How fast can your LT4 go?
Le Mans Master
Joined: Apr 2002
Posts: 7,281
Likes: 5
From: Boston
Re: How fast can your LT4 go? (Bluewasp)
I've done several top speed runs but I always done it with other guys so we get a 'beatch" to go ahead a scout for cops then call us for the "clear" and we just put the hammer down and hope nothing goes wrong.
BTW we do it at around 0300am no traffic and few cops. This is just outside of Portland and we have about a 4.5 mile strech of road to do it, but the first 1.5 is enough.
Later :cheers:
BTW we do it at around 0300am no traffic and few cops. This is just outside of Portland and we have about a 4.5 mile strech of road to do it, but the first 1.5 is enough.
Later :cheers:
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Re: How fast can your LT4 go? (blk95)
One guy that has a LT1 in Germany says he hit 171mph with an automatic.
I think with a long enough stretch 170 can be done maybe more with an LT4...
I think with a long enough stretch 170 can be done maybe more with an LT4...
Top speed is horsepower-related. Just because you can hit 135 in fourth doesn't mean you can hit 170 in sixth...an LT4 (never mind an LT1) doesn't make the power necessary to pull sixth to redline. This has been demonstrated and reported in earlier posts.
The LT4 runs out of power in fifth! Otherwise, it would pull 6300 in fifth. The numbers tell me that a slight change in the 3:45 rear gear to, say a 3:60 or so, MIGHT let the LT4 rev to redline (in 5th). You may even pick up 2 or 3 MPH that way. It would take a STOUT stock LT4 (and normal manufacturing variances just might provide said engine in some of the forum member's Corvettes!) to pull past 170mph in fifth.
I may have one of those.
But I'll never know... :nonod:
Larry
code5coupe
:seeya
Le Mans Master
Joined: Aug 1999
Posts: 7,339
Likes: 137
From: WilkesBarre PA
Re: How fast can your LT4 go? (rocco16)
I hit 145 for the backstretch at Pocono but was late breaking going into the tunnel turn and had to take turn#1 at about 100 going into the straightaway in 4th.
Racer
Joined: Aug 2002
Posts: 363
Likes: 0
From: Toronto Ont
Re: How fast can your LT4 go? (rocco16)
Went to my mothers house in my old room and found old 1994 Aug. of Motor Trend Issues. There was one article on the best bang for the buck and had a whole bunch of cars and what do you know a copper colour vette was one of them.
Heres the #'s
6sp LT1
0-60 5.6
1/4 14.0/102
60-0braking 115
slalom mph 68.3
Lateral accel .92
Top speed 170.0
Car and driver posted 162 and 167 for the LT4.
Who know's if 170 can be attainable for LT4.
[Modified by blk95, 10:42 PM 9/15/2003]
[Modified by blk95, 4:15 AM 9/16/2003]
Heres the #'s
6sp LT1
0-60 5.6
1/4 14.0/102
60-0braking 115
slalom mph 68.3
Lateral accel .92
Top speed 170.0
Car and driver posted 162 and 167 for the LT4.
Who know's if 170 can be attainable for LT4.
[Modified by blk95, 10:42 PM 9/15/2003]
[Modified by blk95, 4:15 AM 9/16/2003]
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: How fast can your LT4 go? (blk95)
This topic comes up from time to time....but I enjoy the replies...wonder where the one about "that is completely irresponsible!" is...:)
170 MPH in stock LT4 is totally achievable-I know it.
Most believe a good running stock LT4 will do 175. Now that is flat ground with no wind.
Lightly modified...who knows...just speculation...
Turning a corner while accelerating is not the same as straightline accel...you won't hit topspeed on a track unless it is TRC or some other 20 mile oval.
Now has anyone seen the Mclaren F1 video of the fella hitting 240 MPH? Very, very impressive...guess that is what 640 HP will do...
170 MPH in stock LT4 is totally achievable-I know it.
Most believe a good running stock LT4 will do 175. Now that is flat ground with no wind.
Lightly modified...who knows...just speculation...
Turning a corner while accelerating is not the same as straightline accel...you won't hit topspeed on a track unless it is TRC or some other 20 mile oval.
Now has anyone seen the Mclaren F1 video of the fella hitting 240 MPH? Very, very impressive...guess that is what 640 HP will do...
Burning Brakes
Joined: Aug 2001
Posts: 1,196
Likes: 0
Re: How fast can your LT4 go? (larryfs)
there is nothing wrong with my car. It runs perfectly fine.
I have no idea how long the back straight is at pocono.
It pulls hard all the way to redline in 4th gear.
once you shift to 5th. it loses 2 miles and hour, then slowly starts climbing back up.
The amount of road you use to reach 150, must be twice as long as pocono, and I wont do that on the street or any public road. It's rather stupid... and I'm not 18 anymore. common sense prevails :smash:
I have no idea how long the back straight is at pocono.
It pulls hard all the way to redline in 4th gear.
once you shift to 5th. it loses 2 miles and hour, then slowly starts climbing back up.
The amount of road you use to reach 150, must be twice as long as pocono, and I wont do that on the street or any public road. It's rather stupid... and I'm not 18 anymore. common sense prevails :smash:
I agree with everyone else my LT4 keeps right on pulling hard above 135, had it up to 140 in 5th at Bowling Green this weekend and it was still pulling like a frieght train. I'd get yours looked at doesn't sound right to me, I don't loose any MPH when I goto 5th :nono:
[Modified by MongooseLT4, 9:32 PM 9/15/2003]
Melting Slicks
Joined: Dec 2001
Posts: 2,049
Likes: 0
From: Texas
Re: How fast can your LT4 go? (MongooseLT4)
Fastest I've gone in my LT1 is about 150... did it have more? YES!! I think I could EASILY hit 170. My '97 T/A pulled hard all the way to 175 when I slammed on the brakes coming up to a border patrol station in the middle of nowhere :leaving: Don't see any reason my Vette should be slower than that. :cheers:
I have 3.07 gears right now, auto tranny.
[Modified by BowTieBlood, 8:37 PM 9/15/2003]
I have 3.07 gears right now, auto tranny.
[Modified by BowTieBlood, 8:37 PM 9/15/2003]
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Drifting
Joined: Dec 2001
Posts: 1,313
Likes: 1
From: providence ut
Re: How fast can your LT4 go? (MongooseLT4)
a road I 80 leading to nevada in utah accross the bonneville salt flats is stright as an arrow for 45 miles and light traffic.....I raced another vette ...a lt1...with my supercharged l98 from 70 mph to 156 mph..........my speedo read 151 mph ...his read 156 mph when we shut down for traffic ahead........we both used his reading because its better for bragging rights..............which is right we both use factory size tires, some times I wonder if the guys bragging higher than normal speeds have incorrect tire sizes or incorrect speedometers. :cheers:
Melting Slicks
Joined: Dec 2001
Posts: 2,049
Likes: 0
From: Texas
Re: How fast can your LT4 go? (MongooseLT4)
Whats mods were on the TA? My 96Z28 only hit 155 flat out 6 speed
I ran with my friend's Dodge R/T (slightly modified) at 110 after just to make sure our speedos matched up. Sure enough they did. The thing was pulling hard the entire way to 170. I'd say it shifted (I'm guessing into over-drive) at around 135-140, but it's been a year or two.
The guys in the R/T were going 85 when we passed them, said it seemed like they were standing on the side of the road :lol: I have a video somewhere, I'll see if I can find it. :cheers:
BTW, the roads to and from South Padre are LONG and STRAIGHT and FLAT!
[Modified by BowTieBlood, 9:21 PM 9/15/2003]
[Modified by BowTieBlood, 9:22 PM 9/15/2003]
Le Mans Master
Joined: Aug 2000
Posts: 7,760
Likes: 0
From: Lost in the mountains of TN
Re: How fast can your LT4 go? (GlockLT4)
Does the ZR1 also reach it's top speed in 5th? If the LT4 does 168 @5800 rpm in 5th gear, I guess the 700 or so extra rpms combined with the extra power would reach the neighborhood of 180 mph. Or does it top out in 6th gear? I know that this isn't the ZR1 section, but I was wondering if LT5 power levels would propel my car to 180 with existing tranny & rear.
There are 3 dyno trips on this graph all done in 4th gear of course. Blue (pulled to 6800RPM) was after I added headers. Red (pulled to 6900RPM) added flowmaster exhaust. And green (pulled to 7200RPM rev limit) added an Intake port job. I could have pulled the red and blue one longer. But my tach is a bit off. It showed an indicated 7100 RPM inside so I shut it down. On the third trip I just let it hit the limiter. But you can see the increase in speed. And how much more power it takes to get there. I have taken my car to 175. Lets just say there was still more in it. But it was also a religious experience. :blueangel:
Melting Slicks
Joined: Dec 2001
Posts: 2,049
Likes: 0
From: Texas
Re: How fast can your LT4 go? (BiZ)
Does the ZR1 also reach it's top speed in 5th? If the LT4 does 168 @5800 rpm in 5th gear, I guess the 700 or so extra rpms combined with the extra power would reach the neighborhood of 180 mph. Or does it top out in 6th gear? I know that this isn't the ZR1 section, but I was wondering if LT5 power levels would propel my car to 180 with existing tranny & rear.
Yes it does. And yes more power will make you go faster. And since I was bored sitting here I decided to play with the dynojet runviewer. The mph readings I got from the graph are within 2 mph of indicated speedo reading. If my memory serves the speedo read higher than what this graph reads.
There are 3 dyno trips on this graph all done in 4th gear of course. Blue (pulled to 6800RPM) was after I added headers. Red (pulled to 6900RPM) added flowmaster exhaust. And green (pulled to 7200RPM rev limit) added an Intake port job. I could have pulled the red and blue one longer. But my tach is a bit off. It showed an indicated 7100 RPM inside so I shut it down. On the third trip I just let it hit the limiter. But you can see the increase in speed. And how much more power it takes to get there. I have taken my car to 175. Lets just say there was still more in it. But it was also a religious experience. :blueangel:
Yes it does. And yes more power will make you go faster. And since I was bored sitting here I decided to play with the dynojet runviewer. The mph readings I got from the graph are within 2 mph of indicated speedo reading. If my memory serves the speedo read higher than what this graph reads.
There are 3 dyno trips on this graph all done in 4th gear of course. Blue (pulled to 6800RPM) was after I added headers. Red (pulled to 6900RPM) added flowmaster exhaust. And green (pulled to 7200RPM rev limit) added an Intake port job. I could have pulled the red and blue one longer. But my tach is a bit off. It showed an indicated 7100 RPM inside so I shut it down. On the third trip I just let it hit the limiter. But you can see the increase in speed. And how much more power it takes to get there. I have taken my car to 175. Lets just say there was still more in it. But it was also a religious experience. :blueangel:
Race Director
Joined: Oct 2001
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From: Canton GA
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Re: How fast can your LT4 go? (BowTieBlood)
I bet you'd get to 200 if you had a long enough road!!!
If I remember correctly, someone tried a top speed run in a Z with 4:33 gears. The premise behind it was to be able to pull in 6th... and it did, but only to about 187ish. Wind resistance multiplies exponentionaly so it would take a hellova lot more power to break 200.
