TRSCobra

My H/C 510whp '06 Z06 is trapping 125mph on drag radials. Even with a best ET of 11.147. I'm wondering if the car is pulling timing, but all I can log is timing advance with my OBD bluetooth device and the torque app.

I've attached the log from that 11.147 run if someone can help.

Thanks!

edmundu

For only seeing timing...it does not appear that it is a factor in your perceived low trapspeeds. Timing stays steady around 20-21 in the 5k area, and increases to 24 by 7k, and did so with each gear change cycle.

What elevation or more specifically, what DA were the runs at?
Have you tried adjusting your shift points?

Depending on your power curve, and 3-4 being the closest gear rpm drop, you might want to shift out of 3rd by 6500-6700rpm. This will allow you to be fully accelerating through the traps as opposed to just recovering from a 3-4 shift.

sevinn

Torque can log knock retard, you just have to add the PID under "select what to log" in settings. But I agree with edmundu...your car seems to let you run plenty of timing if that is the actual timing advance being logged and not just commanded. So far in my tuning efforts on my boltons ls3 I can only get around 18* max timing but I'm still learning.

TRSCobra

Thanks for the replies. DA was 80' ASL at the time of that pass. I short shifted the 1-2 shift by about 300 rpm, but kept the 2-3 and 3-4 just over 7k rpm.

Next time out, I'll try shifting into 4th a bit sooner and see how that works out. Also, I'll look into that knock retard on Torque.

sevinn

I just remembered that it's an extra PID you have to add. Go into settings>Manage extra PIDs/Sensors and hit the menu button at the top right and "Add predefined set" and click "Pontiac/GM/Opel/Vauxhall"




You'll get a ton of stuff...some of them work and some don't. The one for Oil Temp is off so don't worry about trying to log it. I'm still working on converting the formula for that one.

edmundu

Yes, don't short shift on 1-2, plus shift 2-3 and 3-4 little sooner! This will put you into 4th even earlier(distance wise), ahead of the traps. LS7's pull like freight trains in 4th, and cammed ones even better. This should increase your traps a few of mph.

Try that, and you should see 100+mph in the 1/8, and then another 27-30 mph on the 1/4 trap speed.

TRSCobra

Cool. I love trying different techniques at the track. Especially when they're free!

Dr.Ron

From the in car video, it seems like you need to make your shifts faster, especially the 1-2 shift, which is the most critical in salvaging ET.

Ron

C6z06man

I need a log of the knock to tell. If it knocks and pulls timing you'll have to figure out what the deal is. Same trap speeds on different tanks of gas?

TRSCobra

Got the knock retard parameter. Here's my best run from this past weekend.