For those of you with 3 speeds...
05-19-2004, 01:14 PM
#1
Instructor
Thread Starter
Member Since: May 2004
Location: Baton Rouge LA
Posts: 247
Likes: 0
Received 0 Likes
on
0 Posts
For those of you with 3 speeds...
When you're running 60 mph, what are taching? The vette I just picked up is up around 2500rpm at 60mph. Just wondering if this is exceptionally high. Wondering if this car is geared real low. I don't know the ratio.
05-19-2004, 01:51 PM
#2
Racer
Member Since: Dec 2002
Location: Spartanburg SC
Posts: 400
Likes: 0
Received 0 Likes
on
0 Posts
Re: For those of you with 3 speeds... (Custum73)
Hmm I guess mine is around 3500 rpm at 60 mph, but I believe my tach is really messed up, at least I hope so!! From what I've seen 2500 doesn't seem to bad at 60, but I could be wrong.
05-19-2004, 02:04 PM
#4
Race Director
Member Since: May 2003
Location: Science Bitch! Mississauga, Ontario
Posts: 11,814
Likes: 0
Received 7 Likes
on
7 Posts
Canadian Events Coordinator
Re: For those of you with 3 speeds... (stingraymaniac)
mine is at 2000-2200 rpm at 55-60 but i have a 4speed manual
05-19-2004, 02:05 PM
#5
Safety Car
Re: For those of you with 3 speeds... (Custum73)
By three-speed I assume you mean automatic since the manual was discontinued in '69. If your tires are close to stock diameter then that comes out to a 3.08 rear. But without knowing the tire, it's impossible to say absolutely.
05-19-2004, 02:09 PM
#6
Race Director
Member Since: Nov 1999
Location: Foxfield CO 1970 Convertible
Posts: 10,642
Likes: 0
Received 5 Likes
on
4 Posts
Re: For those of you with 3 speeds... (AGVI)
mine is at 2000-2200 rpm at 55-60 but i have a 4speed manual
:skep: right, so you responded because....?
:skep: right, so you responded because....?
IMO, 2500rpm would put the car at about 120 at 5000rpm, which is about right for top speed... :yesnod:
05-19-2004, 02:17 PM
#7
Melting Slicks
Re: For those of you with 3 speeds... (Z-man)
Actually no, they can't be directly compared. Auto's have some slip in the convertor.
I run 3400 at 80mph, with what should be a 3.08 rear. Your numbers sound close, but I don't drive those speeds very often so I can't be sure.
-Chris
I run 3400 at 80mph, with what should be a 3.08 rear. Your numbers sound close, but I don't drive those speeds very often so I can't be sure.
-Chris
05-19-2004, 02:59 PM
#8
Le Mans Master
Re: For those of you with 3 speeds... (Z-man)
mine is at 2000-2200 rpm at 55-60 but i have a 4speed manual
:skep: right, so you responded because....?
Probably because at 60 mph he assumed that the car was in top gear. In top gear (with original transmissions) the ratio is 1:1 regardless of whether the tranny is 3 or 4 speed, so all Vettes could be compared.
IMO, 2500rpm would put the car at about 120 at 5000rpm, which is about right for top speed... :yesnod:
:skep: right, so you responded because....?
Probably because at 60 mph he assumed that the car was in top gear. In top gear (with original transmissions) the ratio is 1:1 regardless of whether the tranny is 3 or 4 speed, so all Vettes could be compared.
IMO, 2500rpm would put the car at about 120 at 5000rpm, which is about right for top speed... :yesnod:
sorry if i didnt wrote more specific what i ment :smash:
05-19-2004, 03:55 PM
#9
Le Mans Master
Member Since: Mar 2002
Location: Coming home from Luckenbach Texas
Posts: 7,456
Likes: 0
Received 2 Likes
on
2 Posts
Re: For those of you with 3 speeds... (Custum73)
Not exceptionally high. You're just not used to it because modern vehicles have overdrive transmissions...something GM didn't start installing in Vettes until 1982. Be thankful you don't have a 3.55 rear end, or you'd already be shopping for an OD tranny to swap in there (ask me how I know...)
:seeya
:seeya
05-19-2004, 04:32 PM
#10
Drifting
Member Since: Jan 2002
Location: N.Y
Posts: 1,500
Likes: 0
Received 0 Likes
on
0 Posts
Re: For those of you with 3 speeds... (stingraymaniac)
mine is at 2000-2200 rpm at 55-60 but i have a 4speed manual
:skep: right, so you responded because....?
Probably because at 60 mph he assumed that the car was in top gear. In top gear (with original transmissions) the ratio is 1:1 regardless of whether the tranny is 3 or 4 speed, so all Vettes could be compared.
IMO, 2500rpm would put the car at about 120 at 5000rpm, which is about right for top speed... :yesnod:
Yes that is why i responded!
sorry if i didnt wrote more specific what i ment :smash:
:skep: right, so you responded because....?
Probably because at 60 mph he assumed that the car was in top gear. In top gear (with original transmissions) the ratio is 1:1 regardless of whether the tranny is 3 or 4 speed, so all Vettes could be compared.
IMO, 2500rpm would put the car at about 120 at 5000rpm, which is about right for top speed... :yesnod:
Yes that is why i responded!
sorry if i didnt wrote more specific what i ment :smash:
05-19-2004, 04:36 PM
#11
Safety Car
Re: For those of you with 3 speeds... (Custum73)
I tach about the same at 60; '78 Pace Car. I am so used to today's ovedrive trannys that it always sound strange to wind that high.
05-19-2004, 05:56 PM
#12
Race Director
Member Since: May 2003
Location: Science Bitch! Mississauga, Ontario
Posts: 11,814
Likes: 0
Received 7 Likes
on
7 Posts
Canadian Events Coordinator
Re: For those of you with 3 speeds... (stingraymaniac)
mine is at 2000-2200 rpm at 55-60 but i have a 4speed manual
:skep: right, so you responded because....?
Probably because at 60 mph he assumed that the car was in top gear. In top gear (with original transmissions) the ratio is 1:1 regardless of whether the tranny is 3 or 4 speed, so all Vettes could be compared.
IMO, 2500rpm would put the car at about 120 at 5000rpm, which is about right for top speed... :yesnod:
Yes that is why i responded!
sorry if i didnt wrote more specific what i ment :smash:
:skep: right, so you responded because....?
Probably because at 60 mph he assumed that the car was in top gear. In top gear (with original transmissions) the ratio is 1:1 regardless of whether the tranny is 3 or 4 speed, so all Vettes could be compared.
IMO, 2500rpm would put the car at about 120 at 5000rpm, which is about right for top speed... :yesnod:
Yes that is why i responded!
sorry if i didnt wrote more specific what i ment :smash:
05-19-2004, 08:16 PM
#13
Intermediate
Member Since: May 2004
Location: Houston TX
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
Re: For those of you with 3 speeds... (AGVI)
about 2500 on my 74' 3 speed auto, as well. :)
I drive it with pretty good care, and that's about typical cruising speed around the freeways.
My Fiero tachs at about the same RPM for 60MPH. That's how I remembered. :)
I drive it with pretty good care, and that's about typical cruising speed around the freeways.
My Fiero tachs at about the same RPM for 60MPH. That's how I remembered. :)
05-20-2004, 01:11 AM
#14
Race Director
Member Since: Nov 1999
Location: Foxfield CO 1970 Convertible
Posts: 10,642
Likes: 0
Received 5 Likes
on
4 Posts
Re: For those of you with 3 speeds... (Wamplet)
The Chevy small blocks were happier than most at high revs. I remember in the '70s I'd cruise all day at 75 - 85 (before the double nickel) and that engine would just sing along at 3 - 4 grand. Hey, gas was 35 cents a gallon and you could fill up for 5 bucks! :cool:
05-20-2004, 09:38 AM
#15
Racer
Member Since: Jan 2004
Location: Thomasville Ga
Posts: 292
Likes: 0
Received 0 Likes
on
0 Posts
Re: For those of you with 3 speeds... (Z-man)
With my 71 with a 3.08, mine runs right at 2400-2500 at 60 :)
when I first got in though, I thought it was stuck in 2nd! :lol:
The ease at which new OD trannys get you down the road really is nice and habit forming. :auto:
when I first got in though, I thought it was stuck in 2nd! :lol:
The ease at which new OD trannys get you down the road really is nice and habit forming. :auto:
