DrDyno

Although on a slightly different vein... this month's issue of "Corvette Magazine" found the editorial aimed squarely at the Z06's engine overheating problems. Below is the cover and below it is the editorial, which implies the smaller supercharger is the culprit and offer's Callaway's fix...

2007 red corvette

I now own a C7 and was looking at Exhaust mods when I came upon your tread. Pictures are great based on what I am hearing the problem seems to stem from heat transferred from the butterfly valve and shaft to the plastic actuator housing. wrapping the exhaust pipe only in the immediate area of the valve will cut some radiant heat transfer. I suggest attaching some Alum plate between steel valve actuator plate and exhaust pipe maximizing the contact area to act as a heat sink and cooling fin. Any thing you can due to transfer heat away from all the steel butterfly valve(add cooling projections ) will result in lower temps on the plastic. **** poor engineering on GM'S part

SBC_and_a_stick

[QUOTE=DrDyno;1590574515]Although on a slightly different vein... this month's issue of "Corvette Magazine" found the editorial aimed squarely at the Z06's engine overheating problems. Below is the cover and below it is the editorial, which blames the smaller supercharger as the culprit and offer's Callaway's fix...

QUOTE]

I find the Callaway fix a tough pill to swallow. Any real upgrade in water/oil cooling would come with an increase in the 21kw of heat rejection in the C7 Z06. There is 0kw increase in the heat rejection with a supercharger swap.

VERBOTEN

I just killed another set of actuators while on track this weekend. Does anyone know if there has been a part upgrade?

I also have a Borla X pipe on their since the last visit to the dealership.....do you think this would cause a warranty issue. I actually thought the exhaust might run cooler without the second set of Cats.

Thanks everyone.

MJ

BaylorCorvette

Just an X Pipe shouldn't cause an issue with warranty but who knows anymore with what gets voided, since you're deleting the secondary cats.

There is no part upgrade or solution other than what another member (X25) did and cut that section of pipe out and replace with with straight through pipe having the actuators just sit there. Tadge confirmed that the '17+ GS manual and Z51 manual will no longer have the actuators, so they obviously recognize the problem but nothing for those of us with '14-'16's.

Chets LS3

I really think I have someone local that could create a bypass for this. I'm just too danged busy right now!!!

X25

... and here's the link to the aforementioned solution:
https://www.corvetteforum.com/forums...k-driving.html

I've so far had 4 track days with no issues, and hope/expect to never have any.

Newton06

How do you know if the AFM exhaust actuators melt; is a CEL thrown?

I have 8 - 10 track events on my Z51 with no (known) AFM issues.

X25

Yep, you'd see CEL.

Newton06

Just wondering if there is an updated part/solution available for this issue yet?

I received these CEL codes while running an event at VIR last October.

I've been loathe to take it to the dealer as I was able to get it past inspection & it didn't seem like there was any solution other than removing these & locating them next to the exhaust (which is quite frankly, ridiculous), or keep returning to the dealer when these continue to fail during track events due to heat.

Thanks!

daleong

Check out this thread

https://www.corvetteforum.com/forums...te-module.html

mallett435

I installed the AFM delete module and street test is working. Track test at VIR in 2 weeks. 3 day event should be enough to test it.

Newton06

Did you actually remove the valves?

0Cajun @ Edgyvette

We can take care of you on the AFM issue. We are holding our price on AFM delete modules at the discounted rate and will have them back in stock within a week or two

mallett435

No! Stock Borla over the axle pipes with valves. I have the pipes without valves, but leaving as is until warranty is over.

Newton06

SA is claiming that GM will deny the warranty since my car has been tuned. Said they require an ECU dump due to the cost $2k for the parts.

If that is indeed true, then it is utter BS.

I was looking at trading in for a 2017 Z; not if I get treated this way.

How do you get GM Customer Care involved or request an area rep do the same?

mallett435

When my AFMs failed, dealer replaced under warranty and said "good thing you didn't have it tuned or I'd be forced to deny the claim."

Your tuner should just tune the AFMs out and don't use the feature.

BrunoTheMellow

I think they still test during start up and will still throw cel. At least mine did, even after not having 4 cyl mode anymore.

Newton06

Yup. I'm fairly certain you cannot 'turn off' the self check feature.

mallett435

Ok. However, the AFM delete module replicates the AFM communication back to the Chassis Control Module (CCM) with expected response / signal. I'm guessing tuners can't modify CCM like the ECM. Put the car on jack stands or lift, takes 5 minutes to install. Unplug AFM connector from exhaust valve, plug in delete module, secure it,... Problem solved. I'm very thankful for this solution because I was about to buy a z06 just for the removed AFMs. Ha!