The temptation of the Z06 is strong - Page 2

hockeylover86 · 12-31-2014, 12:33 PM

Quote:

Originally Posted by ilirg

Yeah it does just happen, there are always unknown gremlins with new engines, especially high performance ones like the lt4 If you think GM is going to knowingly release an engine that has a chance of detonating and pay 30k every time they need to replace a motor then

It will be interesting to see what the root cause really was.

I wouldn't consider total engine failure on a $100k flagship car a "gremlin".

Somehow the Dodge Hellcat motors have managed to still stay together at 60hp higher than the LT4. SRT tested the Hellcat at 825hp so I'm sure they have done their homework.

Like I said, hopefully its something not caused from a core component in the engine, and that there is a simple explanation.

SpeedIsLife · 12-31-2014, 12:38 PM

Quote:

Originally Posted by Bhobbs

So when Randy Pobst had to shut the car down because of heat soak, it wasn't because of heat soak?

Correct, the overheating problem was not due to overheating.

GretchenGotGrowl · 12-31-2014, 12:43 PM

Quote:

Originally Posted by Bhobbs

So when Randy Pobst had to shut the car down because of heat soak, it wasn't because of heat soak?

He didn't shut it down due to heat soak. His first lap was his best lap (possibly because of pulled timing due to high IATs), but that's not why he shut it down.

http://m.motortrend.com/roadtests/co...06_first_test/

hotlap · 12-31-2014, 01:11 PM

Quote:

Originally Posted by GretchenGotGrowl

He didn't shut it down due to heat soak. His first lap was his best lap (possibly because of pulled timing due to high IATs), but that's not why he shut it down.

http://m.motortrend.com/roadtests/co...06_first_test/

Difference between first and third lap was 0.5 sec. It flashed high oil temp on the forth. If I was a serious track guy, I wouldn't choose this car. "For the rest of us", the level of performance is "extreme".

Quote:

they'd been timing his laps on their phones: 1:30.17, 1:30.21, 1:30.67...

Pobst pulled back into the pits after his fourth lap, it wasn't because he wanted to stop. The car had flashed an oil-temperature warning on the back straight. "So I stuck it in neutral and let it idle even though we're going 140 mph," he said. It's something to be aware of if you hold wins at the 24 Hours of Daytona or SCCA World Challenge GT series and plan on tracking your Z06 on a warm, humid day. For the rest of us, the extreme level of performance available leaves plenty of headroom.

Bhobbs · 12-31-2014, 01:15 PM

Quote:

Originally Posted by GretchenGotGrowl

He didn't shut it down due to heat soak. His first lap was his best lap (possibly because of pulled timing due to high IATs), but that's not why he shut it down.

http://m.motortrend.com/roadtests/co...06_first_test/

I just watched the video where Carlos Lago discusses the car and Randy got a heat warning on lap 4 or 5 and had to put the car in neutral to cool it down.

The power consistently fell of lap after lap. If that's not a heat issue, then what is it?

ilirg · 12-31-2014, 01:21 PM

These Z's didn't seem to have any heat soak issues....http://www.corvetteforum.com/forums/...tead-80-a.html

GretchenGotGrowl · 12-31-2014, 01:25 PM

Quote:

Originally Posted by Bhobbs

I just watched the video where Carlos Lago discusses the car and Randy got a heat warning on lap 4 or 5 and had to put the car in neutral and shut it off.

The power consistently fell of lap after lap. If that's not a heat issue, then what is it?

Heat soak and overheating are two different things, and conflating the two leads to lots of confusion -- especially the way things spread across the interwebs.

Yes, for someone like Randy Probst to lose 0.5 secs across three laps is a big deal, and hopefully they don't have that issue in the C7Z.R, but for most of the people that will buy and do track days with these cars the 0.5 sec. variance in three laps will be nothing compared to the variance in laps because of their lesser skills. Given several of these cars have been on the dyno (where heat soak tends to be more of an issue) and people aren't reporting unusual IAT increases, heat soak doesn't appear to be much of an issue.

The high oil temperature could be a problem. As far as I know this is the only automatic that has been put in the hands of someone besides a GM employee for this kind of testing. It may be a fluke or it may be a design issue.

The apparent valve train failure on one may also be a problem or a fluke. The loss of power demonstrated in the video with the Viper T/A may also indicate a problem or a fluke. At this point we just don't have many data points to develop a clear picture with, but we can make sure we aren't conflating issues and leading to confusion...unless we really want to damage the rep of the car that is.

ilirg · 12-31-2014, 01:50 PM

There are dyno comparisons between the Viper TA and Z06 from the original video, basically in 4th gear and up the cars have almost equal HP and TQ, being that the viper being 200#s lighter is a no brainer that it will win a roll race. Its as simple as that, the viper is a faster car at higher speeds.

woodside783 · 12-31-2014, 02:55 PM

What I had read was it pulled timing

12-31-2014, 02:55 PM	#23
woodside783 Casey Woodside Drives: a very fun car Join Date: Jun 2010 Location: Tn Posts: 1,906	What I had read was it pulled timing __________________ Instagram @caseywoodside http://youtu.be/CSc9aPh_X_w

12-31-2014, 01:21 PM	#20
ilirg Drives: 2011 Camaro 2ss Join Date: May 2013 Location: nj Posts: 1,559	These Z's didn't seem to have any heat soak issues....http://www.corvetteforum.com/forums/...tead-80-a.html

12-31-2014, 01:50 PM	#22
ilirg Drives: 2011 Camaro 2ss Join Date: May 2013 Location: nj Posts: 1,559	There are dyno comparisons between the Viper TA and Z06 from the original video, basically in 4th gear and up the cars have almost equal HP and TQ, being that the viper being 200#s lighter is a no brainer that it will win a roll race. Its as simple as that, the viper is a faster car at higher speeds.