[Vettezuki]

Originally Posted by injdinjn

How did they determine RWHP with just the motor?
Is that called a scientific guestimation, like global warming?

There are a myriad of variables between the flywheel and the where the rubber meets the road and every car is different.

Not that different. Drivetrain losses for given vehicle combos are pretty well known and the variances might be 1-2%, IOW, <= 10 HP . . . max.

[BADDASSC6]

Originally Posted by injdinjn

How did they determine RWHP with just the motor?
Is that called a scientific guestimation, like global warming?

There are a myriad of variables between the flywheel and the where the rubber meets the road and every car is different.

I don't know why you think they just had the motor. They had the hole car. No global warming here.

[Shaolin Crane]

Originally Posted by Vettezuki

That's what I thought. The spread is not *that* big. 530 vs. 450 is pretty major. Maybe a combo of difference between Mustand and Dynojet and shit hot day vs. a nice cool day? Even that seems a little much.

I know i've seen 60-70hp splits between mustang and dyno jets on the corral and other mustang boards. On the flip side it's the opposite with diesels, the mustang dyno will show more torque then a dyno jet just from the nature of a diesel.

DA, elevation, temp, etc all plays a role in determining what a car will make on a given day. Find one dyno and stick with it it's strictly a tuning device and the most accurate measurement is taking it to the track. Unfortunately, AAA is still closed so irwindale is your only option. Both have their issues, AAA is a notoriously slow track and irwindale is a notoriously fast track. I've NEVER been able to replicate a run I made at irwindale at AAA.

[BADDASSC6]

Is Irwindale is 1/8th mile only. I don't care about time really just trap speed. That's the best indication of power.

[Shaolin Crane]

Yes, 1/8 mile. They're in the works to convert it to 1/4 though

[Vettezuki]

Originally Posted by Shaolin Crane

I know i've seen 60-70hp splits between mustang and dyno jets on the corral and other mustang boards. On the flip side it's the opposite with diesels, the mustang dyno will show more torque then a dyno jet just from the nature of a diesel.

DA, elevation, temp, etc all plays a role in determining what a car will make on a given day. Find one dyno and stick with it it's strictly a tuning device and the most accurate measurement is taking it to the track. Unfortunately, AAA is still closed so irwindale is your only option. Both have their issues, AAA is a notoriously slow track and irwindale is a notoriously fast track. I've NEVER been able to replicate a run I made at irwindale at AAA.

There's also just jack asses who don't calibrate their equipment. But see the data table above, the spread is not so big and has been my personal experience going between two reputable shops. Don't modern dynos software adjust for elevation at least to bring everything to sea level. Thought I remember that. But yes an engine can vary a lot but, honest 530 to 450 is a shit ton of difference, to the point I suspect either a) the engine ain't making that much power or b) one of the dynos is not calibrated correctly. Of course it could be a "run" of all those factors adding up to a big difference. Anyway, what's most important is that it does what he wants in the context he needs it to work. At the end of the day, it's all about ETs.

Group hug?

[Shaolin Crane]

Originally Posted by Vettezuki

There's also just jack asses who don't calibrate their equipment. But see the data table above, the spread is not so big and has been my personal experience going between two reputable shops. Don't modern dynos software adjust for elevation at least to bring everything to sea level. Thought I remember that. But yes an engine can vary a lot but, honest 530 to 450 is a shit ton of difference, to the point I suspect either a) the engine ain't making that much power or b) one of the dynos is not calibrated correctly. Of course it could be a "run" of all those factors adding up to a big difference. Anyway, what's most important is that it does what he wants in the context he needs it to work. At the end of the day, it's all about ETs.

Group hug?

I'm only going by the reputable dyno runs from well known tuners. The problem is most of them are spread across the country. Different geographical location play a big part.

When properly set up a mustang dyno needs to be loaded to the vehicle that its placed on, so different cars will have different splits. I'm not saying it is or isn't probable. Just what i've seen

[BADDASSC6]

So it still really bothers me that the car is down on power. I am going to check the new th to make sure its coming full open. That is a possibility. It electronic and I just bolted it up. I hope that's the case and I hope they don't hit me for another $800 if it is and I have to refine.

[Vettezuki]

Originally Posted by BADDASSC6

So it still really bothers me that the car is down on power. I am going to check the new th to make sure its coming full open. That is a possibility. It electronic and I just bolted it up. I hope that's the case and I hope they don't hit me for another $800 if it is and I have to refine.

That's a possibility but I'd be surprised. If the throttle was a new unit and you just plugged into the harness it should just be responding to the the computer.

Now, yours is a full fly by wire setup right? Maybe there's something in the tune that's preventing the computer from commanding the throttle to open up 100%. Just guessing here.

[Damian]

My only advice is to pick one dyno and stick with it. There are too many variables between two different dynos. With my Eclipse, I had 3 completely different numbers on all 3 dynos. I even had a bone stock Eclipse put down higher numbers than me but I smoked the shit out of him at Fontana every time we ran against each other. One run I even gave him a head start.