4.30 Final Drive Gears

[Stealth5]

http://www.shaneracing.com./protege.htm
Part number PR-12111

does anyone have this? my friend got a new differential on his 90 bmw 325is and it made a huge difference in acceleration.

 

[igdrasil]

dont remember whats our stock final drive gear ratio....and what will be the effect with this new one 4.3? longer general ratio on every each gear?

 

[70]

dont remember whats our stock final drive gear ratio....and what will be the effect with this new one 4.3? longer general ratio on every each gear?

The stock final drive is 4.105.

A 4.30 would give marginal acceleration improvemtn with out sacrficing to much top end.

The 4.833 that the SWC cars use would be better IMHO...


The 4.30 is a nice in between option though.

 

[Kooldino]

Hmm, we already are a too high of an rpm @ 80mph...

and 1st gear is already short enough

 

[p5sundevil]

kooldino i think this new ratio is supposed to help exactly that, making each gear longer in a way of describing it, I think, i could be wrong and it could be the oppsite like you said but I dont think a company would make a new drive gear that would make that situation worse.

I also hate sittin at 75 in the freeway and my cruise control is on and the rpm is at 3500+

my dads chevy s10 sits at about 80 at 1600rpm, WHOA...of course 6cyl.

 

[RyanJayG]

thats a big time O/D... the torque of the v6 helps to turn those gears but. we can only wish for an O/D like that or maybe a 6th gear

 

[igdrasil]

yeah, I dont know why mazda choose so low gearings if our cars have plenty of torque to move them.

1st gear with turbo in our cars are nearly useless, you start feel the power in 2nd gear.

 

[70]

kooldino i think this new ratio is supposed to help exactly that, making each gear longer in a way of describing it, I think, i could be wrong and it could be the oppsite like you said but I dont think a company would make a new drive gear that would make that situation worse.

I also hate sittin at 75 in the freeway and my cruise control is on and the rpm is at 3500+

my dads chevy s10 sits at about 80 at 1600rpm, WHOA...of course 6cyl.

No...The higher the number, the shorter the gear is.

So, a 4.30 is going to put you at higher RPMS at the same speed vs the stock ratio.

Hence why you accelerate faster...

 

[INGREXCO]

i wouldnt mind that... with a 6th speed

 

[Lurch]

A lower ring and pinion is one of the best "bang for the buck" mods you can do to your car. The 4.3 is the same r&p that was in the Probe GT with the G-box. If you wanna raid a junkyard and get a PGT box, split the case (inspect the gears and forks while you're in there), put it back together with your Protege bellhousing and you have a much better gearbox. The individual ratios are better spaced and the r&p adds a lot of snap. 5th is still mathematically good for 130 or so mph, so that is not an issue (don't need a 6th gear).

I use that box with the Emco 4.8 r&p since on rallies we rarely get over 120mph, and that is still attainable at 7800rpm. What a difference!

 

[70]

A lower ring and pinion is one of the best "bang for the buck" mods you can do to your car. The 4.3 is the same r&p that was in the Probe GT with the G-box. If you wanna raid a junkyard and get a PGT box, split the case (inspect the gears and forks while you're in there), put it back together with your Protege bellhousing and you have a much better gearbox. The individual ratios are better spaced and the r&p adds a lot of snap. 5th is still mathematically good for 130 or so mph, so that is not an issue (don't need a 6th gear).

I use that box with the Emco 4.8 r&p since on rallies we rarely get over 120mph, and that is still attainable at 7800rpm. What a difference!

Sweet! Nice junkyard hop up tip there...

And who really needs to go over 120 on the street?

 

[TheMAN]

OR, you can try very hard and not find a jspec mx-6 gearbox which has a LSD

 

[Equinox]

very interesting, go SR.

 

[Lurch]

OR, you can try very hard and not find a jspec mx-6 gearbox which has a LSD

really? What kind of LSD did it have? Helical torque biasing (Quaife style), centrifugal (MSP style), clutch (KAAZ), or viscous (Ford/Nissan goo style)? Very interested. The quaife and the MSP units have been very disappointing for us. I was going to custom machine a KAAZ Evo diff to accept the Mazda bearings, but if there is something out there already in a clutch or viscous, I'd be willing to give it a shot first.

Thanks,
Eric

 

[TheMAN]

I believe it's that viscous crap... I really would love to have a kaaz in my car... just too bad they don't make a direct bolt on one! maybe you can influence kaaz into making one since you are racing?

the LSD equiped G25M-R is only on the early 2nd gen MX-6 V6's (KL-ZE) in Japan

 

[Installshield 2]

I heard on the probetalk forum that they where torsen type Ed, but that was years ago...and every board has enough ignorance to piss one off...Anyway Wouldn't a viscous be overall just a pain in the ass to deal with for rallying? I know some guys use them, but more for the adjustability via the plates...but for an FWD, the viscous diffs rarely hold up as well as the mechanical and they need to be "regooed" pretty often...and they don't start biasing the torque until one wheel is already slipping...which I would think would make the car very unpredictable for drifting...I know they are tricky on the street...

FWIW what has been disappointing with the Quaife and MSP diffs? Are they not holding up? or are they simply not aggressive enough?

 

[Installshield 2]

Nevermind, I just thought about it a little...one wheel slipping first would make a little more sense in the dirt...Then both wheels would get the torque as the slide started...Sorry dude my experience only applies to pavement...

 

[Lurch]

Yeah, the limited slip isn't all that "limited." We are installing a spool now for gravel. Would like a viscous for ice.

Eric

 

[70]

I had heard Flyin' Protege was getting one from the people they use for Miata LSD....Guru, I think out of Australia. Gear type I think.

Memory fading, must get help...AAHH!

 

[PaulMP3]

Hmm, we already are a too high of an rpm @ 80mph...

and 1st gear is already short enough

werd. going 80 at 3500 is too high already.....