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Thread: 4ac to 20v conversion in a ae86

  1. #1
    Member 1sik20valve's Avatar
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    Default 4ac to 20v conversion in a ae86


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    hey pplz
    im new to this website , i have recently found out y all u ppl go nuts over the wonderful corolla ae86 , i have recently purchased 1 (1985 adm ae86 ) and love to drive it .
    i have a few questions for you people that have undergone the conversion of 1.6ltr 4ac carby motor to a 20v silvertop.
    i have a friend that has a 20v silvertop spare and is willin to part out with it .
    what are the main things you have to change for this conversion?

    the silvertop came out of a fwd corolla seca .
    Q1 can i use the same gearbox ive got on my car?
    Q2 can i use the clutch and flywheel off the silvertop 20v ?
    im planing of cuttin the fire wall 2 fit the dizzy .
    Q3 what do i do about the fuel pumps and fuel issues etc ?
    im buying mounts
    Q4 do i need another exhaust from the motor?

    im sure this topic has been covered b4 but im not sure how to search effectivly for it .
    any answers , ideas thoughts and information for my new project would be greatly appreciated .
    thanks pplz

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    Q1: yes. if by that you mean the T50 in the AE86.
    Q2: yes. by no means cut the firewall at all. your smoking your boyfriends arsecrack if you do. you can buy dizzy re-mounting kits, or better yet run individual coils from a GZE instead of cutting the firewall. you will also need a programmable ECU if you like things like a speedo and working dash.
    you will also need to do something about the water outlets at the back of the head. this has been covered many many many many many many many many many times before.
    Q3: couple of options. get a bigger intank pump from a say a toyota avalon or walboro, bosch etc. or use a external pump like a bosch or VL commodore pump.
    Q4: by this you mean exhaust manifold? if so then yes.. you can get a TRD copy manifold from kaizen garage for a good price that will fit.

    there is a search button at the top if that helps.
    Last edited by xero; 15th April 2009 at 09:37 AM.

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    Veteran LittleRedSpirit's Avatar
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    DO NOT BUTCHER THE FIREWALL.

    There is no need to. Butcher the distributor instead. Run like a sack of doorknobs on a standard ecu anyhow.

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    Moderator Sam-Q's Avatar
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    as above, and whats your location?
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

    - SQ Engineering on facebook -

    Please e-mail to contact me instead of sending a private message on here.

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    Member 1sik20valve's Avatar
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    im located in sydney
    can anybody give me any direct links to ppl that have done the entire conversion?
    also with engineering and defects , do the police hammer you when they see that motor in there ?

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    Moderator Sam-Q's Avatar
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    I have done the whole conversion, the link is in my signiture
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

    - SQ Engineering on facebook -

    Please e-mail to contact me instead of sending a private message on here.

  • #7
    Member 1sik20valve's Avatar
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    thanks for the help man
    appreciate it

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    Once you fit a relatively low profile blanking cover on the crank angle sensor (dizzy), one of the heater hoses just touches it, and makes it a little difficult to fit the clamp. I think it is RS-Chita that sell a little ~5mm spacer to put between the gearbox rubber mount and the gearbox crossmember. This tilts the motor for a few mm clearance. I'm not sure if I will bother or not.

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    Veteran LittleRedSpirit's Avatar
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    Must be a bit tighter on an ae86, I have enough room in an AE71.

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    Moderator Sam-Q's Avatar
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    well I have a 3mm gap but I went to the trouble of doing up all my clamps and also putting cable ties from the heater hoses to the metal lines on the firewall all in advance.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

    - SQ Engineering on facebook -

    Please e-mail to contact me instead of sending a private message on here.

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