I did a hard pull and data-logged it this afternoon.
Temp was 106 today in DFW, my AFR and boost number are calculated
from lamda and pressure. I hit 22.5 PSI of boost, tuners and members
please post your thoughts\comments

Softronic Tune 93 Oct
GMG Headers
Champion Gen1 Turbos
Werks1 Inter-coolers
Cargraphic Race Exhaust



RPM Load Iangle lamda Pressure AFR Boost
4829 189.35 6.75 0.78223 2410 11.498781 20.445
4800.25 190.43 0.75 0.78101 2400 11.480847 20.3
4932.75 189.52 -3 0.77075 2420 11.330025 20.59
4898 190.05 6.75 0.78979 2420 11.609913 20.59
5032 189.09 -2.25 0.78369 2410 11.520243 20.445
4944.5 189.21 7.5 0.79736 2400 11.721192 20.3
5049.25 189.05 -3.75 0.7771 2400 11.42337 20.3
5177 188.93 -1.5 0.79028 2380 11.617116 20.01
5124 189.38 6.75 0.76172 2370 11.197284 19.865
5151.25 189.09 1.5 0.76392 2370 11.229624 19.865
5301 189.59 -2.25 0.78149 2370 11.487903 19.865
5377.5 189.82 -2.25 0.76392 2370 11.229624 19.865
5280.75 190.69 6.75 0.7583 2380 11.14701 20.01
5380.75 191.58 1.5 0.78369 2380 11.520243 20.01
5440.5 191.09 -3.75 0.78198 2400 11.495106 20.3
5571.5 191.02 -3 0.74487 2390 10.949589 20.155
5576.5 191.95 -2.25 0.73828 2390 10.852716 20.155
5570.25 188.98 6.75 0.76514 2400 11.247558 20.3
5590.25 188.74 6.75 0.81152 2380 11.929344 20.01
5599 187.08 6.75 0.76025 2390 11.175675 20.155
5688.25 186.33 3 0.71606 2380 10.526082 20.01
5755 184.8 3 0.76514 2380 11.247558 20.01
5828.75 186.77 -1.5 0.79614 2350 11.703258 19.575
5871.25 183.52 -1.5 0.77661 2360 11.416167 19.72
5926.75 182.6 0 0.73462 2340 10.798914 19.43
5979.25 181.69 0 0.75757 2340 11.136279 19.43
6047.25 181.22 1.5 0.78101 2330 11.480847 19.285
6144 177.91 12 0.77856 2330 11.444832 19.285
6191 176.72 12.75 0.77222 2310 11.351634 18.995
6188 177.21 12.75 0.73047 2290 10.737909 18.705
6206.5 177.77 11.25 0.75366 2280 11.078802 18.56
6305 174.47 12 0.81177 2290 11.933019 18.705
6641.75 150.45 12.75 0.71924 2440 10.572828 20.88
7054 104.13 15 0.80835 2550 11.882745 22.475
7337.75 58.08 15 0.82153 2490 12.076491 21.605

 

I could be way off base but, based on the ignition angle, it looks like the ECU is fighting to keep the motor together.

 

Whoa, hope not.
I will log knock tomorrow to see if the timing is being pulled because of it.

Any other parameters that I need to log?

Thanks

 

I would add IAT, EGT and lambda from both banks & have Scott S. take a look. There is some good data at the end of the "best 997GT2 intercooler" thread on the "technical" forum.

Edit: The logs I mentioned are in this thread (posts 5 & 13) https://www.6speedonline.com/forums/...un-6speed.html

Edit Edit:

Here's your ignition angle graphically:

 

earl3

I will add IAT and EGT to the run tomorrow and if I can add lamda 2 without freezing Durametric.

Thank you for taking time to graph and pointers.

 

Your timing is being pulled due to knocking. The high ambient temp is not helping. I would not datalog again until you deplete your tank of 93 and put in the highest octane you can get your hands on, preferably ms109.

 

I agree.

Youre running 1.4 bar boost there. Are you running that kind of boost on 93/91 octane?

That timing curve would scare the sh*t out of me.

In my logs, if I see a drop from lets say 20 degrees to 18 degrees (just 2 degrees) under full load in the middle of the RPM band I get all bent out of shape.

If you are running 93 octane, I would definetely turn the boost down to 14 psi (or 1 bar) and see what your timing curve looks like.

You are running boost pressures that should ONLY be run with race fuel.

Keith

 

Earl,TTDude,Keith etc

Did another pull and logged additional parameters IAT and EGT.
Ambient Temp was 39*C. I have attached the log for your review.

Your thoughts and comments are appreciated.

 

I am no expert but your timing is really off the charts under load, it definatly does not look happy. After 6k rpms your fuel does not look good, and your boost is not consistent either. i would contact your tuner and get a revision. Try doing a pull at 1 bar and see how your timing reacts.

 

reminds me of this:
Technical data on "flashes"

 

bimmer81

I have emailed the logs to Scott for review and comments.

 

^ Good move! As soon as the boost is in, the timing is all over the place, likely trying to stave off detonation. The AFR also trends rich up top, yet inconsistently so. I'm no 997 expert but, generally speaking, you want to see relative low (but stable) timing through peak torque, then gradually increasing as rpm climbs beyond peak torque (as cylinder pressures drop).

 

Yeah, not much difference from the last one. Timing is really being pulled under load and boost. Get some better fuel in there and relog.

 

I never go below 98 octane, and usually prefer 99 octane, even in my normal road cars. We dont even get fuel here below 95.

 

I will put MS109 race gas today and datalog.

LA8Apex link on "Technical Data On Flashes" is a real eye opener, thanks.

TTDude have been able to datalog? and does your timing look good on Protomotive tune?