Can you change gear ratio's ?

[Razor_nl]

I was quite surprised when I couldn't find any good thread about this.

I was wondering, is it possible to change the gear ratio's on a 2G FWD?
The reason I'm asking this is because I have had other cars which made more speed at less rpm and I liked this a LOT.
I care most for 1st and 2nd and 5th gear. 1st and 2nd for acceleration, now I really have the feeling I'm making a lot of rpm but not gaining any real speed. And 5th gear for highway cruising/ fuel saving. I'm now driving ~3500rpm at (legal) highway speed and I would love to see this go down somewhere to ~3000. I allready took a larger size tires but this didn't make a noticable change.
I know it's not a smart idea to change just a few gears because they will be too close or too far from each other, so then a change to all gears.

At the moment I have almost 300hp and I can hit the rev limiter in 5th. I will go over 300hp for sure in a short period of time with some extra incoming mods, so that's not the problem at all.

So can you guys give any information about this? Aftermarket products, trannies (or parts) from other cars, or anything else? Or maybe reasons why this can't be done (since I haven't seen it done before yet)

Thanks!

 

[pj91gsx]

The gear ratio is in the center differential of the transmission. you can change it, but idk if you could make you rpms go down but probably go up if you have the center differential from a jdm trans.

 

[xi Talon ix]

i have a JDM Galant VR4 tranny in my car and im crusing at highway speeds (65-70) at 3k RPM.

 

[Razor_nl]

i have a JDM Galant VR4 tranny in my car and im crusing at highway speeds (65-70) at 3k RPM.

And I have a JDM GVR4 engine in my car
Anyway, you own a 1G, and as far as I know the 1G tranny won't fit the 2G, so the GVR4 won't fit either... right ?

And by the way I don't know if the term "gear ratio" is the right one, I'm not very well known with this. I've also heard something about changing the part that brings the engine/tranny rotation to the wheels and changing it's size will change the speed per rpm without changing gears, but I'm not sure if this is true or what it's called.

 

[1992awdlaser]

The easy way to change your rpm at a certain speed would be to change the overall diameter of your tires.

 

[pj91gsx]

I've also heard something about changing the part that brings the engine/tranny rotation to the wheels and changing it's size will change the speed per rpm without changing gears, but I'm not sure if this is true or what it's called.

center diff is where the gear ratio is. What gear ratio is your transmission xi Talon ix? some of the jdm trannys are the same as the ratio of the dsms that we drive in the US.

 

[bastarddsm]

he is FWD, no center diff. You might be able to find taller gears, its possible a ring and pinion from a GGSX might fit. I would call Jacks Transmissions, SHEP, or TRE. They'll know for sure.


EDIT:


check this out http://www.vfaq.com/mods/Trannies.html The Gallant GSX gears are 3.10's and yours are 3.43's. Idunno if they will fit. I know the ring gear will fit the diff, but I'm not sure of the pinion.

 

[Boost92awd]

They make transmission with 10% taller 5th gears. Call up jacks,shep,or tre. That would be the best thing to do. You will have your answers in minutes.

 

[bastarddsm]

That would also work, but he is looking for a taller 1st and 2nd. For that he needs a different ring and pinion.

 

[4g63Powered]

Why do you want a taller first gear? I'd imagine that doing that would make it a lot more susceptible to bogging down.

 

[bastarddsm]

being FWD it will help launching, less toruqe = less wheel spin.

 

[Razor_nl]

Yes basicly that.
I can't do fck all at 1st, not much more at 2nd. I know I should be getting a LSD.

It's a bit to have a bit more chance against tiny hatchbacks at stoplight races. They piss all over me. If it's before a highway or so, I piss double back at them when going to 3rd 4th gear, but that won't work everywhere.
I get way too much wheelspin to use my power at launch. And also when driving normal, it really feels like I have to shift allready before I even made some speed (figuraly) It's not a worn clutch or whatever by the way, just the size of the gears.

So ye my ideal situation would be to have all the gears bigger and have a LSD put it at the same time.

 

[98eclipsekidd08]

Yes basicly that.
I can't do fck all at 1st, not much more at 2nd. I know I should be getting a LSD.

It's a bit to have a bit more chance against tiny hatchbacks at stoplight races. They piss all over me. If it's before a highway or so, I piss double back at them when going to 3rd 4th gear, but that won't work everywhere.
I get way too much wheelspin to use my power at launch. And also when driving normal, it really feels like I have to shift allready before I even made some speed (figuraly) It's not a worn clutch or whatever by the way, just the size of the gears.

So ye my ideal situation would be to have all the gears bigger and have a LSD put it at the same time.

haha that sucks, im at 20psi on a big evo316g that made your power and im on stock tires with no wheel spin. they get lose for a sec and grab. are you trying to dump the clutch at these light?

 

[->PrOjEcTGS<-]

I know you can put an AWD 5th gear in it. The stock FWD 5th ratio is .741 and the AWD is .66 which is taller. Not sure you can do much with 1st or 2nd in the FWD's because I'm sure the shafts are made different. AWD's have the luxury of the taller geared EVO III parts.

 

[thatblondechik]

You should't be catching any flack from other import owners if you have 300hp. In all honensty I don't think you need a taller gear...just work on your launch technique. Don't just dump the clutch, slip it just until you feel the wheels hook up then you should be good to go.

 

[Jeff99GS]

Yes basicly that.
I can't do fck all at 1st, not much more at 2nd. I know I should be getting a LSD.

It's a bit to have a bit more chance against tiny hatchbacks at stoplight races. They piss all over me. If it's before a highway or so, I piss double back at them when going to 3rd 4th gear, but that won't work everywhere.
I get way too much wheelspin to use my power at launch. And also when driving normal, it really feels like I have to shift allready before I even made some speed (figuraly) It's not a worn clutch or whatever by the way, just the size of the gears.

So ye my ideal situation would be to have all the gears bigger and have a LSD put it at the same time.

Get BETTER Fatter Tires....Look at the Compound of the tires...I bet your tires are ROCK hard....you want a softer tire. Like a Goodyear Eagle. A LOT of these new Low profile Korean tires are made with silica so they last longer but they are almost like plastic

Buy some goodyears or BFG's with the 35,000 mile warranty and i bet that will make a huge difference.
Look Out for High milage rated tires...like if it has a 80,000 mile tread warranty its gunna be a HARDER compound tire

If it only has a 35,000 mile warranty it will be a softer tire!
They will wear out faster but you will have hella grip

Or Plan B....awd conversion!

 

[spoonman]

The only way to extremely shorten your gears and accelerate quicker off the line is to change your axle ratio. The axle ratio is the ratio of how many times the pinion gear rotates compared to how many times the ring gear on the differential rotates. The ratio is more widely discussed in RWD cars because the gears are more interchangeable. The higher the axle ratio the more turns of the pinion gear are need to rotate the ring gear, and with a higher ratio you have higher rpms going to the tires resulting in faster acceleration with more torque. The higher ratio also puts more stress on the axles and diff and the car will have a harder time maintaining traction off the line. Now on our transmissions It is very hard to find a higher axle ratio that will let you accelerate faster because it is hard to swap out and no one makes interchangeable gears, so you have to swap in an AWD tranny and make it fit a FWD which will give you a much higher axle ratio but also lower your top speed and make your fifth gear highway rpm's higher.

 

[Razor_nl]

You should't be catching any flack from other import owners if you have 300hp. In all honensty I don't think you need a taller gear...just work on your launch technique. Don't just dump the clutch, slip it just until you feel the wheels hook up then you should be good to go.

But won't this cause my clutch to be worn after a few launches ?
Don't get me wrong, I really do understand that going fast and all causes more dmg and makes parts be worn faster. But launching all the time with a slipping clutch, won't it fry the discs in 2 launches ?

I did think of an AWD conversion but it's not doable because the GSX was never sold here (basicly not in entire europe), so I would have to find a dead GSX from USA and get it here etc... all too expensive.

And I'm using Falken FK452 tires, 225/45/18 (while staying stock size would be 225/40/18)

@Spoonman, you're basicly explaining what I do NOT want Good explanation, but I'm looking for info for larger gears, lower torque, more traction, to keep wheels from spinning and to gain higher speeds per gear, and larger 5th for highway usage.

 

[Jeff99GS]

Get a 26" or 27" tire on that rim and pray that your axles dont snap

 

[dsm-onster]

Don't waste your time cracking open your transmission, just to put a taller gear on the differential. You need more traction, not less torque. An LSD is what you need. If you want less torque off the line, then lift.

 

[thatblondechik]

But won't this cause my clutch to be worn after a few launches ?
Don't get me wrong, I really do understand that going fast and all causes more dmg and makes parts be worn faster. But launching all the time with a slipping clutch, won't it fry the discs in 2 launches ?

Honestly, yes it will wear your clutch faster, but a good sturdy clutch can still last a hell of a long time. I have an ACT 2600 and I have lauched it, sliped it, dumped it, rode it , etc... and 10k later...I have yet to feel it slip in gear.

If you're running a stock clutch, then no, you probably shouldn't be slipping or launching. But a good aftermarket clutch will take one hell of a beating before it gives out.

 

[turboglenn]

I didn't read teh wole thread, but you can order taller 5th gears from TRE and just pull the end case off teh tranny, slap the new gears in and have a lot taller 5th gear in about 1/2 hour or so and for only a couple hundred max ( i think i was quoted 150 or soimething), the best part is you can change back in another 1/2 hour if you need to or dont' liek the tall gearing for daily in town driving. I plan on getting teh 15% taller one as soon as i'm done with a few other things so i can get a little better mileage at 80mph on the interstate.

AS for tire size changes, it is prettye ffective. I went to a 26x9.5'' slick the last season i dragged the car and it helped with first and second gear a bit (although i still spun really hard on teh peg-leg stock diff) But teh one place it hurt me was on teh 2-3 shift, with a large laggy trbo you could NOT let off the gas at all on 26'' tires, it would bog soemthign horrible if you didn't shift it just perfect. this year i'm going back to the 24.5's as that's closest to stock. If you want some quick accell from an underpowered car throw some 22's on it the bumper will drag when you hit teh brakes if you are lowered at all, but me and another guy shared a set of 22's a long time ago and my car rapped out fast as hell... but i spun them way too much

 

[turboglenn]

At the moment I have almost 300hp and I can hit the rev limiter in 5th. I will go over 300hp for sure in a short period of time with some extra incoming mods, so that's not the problem at all.

So can you guys give any information about this? Aftermarket products, trannies (or parts) from other cars, or anything else? Or maybe reasons why this can't be done (since I haven't seen it done before yet)

Thanks!

Holy hell!!!! Rev limiter in 5th??? my god i hope you're on the autobhan or a track..that's got to be hauling ass...what does your speedometer say at that RPM in 5th? I had mine up to 156 indicated but i have a 8k RPM limiter and was no where near it. I think i was at around 6800 - 7k though, it was all too fast and spooky to pay too much attention to anything but the road.

I also ruined the front brakes, and shook about every ball joint in the front end into oblivion in the few minutes it took me to haul back down to normal speed from there.

 

[Twistaye]

Autobahn ftw, he is in Europe so I'm guessing that's where he was. And I found a dead GSX totally gutted but still had tranny/xfer case/gas tank/axles over here in Germany at a junkyard by Ramstein. They crushed it but there are a lot of GSX's and GST's over here in Germany. Almost had a 97 gB but the a-hole sold it before I could go look at it. You don't have to find a dead one in the states and ship it over, there are plenty of americans who've brought their GSX/TSi AWD over and ended up breaking down or bought a BMW/Mercedes and left their DSM. Check in the Ramstein/Kaiserslautern/Wiesbaden/Baumholder/Grafenwohr area and I'll bet you find an AWD DSM. Just a heads up, of course I don't know if you're in Germany or not so just a suggestion

 

[Razor_nl]

@ thatblondechik : ok thats good to know. Got an ACT 2100 myself so I hope it can also hold some damage for a while

@ turboglenn: Ok I'll look into that. Thanks. I live in the Netherlands. They've built a fresh new highway next to my country's major airport (Schiphol Amsterdam). It's straight, long, places where people enter or leave the highway, no turns, nothing.. just a long piece of perfectly straight highway. I was there some months ago at like 4 AM in the morning and there was absolutely NOBODY around.. so well ye... curiosity won and I tried. Rev limiter is at 7850, I made about 265KM/H. (which is about 165MP/H) As soon as I heard the rev limiter kick in I released the gas pedal, it was a one time try to see what my car can do.

@ twistaye : well I live in the Netherlands, so Germany aint undoable far from my. My car originaly came from Germany aswell. So this is just an awesome piece of information that you gave me! I'll definately look into it.