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Thread: Modifying my astra from stage1 to stage3 !! New user!

  
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    D-Spark's Avatar
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    Modifying my astra from stage1 to stage3 !! New user!

    Hi everyone!

    I'm a new user from Finland and this is my first thread.

    So i have a 2003 astra bertone turbo coupé with z20let engine
    and last July i went to re-program the car and they promised me about ~240hp and 370nm of torque.
    Now my astra has been in my carage since November because of our winter over here. A few months earlier i started planning upgrading a few parts in my car so i bought firstly a vxr turbo(z20leh) from ebay. So now i need a better
    intercooler and a pipe for the pre-cat. Which size should the pipe be? 60 or 70mm? I'm also buying a dump-valve and a this long pipe which has a connection for dump.
    My goal is to achieve 280hp. Is there anything else that i need?

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    jalfrezigazee's Avatar
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    an exhaust system would be a good thing to put on, pipework will be fine at 50mm, a slight difference at 60mm and asaik 70mm is too big and will enduce lag
    Be Happy


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    I know that an exhaust system would be real good after those mods but the thing is that my car has a Irmscher DTM Kit from the factory which includes double exhaust pipes at the back. So i believe it would really expensive if i wanted a bigger exhaust system and still have two pipes from one of a side coming out at the back. those dampers are really expensive.

    How about shortening the airbox? it reduces turbo lag?

    So u recommend more the 60mm substitute pipe for the pre-cat?

    Is there any sense for changing the vxr injectors?

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    Unless you have a full system mate, with pe cat and sports cat you wont be able to get the higher bhps all that hot Gas needs to go some where mate id start there...
    Vxr turbo with 360 bearing and twin oils seals & Evoms dv. Cdti airbox 63mm tophat.Milltex cat back and pre cat.. Regal 245 leh phase 1 ipf remap.Whiteline rarb.

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    WARDY25's Avatar
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    injectors and afm mate go all the way before you have to change internals, think you'll have to do that for 280, with out them you'll be looking round 270 ish
    ASTRA 'J' 330 SRI CDTI RST

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