new post bout gear ratios like 1 below

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

i got my gem registered, and after a reco eng, and a 4sp, one the way 2 the roadworthy fags to get roadworthy, i noticed the the little gems revs are really high for the speed it is goin, the power is ok, it can go if u give it a kick up the ass, does bout 60 in 2nd, and about 6000 revs, but the revs shit me, the whole point of a little car is so it will take little pertrol, but at 100, i'm assuming it will have bout 4000 or even more, whereas as a skyline, 89, has just under 2000, and would be more economical than the gem.

anything to get round this?

TXcoupe · petrol head Joined: 05 Oct 2001 Posts: 1675

get your speedo checked
mine does about 60 at 4000rpm
in second

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

4 or 5 spd?
i got a 4

HONES · petrol head Joined: 04 Feb 2002 Posts: 1786

buy a 89 skyline?

or drop that donk into ur car! hehe

Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

Sounds like you want a 5 speed then. You could try some bigger tyres.

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

nah, 21's r big enough for me. kiddin, i got 185x65x14, on bmw interceptor steelies.

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

i think they're actually 60 profile, but it doesn't matter for shit,

Benjamin · backyard mechanic Joined: 05 Oct 2001 Posts: 525

Sounds fine by me, I got similar wheel size and profile.

100Kmh was about 3500rpm in 4th
100Kmh is about 3000rpm in 5th

Methinks your tacho is out, there is no way (unless you have a 4.11 diesel diff) your engine should be doing 6000rpm in 2nd at 60Kmh.

Even with all your revving she will be pretty economical. There is no need to rev the tits off her to get anywhere. Some mods like extractors etc will help coz you don't need to thrash her to keep up.

Cheers

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

is that the stocko standard 5spd gemi gearbox, cos i thinkin of gettin one?

Benjamin · backyard mechanic Joined: 05 Oct 2001 Posts: 525

Yup. You won't notice any change in the lower 4 gears, however the 5th makes a huge difference to economy. I can still get roughly 550km per tank on a mild G161. The 5spd TX could get up to 600km per tank (no Weber or extractors etc).

Years ago I took my 4spd TX from central VIC to nth NSW, about 1200km in total. We got about 450km per tank and were revving at 4000+rpm all day (approx 110-120kmh). Needless to say my head was sore from the 10hr drone.

And I'd do it all again Smile

The 5spd slots in dead easy.

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

yea, that's the only thing i'm curious bout, i just wanted to know the difference between 4sp and 5sp, was the 5 gears in the 5sp, exactly the same as the 4sp, except just spread out over 5 gears, or was the 5th gear like and additional gear.

chris.

Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

5th is an extra gear, called an overdrive. First four are the same.

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

thanx man