4l70e to powerglid and gear vendor od
Feb 14, 2007 | 02:17 AM
#11
TECH Veteran
Joined: Mar 2004
Posts: 4,632
Likes: 2
From: Sun Diego
Originally Posted by NORCAL TBSS
i see this on tons of ls1 maros. people drop ets also because the glide is much more efficent. powerglide with 3000 stall and transbrake and gv od is what im looking to do on my trailblazer ss.
So has anyone done this because this seems like the way to go.
So has anyone done this because this seems like the way to go.
Feb 14, 2007 | 03:33 PM
#13
Originally Posted by James B.
Try a few launches with your truck in second to see if you'd like that gear ratio. For cruising, the Powerglide and a GV would give you the same final output ratio as a TH400 and a GV - 0.78:1 since it's 1:1 overdriven 22% by the GV for both setups.
It's not practical to engage the GV in the middle of an upshift sequence - it's not modulated so it engages full-strength every time. Also, it does not disengage when the transmission shifts. Low and Direct on the Powerglide are so close together that there really wouldn't be any advantage to using the GV between them. Since you have to manually disengage the GV, an upshift sequence would look like this:
1st -> (engage OD) -> 1st/over -> 2nd/over -> (disengage OD) -> 2nd -> (engage OD) -> 2nd/over.
I use it only for overdriving overdrive, in other words, double-overdrive, and only over 60MPH. It's great for cruising down the highway but not practical for normal city driving.
It's not practical to engage the GV in the middle of an upshift sequence - it's not modulated so it engages full-strength every time. Also, it does not disengage when the transmission shifts. Low and Direct on the Powerglide are so close together that there really wouldn't be any advantage to using the GV between them. Since you have to manually disengage the GV, an upshift sequence would look like this:
1st -> (engage OD) -> 1st/over -> 2nd/over -> (disengage OD) -> 2nd -> (engage OD) -> 2nd/over.
I use it only for overdriving overdrive, in other words, double-overdrive, and only over 60MPH. It's great for cruising down the highway but not practical for normal city driving.
James im not saying your wrong... and i dont know alot about these GVs...
watch this video..
2004 GTO With STS Turbo & Gear Vendors 8 Speed conversion
http://youtube.com/watch?v=cqcatdNlBWs
The GV shifting doesnt look like its smooth at all.
I dont know how they got it to do that... but its cool....
IS this the GV your talking about?
Feb 14, 2007 | 06:09 PM
#14
TECH Addict
Joined: Oct 2002
Posts: 2,544
Likes: 0
From: Mefis
Do you have the power to make that heavy pig launch with a 1.82 or 1.76 first gear?
Wouldn't that be a four speed?
You can go first, first over, second, second over.
Originally Posted by moregrip
the GV would make it a 3spd
You can go first, first over, second, second over.
Feb 14, 2007 | 06:15 PM
#15
Originally Posted by Keith
Wouldn't that be a four speed?
You can go first, first over, second, second over.
You can go first, first over, second, second over.
you would have to:
A. Start out in 1st gear
B. shift GV to 1st over
C. Time the disengagement of the GV unit with and transmission up shift to 2nd perfectly
D. Re-engage GV to 2nd over
unless there are electronics available that will time everything correctly, in execution, it's more like a 3spd in the way we think an up shift should be
Feb 14, 2007 | 09:20 PM
#16
The fully-automatic controller only works with four-speed fully electronic transmissions. Being that a Powerglide is being considered, use of this controller isn't possible anyway.
Even if it were a 4-speed electronic trans, the fully-automatic controller only disengages the Gear vendors OD after the 4-speed trans has upshifted. The controller does not attempt to time it perfectly - this could be catastrophic if the Gear Vendors OD were to disengage before the transmission upshifted - that would send rod(s) through the side(s) of the block! The end result, if upshifted properly trough all gears overdriven, is not what you'd expect. You can see this on the video too. The trans upshifts and the the GV disengages. It's like a full upshift and then half a downshift. I doubt that's what you really want. Even though it is possible to split every gear, it's impractical. Too much effort and to much RPM change violence!
I have owned and driven a Gear Vendors overdrive for years. It has seen two engines, three transmissions, three driveshafts, and three rear ends in the same truck. Take or or leave it, my word on this is that splitting gears in an upshift sequence is impractical and you'll ultimately end up using it only to overdrive the highest ratio in your transmission.
Even if it were a 4-speed electronic trans, the fully-automatic controller only disengages the Gear vendors OD after the 4-speed trans has upshifted. The controller does not attempt to time it perfectly - this could be catastrophic if the Gear Vendors OD were to disengage before the transmission upshifted - that would send rod(s) through the side(s) of the block! The end result, if upshifted properly trough all gears overdriven, is not what you'd expect. You can see this on the video too. The trans upshifts and the the GV disengages. It's like a full upshift and then half a downshift. I doubt that's what you really want. Even though it is possible to split every gear, it's impractical. Too much effort and to much RPM change violence!
I have owned and driven a Gear Vendors overdrive for years. It has seen two engines, three transmissions, three driveshafts, and three rear ends in the same truck. Take or or leave it, my word on this is that splitting gears in an upshift sequence is impractical and you'll ultimately end up using it only to overdrive the highest ratio in your transmission.
Thread
Thread Starter
Forum
Replies
Last Post
omc8
Central & Northern
0
Aug 10, 2015 10:39 PM
MileHighSierra
GM Drivetrain & Suspension
5
Jul 22, 2015 11:19 PM
ferrellrooster
GM Drivetrain & Suspension
6
Jul 17, 2015 07:07 AM
