rate, it can capture and record information from 50 RPM increments up to whatever the upper levels are. I like 100 RPM increments, some people like 50 RPM increments I've had both, as I said I like and use the 100 RPM setting One last thing is the start and finish RPM, I like to start off the first pulls with 2500 or 3000 RPM for the lower limits and 5000 or 5500 RPM for the upper limit. If the motor is new it will take anywheres from 5 to 12 full pulls to seat the rings and quit gaining power on each pull Once it levels off(repeats within 1% ) we will look at the results and then decide to change the RPM settings, if it is a street motor with a 3000 RPM converter we may leave the lower RPM limit at 3000 RPM and raise the upper to 6000 RPM if the motor shows that it is still gaining HP at the old upper RPM limit. I try to use 500 RPM above the peak HP settings for the upper RPM stop settings, I have seen jetting make the peak HP setting RPM increase, go up from 5900 RPM to 6300 RPM I've also seen almost no change in power and torque from 6500 RPM to 7200 RPM on a race motor with high compression and a big cam I like to raise the upper RPM until I see a difenint(SP?) falling off of the motors peak HP RPM. Good luck, have fun
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: Labratt]
#1291086
08/25/12 07:13 PM
08/25/12 07:13 PM
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Joined: Feb 2005
Posts: 4,314 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,314
Prospect, PA
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Quote:
Anyone here..besides Randy Johnson(Dartin)ever had an engine on one?...what was your opinion of it,as far as accuracy goes? I'm just curious! Thanks in advance! Randy
Yes. I like it and will continue to do back to it/him. It is as much the operator as the equipment. The owner/operator I use is small time, and a Pontiac guy. He sells nothing but dyno time.
I dont know if it is accurate, but it was very, very consistent. My engine sat on the dyno for a week and I made a lot of changes (carbs, intakes, intake modifications, spacers, and lash) and a lot of pulls. About 1/3 of the pulls were duplicate runs just so I could convince myself that the results were repeatable, adding validity to the results observed for each change.
I run regularly with 3 other guys that have dyno results for their engines from nationally recognized shops. I have their dyno sheets in my possession, and their car weights. Based on their data, they should all be faster than me. None of them are.
But don't lose perspective on what a dyno is; a tool. If you are not going to use it as a tool, why spend the money, as the numbers mean little otherwise. The only numbers that have meaning you'll find on your time slip.
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: jake4cars]
#1291088
08/26/12 04:18 PM
08/26/12 04:18 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I would rather have it close or even a bit stingy on the numbers than some of the dyno numbers I have heard on here and knowing what the car ran... I dont care about some big BS number and the car will never see it on the track
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: quickd100]
#1291090
08/26/12 11:57 PM
08/26/12 11:57 PM
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Joined: Jan 2003
Posts: 75,020 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
Final numbers are nice to brag about but most people miss the point of using a dyno to tune a motor. It's the change you see from start to finish, finding out what the motor wants and what doesn't work. As long as the dyno is repeatable it doesn't matter which brand you use. Dave
The Dyno is a tool, use it wisely.
The ultimate gauge of Hp is what it runs when installed in the car and run at the track. An engine could make 900HP on the dyno but a run at the track could show it only making 600 ... which do you believe ?
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: quickd100]
#1291091
08/27/12 12:15 AM
08/27/12 12:15 AM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
master
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master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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I hired a shop that uses Stuska dyno to show this engine was ready to go for the buyer. Since it was sold pending the dyno runs, I was a little nervous when it hit the upper rpm range. The guys there wanted to run it a little higher and I said no. It is going into a show car! This dyno was manually loading, and the owner said it is conservative compared to some others. http://www.youtube.com/watch?v=B__c9JhjJlo&feature=channel&list=UL
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: Labratt]
#1291094
08/27/12 10:10 AM
08/27/12 10:10 AM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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I own a SF-Powermark dyno and I think the most important numbers are the average HP and torque over the sweep area. Having a higher average will be faster than having a higher peak power. Sweep rate shouldn’t matter if the software compensation is correct.
Joe
FYI 1% is way too much variation, run to run, for a good dyno.
Without Data, you’re just another guy with an opinion.
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: moderncylinder]
#1291096
08/27/12 10:47 AM
08/27/12 10:47 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
how much is it for a day on st clair's dyno?
400? 500? 600?
$500
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: viperblue72]
#1291097
08/27/12 01:03 PM
08/27/12 01:03 PM
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Joined: Sep 2009
Posts: 2,325 Clinton Twp... north of Deetro...
Labratt
OP
Good Ol Randy B!
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OP
Good Ol Randy B!
Joined: Sep 2009
Posts: 2,325
Clinton Twp... north of Deetro...
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Chad Lee,I want my freshly built motor broken-in BEFORE installing it back in my GTX. My main reason to dyno it is to make sure there are NO PROBLEMS with oil pressure issues..oil leaks,etc.,etc! How much power it makes is SECONDARY to me. I'm sure with Jeff's head work...and nice ROUND cylinders,she'll do just fine! Having the person that put the bottom end together,pulling the levers on the dyno,is another good reason! I call it "insurance"! From the responses I'm getting,sounds like the Stuska is slanted a bit toward the stingy side...which to me,is preferable. I had the engine tune pretty well dialed-in,before Jeff did the heads. I'm sure it'll be a whole new ball game now!...just ANOTHER GOOD REASON to "Dyno-Tune" it,before installation! In my opinion..$500.00 well spent,for sure!
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Re: STUSKA ENGINE DYNOMOMETERS???
[Re: Labratt]
#1291098
08/27/12 01:10 PM
08/27/12 01:10 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... From the responses I'm getting,sounds like the Stuska is slanted a bit toward the stingy side...which to me,is preferable.
Not from my experience, since the Stuska / DePac system I tested on seemed to kick out results about 10% higher than the SuperFlow I tested on a few years later.
However, this just reinforces the belief that you should really never try to compare the results from two different dynos unless you can test the same engine on both to verify consistency.
As others have said before, a dyno is just another tool and should be used accordingly.
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