Since it comes from "back in the day" before chassis dyno's were available, it comes from guys who did their tuning on engine dyno's.

Keith

 

I can't believe that people think it is a linear scale... 1MPH with every 10 HP is a variable.
The scale is also variable. You can't just keep adding on 1+1+1+1.
It isn't linear in the least. That is an average calculation.
A mustang dyno or any load based dynamometer will give you an overall Wheel HP figure. I think that people are forgetting this.
Every "peak" number is just that and they all rely on calculations to do so. The difference is that the MD is using actual "road load" to do it.
The numbers aren't low in my proffesional opinion. They are actual.
Its time for everyone to stop focusing on peak numbers and focus on trap speeds.
My two cents.

 

David, On our Dynojet you can also do static loading with the right options from the factory. I have used that feature to detect an engine stumble complaint at a predetermined speed on the highway.

See Ya on Friday afternoon

Jim

 

Amen, dynos mean dick except to tune a car. Trap speeds are where it's at. That is real world useable power and that is all that matters in the end.

 

Here is what a trace view graph looks like from a MD dyno, I think the smoothing was pretty high on this one, and yes David, you can print them out.



And congrats on the new dyno David, I'm suprised you just now got a mustang, after all these years.

 

The one thing that bugs me about the trace graphs of the MD printouts is that the tq curve is scaled up so that the peak tq value matches the peak hp value, even when that's not the case.

 

No that is not the case. When the graph is set up properly it will overlay HP and Torque crossing at the same point every time. That point will be at 5252rpm. That gives you an indication that you are looking at the proper load and rpm points. Most dynojet printouts I have seen never set there graph up like that.
So the peaks you are looking at will be actual numbers to compare with HP

 

Trace graph viewer is by far the most detailed printout. That is why it is called a trace. You will find that in most cases the trace graph will be the only one you will look to for info. Every analogue input can be shown here with proper scaling to pinpoint your tuning efficiency.
Dave there is a very easy way to set up a good looking graph and easy on the eyes. This weekend if you like I can go over some with you that will help speed up your process.

 

gsujeff,

Actually my point was NOT relying on the Dynojets numbers alone, any slide rule calculator or drag race program you run weight and MPH through matches up to what the Dynojet says better than any other dyno I have seen. To answer you rude comment to early EVO, what difference does it really make? These slide rules and such have been out before Dynojets, so I would assume not from running on a dyno jet. If anything it would be an engine dyno or one of the even older chassis dyno's. My guess is a 10 hp gain on a Dynojet is the same as a 10 hp gain on a MD, it is a GAIN, not a total number. In other words if the dyno started at 200 (MD) and you add a catback I would think if it gains 10 whp then on a Dynojet you might start at 240 and still gain 10.

Just my guess.

David Buschur
www.buschurracing.com

 

Yep, my guess is that trace graph has the smoothing set pretty darn high

Thanks for the offer on setting up the graphs and such. The actual installer/trainer from MD is going to be here this weekend. Coming to hang out, wants to give me a hand if we need it, I should be O.K. If not I will take you up on it. Be sure to stop and introduce yourselves! My memory for names is VERY short, I'll warn you.

David Buschur
www.buschurracing.com

 

Nope, you aren't gonna see the same gain on a dynojet with the addition of new parts as you will on a MD or DD. Try it out sometime...make a pass on both at 20psi....then crank it to 28psi. You will gain more power on the dynojet.

My rude comment to him was based on a rude comment to me. Not a big deal. I do not think dynojets are accurate, thats is my educated opinion. I also, do not think gaining 1mph for 10 hp is accurate. Nor do i think every 100lbs you drop you gain 1mph. Its all estimates based on estimates. There is not enough consistancy in any 1/4 mile pass to prove any of it.

But, wow, are we off topic. Take care of that new dyno, and don't bother inflating numbers. I just wish i lived somewhere within a 50 mile radius of ANY awd dyno.

 

I agree 100% with this, if a dynojet dyno is reading 10% higher than a mustang dyno on a stock car, then if you do mods that gain 100 HP on the dynojet, you will only see a 90 HP gain on the Mustang dyno. These are just examples, not sure what the percentage difference is in their readings.

Keith

 

Damn it.

I was on the phone with MD yesterday and found that the numbers that we were changing around to see what would happen with the dyno were never saved. I found this by accident actually when I dyno'd a couple of other cars and corrected it.

I was very curious this morning about the numbers we got from my brothers car. As I suspected that when the installer from MD was here and we were changing numbers that when we pulled Dan's EVO they defaulted back to what they were set at the factory.

Well I was right. The dyno is now EXACTLY the way it was delivered and set up. Every single parameter is also EXACTLY the way MD wants it.

Very disapointing, the car made 538 whp and 465 torque. That's a long way from 640 whp.

My brother said, "Just tell me the numbers, I don't care what the dyno says, this is the fastest and cleanest the car has ever run."

I have one car to tune today, one to run for a comparison to my competitors dyno and then I am going to put my RS back on and see where it is.

538 whp isn't much of a number for a stroked EVO, race gas and a GT35R. This car has trapped over 134 mph at complete full weight. The front steel bumper support is not in the car and the car has a 16 gallon fuel cell that is full most of the time as Dan drives it almost everyday to and from work.

I can't wait to get the AWD car on today that was recently on an AWD Dynojet. Then we will know.

Hope you all enjoy reading the trials and such I seem to put everything we do through.

Thanks guys,

David Buschur
www.buschurracing.com

 

dang dave, you are number hungry aren't you?

who cares what the number says....the car traps 134mph.

 

Well in my case (the trace graph I posted above), the peak tq and hp are pretty much the same. 264whp/261wtq.