Ema Scema

New corvette owner, I've read a lot of threads on v4 to v8 mode, it's a corvette for heavens sake, don't we like power over gas mileage? Why did the Kentucky boys decide to go with mileage? I would pay the gas guzzler tax to eliminate the obtrusive v8 to v4 mode.
Don't know how many of U corvette owners agree with me, I'm sure some of you object to pay an extra $ 1500
gas tax on an already expensive car.

Vetteman Jack

Moved to C7 Gen section.

JerryU

Could have accomplished your objective for "less" not more money! Should have bought an M7!

I have been in V4 mode less than 5 times in 3+ years, just to see what it's like! With an M7 it only comes in in ECO Mode. I drive in Sport 95+% of the time.

BEZ06

First of all - WELCOME TO THE FORUM!!!!

This is a great place to get info and you can also rant about your concerns and problems. I look forward to your continued posts!

I don't agree - I have an M7, so didn't have to pay the gas guzzler tax. I believe only if you buy an A8 do you need to pay the tax.

I'm REAL happy that I didn't need to pay the gas guzzler tax!!!

It's not the Kentucky boys (or Michigan boys) that "decide to go with mileage" - it's the gubmint!!! Or, more specifically, the greenies in our society.

Don't blame a car manufacturer for trying to make more fuel efficient cars - rather blame the CAFE regulations the tree huggers shove up our.....

Take a look at info about the CAFE regs here:

https://en.wikipedia.org/wiki/Corpor...e_Fuel_Economy


In there you can read about the requirements for a manufacturer to meet a certain mpg average for the fleet of vehicles they build - like the info below:

Bottom line - the AFM doesn't bother me. With my M7 LT4 I have a real hard time getting it to go into V4 mode - like JerryU said in his post above, the M7 needs to be in ECO mode, and I just don't drive in that mode. When trying to get it into V4, driving along at 60mph or above I just can't get it to go into V4. If I slow down to 55mph in 7th it still won't do it. If at 55 I downshift to 5th I can get it to go V4, but the mpg goes from 27 down to 26!?!? So, I don't find the AFM intrusive at all because it just doesn't do it in my car!! After trying to see how it worked and seeing that it's very difficult to get it to go into V4, I don't even worry about it in my car because I know it just doesn't do it!!

.

JonMN

A8 here. I agree AFM is an odd choice for a sports car . .. but, if AFM bugs you, you can either drive in Manual mode (which is pretty fun, by the way) or buy a disabler from Range Technologies and plug it in. Takes about 10 seconds to install! But first see if you even notice it . . . it's pretty well integrated.

sTz

I'm not too concerned about gas mileage, however, I wasn't thrilled about paying a gas guzzler tax on my previous GT500s. If you don't like AFM, you will not like the start-stop feature, which will probably be phased in at some point.

As mentioned, if it bothers you that much, get a M7... that's what I did and have yet noticed AFM. You can also disable it via tuning.

Ernest_T

I have an A8 and it's much more enjoyable with the Range Technology AFM Disabler. I use a OBDII extension with on/off switch.

Rebel Yell

That's the ticket, and cheaper than trading for an M7. I went in with an open mind concerning the AFM, and found it doesn't really bother me. As Jon says it works pretty well, and most times I never notice the switch. A few times on the interstate at cruising speeds I have felt a little jitter when it switches back to V8 while going up an incline.

Welcome to the forum.

devnull

So the A8's go into 4cyl mode even in sport? I have a M7, and didn't realize that. Wow.

Emerald Eagle

I don’t quite understand the seemingly cavalier attitude about using more resources than necessary. AFM makes the C7 one of the most versatile Sports/GT car ever. You can go like jack the bear any time you want and then slip into “E” and 7th and cruise by little cars in greater comfort while using less fuel.

Ernest_T

I hear what you're saying, but there are plenty of economy cars out there if you are so inclined. The car drives much better without AFM.

stevebz06

This is a real sore point for me: Mr "Inconvenient Truth" Al Gore flies around the world in his Grumman Gulfstream blowing three TONS of kerosene out the tailpipes in the first HOUR of flight on his way to some $10,000 a night resort to lecture the rest of us on the environment. The gall is unbelievable!

Just by coincidence I just received a text message from s friend in Lima, Peru. She saw Obama departing the airport in Air Force 1. She said his entourage had a total of 8 airplanes.

And they hey are worried about us driving a sports car or a Suburban?

pkincy

I have run into a problem with AFM on my 16Z with A8. I bought and installed one of the first Mild2Wild switches for the C7 this month. Installed it and hate it! Why? The most effective use of it is to put the car in Stealth in Settings and then the mufflers are either all on or all off. And in an A8 the car sounds terrible in V4 mode, which is low rpm local driving at low rpm. A lot of what we have to do in a city. I will try the ranger solution before I throw out the Mild2Wild switch.

JonMN

FWIW I use both Range and Mild to Wild on my A8. Fun combo!

cwing85b

I understood that the "mild to wild switch" controlled the "NPP" valves not the AFM valves.
Interesting.

pkincy

You are correct but the sound unmuffled in V4 mode is terrible. Kinda like a Viper where you can only hear 5 cylinders on one side of the car. So the M2W is unusable at low rpm (at least to my ears) with an A8 due to the AFM causing V4 a lot.

No problem with an M7 as you just stay out of ECO mode.

cwing85b

makes sense.

Skidplate

No C7 has a gas guzzler tax. The Automatic Z06s do.

JerryU

In fact when I have used it to test the extra fuel economy in my 16 mile trip from town on a flat Interstate at best I got 2 mpg better in 7th at 70 mph. Perhaps because I don't have a torque converter I definitely felt the transition as a slight bog. Even on a slight incline it switches back to 8 cylinder.

Can't say I heard a significant difference. I drive in Sport, so NPP has the pipes closed for quite mode when cruising. I also always have my sound system playing "Oldies" from an SD card which drowns out the road and tire noise so perhaps I just don't hear the difference.

MAKC7

If you are a new owner, then go to Spring Mountain. They drive the A8's in the manual mode 100% of the time which eliminates the v4 mode. Since I attended, I drive my A8 in the manual mode all the time. Did not purchase a Vette for its gas mileage.