4+3 warm up??
Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,613
Likes: 0
From: Orlando FL
4+3 warm up??
my 85 is my daily driver....i just had both transmission fluids changed at a well recommended vette shop. i know that the OD doesn't work until at least 140*. so any time i take the vette out i wait till about 170* or so till i try to use it. but it seems like at ALL temp ranges, it just hates to accelerate. if i shift from 3rd OD to 4th OD at 40 mph or so, it feels like i am driving with bend shafts and unbalanced tires. the car just rattles/shivers....almost like being in too low of gear. my old 91 Z28 used to THUMP then i got on the gas, and i found out that it was a bad transmission mount....is this possible? i would have thought that this shop would have caught onto something like that.
Melting Slicks
Joined: Oct 2000
Posts: 3,426
Likes: 4
From: Heidelberg PA
Cruise-In V Veteran
Re: (scorp508)
Ok driving from 3OD to 4OD at 40mph is waaaaaaay too slow. I don't even typically use OD unless I'm over 50mph to begin with.
I only use mine on the highway. The OD is tempermental and very expensive to repair.
Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,613
Likes: 0
From: Orlando FL
Re: 4+3 warm up?? (Orlando85UCFvette)
well ok...i guess then my next question is: what RPM do u usually drive at? i usually hang at about 1100....but according to what u are telling me thats no good, cuz 40 mph in 4th OD keeps me at 1100rpm. scorp....i have read many of your posts, and i value your opinion :cheers: just a lil info about my vette....1985, stock except for a hypertech stage I chip, 64K miles...i guess the only real question is at what speed/RPM's do u shift? i basically looked in the owners manual as a reference and made slight adjustments to my driving style
Drifting
Joined: May 2002
Posts: 1,509
Likes: 3
From: Hazel Park MI
Re: 4+3 warm up?? (ld85)
The 85 owners manual states to leave the overdrive button on for everyday driving - it does not give speed or rpm references as to when to use it. I leave mine on all the time, and I get much better gas mileage with it on than off, which is what is intended. And I usually hold 2nd to 3rd till 2K, and I also skip 3rd occasionally, but hold the rpms past 2K when I do. But no matter what, if you don't hold the rpms up with overdrive on, it will bog :seeya
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
1100 is seriously low, you might as well just let the clutch out and let the thing idle around town. :) I generally drive around town in the 2000-2400 RPM area. I don't use overdrive generally unless I'm cruising on the highway or if I'm over 3000 RPM for a while and will then engage it.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: (scorp508)
You shouldn't be driving that thing at 1100 rpm.
It's BAD for the motor. When you lug the motor like that, you can cause serious piston damage, and wear out your bearings.
I only run it those rpm ranges when coasting to a stop sign.
When I 'baby' my vette around, I generally keep it between 1800 and 2600rpm.
But shifting at 3500 is fun too, and harmless to the motor.
Also, only use the overdrive in 3rd/4th gear on the highway.. above 50 mph. :steering:
It's BAD for the motor. When you lug the motor like that, you can cause serious piston damage, and wear out your bearings.
I only run it those rpm ranges when coasting to a stop sign.
When I 'baby' my vette around, I generally keep it between 1800 and 2600rpm.
But shifting at 3500 is fun too, and harmless to the motor.
Also, only use the overdrive in 3rd/4th gear on the highway.. above 50 mph. :steering:
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Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: (CentralCoaster)
But shifting at 3500 is fun too, and harmless to the motor.
Racer
Joined: Mar 2001
Posts: 269
Likes: 1
From: woodstock, Ga
Re: 4+3 warm up?? (Orlando85UCFvette)
Dont mean to jump in on you guys but I have ageneral 4/3 question, when in OD do you get a smooth non grinding 1-2 shift ? I have put synchrso and hubs in this unit and if I'm not careful I can get a 1-2 grind when In OD, have any of you experinced this, I'm starting to suspect the reverse lockout rod? and shifter wear? any have this experience, thanks. I apolologize for jumping in but we may all benefit from some info sharing thanks, Frank
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: 4+3 warm up?? (frank moran)
Dont mean to jump in on you guys but I have ageneral 4/3 question, when in OD do you get a smooth non grinding 1-2 shift ?
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: 4+3 warm up?? (Orlando85UCFvette)
I try never to use my OD :D Are you sure the TV cable is adjusted correctly? :lurk: Check C beam bolts for tightness. Check motor mounts. Driveshaft balanced? Universal joints good? Drape some garlic over the firewall!
:cheers:
[Modified by GRX, 12:20 PM 9/2/2003]
:cheers:
[Modified by GRX, 12:20 PM 9/2/2003]
Thread Starter
Drifting
Joined: Jul 2003
Posts: 1,613
Likes: 0
From: Orlando FL
Re: 4+3 warm up?? (GRX)
JUMPIN' JACK CRAP!!! :eek: was my vette always this fast?? :D on the drive home tonight i kept th OD off and held the RPM's at between 1700 and 2000....WOW...smooth and sweet :thumbs: like a whole new car. i guess my problem was that i held the owners manual to heart, but i guess those shift points are way off....far too conservative...well i must thank everyone here for their input...your knowledge has certainly made the ownership of a vette MUCH more enjoyable :) :chevy :steering: :thumbs: :yesnod: :D :cool: :cheers: :smash:
and as always....keep :seeya
and as always....keep :seeya
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: 4+3 warm up?? (Orlando85UCFvette)
I only use mine on the freeway at cruise and that's if I'm low on gas. Otherwise, I rev that small block chevy! IF your shift points are skewed, BY ALL MEANS have a mechanic check your THROTTLE VALVE cable. Very important.
