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Old 02-24-2004, 02:55   #1 (permalink)
1972 XA GS Fairmont
 
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Diff Gears

I have a 72 XA GS powered by a 250 pre crossflow. The car is auto. Will 3.5 or 3.23 diff gears make it easier to do a skid and will the car go harder off the line?
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Old 02-24-2004, 03:22   #2 (permalink)
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Re: Diff Gears

It will help with both skids and acceleration...
can somebody with a little more knowhow please explain the art of diff ratios to this young lad.
cheers
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Old 02-26-2004, 14:18   #3 (permalink)
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Re: Diff Gears

Quote:
Originally Posted by XA Fairmont
I have a 72 XA GS powered by a 250 pre crossflow. The car is auto. Will 3.5 or 3.23 diff gears make it easier to do a skid and will the car go harder off the line?
Depending if your engine is stock or not? If it's stock? I'd go no more than a 3.5. Even semi stock still 3.5.

Problem is diff gears will assist with a skid but if you don't know what your doing you can have 500hp at the wheels and still not do a skid.

Theres a technique which is:

Idle on the spot just creeping along,
Just apply the brakes very lightly. Just enough to stop you,
Keep your foot on the brake lightly,
Thump the throttle and you should have tyre smoke.
If you've applied the brake too hard? You'll look silly.

I used to be able to do it with a 3.0lsd, auto and a clapped out 351 that was running on 5 or 6cyls.

Brenden
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Old 02-26-2004, 14:49   #4 (permalink)
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Re: Diff Gears

I wouldn't go any lower than 3.23 with a stock 250. It will feel like it's revving it's tits off at 100kph with 3.5's

Rick.
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Old 02-26-2004, 22:11   #5 (permalink)
1972 XA GS Fairmont
 
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Re: Diff Gears

So 3.23 are the go?
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Old 02-27-2004, 07:08   #6 (permalink)
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Re: Diff Gears

gday
im mates with XA fairmont and we tried "brenx's" method but still no go
the motor went "pop" ,hesitated then took off
do ya reckon its asking to be tuned?
the same popping sound is heard when doing donuts
as soon as he gets halfway round it does it
cheers
cam
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Old 02-27-2004, 14:00   #7 (permalink)
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Re: Diff Gears

If you are really serious about doin a skid, Get yourself a spare diff, Weld it, Disconnect ONE axle, And you'll spin the tyre in any gear... you'll easily hit max revvs in top gear with one wheel spinning... And there will be so much smoke no one will notice only one wheel is spinning, you also save money spinning one at a time...

I broke an axle in my ex-skyline, and the diff was welded.. I couldn't take off in any gear without doing a burnout (6 cylinder 2.4 litre engine with Auto)..

I took off in Second gear.. no brakes, and proceeded to do a 250 m burnout with the wheel spinning at 130 km/h all the way, until the cops defected my car....

Top revvs in 3rd was pulling about 210 km/h... And that heats up the tyre a hell of a lot... I shut down an entire road out the front of my house due to the smoke coming off the tyre, and the tyre was shredded within 1 minute
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Old 02-27-2004, 14:06   #8 (permalink)
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Re: Diff Gears

Another thing, Disconnect your brake lines to the Rear brakes.. solves the problem quick, Hold your brakes on hard, back wheels will spin easy...

Question... I have a 1977 zh fairlane with 9 inch LSD, what ratio would this be?
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