The vast majority of cars make better power at lower temps and I'm very disappointed there are no provisions to turn the fans on earlier. Guess it's a moot point until a lower temp thermostat is available but I just ordered an oil cooler to see if that helps. Guessing the timing is linked to water temp, but I could be wrong. The new oil cooler should help settle that some. The main issue is obviously software development.

I saw the length of the Stillen Gen 3 tubes laying on top of the engine as being an issue for intake temps and I wrapped them in a double layer of heat barrier hoping it would help. Think the main problem is the filters sit high and get a lot of heat from the radiator and the sun baking on the front. Going to run some duct work to the filters to see it that helps. Cooler weather will answer that one.

Full of ghetto fixes, but so far no cigar.

yeap the intake temps are an issue on the dyno as you usually don't simulate 100 mph wind speeds and also the car sitting while making changes allows the tubes and sensors to heat soak bringing the temps up, the intake temp sensor is part of the passenger side MAF

Denny McLain: check out the modshack air vents for Stillen CAI. His is not for Gen 3 but minor connections make it work for Gen 3. 4 flanges, 4 clamps. LE 3 feet of tubing. This is only additional item for bolt-on Stillen intake, headers, HFC and CBE. But without tuning, still waiting on software, car is running fine. No lean etc. I have to give points to the vent intakes.

Thanks for the heads-up. I'll check it out. Made it through college by sitting next to the smart kids......any ideas are welcome and copying what others have done is OK in my book. Did order the oil cooler and will do it myself, while the front end is off we'll try the ductwork trick.

Literally out the door going to Cobb this morning as doing headers kicked my butt so bad, I'm going to have them install an under drive pulley. Obviously will touch bases regarding the timing issues post what they say.

Thanks again!!

After about a half an hour talking with Calvin while at Cobb, the news is nothing we haven't figured out. The timing tables basically don't do anything. He did say they were getting very close and the variable timing was causing the delay.

I'm going back to the origional Cobb tune and play with the fuel/air a tad to see if it's going lean in a coule spots causing it to pull timing out.

Also...found out you can hook your laptop directly to the ECU using the tuning program and that is the way to log as you get more data vs using the AccessPort.

Well, I finally got my car tuned at Cobb, its amazing now. I lost like 7 hp at the peak of the RPM range, but the gains in hp and tq EVERYwhere else make up for it. The car is much smoother revving (all the way to 8000) and it just pulls so hard. They said they took off the governer too, but I havent had a chance to test that out.

I ordered the GTM oil cooler and test pips and I'm going to go back to cobb when Neil calls to let me know about the variable timing tuning.

Can you post up the chart?

Ya, lets see what that bad boy did. Be sure to include your AFR. Did you you do anyt logging? If so, love to see the intake temps, timing, etc.

Just trying to make sense of all this. You shouldn't have lost anything...period. That's not how its suppose to work.

I'm on a laptop and i dont have access to a scanner. I can have them up very soon.

I havent logged anything with the accessport, I'm still learning this one. i've only used the ones for the Subarus.

Please scan and post. Just read the manual as logging is super easy and do a second gear pull to rev limit in 2nd gear two or three times and post your timing curve. Don't sweat the little stuff as I had to learn how to do it also and it was surprising easy. Hint....a cave man can do it.

Here why.........

1. My car lost midrange power after tuned at Cobbs in Plano

2. Later dyno pulls at RPM to verify Cobbs output and AFR to see if the car would learn and if it would change on it's own. Cobbs post tune dyno curve and RPMs dyno had pretty much the same curve and AFR.

4. As posted above....found out the hard way the timing tables don't work.

5. Been busting my balls to make sure it wasn't intake temps, water temps, oil temps, or lean under 4000 rpm. Added a new oil cooler, did some air cooling tricks so the Gen 3 intake wasn't an issue and pulled out some fuel below 4000. My current intake temps vs ambient are less than 8 degrees difference plus as your aware, (I'm in Dallas) the air temps are very good right now. Low 70's.

Logging today.......Whether it be the new oil cooler, me tweaking the intake temps or just weather....... The car is not pulling out timing throughout the range, it still is however pulling 3-4 degrees between 4500-6000.

Checked the curve of my baseline pulls and my assumption is that before the Cobb tune, it wasn't pulling out timing because the shape had changed. (No dip before)

In the process of e-mailing Calvin my run logs of today. But that is two in a row with more than likely the same issue. Humm......This just might be an issue.

Here is what a typical third gear pull readout looks like: (Sorry if it fits funny, it is what it is when tying to copy and past)

Run 4 Rev 3 Cobb Map - fuel tweaked (Sept 14, 2009)


Seconds (sec)Coolant Temp ( F)Ign Advance ()RPM (RPM)Mass Airflow (g/s) Vehicle Speed (mph)Air Fuel Ratio (AFR)A/F Correct (%)
5.95 183.2 14 4050 173.14 51.57 14.77 100
6.02 183.2 18 4150 177.32 51.64 11.11 100
6.06 183.2 19 4100 172.93 52.94 11.32 100
6.14 183.2 19 4050 174.14 53.13 11.52 100
6.19 183.2 19 4150 171.66 52.75 11.82 100
6.23 183.2 19 4200 179.85 53.13 11.71 100
6.32 183.2 20 4200 181.01 53.81 11.93 100
6.4 183.2 22 4212 180.28 54.31 11.95 100
6.48 183.2 24 4300 185.91 54.8 11.81 100
6.59 183.2 24 4312 188.29 55.49 11.82 100
6.67 183.2 24 4375 188.23 55.99 11.89 100
6.74 183.2 24 4412 189.7 56.67 11.96 100
6.78 183.2 24 4450 191.5 57.23 12.01 100
6.87 183.2 24 4475 191.93 57.41 12.12 100
6.95 183.2 24 4525 194 57.91 12.19 100
7.02 183.2 24 4562 196.92 58.53 12.08 100
7.08 183.2 24 4612 198.55 59.09 11.99 100
7.13 183.2 23 4637 201.09 59.53 11.98 100
7.22 183.2 23 4650 200.16 59.84 12 100
7.3 183.2 23 4700 203.7 60.34 11.96 100
7.37 183.2 23 4737 206.02 60.96 12.08 100
7.43 183.2 23 4800 203.44 61.45 12.15 100
7.5 183.2 23 4825 207.62 61.83 12 100
7.53 183.2 22 4862 212.07 62.45 12.14 100
7.63 183.2 22 4875 210.44 62.63 12.09 100
7.7 183.2 22 4912 213.1 63.07 12.19 100
7.76 183.2 22 4962 217.62 63.63 12.03 100
7.86 183.2 22 4975 216.42 63.94 12.13 100
7.93 183.2 21 5037 220.88 64.62 12.1 100
7.99 183.2 21 5075 225.45 65.24 12.07 100
8.07 183.2 21 5100 223.74 65.62 12.07 100
8.14 183.2 20 5137 227.54 66.11 12.03 100
8.2 183.2 20 5187 231.31 66.67 12.03 100
8.29 183.2 20 5225 229.99 66.98 12 100
8.37 183.2 20 5250 234.26 67.61 12.13 100
8.44 183.2 20 5287 232.54 68.04 12.13 100
8.5 183.2 20 5350 235.78 68.54 12.1 100
8.58 183.2 20 5362 237.73 68.91 12.09 100
8.62 183.2 20 5387 230.92 69.47 12.03 100
8.7 183.2 20 5400 236.01 69.53 12.02 100
8.78 183.2 21 5462 239.47 70.15 12.12 100
8.88 183.2 21 5500 239.9 70.9 11.98 100
8.97 183.2 21 5537 243.37 71.27 12.11 100
9.05 183.2 21 5600 244.67 71.83 12.1 100
9.12 183.2 21 5625 246.01 72.39 12.21 100
9.18 183.2 22 5662 247.07 72.95 12.07 100
9.27 183.2 22 5687 246.22 73.26 12.06 100
9.35 183.2 22 5737 250.19 73.82 12.07 100
9.45 183.2 22 5775 253.39 74.38 12.21 100
9.53 183.2 22 5825 253.57 74.94 12.13 100
9.6 183.2 23 5862 253.5 75.43 12.17 100
9.66 183.2 23 5912 257 76.06 12.12 100
9.75 183.2 23 5937 257.87 76.43 12.23 100
9.83 183.2 23 5975 261.36 76.93 12.11 100
9.93 183.2 24 6012 260.65 77.48 12.17 100
10.01 183.2 24 6050 267.49 77.98 12.28 100
10.08 183.2 24 6112 266.4 78.67 12.26 100
10.14 183.2 24 6137 268.79 79.1 12.47 100
10.23 183.2 24 6162 268.79 79.29 12.34 100
10.31 183.2 24 6212 268.79 79.91 12.2 100
10.38 183.2 25 6250 268.79 80.41 12.2 100
10.44 183.2 25 6300 268.79 80.96 12.18 100
10.52 183.2 25 6437 268.79 81.4 12.24 100
10.56 183.2 26 6375 268.79 82.58 12.26 100
10.63 183.2 25 6325 268.79 82.95 12.39 100
10.67 183.2 25 6387 268.79 82.33 12.35 100
10.75 183.2 25 6437 268.79 82.27 12.43 100
10.83 183.2 26 6437 268.79 83.2 12.38 100
10.93 183.2 26 6512 268.79 83.7 12.34 100
11.01 183.2 26 6537 268.79 84.32 12.46 100
11.08 183.2 26 6575 268.79 84.75 12.42 100
11.14 183.2 26 6612 268.79 85.19 12.4 100
11.23 183.2 26 6637 268.79 85.56 12.34 100
11.31 183.2 26 6675 268.79 85.94 12.26 100
11.41 183.2 26 6725 268.79 86.68 12.29 100
11.49 183.2 26 6762 268.79 87.12 12.25 100
11.56 183.2 26 6800 268.79 87.55 12.22 100
11.62 183.2 26 6837 268.79 88.17 12.25 100
11.71 183.2 26 6862 268.79 88.42 12.28 100
11.79 183.2 25 6900 268.79 88.92 12.26 100
11.89 183.2 25 6937 268.79 89.54 12.28 100
11.97 183.2 25 6987 268.79 90.04 12.07 100
12.01 183.2 24 7037 268.79 90.53 12.2 100
12.09 183.2 24 7050 268.79 90.66 12.25 100
12.17 183.2 25 7075 268.79 91.4 12.45 100
12.27 183.2 26 7125 268.79 91.84 12.58 100
12.36 183.2 27 7150 268.79 92.21 12.51 100
12.4 183.2 27 7150 222.21 92.77 11.74 100

Any significance to the fact that your MAF has a constant reading from ~6150rpms onward? During that period you have increased actual roadspeed by 13mph.

And according to this thread, that would mean that your MAF is seeing roughly 474cfm of flow.

Which begs the question: is the MAF reading a combined reading, or what?

I don't have a frickin clue. Didn't notice it untill you pointed it out. Also, sent e-mails to three people at Cobb and so far nothing back.

Why hasn't COBB released any base maps yet!? The current firmware is still technically the 350Z version...still has the 350Z image and model description is "350Z".

Wish COBB would at least give us an ETA on when the 370Z is going to be "officially" supported. I just called them today and they couldn't give me a date or even if they had made any progress on it.

Yeah, COBB isn't doing much for their reputation amongst 370Z owners, are they? :shakes head: