Need help explaining what a VB does to my Dad
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Master of Strokes
Joined: Mar 2007
Posts: 6,808
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From: CA
Need help explaining what a VB does to my Dad
Well I am really close now to getting the VB but my Dad ask me what it does and I am having a really hard time explaining it to him. Does any one have a better explanation than I have to help him out?
Thanks
Nick
Thanks
Nick
Posting Guru
Joined: Jan 2008
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From: Bridgewater, VA
I'll try from my understanding.
The vb with increase the life of the transmission by making shifts quicker and firmer, putting less strain on the torque converter and will also change the shift points so that they too will put less strain on the tc.
haha maybe someone else will be of better help/knowledge. I just did a shift kit
The vb with increase the life of the transmission by making shifts quicker and firmer, putting less strain on the torque converter and will also change the shift points so that they too will put less strain on the tc.
haha maybe someone else will be of better help/knowledge. I just did a shift kit
Posting Guru
Joined: Oct 2007
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From: Bloomfield Hills, MI
I think (almost positive) it increase the pressure in the lines therefore making the shifts quicker and using the clutch less (less heat - less destruction).
It definitely prolongs your tranny life IF it does what it says.
It definitely prolongs your tranny life IF it does what it says.
Posting Guru
Joined: Oct 2007
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From: Bloomfield Hills, MI
Yes- they will be quite a bit firmer. I have heard it feels good,especially when towing.
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Master of Strokes
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Posting Guru
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From: Bloomfield Hills, MI
I have never driven one - from info i have read the harder shifts are not neck jerking, whiplash causing back breakers lol. Just more solid and more truck like (If you have ever driven a larger truck like say a 34ft or even my old 72' GMC 24' flatbed. I sould like an old man haha)
This may be a question you can ask brian at BTS. Im sure he can do that for your. But for the most efficiency a shorter quicker (and possibly more jerky) shift will cut down clutch time.
I know for a fact brian can tune these differently. I have talked to him about that. He can also match it with the DP tuner so the shifts better match your power curve.
This may be a question you can ask brian at BTS. Im sure he can do that for your. But for the most efficiency a shorter quicker (and possibly more jerky) shift will cut down clutch time.
I know for a fact brian can tune these differently. I have talked to him about that. He can also match it with the DP tuner so the shifts better match your power curve.
Postmaster
Joined: Jun 2006
Posts: 3,135
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From: Brinklow Md
They dont always make the shifts firmer (to the point of jerking you at all really) mine are quicker but not really much firmer unless I hammer it. Brian can tune the Im pretty sure and John Woods might be able to also. give them a call.
If not just tell him if you dont do it your truck can blown up next to a bus load of kids and kill them all lol.
If not just tell him if you dont do it your truck can blown up next to a bus load of kids and kill them all lol.
Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
It is my understanding the mods to the Accumulator VB increase the amount of pressure released to the clutches during each shift. This increases the firmness and quickness of the shift. The line pressure regulator is controlled, by pilot pressure, from the EPC (electronic pressure control) solenoid in the Solenoid Pack Assembly. This signal is sent to the EPC solenoid from the PCM. The PCM controls the pilot pressure, increasing the line pressure as needed for the situation. There is a small piston in the line pressure regulator that helps put more tension on the regulator piston spring and increases the line pressure. See the disassembled line pressure regulator in the upper left corner of 4th picture in Post #4. https://www.ford-trucks.com/forums/7...l-article.html
Hotshot
Joined: Jan 2008
Posts: 13,144
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From: Rochdale MA
It is my understanding the mods to the Accumulator VB increase the amount of pressure released to the clutches during each shift. This increases the firmness and quickness of the shift. The line pressure regulator is controlled, by pilot pressure, from the EPC (electronic pressure control) solenoid in the Solenoid Pack Assembly. This signal is sent to the EPC solenoid from the PCM. The PCM controls the pilot pressure, increasing the line pressure as needed for the situation. There is a small piston in the line pressure regulator that helps put more tension on the regulator piston spring and increases the line pressure. See the disassembled line pressure regulator in the upper left corner of 4th picture in Post #4. https://www.ford-trucks.com/forums/7...l-article.html
Elder User
Joined: Jun 2008
Posts: 612
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From: Iowa
Think like a manual transmission while trying to explain this. Everybody who has learned to drive a manual transmission has heard the " don't ride the *&^% clutch" rant from their instructor. Normally auto transmissions in trucks are set to the soft side, which means in essence it " rides the clutch " on shift points in an attempt to make them softer and less noticeable. this can cause overheating of transmission fluids, as it is really slippage, which creates heat while it is engaging the clutches and bands more slowly. A faster shift will have less slippage, which means less clutch and band wear, and wala, less heat. For a towing vehicle especially the less heat is critical to a long life transmission. However, it is possible to go too far and have bone crushingly hard shifts in an auto, but generally the aftermarket valve bodies don't go to that extreme.
I know its a bit of oversimplification, but its the best true explanation I can type in less than 10 minutes.
I know its a bit of oversimplification, but its the best true explanation I can type in less than 10 minutes.