Help Me Analyze My Dyno Graph

[CTOESHO]

Just took my 210K mile 3.0 SHO to the dyno. I pulled a best of 195.9FWHP and 188.1TQ. The pull was made in 4th Gear. My mods are SHOshop Stage I minus UDPs (waiting from SHOshop) but my LPM thinks I have UDPs (bought off another SHO owner and didn't bother to have it reburned to not have UDPs. Is this a prob?) Anyways, I will have the graph scanned tomorrow but in the meantime, I will list the data and was wondering if this was normal. My power also died off after 6000 rpms. Does this sound a little low to you guys? Looks like I'll be shifting a lot sooner now. The dyno guy also told me that I was running "dangerously" lean. You be the judge and see if I am or not. Also, when my SHO was at higher RPMs, it was sputtering grey/black smoke. It wasn't a consist cloud of smoke, but a sputtering (on/off/on/off) of smoke.

RPM HP TQ A/F
1900 55.7 159.6 15.5
2000 61.4 161.3 15.2
2100 65.9 164.8 14.5
2200 70.0 167.1 15.0
2300 74.4 170.0 14.9
2400 78.8 172.5 14.7
2500 84.4 177.3 14.7
2600 89.4 180.5 14.8
2700 94.5 183.7 14.9
2800 98.8 185.4 14.8
2900 102.6 185.8 14.7
3000 104.9 183.7 14.6
3100 109.0 184.7 14.5
3200 111.1 182.4 14.7
3300 112.3 178.8 14.4
3400 114.9 177.5 14.2
3500 116.8 175.3 14.2
3600 119.2 173.9 14.3
3700 122.4 173.8 14.5
3800 125.9 174.0 14.7
3900 131.3 176.9 14.4
4000 136.7 179.5 14.1
4100 142.5 182.6 14.1
4200 148.0 185.1 13.9
4300 152.7 186.5 13.9
4400 157.1 187.5 14.0
4500 160.8 187.7 14.0
4600 163.9 187.1 13.9
4700 167.8 187.6 14.0
4800 171.6 187.8 14.0
4900 174.8 187.4 13.9
5000 177.8 186.7 14.0
5100 180.2 185.6 14.1
5200 183.3 185.1 14.2
5300 185.5 183.8 14.3
5400 187.8 182.6 14.4
5500 190.6 182.0 14.4
5600 192.2 180.3 14.3
5700 193.4 178.2 14.3
5800 194.5 176.1 14.4
5900 195.4 173.9 14.3
6000 195.1 170.7 14.3
6100 193.2 166.4 14.2
6200 191.0 161.8 14.2
6300 191.5 159.7 14.3
6400 189.8 155.7 14.2
6500 186.7 150.9 14.1
6600 183.1 145.7 14.0
6700 182.5 143.0 14.0
6800 181.2 139.9 13.9

Column Max
195.4 187.8 15.5
Column Min
55.6 139.9 13.9
Column AVG
142.2 174.7 14.4

Absolute Barometric Pressure: 29.14in.Hg.
Vapor Pressure: 0.31in.Hg.
Intake Air Temperature: 85.6 F
Gear Ratio: 52.25 RPM/MPH
Correction Factor: 1.03 SAE

I would like to thank people in advance for any help they can tell me to help tune the LPM. Ted, I will be contacting your shortly. Thanks again

 

[sdpatt]

Those numbers look quite healthy except for the lean A/F data. That lean mixture could be from the LPM, the MAF or the combination. You may want to check the dyno topic in the Open Forum - SHO Related header. You had very little fall off after the power peak at 5,900 and should adjust your shift points to keep the revs centered around that peak. That requires shifting near redline.

 

[yamahaSHO]

Actually 14:1 A/F is not bad, if previous teachings working on 305's and 350's, 14:1 was optimal.

 

[shotimev6]

at WOT you want 12.5:1-13:1. 14.7:1 is ideal at cruising and whatnot but under wot you want it to go rich a little bit.

 

[Yamaha V6]

Yeah Mike, that's kinda lean. Not as bad as I've seen it, but still lean.

For 210k, 195hp at the wheels isn't bad. I got the same numbers from my 130k 91 during the MAF / Y-Pipe combo testing last year. Tq looks good across the board at your tq. peaks before & after the secondaries.

I want to see the graph to see any "jitters" up high.

4th gear is the best gear to run in, as there's less "correction" by the dyno for the gearing.

 

[sdpatt]

With the smoothing of the discreet data points, the curves look quite normal and greater than the original 220 hp output (181 hp at the wheels). The air/fuel ratio is on the lean side for full throttle mapping. See the revised Excel generated graphs below.

<small>[ June 11, 2003, 08:44 AM: Message edited by: sdpatt ]</small>

 

[CTOESHO]

Scott,
Thank you so much for inputting my data and creating a graph. You really went out of your way to help and I greatly appreciate it.

<small>[ June 10, 2003, 08:35 PM: Message edited by: CTOESHO ]</small>

 

[AutoSHO]

Those numbers are much leaner than a typical SHO.

Also, if you were seeing black/grey smoke, and running that lean, you've got a problem with incomplete combustion. How long since you last changed your plugs?

 

[jthomas68]

I don`t think most people here understand the reasoning and purpose of an LPM.Cars are dyno tuned to get the best results with the most safety.It essensially means the engine is "tuned on the dyno".An LPM that is not specifically tuned for your car with a before dyno sheet is not what it`s intended for.It`s not a "bolt on" mod,it`s used(or supposed to be used) for fine tuning on the computer for the engine.Many people are hurting from a poorly tuned LPM,not because Ted did a bad job,but because they didn`t go the extra mile to get the car tuned properly.What spend the money for an LPM,only to get the "best shot" at how the car should be tuned?
Yank that LPM out before it causes damage,especially with the high miles.Ted can get a much better one for you with the dyno sheet that you now have.
Btw,this isn`t intended towards you,just LPM buyers in general.

 

[yamahaSHO]

When I build up my new motor, I am going to have the car dyno-tuned. I am not even gonna put on the Ford 80mm MAF until then either.

 

[sdpatt]

I have plotted the A/F ratio and displayed the graph above. You may save these graphs to your own computer by right clicking and selecting "Save Picture As..." from the drop down menu.

 

[CTOESHO]

Thank you very much again Scott! I will have the actual dyno sheet posted soon.