Cobb AccessPort for 370Z!

Denny McLain

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.

omnomz

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.

WShade

Can you post up the chart?

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Q60 RS400

Denny McLain

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.

omnomz

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.

Denny McLain

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.

Denny McLain

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

t-ray

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?

Denny McLain

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.

drisko

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.

semtex

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

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Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

ssqpolo

no, but they're kickin *** with the GTR right now. The cobb is like the stillen G3s of the GTR...everybody must have! sucks that its not working with the 370z as of now. Im sure when all is sorted out, it will be a great product. right now, i just think they are putting their focus elsewhere...like the GTR

westpak

do it do it

LOL don't how you can resist, we just tuned another GT-R to 545AWHP on the mustang dyno, what a beast

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Scotts-GTR

As a GTR owner I can tell you that life is not the same since the Cobb AP. Its a must have for any GT-R owner. Huge gains to be had in just an AP and midpipe. That said, I am waiting for good results on the 370Z.

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2009 GTR
2009 370Z (Coming 6/09)
2008 X5 5.8

Denny McLain

Because it doesn't work as of yet. Think you answered yourself below.

[/QUOTE]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.[/QUOTE]

Coming from a surgical product development background, understand a few spit balls are thrown at ya at times and it's hard to establish true timelines. Sure they are trying.

My impression is they are a pretty stand-up bunch. However, Cobbs really needs to be a bit more forthright as I really did not need an oil cooler and spent a lot of time lowering my intake temps trying to eliminate that as an issue. Solved a problem that really wasn't a problem, not really fair if ya know what I mean.

Finally got a response back from Neil Bywater at Cobb:

"Denny, we are Still working on updates for the 370Z and I know it can be frustrating but it is a brand new platform. Calvin has been communicating with the engineers in Utah and we will have answers and reasons why the ecu is doing what it is doing as soon as possible. Thank you for working with us.

Neil"

Do what? It doesn't work yet. It's kinda like the old phrase: If if's and buts were candy and nuts, we would all have a Merry Christmas." Right now it's a lump of coal that hopefully will turn into a diamond.

Plus, as probably everyone reading this string knows; tuning works if the tuning program works and forced induction cars are exponentially more responsive to tuning.