Vacuum Modulation in 4L60
Vacuum Modulation in 4L60 I know that Yank, FLP, and the Speed inc trannies are all Vacuum Modulated, and they seem to work well. Has anyone converted a stock tranny or a regular rebuild(not performance) to Vacuum Modulation, and how did it work out? How hard is it to do, does the trans have to be out of the car? Anyone have any info on this they could give me, i would really appreciate it!!! Thanx in advance
Staging Lane
Joined: Aug 2003
Posts: 59
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Re: Vacuum Modulation in 4L60 After some research I found out you can't install
a vacuum modulator on 4l60/700r4 trannies. They
only work on 4l60E transmissions and you can purchase just the kit from Speed Inc. I think it's
around $100
a vacuum modulator on 4l60/700r4 trannies. They
only work on 4l60E transmissions and you can purchase just the kit from Speed Inc. I think it's
around $100
Re: Vacuum Modulation in 4L60
After some research I found out you can't install
a vacuum modulator on 4l60/700r4 trannies. They
only work on 4l60E transmissions and you can purchase just the kit from Speed Inc. I think it's
around $100
a vacuum modulator on 4l60/700r4 trannies. They
only work on 4l60E transmissions and you can purchase just the kit from Speed Inc. I think it's
around $100
Anyone know where else to get a kit to do this? I really want to do this!
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Re: Vacuum Modulation in 4L60 I am about to buy a performance rebuild locally and the guy hasn't started converting to vacuum modulation yet. I think I am either gonna wait till he does (if mine will hold out) or get it somewhere else.
I think that once we start modding our cars, we cause the computer to wack up our line pressure. Ever since I put in my new motor, the shifts are terrible. Trying to increase the line pressure with Edit seems to be hit or miss. Maybe it is all the newfound power, but I don't think so because it was instantly worse.
I wanna convert one way or another! I have heard more than once that this is the way to go.
Anyone know what if anything you have to do to the computer when you go to vacuum modulation?
I think that once we start modding our cars, we cause the computer to wack up our line pressure. Ever since I put in my new motor, the shifts are terrible. Trying to increase the line pressure with Edit seems to be hit or miss. Maybe it is all the newfound power, but I don't think so because it was instantly worse.
I wanna convert one way or another! I have heard more than once that this is the way to go.
Anyone know what if anything you have to do to the computer when you go to vacuum modulation?
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TECH Fanatic
Joined: Feb 2002
Posts: 1,782
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From: Friendswood TX
Re: Vacuum Modulation in 4L60 sorry for my ignorance, but what’s vacuum modulated? is that where its not electronically controlled but contorolled with a vacuum likt the T400s? and what’s the difference between the 4L60 and the 4L60E? ones electronic and the other one isnt?
Re: Vacuum Modulation in 4L60 I am pretty sure you are right about both.
The way I understand it, vacuum modulated means the trans line pressure is controlled based on engine load as determined by vacuum - instead of the computer determinging what the load is.
And from what I understand the advantage is that some of our mods and tuning can throw the computer off and it does not provide the proper line pressure - sloppy shifts and burnt up trannies result!
Anyone what to jump in and clarify that?
And yes, the E is the electronic 4L60.
The way I understand it, vacuum modulated means the trans line pressure is controlled based on engine load as determined by vacuum - instead of the computer determinging what the load is.
And from what I understand the advantage is that some of our mods and tuning can throw the computer off and it does not provide the proper line pressure - sloppy shifts and burnt up trannies result!
Anyone what to jump in and clarify that?
And yes, the E is the electronic 4L60.
10 Second Club
Joined: Nov 2001
Posts: 1,724
Likes: 0
From: Fenton, MI
Re: Vacuum Modulation in 4L60
I am pretty sure you are right about both.
The way I understand it, vacuum modulated means the trans line pressure is controlled based on engine load as determined by vacuum - instead of the computer determinging what the load is.
And from what I understand the advantage is that some of our mods and tuning can throw the computer off and it does not provide the proper line pressure - sloppy shifts and burnt up trannies result!
Anyone what to jump in and clarify that?
And yes, the E is the electronic 4L60.
The way I understand it, vacuum modulated means the trans line pressure is controlled based on engine load as determined by vacuum - instead of the computer determinging what the load is.
And from what I understand the advantage is that some of our mods and tuning can throw the computer off and it does not provide the proper line pressure - sloppy shifts and burnt up trannies result!
Anyone what to jump in and clarify that?
And yes, the E is the electronic 4L60.
You can also get too low of a line pressure with the computer controlled line pressure, which will can cause the band and clutches to slip on shifts at WOT. This can be caused by the ported MAF mod in an A4. The engine will see less load because of this mod letting more air in than the PCM thinks, which will help to increase your spark advance. Problem is when the PCM senses less load, it will reduce the line pressure and and the clutches can burn on shifts.
Re: Vacuum Modulation in 4L60 As they said up above, some performance trannies come that way.
And I'm looking for a conversion if one exists, or I'll go with one already built that way.
And I'm looking for a conversion if one exists, or I'll go with one already built that way.
Re: Vacuum Modulation in 4L60 Thanx for all the replys........ so far, the only company that i can find that offers the conversion (without buying a new trans) is: http://www.pro-built.net/index.cfm?f...;productid=179
It is not expensive, the only problem is I have no clue how to install it, and am very wary of someone else installing it who is not familiar with it. My luck , they would install it wrong and void my tranny warrantee. If anyone else has any additional info, PLEASE keep posting up!!!!!!
Thanks again......
It is not expensive, the only problem is I have no clue how to install it, and am very wary of someone else installing it who is not familiar with it. My luck , they would install it wrong and void my tranny warrantee. If anyone else has any additional info, PLEASE keep posting up!!!!!!
Thanks again......
Joined: Nov 2001
Posts: 34,659
Likes: 2,588
From: Schiller Park, ILL Member: #317
Re: Vacuum Modulation in 4L60 The Vacuum kits used for Speed Inc trannies are from TransGo.
I am 95% sure that the FLP units also use the kit from TransGo, I will find out for sure in about 2 weeks when I get my new FLP Level IV installed.
I am 95% sure that the FLP units also use the kit from TransGo, I will find out for sure in about 2 weeks when I get my new FLP Level IV installed.
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Re: Vacuum Modulation in 4L60 LOL
For the LS1 guys yes this can help with screwed up tuning and lack of tuning.
I can get them all day long. I have one for a 4L80E sitting on my bench as I type.
It is a very nice crutch...but nothing more. It will help get you through TQ management.
Later
Ellis
For the LS1 guys yes this can help with screwed up tuning and lack of tuning.
I can get them all day long. I have one for a 4L80E sitting on my bench as I type.
It is a very nice crutch...but nothing more. It will help get you through TQ management.
Later
Ellis
Re: Vacuum Modulation in 4L60
It is a very nice crutch...but nothing more. It will help get you through TQ management.
I don't have torque management anymore (deleted with Edit)
- don't most people get rid of that right away? I don't understand what you're getting at there.
My tuning is very good, so maybe in my case it is just a matter of a stock tranny going south after some abuse and too much HP.
I agree with Wax - from everything I've heard, I wouldn't buy a performance tranny without vacuum modulation. If there is some better way to go, I'd love to hear what it is.
Re: Vacuum Modulation in 4L60
Thanx for all the replys........ so far, the only company that i can find that offers the conversion (without buying a new trans) is: http://www.pro-built.net/index.cfm?f...;productid=179
It is not expensive, the only problem is I have no clue how to install it, and am very wary of someone else installing it who is not familiar with it. My luck , they would install it wrong and void my tranny warrantee. If anyone else has any additional info, PLEASE keep posting up!!!!!!
Thanks again......
It is not expensive, the only problem is I have no clue how to install it, and am very wary of someone else installing it who is not familiar with it. My luck , they would install it wrong and void my tranny warrantee. If anyone else has any additional info, PLEASE keep posting up!!!!!!
Thanks again......
I'm gonna talk to the local performance rebuild place about this. He has been wanting to start providing his performance trannys with this - I'll volunteer to be his first.
I'm sure a professional rebuilder would know how to install it. And it appears that it comes with the solution to make the PCM happy too! I'm gonna call Pro-built as well and talk to them. I'll bet that it is not hard to install and I'm sure they provide instructions. I'm gonna do the Transgo shift kit that they recommend as well.