Have a meeting to attend bah..

 

Graphs hun! We need the graphs!!! These guys can fix it for you I am sure. Tony is beyond fabulous in customer service so don't get too worried. I am thinking that the folks at the car garage are looking to make a few bucks - sounds fishy if you ask me.

Edit - after I typed my response and the page refreshed I saw the graphs.

 

Give me a few minutes to digest this...

I've got a few questions first. When a car is put on a dynojet, the operator goes in an sets up a new profile. Included in the profile is stuff such as driver's name, type of car, etc. Also included is the indicated redline. From looking at your graphs, it looks like the system was graphing to a 6600rpm redline rather than 7000. Now, I'm sure the guys at z car garage know about the differences in the revup. And I'm sure they ran it to redline as appropriate, but if the software isn't set to 6600, then the graph will be "squished" a bit; roughly 6%.

Second, in which gear was the dyno performed? The numbers look similar to the numbers for my baseline, but the curve looks completely different, especially the a/f numbers.

For comparison's sake, here's my dyno when I just had a ztube (dyno'd in 3rd gear).

 

Sorry to say , But the grafts look real bad to me. That second one looks like it was done on two different dynos.

 

Trey
I like logic in all parts of my life. Your logic is a welcome.

 

Thanks Pasta, but I'm not entirely sure that I've yet added any value to this thread.

 

Cloud,
If you look at my dyno graph, you'll notice that my a/f starts out at around 15 at 3k rpms, then drops in stages. At the end, I was running in the low 12's. Now, keep in mind that this dyno was done in mid-August, in Alabama heat. This is just a guess, but I think that the reason I was riching out so much was because the ECU was dumping fuel to compensate for the intake charge.

When I dyno'd later in November, and again the week after Christmas (much cooler temps), my a/f had leaned out by a good margin. Enough that I was concerned. In my case, I've not been able to determine if my running lean was a result of my mods (crawford cats, ztube, k&n), or because of the cooler temps.

Now, looking at your first dyno, your a/f is running about 14 at 3k rpms, which I think is pretty standard. It richens a bit, but doesn't seem to drop below 13 even at redline. Again, that looks pretty standard.

Now, look at your second dyno. The second dyno, after the MREV, shows that you leaned a tad between 2400 and 3600 rpms, but after that, you seemed to be in line with your baseline. No cause for worry here.

Did Rob mention that you were pinging when he did your baseline? I don't know Rob, and I don't know anything about Z car garage. The dynos show that there was no appreciable difference in your a/f, above 4k rpms, before and after the MREV.

Before you go and spend another $1000, call him and ask him to compare dyno runs 1 and 4 again. Ask him if you were pinging when they did your baseline. Also, find out how much a dyno, plus tuning, costs. Before I spent another 1k to fix what may be phantom pinging, I'd do another dyno and pay for "tuning" time. Ask Rob to datalog while you're dyno'ing, and ask for the hard copy of the datalogging. That way you can definitively see if the engine is pulling timing or not.

Also, find out if he can email you the actual run files. If he can, zip them up and post them here, and we can do some more thorough analysis.

 

Since we've discussed a/f's, we can now discuss your actual numbers. Do you have any other printouts? If so, did they all use a smoothing of 5? Again, compare your baseline against mine. The image I attached also shows a smoothing of 5, and you can see that my lines are nearly flat. Yours, on the other hand, seem to have way too much bounce.. I'd really like to see how much variation there was with no smoothing at all.

Also, you drop almost 10lb/ft of torque at 3600 rpms. That's not normal. Have you ever nocited it when you drive around? According to my baseline(remember, just a ztube at the time), my car also drops at 3600rpms; but I dropped from 199.03@3600 to 196.06@3800, but I climb back to 198.89@4000. You, on the other hand, have a much more dramatic drop.

Honestly, I don't know what to think. You dyno'd on a dynojet. So did I. Looking at the trends of the numbers, our curves are loosely similar. But your numbers appear to be much more erratic. I'm not too concerned about your a/f numbers, or even your peak hp/tq numbers. But I am concerned about the "bounce" in your curves.

 

Cloud,

When I look at your Pre/Post dyno plot here, I'm seeing killer gains. This plot is completely typical of the MREV PLUS results.

Where your bigest gains are comming from is at ~4.5K RPM and good gains up to ~6K RPM.

Yes, your "peak" may have only gone up 5HP but its area under the curve that counts more than anything. Based on your dyno results, you clearly have a faster car. You can be very happy with the results.

As far as the pinging is concerned, I would have it checked by another source. Your A/F ratio is completely unchanged in the area where they said it was pinging... If it was running lean where they said it was pinging, I could see that as a cause, but your A/F ratio is right where it should be.

I also would ask what they intend to fix with the unichip. Your A/F line shown below is not only good, its unchanged from the baseline.

Congrats on the great gains! This is a substantial improvement!

 

I plugged your dyno plot into paint to try to get a better measure of the results.

At 4400 RPM you are making approximatly 22HP and 26 TQ.

 

Thanks tony, also I'd like to mention that Rob was great guy. The dynos probably weren't done too precisely cause he was just doing it out of his own curiosity for free. =D

I'm pretty concerned about the AF drop between 2400 rpm - 3600 rpm that really does not seem too normal ? btw did anyone notice the AF ratio dropped even lower with the Unichip on? I don't really understand how the chip fixes the ratio?

 

You are going to see some drops in the A/F mixture as it goes through the RPM range. Most have drops, leveled out, drop, level out and so on throughout the graph.

As for how the Unichip affects that - assuming this is a piggyback ECU type of thing it does it the same way your ECU does. That being by adjusting the amount of fuel being injected based on the readings from the various sensors in you engine. Now that is a base explanation and I can do a further one if needed. I am assuming a particular level of prior knowledge - if I am wrong please feel free to ask.

 

I was a little confused by some of the other plots and wasn't sure of what test conditions they were showing, but the one reposted in my post above is a spot on pre/post dyno of the MREV PLUS. There is nothing imprecise about the dyno pulls. Rob did a good job.

Possibly Rob was looking for the 15HP/20TQ to occur at their respective peaks. ...But that isn't were MREV does its best work. In any case, you made about 25% more gains than the advertised values shown on the website, so you are good to go!

Oh yeah, and as far as the A/F going down between 2400 to 3600, that means you are running even safer in that area and if you want, you can use a Unichip to bring it up --> and you will make even more gains there.

Unichip can adjust A/F ratio by adjusting the fuel injector duty cycle up or down. It can also kick up even more TQ and HP by optimizing the spark timing. That is the whole trick of tuning.

I will be using a Greddy EU on my Z to essentially do the same thing. But you can be sure I will be applying some new and different "out of the box" mods to make more gains.

300+ NA HP to the wheels is the target!

EDIT: And 300+ is with the MREV PLUS so there will be more area under that 300+ curve too.

 

. . . And that, Sir . . . Is what we are ALL waiting for.

 

Graphs look good. Same gains as everyone else.

"Pinging?" - The only thing I am experiencing is a "roaring" and an occasional "chirp" from my tires... =)

Just waiting on Tony for the next upgrade...