What mph should I shift at?
04-05-2012, 09:11 PM
#1
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Car: 87 Camaro Lt
Engine: 350
Transmission: 700R4
Axle/Gears: 4th gen 3:42, posi, disc
What mph should I shift at?
700r4
10 bolt from 87 v6 with stock gears...3.23 or 3.27?
bone stock lg4 305.
225/65/15 tires
My car has no tach and the transmission refuses to ride through the gears during wot. For some reason it jumps into overdrive extremely early and just skips third completely. So When racing I manually run through the gears. Question is at what mph should I shift for each gear?
10 bolt from 87 v6 with stock gears...3.23 or 3.27?
bone stock lg4 305.
225/65/15 tires
My car has no tach and the transmission refuses to ride through the gears during wot. For some reason it jumps into overdrive extremely early and just skips third completely. So When racing I manually run through the gears. Question is at what mph should I shift for each gear?
04-05-2012, 09:18 PM
#2
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: What mph should I shift at?
At roughly the peak HP RPM... or looked at another way, at the RPM where the engine changes to the peak torque RPM after the shift.
04-05-2012, 10:43 PM
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Car: 87 Camaro Lt
Engine: 350
Transmission: 700R4
Axle/Gears: 4th gen 3:42, posi, disc
Re: What mph should I shift at?
I have no tachometer. The speedometer is the only thing I have to gauge what rpm im at. What mph does your car shift at for each gear under full throttle is what I'm asking.
04-05-2012, 10:50 PM
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73
Re: What mph should I shift at?
Listen to the cars rpms would work lol... Mine does around 15, mid 20s, 35-40, and so on...at least for me..
04-06-2012, 02:52 AM
#5
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Car: 87 Camaro Lt
Engine: 350
Transmission: 700R4
Axle/Gears: 4th gen 3:42, posi, disc
Re: What mph should I shift at?
That sounds about right for daily driving, but im talking about racing and running each gear to about 5k rpms. Like I said I can't really listen to in when its just in overdrive because it skips the gears so I have to do it manually. When you floor it what mph does it usually shift at in each gear?
04-06-2012, 08:21 AM
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73
Re: What mph should I shift at?
I'll let you know later today after I drive it. Unless someone else comes up with a precise answer
04-06-2012, 03:18 PM
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Car: 87 Camaro Lt
Engine: 350
Transmission: 700R4
Axle/Gears: 4th gen 3:42, posi, disc
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04-06-2012, 03:41 PM
#8
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Re: What mph should I shift at?
An 87 V6 should have 3.42 gears.
With 3.42 gears and your tires and a 5000 redline my sim gives optimum shift points at
39 mph @ 5000 rpm
69 mph @ 4600 rpm
103 mph @ 4600 RPM
What are you racing with a 17 second car?
If you want to know what speed is 5k rpms in each gear go look up a gear ratio calculator with speed in gears.
https://www.thirdgen.org/gears
With 3.42 gears and your tires and a 5000 redline my sim gives optimum shift points at
39 mph @ 5000 rpm
69 mph @ 4600 rpm
103 mph @ 4600 RPM
What are you racing with a 17 second car?
If you want to know what speed is 5k rpms in each gear go look up a gear ratio calculator with speed in gears.
https://www.thirdgen.org/gears
Last edited by midias; 04-06-2012 at 03:44 PM.
04-06-2012, 03:53 PM
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Car: 1991 RS
Engine: 5.0
Transmission: 700r4
Re: What mph should I shift at?
[QUOTE=midias;5235213]
What are you racing with a 17 second car?
[QUOTE]
Hondas, school buses, old ladies on rascals.
What are you racing with a 17 second car?
[QUOTE]
Hondas, school buses, old ladies on rascals.
04-06-2012, 03:55 PM
#10
Supreme Member
Re: What mph should I shift at?
[QUOTE=RS Chris;5235223][QUOTE=midias;5235213]
What are you racing with a 17 second car?
Hondas, school buses, old ladies on rascals. You could keep it floored and old ladies in Buicks would still pass you on any freeway on ramp.
What are you racing with a 17 second car?
Hondas, school buses, old ladies on rascals.
04-07-2012, 11:52 AM
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73
Re: What mph should I shift at?
i didnt even realize you were driving a 6..sorry, i cant really help then :/
04-07-2012, 12:23 PM
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: What mph should I shift at?
bone stock lg4 305
10 bolt from 87 v6
No sense trying to wind that up to 5000 RPM; it'll run about 3 seconds quicker if you shift it at a more sensible rev down somewhere nearer the peak HP RPM, around 4200.
Fix the tach. Make sure it's accurate. Shift by RPM not mph.
04-07-2012, 04:33 PM
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Car: 87 Camaro Lt
Engine: 350
Transmission: 700R4
Axle/Gears: 4th gen 3:42, posi, disc
Re: What mph should I shift at?
Lol, not a v6! I still imagine it to be roughly a 17 second car though. I just want to track it now while its stock so I can get before and after times with parts as I upgrade. There is no tach to fix, this is a rs with a 305 swapped in.
Thanks for the numbers though, those were exactly what I was looking for
Thanks for the numbers though, those were exactly what I was looking for
04-07-2012, 08:10 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: What mph should I shift at?
700r4
10 bolt from 87 v6 with stock gears...3.23 or 3.27?
bone stock lg4 305.
225/65/15 tires
My car has no tach and the transmission refuses to ride through the gears during wot. For some reason it jumps into overdrive extremely early and just skips third completely. So When racing I manually run through the gears. Question is at what mph should I shift for each gear?
10 bolt from 87 v6 with stock gears...3.23 or 3.27?
bone stock lg4 305.
225/65/15 tires
My car has no tach and the transmission refuses to ride through the gears during wot. For some reason it jumps into overdrive extremely early and just skips third completely. So When racing I manually run through the gears. Question is at what mph should I shift for each gear?
04-08-2012, 09:27 AM
#16
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: What mph should I shift at?
Lol, not a v6! I still imagine it to be roughly a 17 second car though. I just want to track it now while its stock so I can get before and after times with parts as I upgrade. There is no tach to fix, this is a rs with a 305 swapped in.
Thanks for the numbers though, those were exactly what I was looking for
Thanks for the numbers though, those were exactly what I was looking for
Before posting such things, you should really do some reading. We like hard to answer questions with lots of technical background.
This type of question is like "how do you eat with a spoon?".
-- Joe
04-08-2012, 09:41 AM
#17
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Re: What mph should I shift at?
^ i don't think he even had a tach to begin with he would probably need a new cluster right?
04-08-2012, 10:32 AM
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Car: GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: Aussie 9-bolt/3.27 posi
Re: What mph should I shift at?
Step 1. get tranny fixed (if it won't upshift at WOT then something is "broke" possibly just a vacuum line/piece or cable to TB)
Step 2. Install gauge cluster with tach (or aftermarket tack like an Autometer 5" but that might look funny with the stock cluster)
Step 2. Install gauge cluster with tach (or aftermarket tack like an Autometer 5" but that might look funny with the stock cluster)
04-08-2012, 01:27 PM
#19
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: What mph should I shift at?
Either way, he can swap a tach or a full cluster. Simple fix. Enough of these cars in the junkyard and people parting them.
-- Joe
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