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S.W.G. S.W.G. is offline
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Default 10-22-2016, 10:00 AM

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Originally Posted by Mike_L
I still think the inferior gas has to shoulder a lot of the blame. GM/SAE power testing is done on 93 octane, and California gets 91 or 92 at best. Thats 2.5-3 of knock retard, cutting boost and spark. I believe that a log would have shown that KR and reduced boost.
It's not really an octane issue, its a heat soak issue.
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Default 10-23-2016, 08:31 AM

Terry what does a couple of gallons of E85 added to the tank do for consistency? I know they heat soak easily, but I wonder if a little boost in available octane helps things out any considerable amount.


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Default 10-23-2016, 09:55 AM

I haven't had time to test it out yet. But soon!


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Default 11-01-2016, 12:16 PM

Had a few moments today to get the Z06 on the dyno. It's much cooler today, 60s vs. 90s last go around. Same 93 octane mix.

I was going to do an intake comparison between stock and the AFE intake but I forgot the stock intake so had to settle for a few AFE intake runs.

Net/net car performed better this go around, around 570whp peak. AFE leaned it across the board as expected with the intake rescaling the MAF sensor reading. I monitored timing on all the runs and it was pretty consistent at 18 degrees in the midrange up to 24 degrees at the top of 5th.

For kicks I added a couple gallons of E85 on the dyno to get the mix up to around E20 and the car seemed to like it. After an adaption run or two it leaned out a bit more, made a few more HP up top, didn't trigger any fuel trim faults, etc. Adding 2-3 gallons of E85 per tank is a lot cheaper than adding in 2-3 gallons of 100 so I'll start some longer term testing on that.

What I really wanted to do what determine whether or not the intake was adding any power and while I have some data on that front not enough to make my bold conclusion yet. But I'm getting there.
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Default 11-01-2016, 06:26 PM

Nice, Terry. Can never have enough data.

What made you pick aFe over Halltech?
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Default 11-01-2016, 08:05 PM

Cheaper and easier to order online. But I'll grab a Haltech too later and do a Z06-dyno-palouza.


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Default 11-02-2016, 06:43 PM

If you are bored (and playing with Chevy's!!) have a project for you :-)
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Default 11-02-2016, 10:35 PM

Not surprised about the intake findings. They have been monkeying with the maf housing cross section for years. My C6Z didn't like my killer bee intake much and would occasionally throw lean idle codes. Cool data nonetheless.


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Default 11-22-2016, 08:18 PM

Hey guys,

In between projects I was able to sneak my personal Z06 on the dyno for a little tuning.

Car was on E30 with the rest 91 octane, using HP Tuners for tuning, and tuned it for both the stock intake and AFE intake. Overall was pretty easy to tune and I made several adjustments to the mapped timing decay (IAT, coolant temp) tables to keep it consistent from run to run. As well as the usual fan changes to hopefully improve actual cooling crawling through the staging lanes.

As expected with E30 it picked up more power with more timing. I settled on 2 degrees more than stock up top. It could probably take another 2 degrees more but since I am going to put a 2.3" upper pulley on it soon I'll just evaluate that more next time.

I wasted a lot of time fighting midrange timing retard that I was not able to solve. I verified its below MBT (torque does drop when lowing timing there) but it pulls 4-6 degrees in the midrange via knock retard for no obvious reason. I ended up leaving that part of the timing table stock for now. I tried various minor changes to the knock tables with minimal impact. Short of getting really aggressive on KR dampening not sure how to tackle that problem.

Best run today vs. best run when the car was stock (on ~93 octane). Stock it would drop 10-15whp run after run from the IAT decay and I'm thrilled that is no longer an issue now.



Best run today vs. best run when the car was running stock tuning with the AFE intake and E20. I spent a lot of time today testing out different air/fuel ratios and advance curves and while it definitely makes more torque up in to the 13s on E85 mixtures timing was a little less stable. So settled on around 12.9:1 in the midrange, 12.5:1 up top.



When I was done tuning I decided to throw the stock intake on and retune the same AFR and timing curve for an apples to apples comparison. I found the AFE intake to be worth around ~15whp over the stock intake/filter when everything is matched up. It lets the supercharger produce maybe 1/2psi more boost at higher RPM. I did a couple runs with a K&N filter in place of the stock and it was basically the same as the stock filter. I'm working on a new style of replacement filter for the hell of it that I'll test next time.



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Default 11-22-2016, 09:18 PM

Sweet, rematch at the next NFZ!



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Default 11-22-2016, 09:39 PM

Haha it's such a long drive. Maybe I'll send Ando or Payam down with the car.


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Default 11-22-2016, 11:13 PM

Quote:
Originally Posted by Terry @ BMS
Haha it's such a long drive. Maybe I'll send Ando or Payam down with the car.
I'm down to go next season with everyone. I'm pretty sure both of our cars will be ready by then :D


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Default 11-23-2016, 12:35 AM

Quote:
Originally Posted by Mike_L
GM doesn't have widebands on anything I don't think. I mean Ford only has them on the EcoBoosts. Domestic manufacturers prefer to keep things cheap and simple.
Ford runs closed loop wideband on almost all their engines now. Coyote's got it in 2011.... All Lambda targeted.

Terry, I thought the DI LT4 does use closed loop WOT Lambda targeting???
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Default 11-23-2016, 12:40 AM

I drive the Z06 better then Payam. Results and videos proof


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Default 11-23-2016, 01:34 AM

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Originally Posted by Ando @ BMS
I drive the Z06 better then Payam. Results and videos proof
Where would you like me to ship your cookie?
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Default 11-23-2016, 02:12 AM

Aquamist Meth injection will solve the drop of whp run after run.
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Default 11-23-2016, 09:05 PM

Quote:
Originally Posted by Cory S
Ford runs closed loop wideband on almost all their engines now. Coyote's got it in 2011.... All Lambda targeted.

Terry, I thought the DI LT4 does use closed loop WOT Lambda targeting???
It has crappy narrow band o2 sensors. Wide open throttle is open loop.


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Default 11-25-2016, 01:07 PM

Quote:
Originally Posted by Terry @ BMS
Haha it's such a long drive. Maybe I'll send Ando or Payam down with the car.
I'd imagine there will be another NFZ in CA in the spring.



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Default 11-28-2016, 01:54 PM

Hopefully so. And there is always shift sector.


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Default 12-02-2016, 02:21 PM

Terry, any 60-130 numbers for the car yet?
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Default 12-02-2016, 03:26 PM

No nothing good. Was going to time it the other day with the latest changes but the VBOX decided it didn't want to pickup any satellites.

I actually spent a couple hrs last night developing a low torque map for it. I installed a 2.3" pulley the other day and at full timing it just spins the factory tires through 2nd on a 40mph roll. Sometimes in 3rd too. Knocked timing down 5-6 degrees in the midrange and it seems to have done the trick. Jason is racing our M3 at Famoso tomorrow, I'm going to bring the Z06, for the hell of it.


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Default 12-03-2016, 07:00 PM

Hit Famoso today with the Z06 and M3 for the Redlist drag event. Overall fun day of racing with DA below 1000' which is great for this track. But per usual lots of break downs and delays. I took 3 runs in the Z06 between 10am and 3pm before taking the long drive home.

The Z06 currently has an AFE intake, 2.3" upper pulley, ported throttle body, and is tuned for E30. It's on the factory rims/tires. And a lower torque map I wrote for it.

Two runs launching off idle resulted in 1.7 60' times. I tried one launch going for glory brake boosting but it just spun badly off the line. Overall I found the car pretty predictable and easy to race on the factory tires.

Jason raced the M3 and ran a best of 11.0@133 as of when I left the track. He had a hard time launching it per usual, maybe time for better tires.

The Z06 has a "performance recorder" and here is the video from the run. It's 1/4 mile time is not that accurate though.

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Default 12-03-2016, 07:39 PM

Ah, had to publish it. Fixed. The built in recorder is cool but I wish it showed the rear view camera too in a small window.


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Default 12-03-2016, 09:41 PM

Man that thing is moving!


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Default 12-03-2016, 10:03 PM

Damn that's impressive! Nice work


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