Tennis & Golf Nut

At 6:15 in this video the K&N rep said GM has a speed limiter on the Vette, that's why this car only did 190MPH.

Anyone know if this is true?

Only reason I could think of is because of Tire ratings.

He also said the K&N filter will add up to 20HP, not sure if I believe that.

MWAZ

[QUOTE=Tennis & Golf Nut;1586837780

He also said the K&N filter will add up to 20HP, not sure if I believe that. [/QUOTE]

Smart man.

BIG Dave

Operative words are "up to". Which could mean 20 HP, 15 HP, 10 HP, 3 or 2 or even 1 HP.

Tire Guy

But you are correct, in most cases the car is limited by the capability of the tires. This has been a standard for years in the industry.

millpond

Just a slick piece of advertising.

LIStingray

The rumor is it is limited to 300 kph (186.4 mph).
Haven't tested it, so it is unconfirmed in my book.

rsl2715

15 more HP really will start a thread on this one>R

Tennis & Golf Nut

Actually, the rep said they got a minimum of 15 Rear Wheel Drive HP up to 20 RWHP

That has to be the cheapest HP mod yet.

It's on the video at 7:44

jimmyb

I don't think the car is electronically limited by GM, I believe it is aerodynamically/gearing limited. I believe top speed is in 5th gear (at or near redline), 6th and 7th are too tall. The car will NOT maintain top speed in 6th or 7th.

Jimmy

icntdrv55

Jimmy: Aero/drag doesn't mean anything on a dyno.

jimmyb

Obviously....nor does a "top speed" run mean anything on a dyno.
This thread is about the C7 being ELECTRONICALLY limited to 190MPH top speed (which the K&N guy claims), which is FLAT WRONG. In the REAL world, there IS DRAG, and the C7 will NOT do it's top speed in 7th gear as it is on the video. If you shifted from 5th at 190MPH (at or near redline) to 7th, the speed would drop like a rock because of DRAG. In the real world, I bet a C7 wouldn't maintain 170MPH in 7th gear, the ratio is TOO tall, drag is TOO high, and HP is NOT high enough.

And the up to 20 horsepower claim by K&N is laughable. At the max claim (20HP), the car is gaining 4.4% horsepower with an AIR FILTER change???? What material is the original filter made of....steel?

Jimmy

RedC7AZ

If they can do several tests with two identical cars with identical weight drivers, one car with a K&N filter one without, and document all the 0-60 and 1/4 mile runs and if the car with the K&N is faster on more than 70% of the runs, then I might THINK about getting a K&N filter.

Then, even at that, they'd have to swap the filter out of car 1 and put it in car 2 and do run same tests to try to rule out whether one motor was simply faster than the other from the day it was built at the factory.

thedofuss

i have a great idea-- lets everybody post their guess re: what gm did or did not do.

NoOne

Most likely so some idiot doesn't kill themselves by the tires flying apart on a dyno or on jackstands trying to get a picture of the dash at 250mph.


The car cannot go that fast but you could get the tires spinning that fast without a limiter on jackstands/dyno which I bet would end badly for everyone involved.


So the speed is limited electronically in addition to drag limited so the rear tires stay in 1 piece.

HolyRoller

Please keep in mind he's selling something.

If it's really so easy to add 15-20hp without any adverse side effects whatsoever, then ask yourself why GM didn't make K&N air filters original equipment.

HolyRoller

Where does the owner manual mention any electronic speed limiter? Not to be confused with the rev limiter.

jimmyb

Exactly.

Jimmy

Steve_R

Two words come to mind reading K&N's claims: Snake Oil.

golfbone

Frankly if they limited the top speed electronically to 130 mph 90% of the people who own one would never know it unless they read it somewhere.

GOLD72

There was no top vehicle speed electronic programming on the C6 and older vettes. I have yet to hear a definitive answer regarding the C7.