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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Any downsides with auto 335i in terms of performance mods?



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      07-04-2009, 12:26 AM   #1
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Any downsides with auto 335i in terms of performance mods?

I am wondering if there are any downsides to owning an auto when it comes to engine modifications. Are there certain mods you can't do? Is there less potential in terms of hp/tq? Any info. is appreciated. Thanks!
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      07-04-2009, 12:38 AM   #2
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If you are planning to get alot hp/tq from your turbo engine, your auto gearboxe may begin to slip, overheat and fail eventually.
don't know how much tq can the ZF gearboxes handle.
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      07-04-2009, 12:42 AM   #3
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I'm not too sure myself but I think you are fine with the auto gear box with the stock turbos with the ecu reflashes. I'm pretty sure you will need to change it out once u get some aftermarket turbos
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      07-04-2009, 12:44 AM   #4
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youre fine if you plan to stay on stock turbos

terry's 135 w/ auto is at like 450whp
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      07-04-2009, 01:04 AM   #5
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I thought the auto can handle more hp/torque than the manual. i thought i read that somewhere. Auto's are faster anyway
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      07-04-2009, 02:13 AM   #6
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The autos are good on whatever you can throw at it with the stock turbos. They tend to drop hp at high rpms and that helps to make it safer to shift with an auto.
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      07-04-2009, 02:43 AM   #7
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Quote:
Originally Posted by fotios335i View Post
I thought the auto can handle more hp/torque than the manual. i thought i read that somewhere. Auto's are faster anyway
no, manuals can handle more tq/hp i think. Auto's are faster but boring
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      07-04-2009, 11:06 AM   #8
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Thanks for the info all. I am use to the world where autos are a second slower than their manual counterparts and where there are mods for manuals but limited mods for autos. Since it seems like the auto and manual are pretty close in terms of performance, I am looking at the autos again. I don't mind the manual (I have been driving one for the past 2.5 yrs), I just don't want to deal with replacing the clutch in the future.
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      07-04-2009, 11:10 AM   #9
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Quote:
Originally Posted by cgtsx07 View Post
...I just don't want to deal with replacing the clutch in the future.
FWIW, a clutch is significantly cheaper to replace than an auto trans.
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      07-04-2009, 11:21 AM   #10
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Before this turns into another auto vs. manual thread, I will say that I have read that the manual is more capable of handling extra torque. Please don't turn this into a "which is faster" thread.
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      07-04-2009, 01:56 PM   #11
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Quote:
Originally Posted by NiVeDh View Post
Before this turns into another auto vs. manual thread, I will say that I have read that the manual is more capable of handling extra torque. Please don't turn this into a "which is faster" thread.
auto's faster .

build boost at the line, shift faster; more than makes up for the power lost through the drivetrain.

sorry, had to say it.
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      07-04-2009, 02:26 PM   #12
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Quote:
Originally Posted by mfear View Post
auto's faster .

build boost at the line, shift faster; more than makes up for the power lost through the drivetrain.

sorry, had to say it.
Well it depends on how good the driver is behind the wheel on the one with manual , but anyway steptronic it aint no dct so i wouldn't really brag about it being faster.
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      07-04-2009, 02:35 PM   #13
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read somewhere the auto can handle more torque than the manual, which is why the bmw performance engine upgrade for the 335i auto gains more tqs over the manual
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      07-05-2009, 09:49 AM   #14
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Someone correct me if i'm wrong, but I thought the 335d only comes with auto because the manual couldn't handle the torque.
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      07-05-2009, 10:04 AM   #15
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Quote:
Originally Posted by seanl View Post
FWIW, a clutch is significantly cheaper to replace than an auto trans.
I'm not disagreeing with you, but if you know the prices please let us know...
How much does the clutch clost to replace??
How much does the auto tranny cost to replace??
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      07-05-2009, 10:08 AM   #16
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Quote:
Originally Posted by sd390r View Post
youre fine if you plan to stay on stock turbos

terry's 135 w/ auto is at like 450whp
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      07-05-2009, 10:12 AM   #17
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Quote:
Originally Posted by matts335 View Post
Someone correct me if i'm wrong, but I thought the 335d only comes with auto because the manual couldn't handle the torque.
that's what I heard
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      07-05-2009, 11:11 AM   #18
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Quote:
Originally Posted by Joyrida View Post
read somewhere the auto can handle more torque than the manual, which is why the bmw performance engine upgrade for the 335i auto gains more tqs over the manual
Is the BMW stock performance upgrade available in the US yet??

sorry to Jack..
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      07-05-2009, 11:12 AM   #19
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Steptronic FTW!
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      07-05-2009, 11:15 AM   #20
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Quote:
Originally Posted by Dr_Dirt View Post
I'm not disagreeing with you, but if you know the prices please let us know...
How much does the clutch clost to replace??
How much does the auto tranny cost to replace??
A domestic tranny can cost you around 2k. Now multiply that times 3 because it has a roundel on it and you should come close to the price.
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      07-05-2009, 11:22 AM   #21
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Auto all the way

The same performance mods apply for the 335 auto as for the manual.
Start with JB3 and you will not ask your initial question again.

I am on my second auto 335. My daily drive is a manual.
But if i want to race auto is the only choice for me.
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      07-05-2009, 01:07 PM   #22
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If you want to compare Auto vs manual reliability you need to look at it like this

Manual
Clutch replacement if it breaks
Flywheel cost
Potential to break rear end with slicks / abuse
Potential to break / wear out synchros
It is harder / more expensive to upgrade manuals and you have to factor in the strength of the diff / axles /driveshaft etc. An auto imposes a lot less stress on the diff / axles and driveshaft since it applies torque smoothly compared to a manual driven agressively.

Auto
Yes you can burn up an auto if you abuse it enough. If you do why replace when you can rebuild with stronger components. At this time there have been virtually no failures of the auto trans. Maybe after these cars get older there will be failures and at that point people will identify the fixes and the safe limits. Meanwhile i would suggest getting the auto oil replaced at atleast 30 - 40 m intervals even though BMW claims its a lifetime fill. You can always send the oil for analysis to show wear on the clutch packs. Highly recommended for people with higher mileages.

Harry
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