3rd Gear ratio

Josh · backyard mechanic Joined: 04 Oct 2001 Posts: 602

Just wondering what the deal is with the 3rd gear ratio in my 5 spd??? Seems like when I take off hard 1st winds out good, Then rev 2nd out to about the same as 1st and then when I het 3rd my rev drop down too much??? Anyone else noticed this? It's not such a bad thing, Just a sham they could have had closer ratios between 2nd and 3rd...

Josh (WA)

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

I am not sure which box you have, but mine has a slightly lower 1st than the 4spd boxes, meaning a bigger jump to 2nd. The gap from 2nd to 3rd is good and doesn't drop my revs that much, probably 750rpm or so (can't confirm, no tacho).

I like 3rd, it is right in the meat of the power and you can tootle from 50kmh through to about 120kmh if your engine is flexible enough.

Maybe your engine is a bit low on torque Josh, and it can't pull itself out of a hole? Mine used to be like that with 1st and 2nd, requiring I rev the tits off her in 1st so I didn't lose drive in 2nd. All fixed now that I have more grunt Smile

Cheers

Josh · backyard mechanic Joined: 04 Oct 2001 Posts: 602

yeah my cam dont start making power till about 3500 rpm

andy c · tinkerer Joined: 17 Apr 2002 Posts: 75

yeah im the same as you ben, i can get 130kms out of my 3rd gear at bout 7000rpm. i love it!!

Corty · tinkerer Joined: 01 Nov 2001 Posts: 126

Ratios for 4spd/5spd and diesel are as follows

Early 4spd Late 4spd 5spd Petrol 5spd Diesel
1st : 3.51 3.79 3.79 3.48

2nd : 2.18 2.18 2.18 1.99

3rd : 1.42 1.42 1.42 1.36

4th : 1.00 1.00 1.00 1.00

5th : n/a n/a 0.86 0.86

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

So maybe Josh has a Diesel box without him ever knowing it?

cool gem · rice boy Joined: 16 Apr 2002 Posts: 39

I have a diesil 5 speed in me gembanga with a worked two littre and thierd gear seems good to me if anything the 1st gear is to tall reves out realy quick.

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

na he has a early TD box his revs drop as normal but the cam he runs dies in third as most gems do i had this prob and now with new gear in the engine and clutches it will out to about 125 in 3rd but if he is changing gears at 5500 or 5000 you will notice it being sluggish but if he revs it to 6000 when the cam stops working the car will be on the torque curve when he shifts to thrid or fourth

Josh · backyard mechanic Joined: 04 Oct 2001 Posts: 602

Who knows???... Not me! I do like 3rd gear but! Thats the gear I catch VS commonwhore in and then they overtake me again =D

Racegem · backyard mechanic Joined: 30 Jan 2002 Posts: 987

F**k me! LOL I think you may have answered your own question. That's a pretty wild cam.

Josh · backyard mechanic Joined: 04 Oct 2001 Posts: 602

Na it's pretty mild actually

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

yeah considering the cam is a 2000 to 6000 cam yonne

Racegem · backyard mechanic Joined: 30 Jan 2002 Posts: 987

Should be making power before 3500 then, even in third.

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

yeah its also a prob when you are revving it to 4600