Topic: Vacuum from Toyota Corolla 4A-GE 20v

http://i197.photobucket.com/albums/aa278/allyzone22/4_throttles.jpg


   1.      Brake vacuum from side of throttle 1 behind butterfly (big hole)
   2.      Fuel return to tank (entry) [from regulator]
   3.      Fuel return to tank (exit) [to fuel tank]
   4.      Brake vacuum from side of throttle 4 behind butterfly (big hole)
   5.      Idle Speed Control Valve (ISCV entry)


The brake vacuum is taken from throttle 1 & 4 via a side port. They are summed by a T-joint before connected to the brake servo. Since throttle 4 is far from brake servo hence it is connected to another pipe then to the T-joint (not shown).

http://i197.photobucket.com/albums/aa278/allyzone22/brake_vacuum.jpg

http://i197.photobucket.com/albums/aa278/allyzone22/many_vacuums.jpg

   1.      Brake vacuum
   2.      Fuel input
   3.      ISCV input
   4.      Pressurized output for air-cond idle up valve
   5.      Pressurized output for power steering idle up valve at steering rack & pinio
   6.      From point 11 (hidden behind point 3) pressurized
   7.      From point 10 vacuum of throttle 4 - going to Throttle Opener
   8.      To Charcoal Filter
   9.      Fuel return to tank (exit) [to fuel tank]
  10      vacuum to point (suspect to point 7


http://i197.photobucket.com/albums/aa278/allyzone22/evap_vacuum.jpg

In order to get very stabilized "balanced" vacuum, drill extra hole pointed by the circle below for optimum performance.

http://i197.photobucket.com/albums/aa278/allyzone22/future_vacuum.jpg

Individual throttle body vacuum matching / balancing via mechanical fine tuning through valve opening. The valve limits the amount of air that by-pass the butterfly.

There are two holes behind the butterfly.

http://i197.photobucket.com/albums/aa278/allyzone22/idle_vacuum.jpg

Idle Speed Control Valve - output then finally into intake via the red circle below.

http://i197.photobucket.com/albums/aa278/allyzone22/ISCVroute.jpg

Notice the old 4 throttles (shown below) does not have the opening (shown above) and that the injectors output spray is significantly hindered when comparing 4 throttles from generation year 91 against year 93 June till 20vMAP edition. The year 93 unit is so much better.

But this does not mean the old 4 throttle does not have all 4 ISCV holes. They are hidden from current view, but shown by the 4 purple arrows.

http://i197.photobucket.com/albums/aa278/allyzone22/old_4_throttles.jpg

   1.      Brake vacuum from side of throttle 1 behind butterfly (big hole)
   2.      Fuel return to tank (entry) [from regulator]
   3.      Fuel return to tank (exit) [to fuel tank]
   4.      Brake vacuum from side of throttle 4 behind butterfly (big hole)
   5.      Idle Speed Control Valve (ISCV entry)

Red color

   1.      ISCV
   2.      ISCV
   3.      ISCV
   4.      ISCV

Pictures below courtesy Mr. Wong Yee Yong (forum member www.zerotohundred.com)

ISCV holes from 1st generation ITB.

http://i197.photobucket.com/albums/aa278/allyzone22/ISCVhole2.jpg

http://i197.photobucket.com/albums/aa278/allyzone22/ISCVhole.jpg

http://i197.photobucket.com/albums/aa278/allyzone22/XS-3.png
1998 Honda VTec Turbo
2007 ICupra TDi BTurbo
2010 Toyota Corolla 1.3i

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(ex) 2005 Tazz 1300

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Re: Vacuum from Toyota Corolla 4A-GE 20v

i just love the way ADZ explains this ../../extensions/custom_smilies_2/img1/wink

180BHP 165NM
1400 vvt 13.9--> 400m 10/03/2012
Built by Ebrahim Shabudien
Tuned by Nazeem Sirkhotte

http://i97.photobucket.com/albums/l221/mureed/20motor.jpg
http://i97.photobucket.com/albums/l221/mureed/NissanChamp.gif

Re: Vacuum from Toyota Corolla 4A-GE 20v

thx very helpful info

http://img704.imageshack.us/img704/7318/serchmarclogo.jpg

Re: Vacuum from Toyota Corolla 4A-GE 20v

thanks for the info ../../extensions/custom_smilies_2/img1/whistling

2002 factory stock 20v 15.22 TUNED BY SILENT KNIGHT ../../extensions/custom_smilies_2/img1/devil
1997 dbn stock vtec  14.70 TUNED BY POWERTEK RACING DEVELOPMENTS ../../extensions/custom_smilies_2/img1/devil
2005 toyota hilux 2.0 TUNED BY DAYAS AUTO ../../extensions/custom_smilies_2/img1/devil

Re: Vacuum from Toyota Corolla 4A-GE 20v

insaneO. wrote:

thanks for the info ../../extensions/custom_smilies_2/img1/whistling

KEEP QUIET YOU  ../../extensions/custom_smilies_2/img1/biggrin2

ex : 2000 rsi 20v ( 170whp)
ex : escort mk2 .2l8v throttle bodys ( 180hp @ odr , 14.338 @ mtutuba, 15.5 @ 1st avenue)
ex : toyota box corolla ( 1.8t3 with 45mm sidedrafts tuned by me )

Re: Vacuum from Toyota Corolla 4A-GE 20v

Has somebody done a turbo setup with this engine? I need a guide on routing the vacuum lines for a turbo setup and with a Microtech ECU. If someone has done it, can you please share it? Thanks in advance for your help.