Can someone explain Gintani dyno's

EagleEye CA · 03-02-2010, 05:22 PM

I am confused now looking at dyno's done at Gintani. Why are the axis point where tq meets hp differ from run to run? Why are they not intersecting at 5252 rpm? If they have dyno'd many different M3s why can't they have a consistent scale to use all the time?

Original post

Original Post

Bone stock run, notice how its at 5252

Rpi Scoops, Fully catless Stock exhaust, Powerchip Stage 1, RD Sport Pulley

Rpi Scoops, Macht Schnell Air Filter, No cat stock X-pipe, RD SPort Pulley ,Gintani Rear section.

Original Post

Stock run Axis point is at approx 5700

After envy intake, note that after they leaned it out the axis point is shifting back from 6100 to 5800

Original post

Finally this one, notice this was on the same exact day but couple hours apart yet the axis point is way off.

powertrip · 03-02-2010, 05:35 PM

Why don't you just call and ask Gintani

?

masitr · 03-02-2010, 06:03 PM

Its due to the HP And TQ Scale being different. That will move the RPM cross point. The unexpainable ones are the graphs that have the same scale and different cross points. It is either photoshop or something in the dyno dynamics software. I have never seen anything like that.

skoot3r · 03-02-2010, 06:19 PM

Quote:

Originally Posted by powertrip

Why don't you just call and ask Gintani

?

+1
I really don't see the point of this thread unless you are trying to be a troll and start a bashing thread. Really you should either PM them or give them a call before posting next time.

EagleEye CA · 03-02-2010, 06:19 PM

Quote:

Originally Posted by PencilGeek

I can tell you exactly why this happens and and assure you this is totally normal. You are correct that HP and TQ should always intersect at 5252 RPMs. But notice that in each of these graphs HP and TQ are on separate scales. For example in the first graph, HP is on a 0-400 scale, but TQ is on a 0-450 scale. If you put them both HP and TQ on the same exact scale then they would perfectly intersect at 5252. But because HP and TQ are on different scales, that means you can't even think of the two lines intersecting -- because it's like two different graphs being overlayed onto the same screen.

For example, if TQ scaled from 0-5000, then the TQ curve would be crunched at the bottom of the screen and wouldn't even intersect HP at all. This isn't unique to the Gintani dyno results -- this would be true of any dyno that puts HP and TQ on separate scales. Dynojet does the same thing, as does Dynapack. To avoid this confusion, when I print my own dyno graphs, I makes sure that HP and TQ have the same scale, then the lines intersect on the screen exactly where you expect to see them.

I hope this helps explain the confusion.

Thanks for clarifying all this. Why wouldn't you use the same scale everytime? Any advantage to scaling differently?

EagleEye CA · 03-02-2010, 06:40 PM

Quote:

Originally Posted by PencilGeek

Dyno software does it automatically so you can actually see some shape in the TQ curve. If it didn't auto scale, then sometimes the TQ curve would have no visual shape to it and you'd never be able to tell where your peak was.

It's a real pain-in-the-butt for a dyno operator to change it. They may need to override the system defaults every time they do a dyno run. That's not practical for a shop trying to make a profit. I do it on my own graphs, just because I'm not a shop and I have too much time on my hands.

When I first saw this more than a year ago with my own dyno results, it confused me too. That's when I noticed that the two numbers were on different scales. As soon as I corrected the scales, the lines intersected exactly where I expected.

it all makes sense now, thank you.

Mr.Bimmer · 03-02-2010, 07:09 PM

This was one of the more informative posts I've seen on this board in a while. Thank you to EagleEye and PG for sharing this information.

masitr · 03-02-2010, 09:15 PM

It is not just as simple as the scaling. Why do curves laid over each other on the same graph with the same scale have 2 different intersection points.

Look at this one the blue run crosses @ 5800 and the red @ 6000. How can this be if both runs are in the same scale?

Can you scale scale two runs on the same graph differently? Is this a Dyno dynamics thing?

03-02-2010, 05:22 PM	#1
EagleEye CA Supreme Chancellor 0 Rep 81 Posts Drives: E92 M3 Join Date: Aug 2009 Location: Canada iTrader: (0)	Can someone explain Gintani dyno's I am confused now looking at dyno's done at Gintani. Why are the axis point where tq meets hp differ from run to run? Why are they not intersecting at 5252 rpm? If they have dyno'd many different M3s why can't they have a consistent scale to use all the time? Original post Original Post Bone stock run, notice how its at 5252 Rpi Scoops, Fully catless Stock exhaust, Powerchip Stage 1, RD Sport Pulley Rpi Scoops, Macht Schnell Air Filter, No cat stock X-pipe, RD SPort Pulley ,Gintani Rear section. Original Post Stock run Axis point is at approx 5700 After envy intake, note that after they leaned it out the axis point is shifting back from 6100 to 5800 Original post Finally this one, notice this was on the same exact day but couple hours apart yet the axis point is way off.
	Appreciate 0 Tweet Quote

03-02-2010, 05:35 PM	#2
powertrip Scared money don't make money. 67 Rep 1,448 Posts Drives: 2009 E92 M3 DCT Join Date: Apr 2009 Location: Irvine, CA iTrader: (3) Garage List 2009 E92 M3 [0.00]	Why don't you just call and ask Gintani ? __________________ 2009 E92 M3/DCT/Alpine White/Fox Red/Carbon Leather OE Tuned 402 whp & 303 wtq/Gintani X-pipe/MXP Axle Back/Rogue Pulley/AFE Stage 2/Cosmetics By IND & EAS HUGE THANKS: Gintani, OE Tuning, and EAS
	Appreciate 0 Quote

03-02-2010, 06:03 PM	#3
masitr Private First Class 23 Rep 148 Posts Drives: E92 M3 6MT Join Date: Jan 2009 Location: NW Ohio iTrader: (6)	Its due to the HP And TQ Scale being different. That will move the RPM cross point. The unexpainable ones are the graphs that have the same scale and different cross points. It is either photoshop or something in the dyno dynamics software. I have never seen anything like that.
	Appreciate 0 Quote

03-02-2010, 07:09 PM	#7
Mr.Bimmer Lieutenant 44 Rep 436 Posts Drives: 2010 E90 M3 (sold) Join Date: May 2006 Location: Orange County, Ca iTrader: (5)	This was one of the more informative posts I've seen on this board in a while. Thank you to EagleEye and PG for sharing this information.
	Appreciate 0 Quote

03-02-2010, 09:15 PM	#8
masitr Private First Class 23 Rep 148 Posts Drives: E92 M3 6MT Join Date: Jan 2009 Location: NW Ohio iTrader: (6)	It is not just as simple as the scaling. Why do curves laid over each other on the same graph with the same scale have 2 different intersection points. Look at this one the blue run crosses @ 5800 and the red @ 6000. How can this be if both runs are in the same scale? Can you scale scale two runs on the same graph differently? Is this a Dyno dynamics thing? Attached Images Last edited by masitr; 03-02-2010 at 09:21 PM..
	Appreciate 0 Quote