Speed limiter
Team Owner
Joined: Jul 2002
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From: This city NEVER sleeps! Frank's back yard!
No vette has EVER had a speed limiter on it. LT-1s have rev limiters to prevent over revving the engine (L98s did not). The ZR-1 had the valet switch to decrease the output to L98 power levels to discourage pilot flights, but this again, did not limit the speed of the vehicle, other than aerodynamic drag.
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Joined: Mar 2004
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From: Ft. Lauderdale Fl
Le Mans Master
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From: Queensland, AUSTRALIA
There is both
There is a speed limiter. End of story. Any reference to there not being one on a 95 LT1 is simply incorrect in every sense of the the word.
And what's more, the barstard works. Ive changed the settings and tried it.
I think that 255mph limit was only a tongue-in-cheek reference to the max speedo readout on the C4.
There is no mechanical or electronic speed limiter on the C4 Corvette. Any reference to one (specifically for a C4) in Hypertech's advertising is in error.
Larry
code5coupe
There is no mechanical or electronic speed limiter on the C4 Corvette. Any reference to one (specifically for a C4) in Hypertech's advertising is in error.
Larry
code5coupe
And what's more, the barstard works. Ive changed the settings and tried it.
Last edited by Casethecorvetteman; Aug 7, 2011 at 01:56 AM.
Team Owner
Joined: Dec 1999
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
"Speed limiting" is a function of the fuel cutoff as shown in the table. My 92 A4 would stumble in 1st gear at an indicated 5800RPM and I actually had to back off the throttle to get it to upshift at that point. 2nd gear was the same; it would stumble at about the same RPM and upshifts only came if I released the gas just a bit.
The idea benihd the fuel cutoff was to prevent excessive and potentially damaging engine RPM and not to limit vehicle speed.
Originally Posted by slicke25
My dads Suburbon cuts off at 100.
Le Mans Master
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From: Ft. Lauderdale Fl
Race Director
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
If the 'cutoff' speed and the 'resume' speed are the same, then there is no cutoff as it would resume fuel flow at the same time that it cut it.
A "speed limiter" that "limits" a car's speed to an impossibly high number does not limit that car's actual speed in any sense of the word.
The C4 may have provisions for a speed limiter in it's ECM, but as it's set from the factory, it doesn't limit the car's speed....except in theory.
Amount of power is the C4's speed limiter.
That's very interesting information regardless, Case. Thank you for showing us that.
Larry
code5coupe
A "speed limiter" that "limits" a car's speed to an impossibly high number does not limit that car's actual speed in any sense of the word.
The C4 may have provisions for a speed limiter in it's ECM, but as it's set from the factory, it doesn't limit the car's speed....except in theory.
Amount of power is the C4's speed limiter.
That's very interesting information regardless, Case.
Thank you for showing us that.Larry
code5coupe
Last edited by rocco16; Jan 24, 2007 at 04:19 PM.
Team Owner
Joined: Jul 2002
Posts: 36,985
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From: This city NEVER sleeps! Frank's back yard!
If the 'cutoff' speed and the 'resume' speed are the same, then there is no cutoff as it would resume fuel flow at the same time that it cut it.
A "speed limiter" that "limits" a car's speed to an impossibly high number does not limit that car's actual speed in any sense of the word.
The C4 may have provisions for a speed limiter in it's ECM, but as it's set from the factory, it doesn't limit the car's speed....except in theory.
Amount of power is the C4's speed limiter.
That's very interesting information regardless, Case. Thank you for showing us that.
Larry
code5coupe
A "speed limiter" that "limits" a car's speed to an impossibly high number does not limit that car's actual speed in any sense of the word.
The C4 may have provisions for a speed limiter in it's ECM, but as it's set from the factory, it doesn't limit the car's speed....except in theory.
Amount of power is the C4's speed limiter.
That's very interesting information regardless, Case.
Thank you for showing us that.Larry
code5coupe
I agree with the above information. If there is a speed limiter, but it is disabled by setting it to the maximum possible mph that the computer can calculate (far beyond the capability of the car), then there is no speed limiter, and the car is limited by the aero drag not the computer. A comparison to a Mercedes product is in order. The vehicle is likely powerful enough to do 190 mph, but the computer limits the top speed to 155 mph. It is top speed limited from the factory, and this can be removed with aftermarket programming.
What I found more interesting is that the LT1 (according to the above tables) is rev limited to about 5800 rpms. I always thought it was 6000 rpm! Lt4 is 6300 rpm, right? Interesting.
Instructor
Joined: Dec 2006
Posts: 122
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From: London England
On a different tack,
what programme is that your`e using case ?
looks pretty good to me mate would you mind posting or pm`ing a bit of info on that cos i`m looking for a data logging/programming system to use with my laptop and don`t have much knowledge or information on whats available or where to get that kind of stuff.
If you could give me a bit of help that`d be great.
Regards,
Eddie
what programme is that your`e using case ?looks pretty good to me mate
would you mind posting or pm`ing a bit of info on that cos i`m looking for a data logging/programming system to use with my laptop and don`t have much knowledge or information on whats available or where to get that kind of stuff.If you could give me a bit of help that`d be great.
Regards,
Eddie
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Joined: Oct 2004
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From: Everett WA
C4 of Year Finalist (appearance mods) 2019
"Speed limiting" is a function of the fuel cutoff as shown in the table. My 92 A4 would stumble in 1st gear at an indicated 5800RPM and I actually had to back off the throttle to get it to upshift at that point. 2nd gear was the same; it would stumble at about the same RPM and upshifts only came if I released the gas just a bit......
, my stock 95 A4 upshifts from 1st to 2nd at an "indicated" 6000 rpm and shifts from 2nd to 3rd at the same "indicated" rpm. While the indicated rpm is probably inaccurate, is it possible that the electronic control in the later year trans was itself set to shift at a certain electronic RPM? I just find it odd that at WOT you would have to actually have to lift your foot for an instant to get it to upshift.Again thanks for your always interesting info
Mark
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From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
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The only thing that limits speed are those things between your legs.
We can argue all night, but the question has been answered, so let's say
and sorry to the original poster that it had to go this way.
We can argue all night, but the question has been answered, so let's say
and sorry to the original poster that it had to go this way.