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Thread: my turbo smallport plans. what you think?

  1. #1
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    Default my turbo smallport plans. what you think?


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    hey guys im in the process of freshening up the smallport 4age i brought. i plan to rebuild the bottom end with standard crank and rods then some acl race series piston, rings and bearings. i just plan to rebuild the head to stock(maybe some port and polish???). i am thinking about getting the block o ringed with a copper head gasket to ensure no problems. i am contemplating running a bigport tvis manifold as i heard somewhere some people run them to help bottom end power with a turbo set-up. and finally running a t25g. un sure what ecu to run i was thinking about a razorback one but cant find much info on them. what boost to run??
    anyway let me know if my plans are on the money or not.
    cheers
    nic

  • #2
    Senior Member Simon-KE70's Avatar
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    big port mani wont fit small port head so scratch that. dont even worry about o'ringing the block either. just machine all th surfaces and then run a quality headgasket. wouldnt worry too much about the head either, just make sure its in good condition.

    as for everything else.. go for it.

    your motor will handle whatever boost you want to run.... its all in the tuning as to if it can hold together or not.

    but that said. the T25g is shit and wont do much more then 14 psi without falling apart and even then thats right on the edge of the efficiency map.

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    what about a t28 bush bearing turbo? also i was going to use a manifold adaptor. or u think the tvis manifold isnt worth using?

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    Senior Member Simon-KE70's Avatar
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    no i dont think its really worth using.

    the t28 bush turbo (as found on ADM s14's and s15's) is still a good turbo and can be had for quite cheaply these days.

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    get a t3 bigport-smallport mani adaptor def get a bush bearing t28bb head will be fine and use toyota pistons not aftermarket junk. run 20psi make 180kw sik!!!

    should buy my turbo setup that would make your life heeps easier and cheaper!!!
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    definately, get eddies setup, then you can also say you have a professionalk dirft engine in ya car

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    nah eddie wants too much. im going to get gze pistons now. anybody got the part number for smallport gze piston and rings??

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    brand new t28bb 1100 manifold 400 cooler 250= $1750 and thats without all the other pieces to make it all work adn im asking $1500?

    neway like i said b4 i got some near brand new gze pistons here did like 2 laps of the block before i realised the block was cracked, and brand new rings to go with them!!!

    all up the pistons are around 500 and rings 180 new from toyota
    AE86 THE BEST

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    There was a group on ebay (that sells MG parts of all things) that were able to do the ACL forged pistons for ~$700

    And i think your setup sounds good. Standard crank and rods are great, and the pistons you want to use can take a hell-of-a-lot of abuse.

    Don't bother with the O-ringing

    And also (as simon said) T25/T25g's are shit. T28 and upwards thanks.

    Boost depends on your turbo. No point running your turbo out of its' efficiency range. I.E. Don't push any of the standard T25/T28's over 15psi, the power gains will be minimal and you will just stress shit out.

    Although if you go a 'better' turbo, things might be different.

    Your engine should handle 250rwkw.

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    how much are you after for the piston and rings eddie? are they smallport ones? i have to find out wether i can run standard size pistons pretty sure the block is in fine condition.

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