I think we should get another dyno day rounded up again at the dyno shop (mustang muscle) in high ridge, Missouri. Its been a while since the last one. who would be interested in that?
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Dyno day needed in MO.
- Thread starter 98slushbox
- Start Date
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They usually have a few a year. Its been a while since the last one. I havent got to put mine on the dyno yet. I think usually when they have it, you get two or three runs on the dyno and its something like $45 to run.
well, didnt really plan on it, just thought would be nice to have another one, but i guess i could.
Heres the KC DYNO Thread on DTR.
http://www.dieseltruckresource.com/dev/showthread.php?t=77109
I'm in for St. Louis dyno, or back to KC again.
We need a month notice though, not a week... .
http://www.dieseltruckresource.com/dev/showthread.php?t=77109
I'm in for St. Louis dyno, or back to KC again.
We need a month notice though, not a week... .
turbolcc and I were discussing having another one at mustang muscle again the other night on the phone. My truck is down currently but i would still be interested in having one if we can get one in before it gets too cold. And i'm afraid with hunting season on hand, country boys like myself, it will be hard to get away on the weekend. I would still be game to have one though if we could get enough people to come to one.
. Can't beat MM's dyno price.
BKeence said:
Which it better is personal prefference...
Here is what I have come to understand, Though it may not be totally accurate
2 styles:
Load Dyno - Will load engine as if pulling a hill - Measures HP based upon amount needed to hold back truck to preset mph/per second, etc
Inertia Dyno - Measures HP based upon how fast you can turn a very large drum (usually 4ft round, 3k lbs) to max speed
My preference is the Load Dyno - So I spool my turbo better
Tommy,
That is a very good explaination. Although I would also like to add if I may,
Load dyno, will also do other things, it allows you to run true test and tune pass'. It will let you find little things in the engines performance such as a slight miss (mostly for gassers), it will allow you to find drivetrain issues. Example, we had a extremely highly tuned twin turbo 427 in a 92 camaro come out for a test and tune last month. Now on the street the car ran really good with the execption of some dialing in on electronics. But when it was strapped to the dyno it was discovered that the converter in the transmission was not at all what they had expected nor ordered. But like I said on the street they couldn't feel it. A load dyno will aslo simulate pulling a trailer, running a pass down a 1/8 or 1/4 mi track and at the exact same time you can tune the vehicle which obviously you can't do when it's actually moving down the street/track. A load dyno isn't based off a set of calculations set at a factory that attempt to compensate for parasidic (sp?) loss that covers every engine/drivetrain/tire selection for every application, instead it allows you to know what you are ACTUALLY putting to the pavement/dirt exactly. And lastly it is safer than an inertia dyno in several ways one of which is driver/vehicle safety. On an inertia dyno, if for what ever reason the operator of the vehicle should accidently hit the brake on the vehicle while making the pass you stand an unbeleivable risk of shooting off the dyno (no need to describle what could happen from there) that is mostly because that 4' diameter 3k plus drum can't stop instantly and laws of physics tells us that something has to come apart and fly. Now with a load dyno using a 12" dual roller if the same should happen the two rollers will slow down/stop and both driver and vehicle are in no danger.
Now I don't want to sound like I am bad mouthing inertia dyno's because I don't feel that way, I think they are a good method of ballparking your performance. But like everything in this world it all has to start somewhere, and I like to think that they were just the stepping stone for better more accurate technology to come foward. If load dyno's weren't the next step, then why is dynojet working on making load dyno themselfes?
Russell
That is a very good explaination. Although I would also like to add if I may,
Load dyno, will also do other things, it allows you to run true test and tune pass'. It will let you find little things in the engines performance such as a slight miss (mostly for gassers), it will allow you to find drivetrain issues. Example, we had a extremely highly tuned twin turbo 427 in a 92 camaro come out for a test and tune last month. Now on the street the car ran really good with the execption of some dialing in on electronics. But when it was strapped to the dyno it was discovered that the converter in the transmission was not at all what they had expected nor ordered. But like I said on the street they couldn't feel it. A load dyno will aslo simulate pulling a trailer, running a pass down a 1/8 or 1/4 mi track and at the exact same time you can tune the vehicle which obviously you can't do when it's actually moving down the street/track. A load dyno isn't based off a set of calculations set at a factory that attempt to compensate for parasidic (sp?) loss that covers every engine/drivetrain/tire selection for every application, instead it allows you to know what you are ACTUALLY putting to the pavement/dirt exactly. And lastly it is safer than an inertia dyno in several ways one of which is driver/vehicle safety. On an inertia dyno, if for what ever reason the operator of the vehicle should accidently hit the brake on the vehicle while making the pass you stand an unbeleivable risk of shooting off the dyno (no need to describle what could happen from there) that is mostly because that 4' diameter 3k plus drum can't stop instantly and laws of physics tells us that something has to come apart and fly. Now with a load dyno using a 12" dual roller if the same should happen the two rollers will slow down/stop and both driver and vehicle are in no danger.
Now I don't want to sound like I am bad mouthing inertia dyno's because I don't feel that way, I think they are a good method of ballparking your performance. But like everything in this world it all has to start somewhere, and I like to think that they were just the stepping stone for better more accurate technology to come foward. If load dyno's weren't the next step, then why is dynojet working on making load dyno themselfes?
Russell
Thats funny. You guys must have some super duper rear brakes for this to even remotely happen. Kinda like trying to stop your truck at 100mph with only your rear brakesonestackdram said:
, yeah its gonna throw ya 7,000lbs :-laf . It's not uncommon for dyno operators to build boost on a dynojet by way of riding the trucks brakes for a few seconds. Usually will gain some torque #'s but not much if any HP. Not too long though cause again, its like trying to stop your vehicle with only the rear brakes. The dynojet typically indicates how a truck performs on the street. If it doesn't build boost, laggy or the truck has to be run up to 90mph/3000+rpm before it builds boost on the dynojet, it usually will perform the same on the street/strip- ie no 20,000lb trailer behind it. Tommy maybe you could use some more fuel for that turbo of yours
.Bill the 'brakes' on a load dyno are eddy current twin retarders. And the reason you wouldn't shoot off of the dyno is because instead of sitting the tires on top of one huge roller, the tires sit down between two rollers giving the tires more ride on.
As far as building boost you are right, if a truck is having trouble to building boost, we simply decrease the ramp rate, i. e. put a bigger load on the truck. Like most of you who have been on a dyno that have larger turbo's i. e ps 66's, big b-1's, or custom made ones even twin chargers, you know you never get a good number because you can't light them, with a load dyno you can get them lit, like you can infront of a sled.
Russell
on a side note, Tommy, who's that good looking guy watching your guages in the video?..... LOL
As far as building boost you are right, if a truck is having trouble to building boost, we simply decrease the ramp rate, i. e. put a bigger load on the truck. Like most of you who have been on a dyno that have larger turbo's i. e ps 66's, big b-1's, or custom made ones even twin chargers, you know you never get a good number because you can't light them, with a load dyno you can get them lit, like you can infront of a sled.
Russell
on a side note, Tommy, who's that good looking guy watching your guages in the video?..... LOL
Last edited:
bgilbert said:The dynojet typically indicates how a truck performs on the street. If it doesn't build boost, laggy or the truck has to be run up to 90mph/3000+rpm before it builds boost on the dynojet, it usually will perform the same on the street/strip- ie no 20,000lb trailer behind it. Tommy maybe you could use some more fuel for that turbo of yours
I dont know, I seem to only build about 35lbs on the local DYNOjet, But on the street with no trailer I can peg like 46lbs... But then again, thats to be expected with such a large single. After using both dynos, I will use a laod-style dyno when available... . Heck, If we had more time I would have wanted to try like 2 mph/sec - And rrrrrreally load that truck down!
Anyway, I am still debateing against Nov 19th, OR DEC 10th
What say ya'll?
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Issue 128 – Digital Version
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