scott r
Well-Known Member
Today was the big dyno day. I don't have a scanner that works to scan in the pictures, but the numbers that the trac is putting to the ground are pretty impressive.
278 horsepower
308 ft/lb of torque.
Now, before you go jumping to any conclusions about how that's not much power...consider that the 210 horsepower rating that a new trac has is FLYWHEEL horsepower. Not actually how much goes through the tires and onto the road. I'd be willing to bet dollars to donuts that a stock trac wouldn't get anything over 150 horses in a dyno and no more than 175 ft/lb of torque. So, as you can see the supercharger makes a pretty substantial improvement.
We also measured my a/f ratio and I am running EXTREMELY lean, so once I get in touch with wayne, so we can richen that up a bit, I should be over 300 horses to the ground and 330 ft/lb of torque. Now we're talking MORE horsepower than a late 90s or early 2000s Trans Am/Camaro by about 40-50 horsepower. For those of you who have ridden in one of those, you know that they're pretty impressive right from the factory, and they're only about 300-500 pounds lighter than our tracs.
Wayne didn't do the original tune, it was done by BamaChips, who does all the tuning for EE.
300 horses should put me right around 13.7 in the quarter mile, so I still have some work to do to get my trac down into the mid 12s, which is my ultimate goal.
For anyone who wants/needs more stats, my air/fuel ratio was 13.8-15.2, which is waaaay too high, it should be down around 11-11.5. I need to dump quite a bit more fuel into the cylinders to get more power. So the supercharger is doing its job by forcing a ton of air down there. The absolute barometric pressure of the test was 29.43 in/Hg. Temperature was 62.1F. My gear ratio was 47.85 RPM/MPH and the correction factor was 0.98 SAE.
With the supercharger, the horsepower peaked out around 3600rpm and remained steady to about 5200rpm, then it dropped off a bit and stopped at the redline of 5500 rpm. Even at 2700 rpm the truck was producing over 200 horsepower. The line goes up from about 210 hp at 2700 rpm with a nice, steady increase all the way up to 3600 rpm. Which confirms what I've been saying all along, the powerband is GREAT at highway speeds and passing a car will pin you to your seat. The torque curve follows the horsepower curve almost perfectly. The air fuel line started in the low 15s, then drops down to about 13.8 at 4400rpm, then begins to rise again, back to around 15.1 or 15.2 at 5400 rpm.
If you have any questions about this (I realize it's a bit technical, and most of it can be ignored completely), I'd be happy to answer 'em. I'm REALLY looking forward to getting the boost cooler put on, as well as a new tune. Maybe I can hit 350 hp? mwa ha ha ha!
278 horsepower
308 ft/lb of torque.
Now, before you go jumping to any conclusions about how that's not much power...consider that the 210 horsepower rating that a new trac has is FLYWHEEL horsepower. Not actually how much goes through the tires and onto the road. I'd be willing to bet dollars to donuts that a stock trac wouldn't get anything over 150 horses in a dyno and no more than 175 ft/lb of torque. So, as you can see the supercharger makes a pretty substantial improvement.
We also measured my a/f ratio and I am running EXTREMELY lean, so once I get in touch with wayne, so we can richen that up a bit, I should be over 300 horses to the ground and 330 ft/lb of torque. Now we're talking MORE horsepower than a late 90s or early 2000s Trans Am/Camaro by about 40-50 horsepower. For those of you who have ridden in one of those, you know that they're pretty impressive right from the factory, and they're only about 300-500 pounds lighter than our tracs.
Wayne didn't do the original tune, it was done by BamaChips, who does all the tuning for EE.
300 horses should put me right around 13.7 in the quarter mile, so I still have some work to do to get my trac down into the mid 12s, which is my ultimate goal.
For anyone who wants/needs more stats, my air/fuel ratio was 13.8-15.2, which is waaaay too high, it should be down around 11-11.5. I need to dump quite a bit more fuel into the cylinders to get more power. So the supercharger is doing its job by forcing a ton of air down there. The absolute barometric pressure of the test was 29.43 in/Hg. Temperature was 62.1F. My gear ratio was 47.85 RPM/MPH and the correction factor was 0.98 SAE.
With the supercharger, the horsepower peaked out around 3600rpm and remained steady to about 5200rpm, then it dropped off a bit and stopped at the redline of 5500 rpm. Even at 2700 rpm the truck was producing over 200 horsepower. The line goes up from about 210 hp at 2700 rpm with a nice, steady increase all the way up to 3600 rpm. Which confirms what I've been saying all along, the powerband is GREAT at highway speeds and passing a car will pin you to your seat. The torque curve follows the horsepower curve almost perfectly. The air fuel line started in the low 15s, then drops down to about 13.8 at 4400rpm, then begins to rise again, back to around 15.1 or 15.2 at 5400 rpm.
If you have any questions about this (I realize it's a bit technical, and most of it can be ignored completely), I'd be happy to answer 'em. I'm REALLY looking forward to getting the boost cooler put on, as well as a new tune. Maybe I can hit 350 hp? mwa ha ha ha!
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