288/280 vs 280/272 cams.

[digger]

guys, more useable rpm then shorten the rear end ratio

[EthanolTurbo]

guys, more useable rpm then shorten the rear end ratio

Yeah I went to 3.91 for that purpose. Kinda feel like 4.1 makes the biggest difference due to the torque increase and faster revs but I chose 3.91 so it felt more "balanced" and OEM.

[duracellttu]

Yeah I went to 3.91 for that purpose. Kinda feel like 4.1 makes the biggest difference due to the torque increase and faster revs but I chose 3.91 so it felt more "balanced" and OEM.

Same. Everybody who has 4.1 gears says that first gear was way too short.

[0-60motorsports]

Yeah I went to 3.91 for that purpose. Kinda feel like 4.1 makes the biggest difference due to the torque increase and faster revs but I chose 3.91 so it felt more "balanced" and OEM.

Same here

[bigjae46]

Yeah I went to 3.91 for that purpose. Kinda feel like 4.1 makes the biggest difference due to the torque increase and faster revs but I chose 3.91 so it felt more "balanced" and OEM.

I wish I went with a 4.10 instead of a 3.91.

[CrisSilberGrau]

Honestly, with a good NA "build" i dont think id want more than 3.85. I'll be on track but I wont live there type of thing. Also I dont love paying the liberal tax on gas here in canadia so more revs and 550cc injectors cant be great on the pocket.

[EthanolTurbo]

Honestly, with a good NA "build" i dont think id want more than 3.85. I'll be on track but I wont live there type of thing. Also I dont love paying the liberal tax on gas here in canadia so more revs and 550cc injectors cant be great on the pocket.

550cc injectors don't use more fuel, an NA S54 can't even max them out. But if you're using factory injectors your build will never be able to run max power or even close to it because it lacks the injector overhead to do so. With cams, airbox, headers, bigger exhaust etc the stock injectors will always be an issue.

[bigjae46]

Honestly, with a good NA "build" i dont think id want more than 3.85. I'll be on track but I wont live there type of thing. Also I dont love paying the liberal tax on gas here in canadia so more revs and 550cc injectors cant be great on the pocket.

I've had a 3.62, 3.73 and a 3.91. I liked the 3.73 the best, it was a slight bump and didn't require extra shifts. A 3.91 does but the shift comes right before a braking zone. So I find myself bouncing off the rev limiter, might as well go with a 4.10 which I don't see any time it would cause another shift.

The 4k RPM pull out of a slower corner is significantly better with a 3.91 over a 3.73. Then if you have cams, shorter gearing puts you in the sweet spot for more time.

[Obioban]

The stock gearing is just so damn perfect that no part of me wants to change it.

On the street, it's not annoying on the highway in 6th. My e60 M5 with 3.91s (previous owner installed) is dramatically worse on the highway because of them.

On the track, it's just right so that 5th and 2nd are almost never needed, so I don't have any worries of money shifting. It's also perfectly ratioed so that you almost never need to shift mid corner on track-- in my old s50B32 e36 track car with 4.10s, I was always running out of RPM mid corner.

IMO BMW nailed it with the stock final drive ratio. I swapped out my LSD, but left that ratio alone.

[bimmerfan08]

Honestly, with a good NA "build" i dont think id want more than 3.85. I'll be on track but I wont live there type of thing. Also I dont love paying the liberal tax on gas here in canadia so more revs and 550cc injectors cant be great on the pocket.

This is the final drive ratio that the E9x M3 came with from the factory, right?

[Tbonem3]

depends dct or 6mt

6mt - 3.85
dct - 3.15

[empty]

550cc injectors don't use more fuel, an NA S54 can't even max them out. But if you're using factory injectors your build will never be able to run max power or even close to it because it lacks the injector overhead to do so. With cams, airbox, headers, bigger exhaust etc the stock injectors will always be an issue.

Where to get 550cc injectors?


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[Mike RT4]

The stock gearing is just so damn perfect that no part of me wants to change it.

On the street, it's not annoying on the highway in 6th. My e60 M5 with 3.91s (previous owner installed) is dramatically worse on the highway because of them.

On the track, it's just right so that 5th and 2nd are almost never needed, so I don't have any worries of money shifting. It's also perfectly ratioed so that you almost never need to shift mid corner on track-- in my old s50B32 e36 track car with 4.10s, I was always running out of RPM mid corner.

IMO BMW nailed it with the stock final drive ratio. I swapped out my LSD, but left that ratio alone.

Same here!

[EthanolTurbo]

Where to get 550cc injectors?


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Polmaxracing has them.

[Projecte46m3]

Polmaxracing has them.

These to be specific...

https://polmaxracing.com/index.php/product/bosch-ev14-52lb-550cc-0280158117-s54/