2009 ZR1 tune, a quick look.

[Redline Motorsports]

What were they thinking when they did the PE's. There must be some logic behind it.

Cheers Scotty.

That just cracks me up!

That's exactly what it looks like on a dyno graph when logging AFR. Saw tooth!

I wonder how many grams/cylinder that motor measures at full wick!

[Highlander]

That PE table is proof that they didn't do the VE and MAF correctly.

[Bruce Melton]

The PEs since 06 E38s are not pretty but the PCM is very fast so maybe some overshoot is inevitable?

[Highlander]

No, very much doubt it.. with more reason to be where they should be...

I mean.. they are 10.x AFR from factory when measured with the wideband.

My guess is that it was MUCH easier to tune the PE table for "accurate" readings on the tail than redoing the whole MAF/VE tables, since they probably use a "calibrated" MAF with its correct table. Add to that, that they want the car to be SUPER safe regarding piston temps and you get that 10.x afr on the PE.

Engines vary much in their tuning needs, even from the same production line. So the best "mean" tune is what they input there.

[Bruce Melton]

I agree as to the why the AFRs are intentionally rich, but what I was referring to is why the commanded graph is so jagged compared to lS1/6 controlled fueling. However, it also seems like LS7 power and to some degree torque respond less dramatically to leaner AFRs.
Tuning the PE AFR on the GEN 4 controlled cars seems to me to be much more "touchy". Smoothing the table seems to be counterproductive.
Bruce

No, very much doubt it.. with more reason to be where they should be...

I mean.. they are 10.x AFR from factory when measured with the wideband.

My guess is that it was MUCH easier to tune the PE table for "accurate" readings on the tail than redoing the whole MAF/VE tables, since they probably use a "calibrated" MAF with its correct table. Add to that, that they want the car to be SUPER safe regarding piston temps and you get that 10.x afr on the PE.

Engines vary much in their tuning needs, even from the same production line. So the best "mean" tune is what they input there.

[TAQuickness]

Great work Ross...

They have to use the E67 because it is able to control the Supercharger/Intercooler functions and has provision for the 2nd IAT

I may consider upgrading my PCM for the TT build....

Overview...
Bore & stroke (in): 4.06 x 3.62
Block material: cast aluminum

I wonder what they're doing to keep the mains in place...

[thunder550]

Hardware wise, those cars should be ready to put down some very serious numbers with just a pulley change on the blower. Is the tune set up to accommodate that, or does it look like there will have to additional work done to make it work at higher boost numbers?

edit, just looked at the VE table...that MAP sensor values in the table go all the way to 255kPa? What is that, 2.5 bar or so? If so, that's sweet

[TAQuickness]

255 kPa - 100 kPa (sea level) = 155 kPa or 1.55 bars or 22.48 PSI of boost.

[Chuck CoW]

Well, I spent the last week at Corvettes @ Carlisle...As my guys were wrapping up my booth, I noticed one of the GM guys jumping (dead battery) the new ZR1.




So, who do you think wandered over to him and bribed him to let me pull the tune from the new blue ZR1??!!?!?

Well, a quick look at the vin number showed "EX" as the final 2 digits..EX means "EXPERIMENTAL"....

The dude was shitting....I was this (put fingers close together indicating thousands of an inch) close to cracking him, but...at the last second he caved in and declined....Some fairy nonsense about losing his job or something...

This sucks...When I was in Kentucky a few months back...I tried and the GM engineers in the white shirts looked at me funny....and this time....I CAME SOOOO CLOSE....but just missed it....

There's always the third try!

Maybe Ross will just drop it in my e-mail without me even asking...????

Who knows?
Chuck CoW

[Highlander]

Can a E67 ECM be installed on a ls1?