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I have not seen anything like that out there for GM like the imports. I have dyno'd several imports with setups like your talking about. Its pretty neat to change the tune with the steering wheels controls. I was pretty shocked by what alot of them could do by button sequences.
If you flash the factory ecm in a c7 gm will be able to tell .
Many tracks have straights that go well above 120 in a car with 650hp.
M7 is a much simpler and direct way to get power to the rear wheels. Torque converter in fluid and wet clutches = wasted power. A M7 will put down more WHP than a A8. The only thing an A8 is more efficient at is shifting speed. The A8 also gets worse gas mileage, and you pay for it. The last facet would be gearing. The lower gearing of the A8's lower gears may mean traction will be more of an issue and harder to control on non-prepped surfaces. That's not even getting into trans cooling issues that would arise first on the A8 before the M7 IMO. Looking forward to real world results.
I havnt found too many applications where the autos didnt have heating problems...were the ones on the track autos????thats would explain alot.
Thank you, thank you for sharing you initial insights into the LT4 and what the Z will be capable of! This is EXACTLY why I love this forum and most of the vendors on it.
Quick question: Did ya'll get a chance to evaluate the PVC system and whether or not it seems better engineered than the one found on the Stingray? As you know, lots of posts related to issues with the PVC system...especially in upgraded LT1s.
Thank you, thank you for sharing you initial insights into the LT4 and what the Z will be capable of! This is EXACTLY why I love this forum and most of the vendors on it.
Quick question: Did ya'll get a chance to evaluate the PVC system and whether or not it seems better engineered than the one found on the Stingray? As you know, lots of posts related to issues with the PVC system...especially in upgraded LT1s.
Keep up the great work! This is like car ****!
There is a new thread on this site titled "Things you don't like" about the new Z06 and the owner is citing Heat Soak and loss of power after 3-4 runs. Are you guys experiencing this problem? Given your HP and tests, I would have imagined that this would have come up, IF it is a real problem? I'm wondering if it isn't internal tuning on his car, but just a guess.
There is a new thread on this site titled "Things you don't like" about the new Z06 and the owner is citing Heat Soak and loss of power after 3-4 runs. Are you guys experiencing this problem? Given your HP and tests, I would have imagined that this would have come up, IF it is a real problem? I'm wondering if it isn't internal tuning on his car, but just a guess.
With the OE calibration we did experience the same thing... The timing tables are EXTREMELY conservative and the ECU will pull timing for almost any situation. I am waiting for owners to complain about "tip in" as the ECU pulls a massive amount of timing when slightly touching the gas pedal.
All that being said, MOST of the loss of power can be addressed in the ECU.. IAT2 temps are actually quite impressive, even after multiple pulls on the chassis dyno. We will get on the highway in the next couple of days and make some back to back "multi gear" runs for comparison sake.
With the OE calibration we did experience the same thing... The timing tables are EXTREMELY conservative and the ECU will pull timing for almost any situation. I am waiting for owners to complain about "tip in" as the ECU pulls a massive amount of timing when slightly touching the gas pedal.
All that being said, MOST of the loss of power can be addressed in the ECU.. IAT2 temps are actually quite impressive, even after multiple pulls on the chassis dyno. We will get on the highway in the next couple of days and make some back to back "multi gear" runs for comparison sake.
That is very interesting. If IATs are good, then a simple tune may correct this problem.
With the OE calibration we did experience the same thing... The timing tables are EXTREMELY conservative and the ECU will pull timing for almost any situation. I am waiting for owners to complain about "tip in" as the ECU pulls a massive amount of timing when slightly touching the gas pedal.
All that being said, MOST of the loss of power can be addressed in the ECU.. IAT2 temps are actually quite impressive, even after multiple pulls on the chassis dyno. We will get on the highway in the next couple of days and make some back to back "multi gear" runs for comparison sake.
Thanks Ron! As I mentioned before, my first modifications after break in will be the Air Intake and a Dyno Tune, so it looks like that should decrease the possibility of my having this problem on the occasional track day. Please keep us informed as this could be a big deal to the new owner of a $100K car!
With the OE calibration we did experience the same thing... The timing tables are EXTREMELY conservative and the ECU will pull timing for almost any situation. I am waiting for owners to complain about "tip in" as the ECU pulls a massive amount of timing when slightly touching the gas pedal.
All that being said, MOST of the loss of power can be addressed in the ECU.. IAT2 temps are actually quite impressive, even after multiple pulls on the chassis dyno. We will get on the highway in the next couple of days and make some back to back "multi gear" runs for comparison sake.
Great info.
It was posted that you were seeing ~20* deltas between IAT1 and IAT2. Did you guys see any major IAT2 increases after those multiple pulls and were they back to back pulls?
S.
Great info.
It was posted that you were seeing ~20* deltas between IAT1 and IAT2. Did you guys see any major IAT2 increases after those multiple pulls and were they back to back pulls?
S.
Average time between pulls so far has been 5 to 7 minutes... We are obviously reviewing data from the runs as well as making changes to the ECU between each run... All of this takes a bit of time so we haven't made run after run just yet.... As I said, we will continue to hit it hard this week and will provide more data for everyone each step of the way.
Great info Ron with regards to the "heat soak" and timing pull issue. Thanks again for your R&D.
Yes Ron. Thank you VERY Much! I think that owners, like myself, are going to need to address this heat soak issue before we go any further with HP gains!
Just to point out...Ron stated that the IAT2's were "quite impressive".
Until there is more data, I am not yet sure that heat soak is the issue.
S.
To me the issue is that GM did not address this problem before they released these cars!!!!!! And now I am wondering if I proceed with my " maybe" allocation this week!
Wonder if GM was desperately trying to avoid the gas guzzler tax and put an extremely lean tune in the new Z... Might explain why so much timing is being pulled at just a few short runs. And also excellent that just a tune to richen it up can fix it
12-07-2014, 04:16 PM
