It didn't seem legit to me either so I did a little digging and found the real graph along with a vid of the final pull.
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- Thread starter MrSony
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Yes the graph can be in any scale the problem is that with horsepower in one scale and torque in another scale the 2 curves crossed on that graph but in actuality did not due to hp and tq being scaled differently the intersection was 235 hp and 270 lb ft of torque at 4600 rpm. In actuality hp and tq did not intersect based on now realizing they were in different scales on the y axis. No one ever said the lines have to cross in fact the only reason I brought it up is he said he stopped the pull at 5k I knew there was no way they should have crossed. And yes diesels will make that kind of power down there. It’s extremely difficult to make horsepower without rpm seeing as horsepower is torque multiplied by rpm divided by 5252 that’s why torque always exceeds horsepower below 5252 and horsepower exceeds torque above 5252. That’s also why a lot of engines are designed to have as flat of a torque curve as possible because of your torque stays at the same exact number for your power and you will increase horsepower substantially based off only the increase in rpm causing the stereotypical flat torque curve with a very high arched horsepower curve
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Are you happy with the results? Now you need to bring it up here and line up with my black car so I know if I have more or less horsepower than that.
It depends on a few variables including tire size and gear ratio (max mph speed on dyno rollers) but you normally try to get it into direct drive if not then assuming th350 second, don’t want to be in too low of a gear or you pull too quick to really load the engine and measure full torque the engine could potentially make. You stabilize your speed at the rpm you want to begin your pull 3k is common sometimes 2500, the operator will hit the button to begin recording and at that point you mash the pedal like a toggle switch until you hit your desired stop rpm let off the gas the dyno operator will engage the dyno brake and at that point you shift into neutral and allow the tires to roll to a stop without hitting the brake pedal. It can be quite an exhilarating feeling in the car, everything is 10x louder and the car just feels different strapped down like that. If you ever get a chance to make a dyno pull AND hit nitrous, life is complete it’s freaking great
Dynos have become such a joke. Everyone wants their stuff dynoed just so they can have some really high number to brag about to other people. Their true purpose is as a means to test and verify the build of an engine prior to install in car or prior to a race, to verify the effectiveness of a modification, or too verify everything is tuned and happy. For example in circle track racing especially running a big track where you’re on the gas for more than 4-5 seconds at a time especially, it is very helpful to dyno your engines, watch both your afr and exhaust temps for all cylinders. Verify what your curves look like so you aren’t turning it too far or not enough, verify your oil pressure with rpm, etc. Besides your usual timing and jet adjustments and basic things when you get into serious racing and extended time at wot exhaust gas temp becomes crucial and balance. There are a lot of classes that run GIANT 2 barrel carbs on 4 barrel intakes with adapters, and if you don’t have that carb adjusted front/rear perfectly you’ll burn pistons. I saw a guy I used to talk to lose like 5? engines in a season over that. Long story short dynos are great tools but most people just want to use them for bragging rights and that’s it
Yep, thats basically how that sh*t went down. It was dope.
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