First dyno run - looking for opinions

[Voice of Reason]

Below is a pic from my first dyno last weekend. Power is a little lower than I was expecting so I'm looking for opinions. See full mod list in my sig.

There was another G8 there that dyno'd and I made about 11 hp peak more, but our tq peak was identical. I only have a youtube video of his run to go on right now (I'm hoping he can send me his dyno file) but below 4750 rpm our tq curves look nearly identical. Above that the 1.85s show their stuff and carry the power longer. But this goes against my butt dyno. Around town at part throttle I've noticed a marked improvement in power with the 1.85s.

Differences are:

- I have 1 3/4 Kooks vs his 1 7/8 Kooks
- I have SLP Powerflo axle back vs his Kooks axle back
- I have 1.85 Yella Terras vs his stock rockers
- I have a Livernois tune vs his non-Livernois tune (not sure who did it, though I know they aren't a vendor)

In the end I had thought I was making about this much power before the Yella Terras, so getting these numbers after is a little disappointing.

So in the end, knowing this is just a tuning tool, what does everyone think about the A/F ratio? It goes a little rich at the end and I think that may be costing me some Hp. I can email anyone who wants it my dyno run so they can view it in WinPEP.

[Voice of Reason]

One note on the graph. These numbers are SAE. I guess if I want to make myself feel better I can switch the chart to STD. Doing that my peak hp is 369.58 and tq is 376.64. LOL. That's why I'm not focusing as much on the peak numbers, but more interested in what people think about the A/F ratio. What is the ideal ratio for our engines?

[desertg8]

I hear around 12.5 for a na l76. I only made 368 rwhp and at sea level I am in the high 11s. So I would not just focus on horsepower alone.

[Devilish34]

Looks fat....Send pic of graph to livernois so they can see and adjust...

[desertg8]

yes, it does seem like it is running rich. there is another five plus ponies waiting to run for you.

[GT Drew]

Was there any knock detected? What octane gas being used? What is the max WOT timing? You seem to have a reasonable increase for rockers, untuned. Would be interesting to see if it will stand anymore timing and leaned just a tad on the top end. When you look at the specs the rockers give you just a about the LS1 cam specs.
.015 more lift but 2 deg less timing. as for F/A ratios, opinions will vary between 12.2 and 12.5. All depends on how knock resistant you particular engine is.

[Voice of Reason]

I wasn't smart enough to data log during the dyno run, but I did take the car out last night and do some logs for the very first time. To answer Drew's questions:

- There is never any meaningful knock retard. At most watching the run it would get 0.181, but it wasn't consistent.
- 93 octane
- max WOT spark advance is 26 at 6000 rpm. Below that it went from 24.5-25.5 from about 4k-6k.

I'm going to be sending everything to Livernois to see if they recommend making any adjustments. I'm planning on going to the track next weekend, so I'll take the laptop with me so I can switch back and forth between the current tune and new one from them to see if power increased.

I really appreciate the responses. When the thread went a week without any I was worried. Ha.

[desertg8]

under 4000 rpm what is the timing? i heard that is where it should be the highest since there is less g/cyl and the engine is less efficient there.

My guess would be around 27. Is this a 93 tune from Livernois?

[Voice of Reason]

Under 4k I see anywhere from 22.5 to 25. Highest I see is 26 @ 6k rpm. So adding some timing and leaning out the top end is what it sounds like it needs.

[desertg8]

hmmm. interesting. i am not a tuner. but i thought most tuners are adding timing on na aspirated cars from 0-4600 rpm. usually from 200 rpm before and after the peak torque the timing is adjusted to be a little lower. i.e. mine makes the most torque at 4800 rpm. So when I get a hold of hp tuners again I will have my timing from 0-4600 at 26. from 4600-5200 around 23-24 and from 5200 up around 25. There are others on here who can tell you their exact timing mods for a na g8 with bolt ons such as yours. also your area has good gasoline which is a plus.