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Thread: French GC8 (slow) project

  1. #1
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    Hi Guys,

    First of all, sorry for my poor English, I leave in France [img]tongue.gif[/img]

    I'm reading this forum since several months, and I like the "spirit" here. So I've decided to register me and try to show you my very long term project... and when I'm seeing most of projects here, I feel shy because mine is very low level.

    I own my GC8 since 7 years now, bought standard.




    Now :






    Current mods :

    Chassis
    - Cusco Zero II-e coilover
    - Lower Front arms STI (aloy)
    - Genuine STI upper arm bar
    - Cusco Lower arm bar (4 points)
    - Whiteline ARB 22mm adjustable F&R
    - Cusco front links
    - Whiteline steering bushing
    - Cusco rear strut bar + V-Brace
    - Whiteline KSB750
    - Rear trailing arms (ball joint) from Massive Performance

    Brakes
    - Front & Rear Brembo STI brakes. Caliper resprayed in grey => Replaced by AP Racing 6 pot CP7040 + AP Racing 4 pot CP7625
    - GrN Brake discs => Replaces by AP Racing 335mm front + 335mm rear
    - Cosworth Trackmaster brake pads => Replaced by Pagid RS15
    - Stainless steel brake lines
    - Perrin brake master cylinder stopper

    Gearbox
    - Newage 6 speed gearbox
    - R180 rear diff
    - Fidanza 5 speed light flywheel (4,3kg)
    - Exedy OEM clutch
    - STI gearbox mount

    Engine (roughtly standard at the moment)
    - Blitz DV
    - Piggyback ECU
    - STI engine mount
    - APS decat exhaust 3,5'
    - Fuelab FPR
    - Parallel fuel rails
    - Walbro intank 255l/h
    - Accusump (not fitted yet)

    Interior
    - STRI gauges
    - Zeitronix WbO2

    Now, I plan to work on the engine :
    EJ20 CDB with oil squitters
    2,1 stroker kit
    JDM AVCS heads big port, ported and polished. Cosworth exhaust valve +1mm
    Syvecs PnP ECU
    Chevron/Owen performance twin scroll turbo
    OEM Twin Scroll Header and other supporting modification

    It will be a street car with some trackdays... hope around 400bhp with good response

    Just for fun :
    Last edited by Chartreux; 24th April 2016 at 17:26. Reason: Brake update

  2. #2
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    Nice to see that the Impreza spirit is alive in France [img]smile.gif[/img] Nice looking car and nice scenery !.

    I am on a similar path with an MY98 Classic which has got a 2.1 stroker installed earlier this year. Am looking for 400 to 420 bhp when I add an S206 later this year. I'm using the S206 as it came off another car which I am breaking. I gather while it is a good 2.1 stroker turbo, it may not be as good as an SC46 ?

  3. #3
    Super Moderator MAD Hammer's Avatar
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    You will see more power from the s206 but spool won't be as ood from what I have seen.
    Key sponsors - Stella Motorsport/SD Motorsport/Area 52 Autosport/AS Performance/REIS.co.uk

  4. #4
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    I was going by a recent comment on here on another thread that said that an S206 would not be a first choice - but I think it would still be a good choice. The S206 was on a 2.5 when I first bought it and the car. It was a good choice on the 2.5 and I'll be interested to get it on the 2.1 to compare.

  5. #5
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    You'll love the S206 on a 2.1 Keith !

  6. #6
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    Hi Martyn - this is the same turbo you mapped to nearly 470 bhp on Brett's Green MY99. I had fun with it on the 2.5, now going to put it on my 2.1 stroker when I get chance

  7. #7
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    Update from August

    As said, it's a slow build, but still ongoing

    Rear trailing arms finally fitted



    ...some brake porn... Find them on a rally car with few miles for a bargain... couldn't resist. Brake pads totally melt (DS3000 + DS2500). Have to find new ones
    Front = CP7040 335mm (fit 17 wheels)
    Rear = CP7625
    Need a respray before fitting. I'll paint all in black (or dark grey) colour with Yellow letters for AP Racing. I'm fed up with grey colour of Brembo and it's very difficult to keep it clean.
    The fixing bolt (in white) must be replaced because "only" in class 8.8, and according to AP Racing, they should be in class 12.9 like the other bolts




    Fitted




    Last edited by Chartreux; 24th April 2016 at 18:08.

  8. #8
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    Nice project mate,Loving the APs,how much of a bargain then bud?!

  9. #9
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    Similar to my setup with the adjustable lateral arms and adjustable drop links.....I have the front ap's, only wish I could have the matching rears.

    Keep the updates coming ;-)

  10. #10
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    Quote Originally Posted by Prodriverules View Post
    Nice project mate,Loving the APs,how much of a bargain then bud?!
    less than 1200 for the front + rear, and less than 800 kms

  11. #11
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    Quote Originally Posted by Shmerman View Post
    Similar to my setup with the adjustable lateral arms and adjustable drop links.....I have the front ap's, only wish I could have the matching rears.

    Keep the updates coming ;-)
    Thanks for your comment mate

    For the lateral arms, I had to reverse the rear lateral arm. As you can see on the picture below, the sway bar was in contact with the arm, just where the drop link was fixed

  12. #12
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    Brakes fitted with Pagid RS15 pads. Very good !!! and it's not possible to have bigger brakes inside 17' wheels. There is a gap of few mm between caliper and inner of the wheels.
    Very happy with brake power and pedal feeling. Not tested yet how it resist to heat, but I'm very confident

    With winter wheels :




  13. #13
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    I'm impressed !!! when I see the distance between inner wheel and my caliper... amazing !!

  14. #14
    Senior Member BIG FUD's Avatar
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    I have same spec but a sc42 twin not 46 and i did amazing in a new age so should be great.

  15. #15
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    Quote Originally Posted by Paul@Zen View Post
    Low offset wheels with 25mm spacers means the caliper sits well inside the wheel in the largest part, but it's still close.
    I understand, I had to remove all balancing on the wheels and relocate it to allow wheel fittment.
    An upgrade to 355mm with 17 wheel could be an option if I decide to enlage wheels with fender flares. Thanks for the idea

  16. #16
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    Quote Originally Posted by BIG FUD View Post
    I have same spec but a sc42 twin not 46 and i did amazing in a new age so should be great.
    I'm very happy to hear this. I still hesitate between SC42 and SC46 to be honnest. I know that SC42 will be more responsive, but SC46 can be pushed in the range of 450+ with right fuel. As I plan to upgrade my new heads (AVCS big port) to have rev at 8k+... still unsure about turbo choice.
    I don't want to go rotated for the moment.

  17. #17
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    good looking car mate, your alittle further down the same route i m hoping to go this year, im interested in the adjustable arms, were they only touching the arb cause its on the stiffest setting?

    im replace bits under my car at the minute is it worth buying adj arms? ie good value for money?

    keep pics up

  18. #18
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    Hi Mate,

    They're touching ARB because I've made mistake and mounted it in the wrong way. Now that it's mounted on the right way it's OK, even if they are not really designed for classic, but for WRX 02+
    I've choosen those arms because I found it was thicker than fleabay parts. Paint is thick and since August they still not rusted and still look very good... and I like purple color lol


    It's only my personnal feedback, but I really feel a stiffer rear end, more accurate in the corners. Not really noticed drawback at the moment, even the NVH are still covered by exhaust.
    I didn't took time to make a good adjustment, I had issues with wheel bearing, but I'll try different settings in the future, specially on the rear, that's why I wanted adjustable links. But to be honnest, if you don't want to adjust rear, I think it's not worth having it.
    Maybe a set of good bushing in the standard arms would be enough for most of peoples.
    I don't have new pictures for the moment.

  19. #19
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    dead on cheers think i ll just leave it. the list of bit you can buy is never ending lol

  20. #20
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    Some update

    After long period, I've decided to let the engine build to a professionnal... and save me some time.
    Now my short block is in EngineTuner shop to be built

    Here some pictures of the build sent by Alan, Thanks again to him




    Rear end thrust conversion



    Mahle Pistons


    K1 rods and crankshaft



    Next step will be to send him JDM big port heads for some "modification"
    Last edited by Chartreux; 24th April 2016 at 18:16.

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