C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Oct 9, 2009 | 04:35 PM
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Just a queston here. Has any realy aired there c4 out on top speed?? I had mine at 115mph an it seamed like there was a lot of peddle left.
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Old Oct 9, 2009 | 04:41 PM
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135 and yes it had more left.
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Old Oct 9, 2009 | 06:26 PM
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If I remember right these were 150 mph cars when new.
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Old Oct 9, 2009 | 06:46 PM
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I have been 141 with my 383 on a nice country road. To windy but was still climbing slowly
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Old Oct 9, 2009 | 06:46 PM
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Originally Posted by Paul Ruggeri
If I remember right these were 150 mph cars when new.
On my 91 the Governor hit at 125mph. But my 94 don't seem to a have a governor on it. I hit 135 in it in 5th gear. After 100 it was rattling like crazy. (my car not corvette's) Until I get new weatherstripping. and things tight no more over 100 trips for me.



BTW This reminds me of a myth I head long long ago. And I have always wondered if it is true. I remember back in the late 80's and early 90's people said that if you turn the emergency flashers on, On a GM car/truck if would lift the governor. I was told that GM designed it like that for government and emergency vehicle's.

Now that im older, It don't seem to make much sense. But anyone know if this is true or have heard about it before?
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Old Oct 9, 2009 | 06:49 PM
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Originally Posted by aminnich
135 and yes it had more left.


My 95 will hit 135 effortlessly I had plenty of pedal and another gear left

Last edited by aboatguy; Oct 9, 2009 at 06:53 PM.
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Old Oct 9, 2009 | 07:04 PM
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The speedo on my 86 vert only goes to 85mph, so I can do 85+. LOL
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Old Oct 9, 2009 | 07:29 PM
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Originally Posted by speedoholic
On my 91 the Governor hit at 125mph. But my 94 don't seem to a have a governor on it. I hit 135 in it in 5th gear. After 100 it was rattling like crazy. (my car not corvette's) Until I get new weatherstripping. and things tight no more over 100 trips for me.



BTW This reminds me of a myth I head long long ago. And I have always wondered if it is true. I remember back in the late 80's and early 90's people said that if you turn the emergency flashers on, On a GM car/truck if would lift the governor. I was told that GM designed it like that for government and emergency vehicle's.

Now that im older, It don't seem to make much sense. But anyone know if this is true or have heard about it before?

There is a governor? I have never heard of that before....

My car certainly doesnt have a governor. It's called drag limited!
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Old Oct 9, 2009 | 08:04 PM
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Originally Posted by 86IndyCarVette
The speedo on my 86 vert only goes to 85mph, so I can do 85+. LOL
switch to analog?
The bars quit climber but the numbers go to 88mph and im off to the future
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Old Oct 9, 2009 | 08:20 PM
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Originally Posted by 383tpimachine
switch to analog?
The bars quit climber but the numbers go to 88mph and im off to the future
Speedo in my 95 registers triple digit speeds
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Old Oct 9, 2009 | 08:21 PM
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Originally Posted by speedoholic
On my 91 the Governor hit at 125mph.

That was your vagina.

Unless somebody modified the prom, you should have been good to 145+.
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Old Oct 9, 2009 | 08:37 PM
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Originally Posted by abc 123
That was your vagina.

Unless somebody modified the prom, you should have been good to 145+.
Rough crowd



but you are correct no speed limiter in the C4 and a 12Xmph top speed means somethings amiss .....C4s were slippery for their time and the 1984 C4 with only 205 HP could hit 140+ the 1985 hit 150 in numerous magazines.....the LT1s hit the 160s in a couple of magazine tests and the ZR1s were even faster...

Mike
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Old Oct 9, 2009 | 08:50 PM
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Originally Posted by aboatguy
Speedo in my 95 registers triple digit speeds
so does mine good sir
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Old Oct 9, 2009 | 08:57 PM
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I have topped out my 1987 Vert at 150 Mph twice on a cool 60 degree nights with little humidty in the air. When the outside air temps are 80 to 90 degees out, my 87 vert. will run 147 to 148 Mph.
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Old Oct 9, 2009 | 09:22 PM
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Originally Posted by 87 vette 81 big girl
I have topped out my 1987 Vert at 150 Mph twice on a cool 60 degree nights with little humidty in the air. When the outside air temps are 80 to 90 degees out, my 87 vert. will run 147 to 148 Mph.
is it squirrelly at those speeds?
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Old Oct 9, 2009 | 09:53 PM
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Originally Posted by 86IndyCarVette
The speedo on my 86 vert only goes to 85mph, so I can do 85+. LOL
You are doing it wrong. I had an 86 and saw 140 on the speedo. Not on a public road though.
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Old Oct 9, 2009 | 10:28 PM
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many years back ~154 mph in the '89...there was RPM left but no more hp left over to push it any faster.

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Old Oct 10, 2009 | 08:49 AM
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Originally Posted by 87 vette 81 big girl
I have topped out my 1987 Vert at 150 Mph twice on a cool 60 degree nights with little humidty in the air. When the outside air temps are 80 to 90 degees out, my 87 vert. will run 147 to 148 Mph.
Originally Posted by SmokinRide
is it squirrelly at those speeds?
My vert is stable at 155.......

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Old Oct 10, 2009 | 10:04 AM
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My car has plenty of oomph, more than I'll ever need.
I've been up to 180 on a Kawasaki ZZR1200 and that
quenched my thirst for speed, not to mention what it
did for my mild case of constipation.

Speed seekers and Corvettes are synonymous; anyone
who say's he bought a corvette for the color or body
lines isn't being totally honest. Having a corvette under
you with the capability of accellerating and out manuvering
most vehicles on the road is a very tough thing to resist.
The trick is to recognize all the above, use a tremendous
amount of self-control, and enjoy a vehicle that has
become a symbol for the American dream.
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Old Oct 10, 2009 | 10:17 AM
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No, my 87 Vert. is not squirrley at speeds over 140+ MPH.

The Faster you drive the car, the better it handles.

I have Goodyear HP Eagles installed.

Way better than the Yokahamas That were on the car when I bought it nearly 3 years ago.

My 1970 1/2 Pontiac Trans Am handles the same way. The faster You drive it , the better it handles.

Too bad Pontiac is done. They built some fantastic cars too in the 1960's and 70's.

Only other car line I have found personally that will handle like a Corvette with some minor suspension work and good shocks installed.

Things happen a lot faster at speeds above 140 mph. Its not for the inexperienced driver or faint of heart. LOL.
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