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Along the Vermillion Cliffs in Arizona, long enough ago that the statute of limitations has run out, we 'poked' along at an indicated 135. 1970 LT-1, 3:36 rear. There's a 90-degree left hander at the end of that straight!
My 71' tops out at 137 mph on GPS, 6300 rpms with 3.36 gears, 28" tires, T400 with a 10" converter. It would probably have another 200 rpms in it but it sounded like it was trying to float valves so I let out..
My car has a horrible tendency to oversteer and Im still trying to figure out the alignment issues thats causing that....
So, when my 454 gets over 90 MPH (which I get to REAL quick) it gets very scary. Also, running generic sidepipes makes it sound like its going to blow up at those RPM's.
My vette use to do that, it stopped when I replaced the rear spring, my guess is that the rear spring was so worn that anything over a hundred and it was squatting, changing the alignment.
I think the OPs 74 will probably peak about 120...I ve had mine up to 150 mph.. it had more left , but the road didn t allow it .. I think it would run out the 160 MPH Speedo.. but of course I would NEVER break the posted speed limit....
Last edited by fishslayer143; 02-12-2016 at 08:31 AM.
You guys are NUTS! If you think that you have any control on a car going 120MPH you are sadly mistaken. Newton takes over at about 80.
No guts...No Glory..... I have taken my C5 to 175 mph.. seemed to be in complete control .. The car actually handled the speed extremely well. It was designed to go that fast, has Z-Rated tires, What could Newton do? It was out in Texas on a straight rural Interstate hiway with ZERO cars around..
Even with Massive HP, the C7Z06 cannot get more MPH after 5th overdrive. Probably could get more MPH in 6th but it would take a massive increase in Net HP over the 650 it has already...say 800 NET HP
Lots of assumptions here but here we go:
If you had the 3.70 gear with a 27 inch tire (which you do not), your top speed in 4th 1:1 would be about 130 MPH at 6,000 RPM. Since you have a shorter tire 25.55 inches, your top speed at 6,000 RPM would be substantially less since a shorter tire acts like a higher numerical rear gear..say 4.11's. Let's say with your tire in 4th gear you would top out at 120mph in 4th @ 6,000 RPM. The C7Z06 with 650 NET HP!!! overcomes any of the overdrive gears to hit 186 MPH track limited by the aerodynamic add ons that actually do add down force on this car. Not knowing the HP (mostly like in Gross Ratings) of your 385, even if it has 500 GROSS HP, that would roughly equate to 425 NET HP which is 225 NET HP less than the Z06 but you have a 300 lbs weight advantage. The weight advantage is more beneficial to acceleration than top speed. The 6th overdrive will not add anything to the top speed just the 5th overdrive. Depending on the overdrive ratio and assuming 425 NET HP can hit redline in 5 th AND considering the tremendous aero drag and lift from the 80 body, I would guess the top speed is somewhere between 140-145 MPH.
Is the C7 top speed possibly limited to 186 by the computer?
My ZX14R's and other "hyperbikes" were limited by factory.
Remove limit and shorty exhaust, had one that could hit 230.
I'm curious what the C7 would do (if it has a limiter) -- without the limiter?
I think the OPs 74 will probably peak about 120...I ve had mine up to 150 mph.. it had more left , but the road didn t allow it .. I think it would run out the 160 MPH Speedo.. but of course I would NEVER break the posted speed limit....
I too have a 74. Keep in mind, 190 hp is Ford Escort territory, so downhill, with the wind in fairly stock form you should be able to hit at least 85....lol
Sorry bro. I drove mine down my 1/8 mile driveway, turned her around and went back, ripped that poor example of Corvette pride out and installed a blown LS engine and overdrive transmission. Now, she has well over 700 reliable hp and gets 17.6 mpg @65 with 3:73 cogs. Top speed? Dunno. My ***** aren't large enough to find out...
Patrick,
in regards to your " not big enough" dilemma.......
Ecklers is having a weekend sale, may have a larger pair in stock for a reasonable price? ( Not counting shipping)
By the way, I think your car is awesome! I can only hope my ls swap turns out half as impressive.
jeff
Is the C7 top speed possibly limited to 186 by the computer?
My ZX14R's and other "hyperbikes" were limited by factory.
Remove limit and shorty exhaust, had one that could hit 230.
I'm curious what the C7 would do (if it has a limiter) -- without the limiter?
There is no limiter on a C7Z06...estimated top speed is about 200 mph given a long enough run...aero drag limited
Because of wind resistance it takes 4 times as much horsepower to double the speed. So if a vehicle can go 100 mph with 100 horsepower it'll require 400 horsepower to hit 200 mph and 1600 horsepower to hit 400 mph.
135 in my '71 ZZ4 4 speed 3:36's. Anything over 120 and it gets real light on the front end. That's when my small ***** kick it. I only braved 135 just to see what it could do. It had just a bit more in it I think.
We took a 70 L46 (350/350) autocrossing on one of the large NASCAR tracks,and with gearing and tire size it did 142 mph. It would have gone faster, but likely would not have lived. Dad’s 1970 LT-1 was up to an indicated 135 when he bought it in 1970, with 3.70 gear. Said it was light in the front. I have only gotten my 70 LS5 up to 100 mph, but seems fine and just no desire to run it harder. My 95 coupe I had to 157 mph and was stable with plenty left, before I let out.
Maybe I used the wrong term. The car 'wanders'. It doesnt like to track straight. If I take my eye off the wheel for one second (to maybe look at my watch) Im damn near in the next lane. ALL suspension components have less than 1K miles on them. The alignment shop I used was somewhat familiar with Corvettes but only had access to stock measurments. I think it needs more negative camber, but Im no expert and sadly, nobody in my neck of the woods is willing to do an alignment on an old Corvette.
Scott I know what your talking about .
A c3 with lots of real power with stock suspension system ,can just about do anything when you change gears .
The front drops then raises again as you change gears ,
I have seen my car move side ways, Do a completer 360 on the 5th to 6 change up and my car only has 650 hp.
I’m now running ridetech much more predictable
bfit
Your numbers are right on....Even with the anemic stock engines in the 70's, the 4 speeds cars and 3.70 gears like my 78 topped out (documented in the car magazines) at 5,500 RPM (78 L-82) at 119 mph...130 mph at 6,000 RPM. A stock L-82 if it had a 3.08 gear with the 4 speed (which it did not) would hit 150 MPH at 6,000 RPM...might take a while to get there, but it would do it.....My 2010 totally stock C6Z06 given a long enough flat road will top out at 198 MPH (documented as well)..now that is serious top end.....
In theory that'd be the top speed by the numbers.......in real life though.......no chance what-so-ever. The L82 didn't make enough Horse power to push through the air anything close to that theoretical speed suggested by the gear ratio numbers.
An awful lot of modern cars with far larger power numbers than an L82 can't manage that speed even in car styles that "slip" through the air with more efficiency that a C3.
Your C6 in comparison to an L82 powered C3......doesn't even belong in the same paragraph the the two cars and motors are just so very far far apart in terms of an ability to reach terminal velocity.
Your C6 is a hot knife going through butter........the L82 powered C3 is more like the dull spoon attempting to carve it's way through a leather shoe.
(Nobody should get their panties in a knot over that last statement.......I'm allowed to make the critique.......I own a C3 too and have no delusions about the weaknesses it came with when I bought it)
In theory that'd be the top speed by the numbers.......in real life though.......no chance what-so-ever. The L82 didn't make enough Horse power to push through the air anything close to that theoretical speed suggested by the gear ratio numbers.
An awful lot of modern cars with far larger power numbers than an L82 can't manage that speed even in car styles that "slip" through the air with more efficiency that a C3.
Your C6 in comparison to an L82 powered C3......doesn't even belong in the same paragraph the the two cars and motors are just so very far far apart in terms of an ability to reach terminal velocity.
Your C6 is a hot knife going through butter........the L82 powered C3 is more like the dull spoon attempting to carve it's way through a leather shoe.
(Nobody should get their panties in a knot over that last statement.......I'm allowed to make the critique.......I own a C3 too and have no delusions about the weaknesses it came with when I bought it)
Ok Ok..I concede that 150 may be a little optimistic. Let's call it 135MPH with 3.08-3.36 gears if someone was crazy enough to try it. Your analogy to the C6Z06 was hilarious and true....My 425 Gross HP 355 L-82 is zero match against my Z06...very true
I will also admit more than a couple of occasions driving the Z06 where I have with very little effort in 4th gear pulled away from some bonehead drivers and touched 110-120 MPH for a brief second with zero effort..I mean zero! Scary fast......but stable as a rock. The Z06 is a race car that is street legal....
02-11-2016, 09:27 PM
