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

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.

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Here is my first baseline dyno.

Attached Thumbnails

 

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-DT
#197
V-8

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?

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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?

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Honda Associate, Solstice Owner
2006 Mysterious Steel/Sand
Personal tag: PURNRG = PURe eNeRGy!!!!

All I can think of is some sort of VVT issue or GM did this on purpose in the computer. This RPM range is around where you would be cruising at high speeds in 5th gear. Maybe it's to increase fuel economy at highway speeds?

If you look at all the graphs for CAI, headers, exhausts though every single one of them sees a massive increase at this RPM though. Much larger then anywhere else on the graph pretty much.

I really wish someone with more knowledge on this type of stuff would add to this.

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When we ran Dogtown's car we had our scanner plugged in and noticed timing was pulled back where the torque drops, but not all that much. It should not have caused that big of a dip in torque.

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Midwest Solstice/Sky Headquarters!
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Where did you get them?
I sold my Miata when I bought the Solstice,
thanks
scottfishy@aol.com

Looking at JT72's dyno graph, it seems as though the car could benefit from an AFC to lean it out a bit up top.

Dynoflow
70 dregree day
end of tailpipe Air/fuel reading

all three pulls

Best pull

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JT72 thanks for posting this.

I was going to ask if anyone dyno'd their stock (right off of the show room) solstice and what their RWHP was.

Much of what I have seen and read on almost all cars is based on an approximate 15% drive train loss, depending on whether the car is an auto or manual. W/manuals usually having less of a loss, not sure why. Either way it seems like a good average to use. Also, someone would probably see an increase in RWHP w/a few more miles on your car (once it's "broken-in"). It seems that 139sh to 145sh RWHP would be an expectable range for a stock solstice.

WE use 143WHP as been the standard when talking about the stock Solstice.

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Link to another dyno graph;
My dyno report

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Please let me inject some different thoughts on the dyno, which comes from over two hundred pulls on a dynojet:

1. Many operators will charge extra for connecting the a/f, therefore, many people don't log the a/f. That is a mistake, the reason for the dyno pull is to tune and you cannot do such without a/f. I am sure that someome will shortly have a piggyback ecm adder to adjust the a/f.

2. If the operator of the Dynojet brand uses the factory a/f set-up, it is notorius for showing lean. It could be one point plus at the low end and close to one point at the high end. To be as accurate as possible you have to tell them to remove all smoothing. Secondly, it becomes more accurate if you have them start their log as you go WOT.

3. The a/f will have further inaccuracies due to the use of a tail pipe sniffer, These devices are inherently inaccurate, plus, you are below the cats. If you are serious about tuning you have to install an in-car wide band O2 set-up. YOU DO NOT MAKE CHANGES TO A HIGH BOOST CAR WITHOUT LOGGING A/F.

4. There are different correction factors for the ambient conditions, the most accepted is the SAE set of corrections. If the operator uses the STD factors it will show higher hp.

5. At a minimum have them print every pull in the graphical form, plus, have them print it in the tabular form. The best is to have them also give you the file. Dynojet typically allows you to download the graphing program, therefore, you can plot it to your liking off of your computer.

6. There was a comment on timing from a scan tool, be careful, scan tools are too slow to log at wot. I log timing off of an Innovate A/F logging system and it is quite different than the scanner data. On the other hand the
scanner does a fine job if the slope of the rpm curve is mostly horizontal.

7. Lastly, if anyone wants to gather data for tuning purposes the Innovate series of products is a low cost system that outputs data similar to systems that cost thousands. When I get my car (about two weeks) I will install a sytem.

You can actually road tune quite effectively with this method. On my current car I log:

rpm
a/f
fuel pressure
ignition advance
hp and torque
throttle position
intake air temp

I am adding:
coolant temp
(2) exhaust gas temp
injector pulse
(1) more a/f channel

What is interesting, most of the above are picked up right off of the oem ecm.