Gen 2 Rear Diff Durability

[BioRebel]

Originally Posted by vindiesel

I don’t understand people wanting to do a mod that has no return investment or depreciating on sale of car to worry about a few mpgs less of fuel a year and a couple 100 dollars of cost of fuel consumption added for “more torque per gear acceleration” its counterintuitive. You mod for fun… gas consumption is negligible and shouldn’t be a factor in a sports car.

What’s your threshold a 1.875mpg loss? lol you get what I’m saying

The stock gearing to me is perfect for city and hwy balance. 4.3 would be fun for tight curvy roads and annoying on the highway especially with an exhaust.

I mean, idk what to tell you other than a bunch of other cars in this segment can pretty easily get 30mpg@80mph highway and this is one of the few that can't. Paired with a 10 gallon tank and I already feel like I'm constantly filling it up. It's not a big bill, its just the frequency.


Either way, I'm asking because its a mod that a few people have said is a good cheap mod to give the car a bit more torque. But I've never seen what the impact is on mpg. And tbh I'd just like to know.



If I had another car and this was a weekend driver then yeah I'd probably just put it on.


Maybe I'm just used to my old cooper S getting like 30+mpg @ 80mph with a 14 gallon tank.

[norcalpb]

Originally Posted by Lelandjt

It's not just MPG. An engine that's spinning at 3500 when highway cruising has more vibration, noise, and wear. It deters high speed cruising. In my STi I'd gradually back off to 70 cuz it just didn't "feel" like it wanted to go 80 for hours. A 4 cylinder will never lope along at 80mph like a Corvette but something closer to 2500rpm is a lot more pleasent when power isn't needed and you're trying to comfortably cover miles. You can always downshift for uphills and passing.

But yes, I do want the lightest 17x7.5 43mm wheels, though might settle for the GR accesory wheels, and when the stock tires wear out I'm going to consider rolling resistance ratings (and weight) on replacements. I suspect low rr tires would be quieter as well.

It would be nice if someone made a longer 6th gear…but alas no one does.

[dragoontwo]

Originally Posted by norcalpb

It would be nice if someone made a longer 6th gear…but alas no one does.

I would buy one if they did. Can't be much more difficult that swapping the 5-6 cluster gear in the STI 6 speed that I've done twice before.

[vindiesel]

Originally Posted by BioRebel

I mean, idk what to tell you other than a bunch of other cars in this segment can pretty easily get 30mpg@80mph highway and this is one of the few that can't. Paired with a 10 gallon tank and I already feel like I'm constantly filling it up. It's not a big bill, its just the frequency.


Either way, I'm asking because its a mod that a few people have said is a good cheap mod to give the car a bit more torque. But I've never seen what the impact is on mpg. And tbh I'd just like to know.

Oh to keep it on topic… put 5:12 gearing in it top out at 100mph… 20mpg


If I had another car and this was a weekend driver then yeah I'd probably just put it on.


Maybe I'm just used to my old cooper S getting like 30+mpg @ 80mph with a 14 gallon tank.

Low weight small tank

Drive 15k a year at 26mpg at 75mph (which I have netted) 3.50 gallon is 2019.23$

Drive 15k a year at 30mpg at 80mph 3.50 gallon is 1750$

2019.23 - 1750.00 269.23$ \12 months = 22.54$ a month difference

If you can’t offset financially 22.54$ a month then you probably can’t afford the car or many other luxuries.

If you do the math and break it down monthly then it seems like a ridiculous moot point when I hear anyone with a “non essential depreciating luxury that was purchased as a want not a need” complain about gas mileage or inconvenience of stopping at a gas station more.

The whole dealeyo with the brz is the straight ignorant premise well it’sa 4 cylinder.. look at the power it is making and the compression ratio and to still net near 30 and for some over 30mpg (60mph) is stellar by any standard. Enjoy these moments before it’s all mundane electric plastic bags on auto pilot.

[norcalpb]

Originally Posted by vindiesel

Low weight small tank

Drive 15k a year at 26mpg at 75mph (which I have netted) 3.50 gallon is 2019.23$

Drive 15k a year at 30mpg at 80mph 3.50 gallon is 1750$

2019.23 - 1750.00 269.23$ \12 months = 22.54$ a month difference

If you can’t offset financially 22.54$ a month then you probably can’t afford the car or many other luxuries.

If you do the math and break it down monthly then it seems like a ridiculous moot point when I hear anyone with a “non essential depreciating luxury that was purchased as a want not a need” complain about gas mileage or inconvenience of stopping at a gas station more.

The whole dealeyo with the brz is the straight ignorant premise well it’sa 4 cylinder.. look at the power it is making and the compression ratio and to still net near 30 and for some over 30mpg (60mph) is stellar by any standard. Enjoy these moments before it’s all mundane electric plastic bags on auto pilot.

It seems like that works out for you, but for me:

I drive 20k miles/yr and 91 octane at my local California gas station is $5.36/gallon.

20,000 miles at 26mpg = 769 gallons = $4,122
20,000 miles at 30mpg = 666 gallons = $3,570

Yearly savings of $552/12 = $46/mo savings.

I’m not nearly rich enough to consider $46/mo savings to be “nothing” .

We’re just tryna keep the RPMs down, irrespective of the compression ratio, how many cam shafts it has etc.

[vindiesel]

Originally Posted by norcalpb

It seems like that works out for you, but for me:

I drive 20k miles/yr and 91 octane at my local California gas station is $5.36/gallon.

20,000 miles at 26mpg = 769 gallons = $4,122
20,000 miles at 30mpg = 666 gallons = $3,570

Yearly savings of $552/12 = $46/mo savings.

I’m not nearly rich enough to consider $46/mo savings to be “nothing” .

We’re just tryna keep the RPMs down, irrespective of the compression ratio, how many cam shafts it has etc.

I was waiting for cali to pop in ��

Cost of living is on another whole other level over there.

If you paid msrp out there then your lucky for a brz.

Either way you get my point. Luxury >necessity
Bought it to enjoy it>feather foot

I’ll shut up now… to stay on topic put 4:56 gearing top out at 110mph… 20mpg and chirp shifting into 4th gear

[CaptainFenderbaum]

Originally Posted by vindiesel

Low weight small tank

Drive 15k a year at 26mpg at 75mph (which I have netted) 3.50 gallon is 2019.23$

Drive 15k a year at 30mpg at 80mph 3.50 gallon is 1750$

2019.23 - 1750.00 269.23$ \12 months = 22.54$ a month difference

If you can’t offset financially 22.54$ a month then you probably can’t afford the car or many other luxuries.

If you do the math and break it down monthly then it seems like a ridiculous moot point when I hear anyone with a “non essential depreciating luxury that was purchased as a want not a need” complain about gas mileage or inconvenience of stopping at a gas station more.

The whole dealeyo with the brz is the straight ignorant premise well it’sa 4 cylinder.. look at the power it is making and the compression ratio and to still net near 30 and for some over 30mpg (60mph) is stellar by any standard. Enjoy these moments before it’s all mundane electric plastic bags on auto pilot.

You missed the main point

Paired with a 10 gallon tank and I already feel like I'm constantly filling it up. It's not a big bill, its just the frequency.

If you had to rely on the BRZ for a longish-ish highway commute, the fillup frequency could get old in a hurry.

[nextcar]

Originally Posted by vindiesel

I was waiting for cali to pop in ��

Cost of living is on another whole other level over there.

If you paid msrp out there then your lucky for a brz.

Either way you get my point. Luxury >necessity
Bought it to enjoy it>feather foot

I’ll shut up now… to stay on topic put 4:56 gearing top out at 110mph… 20mpg and chirp shifting into 4th gear

Love my 4.56 gears, but I topped out at 115 @ the Autoclub Speedway "Roval".

Ambient temp was over 95F, stock motor/tune and expensive but 91 octaine gas. Smiled the whole day. And yes, 4th gear is a monster on a cloverleaf onramp!

[CSG Mike]

Originally Posted by Lelandjt

It's not just MPG. An engine that's spinning at 3500 when highway cruising has more vibration, noise, and wear. It deters high speed cruising. In my STi I'd gradually back off to 70 cuz it just didn't "feel" like it wanted to go 80 for hours. A 4 cylinder will never lope along at 80mph like a Corvette but something closer to 2500rpm is a lot more pleasent when power isn't needed and you're trying to comfortably cover miles. You can always downshift for uphills and passing.

But yes, I do want the lightest 17x7.5 43mm wheels, though might settle for the GR accesory wheels, and when the stock tires wear out I'm going to consider rolling resistance ratings (and weight) on replacements. I suspect low rr tires would be quieter as well.

I have the perfect 17x7.5" wheel for you.

14.10 lbs each. TWS T66-F.

You don't want to be cruising at 2500RPM with an engine this high in compression; that's how you lug the engine without realizing it, and effectively makes cruise control useless. Can you address it yourself? Sure, but from the factory, they have to take into account all use cases, not just yours!

[CSG Mike]

Originally Posted by nextcar

Love my 4.56 gears, but I topped out at 115 @ the Autoclub Speedway "Roval".

Ambient temp was over 95F, stock motor/tune and expensive but 91 octaine gas. Smiled the whole day. And yes, 4th gear is a monster on a cloverleaf onramp!

100% stock engine

[BioRebel]

Originally Posted by vindiesel

Low weight small tank

Drive 15k a year at 26mpg at 75mph (which I have netted) 3.50 gallon is 2019.23$

Drive 15k a year at 30mpg at 80mph 3.50 gallon is 1750$

2019.23 - 1750.00 269.23$ \12 months = 22.54$ a month difference

If you can’t offset financially 22.54$ a month then you probably can’t afford the car or many other luxuries.

If you do the math and break it down monthly then it seems like a ridiculous moot point when I hear anyone with a “non essential depreciating luxury that was purchased as a want not a need” complain about gas mileage or inconvenience of stopping at a gas station more.

The whole dealeyo with the brz is the straight ignorant premise well it’sa 4 cylinder.. look at the power it is making and the compression ratio and to still net near 30 and for some over 30mpg (60mph) is stellar by any standard. Enjoy these moments before it’s all mundane electric plastic bags on auto pilot.

Pretty sure I said it wasn't a financial problem but a "I'm always filling up a sippy cup" problem.

Originally Posted by CaptainFenderbaum

If you had to rely on the BRZ for a longish-ish highway commute, the fillup frequency could get old in a hurry.

I'm fortunate that I can (and do) take public transit for work. (Love driving, HATE driving in traffic especially with a stick)
But yeah, it would mostly be a road trip issue. But I've made due with using cruise control.

[OkieSnuffBox]

Originally Posted by norcalpb

It seems like that works out for you, but for me:

I drive 20k miles/yr and 91 octane at my local California gas station is $5.36/gallon.

20,000 miles at 26mpg = 769 gallons = $4,122
20,000 miles at 30mpg = 666 gallons = $3,570

Yearly savings of $552/12 = $46/mo savings.

I’m not nearly rich enough to consider $46/mo savings to be “nothing” .

We’re just tryna keep the RPMs down, irrespective of the compression ratio, how many cam shafts it has etc.

If $46/month is not "nothing", why did you buy a car that gets crap mileage?

[OkieSnuffBox]

Originally Posted by CSG Mike

I have the perfect 17x7.5" wheel for you.

14.10 lbs each. TWS T66-F.

You don't want to be cruising at 2500RPM with an engine this high in compression; that's how you lug the engine without realizing it, and effectively makes cruise control useless. Can you address it yourself? Sure, but from the factory, they have to take into account all use cases, not just yours!

He doesn't even have the car. He just constantly starts thread about shedding weight and MPG. And telling us a 4 banger needs a 7 speed gearbox.

[bcj]

Who's got 80 limits these days?
Last I went through Montana it was snowing and freezing.
I think Co & Nm had a 75 limit, but that was before the FR-S.