Who had their c4 go 200MPH ? - Page 2 - CorvetteForum - Chevrolet Corvette Forum Discussion



C4 General Discussion
General C4 Corvette Discussion not covered in Tech

Who had their c4 go 200MPH ?

Reply
 
 
 
Thread Tools Search this Thread
Old 09-11-2017, 11:35 AM   #21
BrandensBeast
CF Senior Member
 
BrandensBeast's Avatar
 
Member Since: Oct 2015
Location: Connecticut
Posts: 1,629
Thanked 133 Times in 128 Posts
Default

Haven't had the room or ***** to go past 120 in mine, an old car with new tires doesn't make it a new car! At what point would you go from 5th to 6th?

Last edited by BrandensBeast; 09-11-2017 at 11:38 AM.
BrandensBeast is offline   Reply With Quote
Old 09-11-2017, 11:47 AM   #22
whalepirot
CF Senior Member
 
whalepirot's Avatar
 
Member Since: Jan 2008
Location: Mission Viejo Kali
Posts: 1,632
Thanked 53 Times in 52 Posts
Default

Quote:
Originally Posted by Hot Rod Roy View Post
I've tried, but I keep running out of on-ramp!
That, there's funny!


My '71, with crate LS6 did 160 in Colorado, back when I could think that fast. I'd made a large spoiler so the nose stayed planted, perhaps too much.

Did 150 back when the '84 was stock and about a year old. No wandering AFAIK. With the new motor, it should make 185, but I'll wait until Roy finds a long enough on-ramp!
whalepirot is offline   Reply With Quote
Old 09-11-2017, 12:44 PM   #23
bac22
CF Senior Member
 
bac22's Avatar
 
Member Since: Feb 2000
Location: Epping NH
Posts: 5,048
Thanked 45 Times in 44 Posts
Default

Back in the the late 1990's hit 168MPH in my LT4, think she had about 5MPH more, but ran out of straight road. I seem to recall that Road & Track said the LT4 had a top speed of 180MPH. That was back in my crazy track days, now a days, just the quick spurt on an on-ramp is about it.

Last edited by bac22; 09-11-2017 at 12:46 PM.
bac22 is offline   Reply With Quote
Old 09-11-2017, 01:27 PM   #24
Tom400CFI
CF Senior Member
 
Tom400CFI's Avatar
 
Member Since: Aug 2004
Location: Park City Utah
Posts: 11,153
Thanked 306 Times in 283 Posts
Default

Quote:
Originally Posted by BrandensBeast View Post
At what point would you go from 5th to 6th?
Never, because...

Quote:
Originally Posted by Tom400CFI View Post
all C4 6 speeds, C5 and C6 will not hit top speed in 6th gear.

Top speed is in 5th gear. 6th is for fuel economy.

Last edited by Tom400CFI; 09-11-2017 at 02:41 PM.
Tom400CFI is online now   Reply With Quote
Old 09-11-2017, 01:57 PM   #25
856SPEED
CF Senior Member
 
856SPEED's Avatar
 
Member Since: Apr 2007
Location: O'Fallon Missouri
Posts: 2,051
Thanked 30 Times in 30 Posts
Default

Quote:
Originally Posted by Tom400CFI View Post
Never, because...

thats right...in fact you will lose speed in shifting into 6th gear compared to 5th...and for mechanical reasons 6th gear should not be utilized under WOT conditions... it's not designed for that load.
856SPEED is offline   Reply With Quote
Old 09-12-2017, 08:24 AM   #26
BrandensBeast
CF Senior Member
 
BrandensBeast's Avatar
 
Member Since: Oct 2015
Location: Connecticut
Posts: 1,629
Thanked 133 Times in 128 Posts
Default

Quote:
Originally Posted by Tom400CFI View Post
Never, because...
Quote:
Originally Posted by 856SPEED View Post
thats right...in fact you will lose speed in shifting into 6th gear compared to 5th...and for mechanical reasons 6th gear should not be utilized under WOT conditions... it's not designed for that load.
Thank you guys for that information
BrandensBeast is offline   Reply With Quote
Old 09-12-2017, 03:28 PM   #27
PLRX
Semper Fidelis
Support Corvetteforum!
 
PLRX's Avatar
 
Member Since: Aug 2005
Location: Riverside County Southern California
Posts: 30,485
Thanked 280 Times in 206 Posts
Default

Only a C4 body with all types of aero and HP modifications. That means the stock transmissions are also out of the equation.

The answer is no.

Long ago I had Betty Boop up to 168 MPH

Had The Ghost up to 154 MPH (recorded), 165 MPH unrecorded


PLRX is offline   Reply With Quote
Old 09-13-2017, 02:22 PM   #28
rklessdriver
CF Senior Member
 
rklessdriver's Avatar
 
Member Since: Apr 2005
Location: Dale City VA
Posts: 3,134
Thanked 101 Times in 90 Posts
Default

Couple of years ago I took a CF member for a "demonstration ride" in my 92..... Keep in mind the car made 480+RWHP and 420RWTQ naturally aspirated, had a ZF 6spd and 4.10 rear gears, MT 315 drag radials, 4pt roll bar.... car was my daily driver at the time.

I drove him around on secondary streets a bit. Showed him how tractable the car was in everyday driving, then we made a few easy power pulls in the lower 3 gears which really were nothing but a lot of peddling to keep the tires hooked.....

I got it out on I-95 and rolled into the throttle hard, wound it up to 7400RPM and then pulled another gear..... I kept in it till it sounded pretty good too me and it occurred to me that we were really moving out.... I was pretty focused on driving the the car but I looked over to see how he was liking the ride and I noticed my passenger was looking a little pale, so I eased out of it and slowed the car down..... That's when I realized I had started from a 4th gear roll, then grabbed 5th gear and held it..... Whoops! I just played it off and asked him if he thought it pulled hard enough.... LOL. Took the next exit and drove on back to the house like I did that stuff everyday.....

I went back later and checked the logs..... the data showed I held to 7250RPM in 5th. 180MPH maybe a tick more depending on tire growth.

My 92 went a bit over 182MPH at the Maxton Mile a few times with a 3.90 rear gear.... pretty impressive for what it was. Even given enough distance I would have had to go down to a 3.73 rear gear to get the car over 200MPH..... even with the 3.90 I would have needed 7600RPM to break 200MPH and my engine was stretched to the limit turning 7400RPM with the hyd roller cam.

Be careful out there.
Will

Last edited by rklessdriver; 09-13-2017 at 02:23 PM.
rklessdriver is offline   Reply With Quote
Old 09-13-2017, 02:40 PM   #29
Silver85
CF Senior Member
 
Silver85's Avatar
 
Member Since: Nov 2016
Location: Buchanan GA
Posts: 534
Thanked 49 Times in 46 Posts
Default

Mine will do 200......if I flip the little switch to Metric.
Silver85 is offline   Reply With Quote
Old 09-13-2017, 03:00 PM   #30
QCVette
CF Senior Member
 
QCVette's Avatar
 
Member Since: Jun 2009
Location: Mclean IL
Posts: 5,154
Thanked 231 Times in 207 Posts
Default

Back when my '85 was pretty new I saw 150 and it was still climbing (very slowly). It was pretty near to topped out.

Since then I have had 7 or 8 cars that were faster, but I never tried them out for top speed. I discovered that I enjoy acceleration and cornering more than top speed runs, so I enjoy (abuse) my cars in a different way.

Good luck and be safe out there.
QCVette is offline   Reply With Quote
Old 09-13-2017, 08:05 PM   #31
pologreen1
CF Senior Member
Thread Starter
 
pologreen1's Avatar
 
Member Since: Dec 2007
Posts: 14,671
Thanked 94 Times in 92 Posts
Default

Quote:
Originally Posted by rklessdriver View Post
Couple of years ago I took a CF member for a "demonstration ride" in my 92..... Keep in mind the car made 480+RWHP and 420RWTQ naturally aspirated, had a ZF 6spd and 4.10 rear gears, MT 315 drag radials, 4pt roll bar.... car was my daily driver at the time.

I drove him around on secondary streets a bit. Showed him how tractable the car was in everyday driving, then we made a few easy power pulls in the lower 3 gears which really were nothing but a lot of peddling to keep the tires hooked.....

I got it out on I-95 and rolled into the throttle hard, wound it up to 7400RPM and then pulled another gear..... I kept in it till it sounded pretty good too me and it occurred to me that we were really moving out.... I was pretty focused on driving the the car but I looked over to see how he was liking the ride and I noticed my passenger was looking a little pale, so I eased out of it and slowed the car down..... That's when I realized I had started from a 4th gear roll, then grabbed 5th gear and held it..... Whoops! I just played it off and asked him if he thought it pulled hard enough.... LOL. Took the next exit and drove on back to the house like I did that stuff everyday.....

I went back later and checked the logs..... the data showed I held to 7250RPM in 5th. 180MPH maybe a tick more depending on tire growth.

My 92 went a bit over 182MPH at the Maxton Mile a few times with a 3.90 rear gear.... pretty impressive for what it was. Even given enough distance I would have had to go down to a 3.73 rear gear to get the car over 200MPH..... even with the 3.90 I would have needed 7600RPM to break 200MPH and my engine was stretched to the limit turning 7400RPM with the hyd roller cam.

Be careful out there.
Will
Wow that is screaming with those gears. Could you do that with auto?
pologreen1 is offline   Reply With Quote
Old 09-14-2017, 09:35 AM   #32
cuisinartvette
CF Senior Member
 
Member Since: Oct 2004
Location: Valencia Ca.
Posts: 62,472
Thanked 609 Times in 561 Posts
Default


did the same thing with my 'El once the 383 was running...4.11 gears 26 in tire T56
Let off in 5th gear at 6800 then the inner alarm of "this is go to jail stuff" rang;it got there pretty quick.....the Z took forever

Musta looked strange some dude looking like colonel sanders flyin by

no interest in that stuff anymore things happen too fast you have 0 control
0-120 quick is more than enough

Last edited by cuisinartvette; 09-19-2017 at 04:27 PM.
cuisinartvette is online now   Reply With Quote
Old 09-14-2017, 11:14 AM   #33
rklessdriver
CF Senior Member
 
rklessdriver's Avatar
 
Member Since: Apr 2005
Location: Dale City VA
Posts: 3,134
Thanked 101 Times in 90 Posts
Default

Quote:
Originally Posted by pologreen1 View Post
Wow that is screaming with those gears. Could you do that with auto?
Sure I could.

I haven't been to a 'Top Speed" event since Maxton closed, but I'm thinking about changing the rear gear and TQ converter in my 84 Corvette and trying my hand with it at one of these events.....

It's been 165MPH in the 1/4 mile. Probably be pretty fast on top end with the right gear and converter.

Will

Last edited by rklessdriver; 09-14-2017 at 11:17 AM.
rklessdriver is offline   Reply With Quote
Old 09-14-2017, 12:44 PM   #34
pologreen1
CF Senior Member
Thread Starter
 
pologreen1's Avatar
 
Member Since: Dec 2007
Posts: 14,671
Thanked 94 Times in 92 Posts
Default

Quote:
Originally Posted by rklessdriver View Post
Sure I could.

I haven't been to a 'Top Speed" event since Maxton closed, but I'm thinking about changing the rear gear and TQ converter in my 84 Corvette and trying my hand with it at one of these events.....

It's been 165MPH in the 1/4 mile. Probably be pretty fast on top end with the right gear and converter.

Will

Are you in D or OD? if in the 1/4 I assume D right? If you go top speed running you'll change rear and stay in D right?

I just want to make sure we are on the same page.

My car has 26" tires, 3.45gear.

http://www.angelfire.com/fl/procrastination/rear.html
pologreen1 is offline   Reply With Quote
Old 09-14-2017, 12:45 PM   #35
JrRifleCoach
CF Senior Member
 
JrRifleCoach's Avatar
 
Member Since: Sep 2003
Location: Criminals obey guns laws like politicians follow their oath to office Republik of Kalifornico"
Posts: 17,480
Thanked 144 Times in 133 Posts
Default

Quote:
Originally Posted by SuperL98 View Post
Yep was thinking of this one when I open the thread...

Ever consider a rent-a-ride?
JrRifleCoach is offline   Reply With Quote
Old 09-14-2017, 01:10 PM   #36
cuisinartvette
CF Senior Member
 
Member Since: Oct 2004
Location: Valencia Ca.
Posts: 62,472
Thanked 609 Times in 561 Posts
Default

Great idea actually throwing someone a bill for a ride is a lot cheaper than building it just "to see".
That guy cant even get into the throttle til 4th
cuisinartvette is online now   Reply With Quote
Old 09-14-2017, 01:43 PM   #37
rklessdriver
CF Senior Member
 
rklessdriver's Avatar
 
Member Since: Apr 2005
Location: Dale City VA
Posts: 3,134
Thanked 101 Times in 90 Posts
Default

Quote:
Originally Posted by pologreen1 View Post
Are you in D or OD? if in the 1/4 I assume D right? If you go top speed running you'll change rear and stay in D right?

I just want to make sure we are on the same page.

My car has 26" tires, 3.45gear.

http://www.angelfire.com/fl/procrastination/rear.html
It's gonna be really tough to compare your car to my 84.

My 84 has a 2 speed Powerglide transmission and 3.89 rear gear on 275/60R15 radial tires (28" tall). On nitrous the engine makes over 1,000HP and will turn 8,200 RPM safely.....

To run 165 mph in the 1/4 the engine turned right at 8,000 RPM, verified according to the data log from that pass.

IF you do the calculator it shows 8K RPM should be 171MPH..... So my 84 lost about 5-6 MPH with the TQ converter slippage (about 4%)... which BTW is actually very good for a racing TQ converter, but I didn't factor in tire growth (because I don't really know how much to factor).... but tires do grow with RPM/speed so my converter slippage is actually a bit higher, some of it is just offset by the tire growth.

Now a 2 speed Powerglide (in high gear) is 1.00 ratio. So it'd be like your 4L60 trans in 3rd or DRIVE.... However with your trans you have a lock up TQ converter, so you have the ability to lock the TQ Converter up and reduced slippage to near 0%, which I can not do.

You would need a lot more RPM capability than your engine has to run 200MPH with your trans in Drive 3rd gear because that would require
about 9,000 RPM.

At 6300RPM in OD 4th gear you could break 200 MPH but just from experience, it would take an impossible amount of HP and TQ to pull that kind of gearing and aero drag at such a low RPM.

Gearing and power band are why C4 Corvettes usually top out in the high 150 to 160MPH range.

Will
rklessdriver is offline   Reply With Quote
Old 09-14-2017, 01:58 PM   #38
rklessdriver
CF Senior Member
 
rklessdriver's Avatar
 
Member Since: Apr 2005
Location: Dale City VA
Posts: 3,134
Thanked 101 Times in 90 Posts
Default

Quote:
Originally Posted by JrRifleCoach View Post
Yep was thinking of this one when I open the thread...

Ever consider a rent-a-ride?
That car and engine is flat out awesome.

400 inches SB 2.2 cyl heads... almost 900HP Naturally Aspirated. Plus it has a bunch of RPM capability.

Really well thought out combo for these type of top speed events.

Back in the Maxton Mile days, I saw many former NASCAR cars there break or come close to 200 MPH.

Greg Davidson brought a short track car to the TX Mile with a Procharged SBC and went over 240MPH.... back in 2011.

Will
rklessdriver is offline   Reply With Quote
Old 09-14-2017, 02:28 PM   #39
Jeffwilson34
CF Senior Member
 
Jeffwilson34's Avatar
 
Member Since: Oct 2007
Location: Morristown TN
Posts: 1,010
Thanked 1 Time in 1 Post
Default

I had 2 86's 1 was made early run and the other was a later and had updated heads.
I got the early one up to 140 and the later over 150
I had a 98C5 that I got up to a bit over 190 I also have a nice pink certificate from the local PD that says it will go 177 (cost me over $3000)
I have a video of it hitting 150MPH when it hit 300,000 miles
I now have a 96 LT1 I was able to get 160 out of pretty easily. brought a smile to my face and a surprised look from the over of the 2017 GT mustang
Jeffwilson34 is offline   Reply With Quote
Old 09-14-2017, 04:15 PM   #40
pologreen1
CF Senior Member
Thread Starter
 
pologreen1's Avatar
 
Member Since: Dec 2007
Posts: 14,671
Thanked 94 Times in 92 Posts
Default

Quote:
Originally Posted by rklessdriver View Post
It's gonna be really tough to compare your car to my 84.

My 84 has a 2 speed Powerglide transmission and 3.89 rear gear on 275/60R15 radial tires (28" tall). On nitrous the engine makes over 1,000HP and will turn 8,200 RPM safely.....

To run 165 mph in the 1/4 the engine turned right at 8,000 RPM, verified according to the data log from that pass.

IF you do the calculator it shows 8K RPM should be 171MPH..... So my 84 lost about 5-6 MPH with the TQ converter slippage (about 4%)... which BTW is actually very good for a racing TQ converter, but I didn't factor in tire growth (because I don't really know how much to factor).... but tires do grow with RPM/speed so my converter slippage is actually a bit higher, some of it is just offset by the tire growth.

Now a 2 speed Powerglide (in high gear) is 1.00 ratio. So it'd be like your 4L60 trans in 3rd or DRIVE.... However with your trans you have a lock up TQ converter, so you have the ability to lock the TQ Converter up and reduced slippage to near 0%, which I can not do.

You would need a lot more RPM capability than your engine has to run 200MPH with your trans in Drive 3rd gear because that would require
about 9,000 RPM.

At 6300RPM in OD 4th gear you could break 200 MPH but just from experience, it would take an impossible amount of HP and TQ to pull that kind of gearing and aero drag at such a low RPM.

Gearing and power band are why C4 Corvettes usually top out in the high 150 to 160MPH range.

Will
Thanks, that is what I was looking for the RPM you are able to pull. Mostly what trans you have now. I think I can spin like 7200, but that is maxed out and really the cam is only rated for 6800 a little street cam.

i was think OD will blow up really.
pologreen1 is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Who had their c4 go 200MPH ?
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    C5 insurance for teen. mfitz1 C5 General 19 09-14-2017 10:01 AM
    Anyone pass 200mph yet? 3L337 C6 C7 Z06 Discussion 37 09-02-2017 11:15 PM
    Speedo cable 90 adapter Sunset Orng 05 C3 Tech/Performance 15 12-01-2016 05:50 PM
    200 shot stock bottom? Stroker87 C5 Forced Induction/Nitrous 2 09-24-2016 02:49 PM
    200R4 speedometer cable ?? V6DVette C1 & C2 Corvettes 7 01-11-2016 11:58 AM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 07:13 PM.


     
    • Ask a Question
      Get answers from community experts
    Question Title:
    Description:
    Your question will be posted in: