Evo3 gears

JackM · Jan 24, 2009

The intermediate 3rd is also the units final drive gear. They are under a lot of stress and can break if reused in a 500HP car. I would replace it so it will not be a worry. I would also use the EVOIII 3rd. The input cluster EVOIII 3rd has 1 less tooth than the OEM unit and I believe this makes it stronger. It is also double synchro which the OEM unit is not.

Jack

Black_ bullet · Jan 25, 2009

Hmm, it will be kind of hard to replace all of that on my current budget because I am also in the process of rebuilding the motor and trying to find a cheapo beater for a daily driver...

I will keep your information in mind. How crucial is the Evo 3rd in your opinion on a 500awhp car? I was hopeing just replacing the oem 3rd with a fresh one would be reliable.

Black_ bullet · Feb 7, 2009

Update, did anyone in this thread do evo gears yet?

Well I decided Im not going to do it. Im just going to replace my 3rd/4th gear with a fresh oem new one, and intermidiate shaft if thats really crucial to replace and Ill call it a day. Should be enough for whatever im trying to do with this car...

k1tty · Feb 7, 2009

I'm still too poor.. lol.. Hopefully when taxes come back...

Black_ bullet · Feb 12, 2009

Yea I decided Im not going to spend more money on evo gears.
Shep told me he doesnt think they are any stronger than the dsm gears, well at least not enough to warrent spending the extra money. Idk , Im not going to get into that.

I was considering just putting new oem 3rd and 4th gears with new syncros if I get any extra money during this engine build.
That should hold fine for my goals of 450awhp on 93 octane, which would likely be a little less than, or right around 400ft/lbs of torque, and my car only weighs 2600lbs so being lighter will help things last longer also...

If anyone else uses the Evo gears with success on a high powered car then that will be great though...

need2fix · Feb 12, 2009

You gotta remember that with longer gears, the shock load isn't as hard, whether the gears themselves are stronger, has to also account for that. The main benefit of the EVO 3 gears are the increased rpms for the same mph, keeping you in the powerband better.

twicks69 · Feb 13, 2009

need2fix said:
You gotta remember that with longer gears, the shock load isn't as hard, whether the gears themselves are stronger, has to also account for that. The main benefit of the EVO 3 gears are the increased rpms for the same mph, keeping you in the powerband better.

You do know that the Evo 3 gears are SHORTER than stock gear ratios.

As well, the benefit of a shorter gear ratio would be beneficial for certain applications only -- such as a high-revving 2.0-2.2L setup going over 9000rpms on a large turbo and over 150mph in the 1/4.

The reason I say "certain applications only" depends on your powerband range, goals for the car, etc. In my circumstance, running a large turbo on a 2.3L where my redline is at 8400-8500rpms and running 26" slicks, using the Evo 3 3rd/4th gearset, I would be losing 4 mph in 3rd gear and 5mph in 4th gear. It would essentially require me to rev out to 9000rpm just to get through the traps at 161mph, whereas it would be around 8500rpm with the stock 4th gear ratio. Last time I was able to get down the track with 641AWHP, I was already going through the traps around 8000rpm at 148mph or so. I am expecting 155-160 traps with the new setup very easily (as long as things hold together...).

If I was running a larger diameter slick, or a lower final drive gear ratio than stock (4.929); lets say a 4.4 final drive...I could achieve my goals a bit easier while not having to run as high as an rpm.

It still all comes down to each person's goals....

Personally, I will be sticking with my stock 3rd/4th gear ratios; or change over to a dogbox in the future.

JackM · Feb 14, 2009

The closer the gear ratio the less shock loading they will see when you shift, IMO. I think that is another good reason to run the EVOIII stuff. The HD 3-4 are also very good gears, but I like the closer ratio and double synchros for what I do. Like said above, personal pref is key...

Jack

Black_ bullet · Feb 15, 2009

twicks69 said:
You do know that the Evo 3 gears are SHORTER than stock gear ratios.

As well, the benefit of a shorter gear ratio would be beneficial for certain applications only -- such as a high-revving 2.0-2.2L setup going over 9000rpms on a large turbo and over 150mph in the 1/4.

The reason I say "certain applications only" depends on your powerband range, goals for the car, etc. In my circumstance, running a large turbo on a 2.3L where my redline is at 8400-8500rpms and running 26" slicks, using the Evo 3 3rd/4th gearset, I would be losing 4 mph in 3rd gear and 5mph in 4th gear. It would essentially require me to rev out to 9000rpm just to get through the traps at 161mph, whereas it would be around 8500rpm with the stock 4th gear ratio. Last time I was able to get down the track with 641AWHP, I was already going through the traps around 8000rpm at 148mph or so. I am expecting 155-160 traps with the new setup very easily (as long as things hold together...).

If I was running a larger diameter slick, or a lower final drive gear ratio than stock (4.929); lets say a 4.4 final drive...I could achieve my goals a bit easier while not having to run as high as an rpm.

It still all comes down to each person's goals....

Personally, I will be sticking with my stock 3rd/4th gear ratios; or change over to a dogbox in the future.

I think that would be smart, if I were you thats what I would've done a long time ago with that type of power.
But like you told me before its only good as long as your not breaking dog boxes too.

The Evo3 gears would probably be beneficial on my car since I dont plan to make anymore power than what could take me to a 128-130 trap speed which should only be around 450awhp on my vehicle weight, and Im revving to 8500. The reason I decided not to go with the evo gears though is because of lack of funds, and a desire to finish up/complete my endeavors of building this car as I am not trying to constantly blow money away in this dsm thing. Im just trying to reach a certain point and be happy with it...

Evo3 gears

JackM

Black_ bullet

Black_ bullet

k1tty

Black_ bullet

need2fix

twicks69

JackM

Black_ bullet

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