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Alfa Romeo Alfetta GT - Group Sc Historic

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  • Nafe
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  • Nafe
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    So Bathurst has come one gone. Managed to get the car down into the 3:02 bracket..... still 5 sec slower than the old car which has all the aero of a brick.

    Prep for Bathurst included
    - rear springs and shocks out of the old racecar. Tested at EC and worked well, no more understeer
    - bedding in some new pads (Porterfield R4 racepads)
    - bolting in raceseat from the old car (sits a little high, but no time to make new mounts to lower it)
    - fitted up old extractors and exhaust from the old car. Fucking around for hours trying to get it to mount properly, and make it sit the way it should (epic loosening and re-tightening of the mounts and chains holding the muffler etc).

    Didn't get to change to the old radiator (thicker core), or oil cooler (haven't worked out how to mount it yet as the remote filter we have sat where the battery sits in the new car). Haven't swapped over the bigger driveshafts yet either (V6 ones, thicker and stronger for standing starts).

    What went well on the weekend
    - stock radiator and no oil cooler , but no temp problems, good oil pressure.
    - handling was good (finally!)
    - brakes stood up well (even though we flat spotted the left front on Saturday arvo avoiding a Commodore stopped sideways in the Dipper - video to come of that one!).

    What didnt
    - fuel pump leaking on Sunday morning meant no 3rd race, but it was red flagged after a WRX tagged the wall at Forrests, so we only missed 2 race laps.
    - cams in the engine are too big, drops out of the power band on up shift making the climbe up the Mountain very fucking long
    - gearshift is still vague, have to remedy that so it shifts like the old car (there's a trick to modifying this which makes the shift in an Alfetta very direct, positive with good feel.... yes, a miracle!)

    Dad will be racing at the Sports Car Festival at Eastern Creek at the end of May in an All Alfa category. Possibly running Sc Historics at the same meet, but not sure yet.

    Now deciding on whether to
    a. freshen up the old head (valve springs etc) and bolt it along with the intake setup onto the current engine in the car.
    Pro = much cheaper
    Con = we're not sure how hard the current engine has been thrashed, the bottom end is relatively unknown quantity.

    b. rebuild the old engine with a new bottom end and swap the motors over.
    Pro = we know exactly how this engine has been treated over the last 12 years
    Con = more expensive than just swapping over the heads. And our old engine build retired a few years back (we should have gotten him to do one last engine before he retired. The last one he built for us ran fine for 12 years and embaressed many fresher and bigger $$ Alfa engines in that time), so we need to find a new engine builder who will build it up......

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  • Gammaboy
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    Originally posted by ITS60S View Post
    what stud pattern are these?
    ive got some 14x6 performance challengers that may suit if you want them... they are off a cortina so 4x108, i'm pretty sure alfa used the same pattern for a while?
    What offset?

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  • Guido
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    4x98mm.

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  • ITS60S
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    what stud pattern are these?
    ive got some 14x6 performance challengers that may suit if you want them... they are off a cortina so 4x108, i'm pretty sure alfa used the same pattern for a while?

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  • GTV
    replied
    fibreglass ones are available (I think Avanti Spares has them), but they are less forgiving than plastic - which is not good for a low car.

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  • Nafe
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    My front spoilers are a mix of an average one and one that's been patched fuck knows how many times. The Sc guys dump them along with the bumpers. Make the car look shit IMHO, but it reduces drag and increases cooling to the sump, and for brake ducts

    We already go flat into the Chase, the fucking sedan hit a wall at about 6000rpm in 5th.....

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  • GTV
    replied
    Originally posted by Gammaboy View Post
    Alfetta chassis carries more corner speed. easy
    fixed

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  • Gammaboy
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    Originally posted by Nafe View Post
    Some of the guys spend insane money..... we're doing this n a budget, the car only cost me $9k to buy with spare rims, doors, hatch, various parts like brakes, calipers, crankshaft for a 2L etc....now we'll transplant the good bits out of the old racecar into the new one. Hope to at least be as fast around Bathurst in Easter as the old car.
    Will have better aero down the straight for sure - just tell your old man to keep it flat
    Got a source for spare/replacement front spoiler sections? Back when I had mine they were impossible to get, and i managed to crack both mine

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  • Nafe
    replied
    Some of the guys spend insane money..... we're doing this n a budget, the car only cost me $9k to buy with spare rims, doors, hatch, various parts like brakes, calipers, crankshaft for a 2L etc....now we'll transplant the good bits out of the old racecar into the new one. Hope to at least be as fast around Bathurst in Easter as the old car.

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  • Gammaboy
    replied
    Originally posted by GTV View Post
    quoted for truth (in my view it would be both)


    (not that I'm insinuating that any of those REALLY fast Sc Alfetta GTs with '1.8' litres engines that are SEVERAL seconds faster than my LEGAL Nc 2.0 litre 105 GTV are cheating, no, of course not...they're just really talented drivers...especially on the straights, you should see how fast the talent makes them go on the straights)

    If I was doing a new engine for an alfetta, I'd start with a twinspark from a 75 - 20 extra hp for given level of mods (not that this helps when you are halfway there already with a nord )
    Alfetta chassis carries more corner speed. easy

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  • GTV
    replied
    Originally posted by Nafe View Post
    Closer ratios = lots of money = no thanks.

    (let's face it, to get an Alfetta at the pointy end requires a fuckload of cash, or excessive amounts of cheating, or both
    quoted for truth (in my view it would be both)


    (not that I'm insinuating that any of those REALLY fast Sc Alfetta GTs with '1.8' litres engines that are SEVERAL seconds faster than my LEGAL Nc 2.0 litre 105 GTV are cheating, no, of course not...they're just really talented drivers...especially on the straights, you should see how fast the talent makes them go on the straights)

    If I was doing a new engine for an alfetta, I'd start with a twinspark from a 75 - 20 extra hp for given level of mods (not that this helps when you are halfway there already with a nord )

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  • Nafe
    replied
    Closer ratios = lots of money = no thanks.
    Vin did the head and cams, and we'll grab his extractors again, but that's it. We're not in it to win (let's face it, to get an Alfetta at the pointy end requires a fuckload of cash, or excessive amounts of cheating, or both). Dad's head and cams come on strong from 3500, shitloads of torque, so that should help significantly.

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  • GTV
    replied
    Originally posted by Nafe View Post
    Bah, too much work trying to fit a 4.3 crowheel and pinion into the LSD. TwinSpark box is 4.1 final drive, but the gear ratios are taller than the standard Alfetta gearbox. That's why 75s had such tiny fucking wheels, to help the gearing. We'll be running 185 or 195/60R14 anyway, so that will shorten it a bit. At the moment the cams punch power from around 4500 up, my Dad's car makes power from around 3500 through to 7000 so we'll slap that head and cams and intake onto this block. The jetting on the carbs was done by the mechanics, they tuned my Dad's car perfectly based n the cams, and their experience (used to prep cars back int he Brian Foley days). Could always tell the mix was right based on the exhaust tip colour...
    I have a twinspark box in my GTV6 and its only first and second that are taller - but they are pretty good ratios for a stocker.

    You're right in that you need a bit lower torque than 4500 to work with that box, say 4000 so it doesn't die into second and third or rev it to 8000 (or go to Vin Sharp and get some close ratios - the alfetta box can be done with a 2.5:1 first and 1:1 fifth which would be awesome).

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  • GTV
    replied
    Originally posted by Nafe View Post
    I'm not sure re. the 2L engine yet..... I know you can overbore to a degree. I haven't boned up on the Sc regs yet.

    2deg neg is actually the max for Sc too I've been reminded..... *sigh*

    I've got a set of Momo Vegas and a set of Cromodora Daytonas which would suit, but if we damage a rim, we're fucked on getting replacements.
    If you protested on camber most of the field would be out. :rotflol: I suspect some of the fast alfettas in Sc may be GTs anyhow (are they lighter - I have heard they are better built (ie before Alfa worked out that it was good to sell the cars for MORE than they cost to put together) with lighter alloy bits here and there that were de-contented in later models.

    I stupidly raced my 105 on Vegas, now I have 3 good ones and one that serves as an umbrella holder... so DON'T do that with either of those sets, they are too rare to risk.

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