BA Astina 95 gear ratio

[rejy]

Hi everyone i just bought a 1995 grey BA astina and i noticed the gear ratio is very short is this correct, while around town driving it does around 2300rpm at 60ks but it sounds like i am in 3rd gear and needs to go into 4th is this normal for these cars . Im comimg from a history of tx3 lasers thinking they would keep the same gear ratio, and that is im asuming they used the same gear box. Can anyone please shed some light onto my problem.

[jordy]

Is that 2,300 rpm in 4th? That sounds about right.

My BG would be doin about 2,600 rpm in 4th at that speed, so normally i'd be in 5th in which case it would drop it to about 2,100 rpm at 60km/h. Mine has a close ratio box though, open road (100km/h) I'll be doing about 3,200 rpm.

The lower the better anyway, more power to the ground.

[rejy]

Hi jordy yeah thats right 2300-2500rpm at 60ks an hour, yes your right getting power down quick could be good but im also thinking of when i get a sports exhaust and how loud it will be at slow speeds but i want power too

[Astro Boy]

Originally Posted by rejy

but im also thinking of when i get a sports exhaust and how loud it will be at slow speeds but i want power too

WTF has gear ratios got to do with your engine being loud?!?!

Shorter ratios, shift same RPM, same noise... or even better, shorter ratios, meaning more tourque, meaning shifting earlier, meaning quieter car...

If you're that worried about gear ratios, go out and buy the biggest, most hectic fully sik chrome rims you can afford, that'll fix everything!

[BigMal]

Remember 95 1.8L = F-Series Gearbox which has lower ratio's than the G-Series.

[jordy]

Out of curiosity, what would the F series be pulling in 5th at 100km/h?

I think I remember someone saying aus never got BGs (G series) with close ratio boxes. I guess all you guys would love my gearbox

[mike_d87]

Originally Posted by BigMal

Remember 95 1.8L = F-Series Gearbox which has lower ratio's than the G-Series.

august 95 on right? my feb 95 has g-series

[rejy]

[QUOTE=Astro Boy]WTF has gear ratios got to do with your engine being loud?!?!

Its got everything to do with it when you driving along in 4th around town at 60ks, when do you think your car is the loudest i would think when your reving it right!! well when driving a car with higher revs ie an astina like mine at low speeds or the speed limit what effect will it have on the noise factor given its already reving conciderably high already. You would have a car with constant loud noisie. In my old TX3 you needed to give it a good boot full to get a loud tone but atleast i could choice when it was loud or not because apart from the high ratio on the ba the laser had a very low rev at 60ks therefore i could have a loud exhuast but while driving a car with a much lower ratio ment it wasnt reving get it. Not loud

[rejy]

Originally Posted by jordy

Out of curiosity, what would the F series be pulling in 5th at 100km/h?

I think I remember someone saying aus never got BGs (G series) with close ratio boxes. I guess all you guys would love my gearbox

Hey Jordy!! at 100ks the revs are almost 3000rpm

[Astro Boy]

Originally Posted by the easter bunny

Its got everything to do with it when you driving alone in 4th around town at 60,000ks, when do you think your car is the loudest i would think when your stero's turned up right!! well when driving a car with higher boost ie an astina like mine on speed or the speed limit what effect will it have on the sikness factor given its already reving conciderably high already. You would have a car with constant loud noisie. In my old TX3 you needed to give it a good boost full to get a loud bark but atleast i could choice bro when it was loud or not because i spread her apart from the high ratio on the ba the laser beam had a very low rev at 60yrs therefore i could have a fully sik exhuast but while driving a car with a much lower ratio ment it wasnt reving get it. Not loud

Still not really following... But, shorter ratios allow you to shift sooner than taller ratios, you plainly said 'around town' and 'slow speeds' in which case gear ratio will make squat difference to how loud your car is, infact shorter ratios will make it quieter because of the ability to shift at a lower RPM... its only when you start grabing top gear and highway speed that a shorter (not short... race cars have short gears) gearbox will make a car louder...

What do you think is going to be louder, a VZ commodore with the alloytec and 4spd auto ****box (like mine! ), or a new VE with the same engine and the new 6spd auto? Whereas mine needs at least 2700-2900rpm to shift comfortably, the new commodore only needs 2400-2500rpm....

Maybe the moral of the story is don't fit a 7" cannon to a generic FWD buzz box... oh, and what's a noisie?

[rejy]

[QUOTE= what's a noisie? [/QUOTE]
i was waiting for someone to pick that up I dont think im explaing myself right. let me try on emore time. Lets not worry about the changing of gears then, and imagin a naked woman, no not that, imagine car number 1 travelling at 60ks and its 4 gear which is the most used for around town driving has a rpm of 2500rpm at 60ks. Now imagine car 2 travelling at the same speed but its rpm is 1500rpm which car would sound louder. do you see where i am coming from now.


Can anyone else see what im saying or am i just loosing it.

[project.r.racing]

car 1 would be louder if all factors are the same for both cars

[rejy]

HAHAHAHA there will be no such size going on my car, those cannons can stay in the shop.

[rejy]

Thats right deejay!! Sorry astroboy i think i confused you my bad.

[project.r.racing]

Originally Posted by BigMal

Remember 95 1.8L = F-Series Gearbox which has lower ratio's than the G-Series.

I thought the F series had taller gearing than the G series? Hence why cars with G series boxes in car acellerate better. I'm prolly wrong.

Ryan

[chicaboo]

Just for some contrast: on the 1.8 FP F series, only 1st and 2nd are SLIGHTLY shorter than the 2.0 (SP20) FS G series, 3rd is the same, and 4th and 5th are actually shorter on the SP20! But the SP20 runs taller tyres too...

[BigMal]

Mine used to be 3200 or 3300 for 100km/hr(Bad memory) with a F and is only about 3000 with a G5M01.

[boostedbatman]

You may also find that the noise is attributed to bad timing and nothing to do with your gear ratios
And the difference of 10% in the revs will hardly be noticeable
For the difference WONT be 2300rpm vs 1500rpm

[project.r.racing]

i have an F series and i only do 3000rpm at 100km

[mazdamanik]

i dont thnk anyone has suggested it yet but instead of worrying bout rev in 4th at 60....try shifting to 5th....there is a reason its there, i have a 92 BG with the F box, it does have closer ratios and in 5th at 60 its revving at about 1700...at 100 its sitting just under 3....prob be bout 2800 - 2900. i also find that with the exhaust it is loudest at about 3-4000 in 3rd