Solstice Dyno Test - Page 3

JT72 · 12-12-2005, 02:54 AM

Yeah, Sorry about that. I'm not too computer literate to flip image.

brentil · 12-12-2005, 01:54 PM

Quote:

Originally Posted by JT72

Yeah, Sorry about that. I'm not too computer literate to flip image.

It's all good. All that matters is you got dyno graphs to show us.

Ex-Miata Man · 12-12-2005, 07:08 PM

I've never seen a dyno graph before. Can someone give a quick lesson on how to read them and what they are showing? Thanks!

salstice · 12-12-2005, 10:15 PM

Sure, I can try and explain what you're looking at. Usually the dyno graphs show rpm's (rotations/revolution per minute) along the bottom axis (x-axis). Along the vertical axis (y-axis), either torque (ft-lbs) or horsepower will be shown. Now the line that is plotted represents a specific horsepower or torque values at corresponding rpm's. This plot is very helpful because one can see where there are power losses and gains. One can then tune to add power where it is desired. Hope this helps.

Ex-Miata Man · 12-13-2005, 05:59 AM

salstice,
Thanks for the explaination. I've read about the dyno tests on the Forum but didn't know how they worked. Thanks again.
XMM

todd_raleigh · 12-13-2005, 10:02 AM

sorry for the stupid question, but how do you get two values for the same horsepower/torque? is it due to different gears? how do you read the shift from gear to gear? there are different colored lines? what are they? I didn't see a legend on the graphs to explain it. thanks. todd

toddwcarpenter · 12-13-2005, 11:51 AM

Quote:

Originally Posted by todd_raleigh

sorry for the stupid question, but how do you get two values for the same horsepower/torque? is it due to different gears? how do you read the shift from gear to gear? there are different colored lines? what are they? I didn't see a legend on the graphs to explain it. thanks. todd

I'm not exactly sure what you mean by multiple values. I think you are asking about the different runs on the dyno. Each colored line represents these different runs. Many dyno shops run your car three times for a flat fee. This allows you to be sure that any one dyno is not an anomoly. Runs are usually only done in one gear, 4th usually.

Thraxz · 12-13-2005, 12:49 PM

Engines make different horsepower and torque at different RPM, period. If you have a 170 hp engine... that's the engine's PEAK horsepower at whatever RPM is peaks at. No matter what gear you are in, your engine makes the same hp/torque except it's multiplied by the gear ratio and your tires experience it at the multiplied number. The different colored lines on those sheets denote either torque, hp or air fuel ratio. As for the three runs, your engine isn't perfect, it'll put out very slightly different numbers from one run to the next simply because of random events... like spark plugs arcing a slightly different direction causing better or worse burns.

SRT4Geezer · 12-13-2005, 03:57 PM

What's the deal with the dips at 2400 & 3400 rpm's??? That would scare me. Almost looks like clutch slip. Pretty dramatic on the torque graph. Maybe wheel slip. I have never seen a dyno on this type of dyno. Where is the A/F you are talking about?

werks · 12-22-2005, 10:02 PM

Probably should datalog a run as well with some sort of scanner. Logging timing, IAT, etc.. We will be doing one next week and I will post some results.

Dave

mlegere · 12-22-2005, 10:17 PM

Quote:

Originally Posted by JT72

Hey fellow Sol'legues, I decided to go get my Solstice Dynoed just morning and want to share my results. Not stated but, I'm getting a lil over 190 at the fly wheel. Tech says i'm running a lil rich but if i can get someone to adjust my mixture using my ECU I should get around 200hp on the F/W & maybe around 173 at the R/W. Anyway i'm happy with the Sol's performance. He said with a Turbo at 10 psi i should be around 300hp. (Subaru WRX STi killer

I really don't know what most of these colorful lines mean but i'm sure most of you do. Oh, don't forget i am equiped with GMPP Intake & Cat back. Feel free to comment. Oh yeah, Miata MX-what!

IN LUV with #1928

Nice wheels, who makes those, and uh how much?

JT72 · 12-28-2005, 07:19 PM

Quote:

Originally Posted by werks

Probably should datalog a run as well with some sort of scanner. Logging timing, IAT, etc.. We will be doing one next week and I will post some results.

Dave

I have no idea what you are talking about, i have problem reading my own Dyno. What's Loggin timing, IAT, and how was the results.

Dogtown · 01-10-2006, 09:41 PM

Here is my first baseline dyno.

brentil · 01-11-2006, 02:36 PM

I was having issues with the image no loading for me so I attached it to your post as well.

Seeing that 3200 RPM torque drop over and over again just baffles me all the time. Is GM doing something the the ECU or something to hinder the engine at that point or something?

SolsticeWolf · 01-11-2006, 04:14 PM

Quote:

Originally Posted by brentil

I was having issues with the image no loading for me so I attached it to your post as well.

Seeing that 3200 RPM torque drop over and over again just baffles me all the time. Is GM doing something the the ECU or something to hinder the engine at that point or something?

Tell me about it, brentil. I refer you back to mine:

The dip in torque co-incides with a drastic drop in the A/F ratio. How odd is that? Any body care to enlighten me?