Don't Understand Valve Body Upgrade

trdracer · 08-24-2003, 10:32 PM

I just don't understand how this mod helps with a supercharged truck. People say you get better performance, but I thought this just makes those with auto trannys shift sooner. Why would upshifting sooner make the truck faster? I'm supercharged, but I drive with the ECT on all the time because I DON'T want to up shift

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PhxTRDRunner · 08-25-2003, 12:03 AM

I believe it allows more fluid to travel through the transmission thus reducing the heat buildup...which blows trans's.

kaneman23 · 08-25-2003, 05:16 AM

What PHXTRDRunner said. The VB upgrade improves the fluid paths through the VB and trans allowing it to shift harder and quicker. Ever noticed how the auto takes a while to shift between gears, as if it's slipping? The delay and slip is what builds heat in the trans and destroys the clutch packs.

The VB upgrade is more for longevity but the peformance is also nice.

MTL_4runner · 08-25-2003, 05:26 AM

My understanding is that it changes the band lockup points (done by changing the fluid flow)......on a stock tranny they wanted to allow the bands to slip more and give you smoother shifts.....not a problem for heat buildup on a normally aspirated motor. On a supercharged motor you are able to make the bands slip much more because of the huge increase in torque and HP and this slippage creates a massive amount of heat which must be dispersed (and it has no where to go). If you are not a jackrabbit off the line with the new S/C you might be ok, but most have the S/C for just that .......acceleration!!!......so if your going to try to test your 0-60 times.....do yourself a favor and save the tranny from an iminent rebuild and do the mod.

j-dub · 08-25-2003, 12:35 PM

Could somebody post the VB upgrade info or a link?

rimpainter.com · 08-25-2003, 12:41 PM

Quote:

Originally posted by j-dub
Could somebody post the VB upgrade info or a link?

www.gadgetonline.com

Poke around his site, you wont be disappointed.

j-dub · 08-25-2003, 01:01 PM

Thanks

08-25-2003, 12:03 AM	#2 (permalink)
PhxTRDRunner Registered User Join Date: Nov 2002 Location: Phoenix, AZ Posts: 695	I believe it allows more fluid to travel through the transmission thus reducing the heat buildup...which blows trans's. __________________ '00 4runner Sold '94 Supra 6spd tt '05 Tacoma Double Cab 4wd TRD Offroad

08-25-2003, 05:16 AM	#3 (permalink)
kaneman23 Registered User Join Date: Feb 2003 Location: N.VA Posts: 256	What PHXTRDRunner said. The VB upgrade improves the fluid paths through the VB and trans allowing it to shift harder and quicker. Ever noticed how the auto takes a while to shift between gears, as if it's slipping? The delay and slip is what builds heat in the trans and destroys the clutch packs. The VB upgrade is more for longevity but the peformance is also nice. __________________ Supercharged 99' Tacoma TRD 03' 4Runner Sport Edition V8

08-25-2003, 05:26 AM	#4 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,807	My understanding is that it changes the band lockup points (done by changing the fluid flow)......on a stock tranny they wanted to allow the bands to slip more and give you smoother shifts.....not a problem for heat buildup on a normally aspirated motor. On a supercharged motor you are able to make the bands slip much more because of the huge increase in torque and HP and this slippage creates a massive amount of heat which must be dispersed (and it has no where to go). If you are not a jackrabbit off the line with the new S/C you might be ok, but most have the S/C for just that .......acceleration!!!......so if your going to try to test your 0-60 times.....do yourself a favor and save the tranny from an iminent rebuild and do the mod. __________________ - Jamie 1996 4Runner SR5 4X4 Auto Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift Best OBD II scan tool I have used!. .....and I am AMERICAN!

08-25-2003, 12:35 PM	#5 (permalink)
j-dub Registered User Join Date: Aug 2003 Posts: 81	Could somebody post the VB upgrade info or a link? __________________ "POLICE STATION TOILET STOLEN ... Cops have nothing to go on."

08-25-2003, 01:01 PM	#7 (permalink)
j-dub Registered User Join Date: Aug 2003 Posts: 81	Thanks __________________ "POLICE STATION TOILET STOLEN ... Cops have nothing to go on."

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