[Vector]

My comments will be enclosed with ***

Originally posted by Unit 5302:
Ah, a Mustang Dyno owner.

Anyway, you're wrong. ***and so are you*** But that's okay. Hyping your product is cool. Dyno's were meant to do exactly what their name imply's. Measure horspower. ***yeah horsepower at the engine or horsepower at the track? hmm which do you want... tough choice there!***

The weight of a vehicle can be completely offset with gears. If you change the gear ratio in your car, your weight information becomes completely distorted. ***wtf? a vehicle weighs the same going 100mph in 4th gear as it does going 2 mph with the engine off*** There is something called a computer to adjust air/fuel ratio's if the tuner doesn't know what he's doing. Tune it on the ragged edge, you get what you asked for. As far as putting your Mustang Dyno up against a Dynojet car, both with 400hp measured, yeah, you're car is going to win. Know why? ***um because the car tuned on the MustangDyno is tuned for more usable on-track horsepower than your car which is tuned for the most horsepower it can just fling out there as fast as it can*** Cause your dyno is wrong. ***no you are*** Take your car with 400hp (setup with your BS parameters) then send the guy to a Dynojet and voila, he's got more. 420, whatever. ***he's got more real, usable hp*** Why is it that so many people who tune their vehicles on a Dynojet experiance no problems with their cars? ***who, what people? I want names*** Cause you are floating hype. ***and you are floating BS*** If a tuner knows what he's doing, your car will be setup right. ***so you don't think that turbolx knows what he's doing? How can you know that anyone knows what they are doing?*** As far as tuning, since the car isn't run in the same gear for tune purposes, the engine is placed under different load conditions (called gears). A 3rd gear run won't put as much load on an engine as a 4th gear run. It's called torque multiplication. If a car is properly tuned, the 3rd gear pull, and the 4th gear pull should appear almost exactly the same. Making up some make believe weight number (cause you really don't know, and the load on the engine is changed by gearing) for a car won't help you tune it. ***the load on the engine is changed by gearing, the load on the WHEELS isn't!!!! wow is that a new concept for you? I wonder! The MustangDyno simulates VEHICLE weight, your VEHICLE weight does not CHANGE depending on gearing or it would be MAGIC. The engine, regardless of gearing, fights against the same weight inflicted on the wheels all throughout any speed range you could think of (without going into the realm of relativity here). So why would putting resistance on the rear wheels to simulate vehicle weight be innacurate because of the engine gearing? Think about this a little more... come on now, it's not tough.***

Furthermore, a coefficient of drag is NOT a constant number at all velocities. Take a look at the Ferrari Testarossa. It has a god awful Cd of drag, at measured wind tunnel speeds. But, dispite that fact, it manages a very high top speed. That's because airflow changes and creates pressure zones where air builds up forming a barrier around the object. Take a look at your rear window and watch the changing patterns as your speed increases and decreases on a rainy/snowy day. That correlates to a direct change in drag coefficient. ***we are not talking about increases and decreases in speed in rainy snowy weather. We are talking about a very predictable acceleration curve over a 1/4 mile distance which we deffinately can calculate the drag factor.***

All your engineering is partially right. Under 1 set of circumstances. Applying them to the real world is another thing altogether. ***ironicaly enough, that's exactly what the Dynojet doesn't do***

Flame me all you want, I find it fun to shoot you down Unit as you seem to like doing it to me.

[This message has been edited by Vector (edited 08-18-2001).]