BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      07-17-2020, 05:19 PM   #1
bluemsp4
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N54 or n55 for Autocross?

Looking to buy a 135i and trying to figure out which is best for both daily driving and the occasional autocross?
Wife says it has to be auto, so couple of things I was wondering - what would be better, n54 or n55. I know the n55 has the dct, so out of box it would probably be quicker shifts, but I've seen a lot of good things on the xHP flash for the n54. From everything I've read seems like the n54 is better to mod but both are good. Also read the n55 tends to be more reliable.
Not trying to do crazy mods so something around 350-400whp(max). Would be doing full bolt-ons, tune, coilovers, wheels and tires.

What does everyone think is the best balance between reliability and performance for daily and autoX. What transmission would be best?

Also if anyone has any buying tips or things to look out for other than the big ones let me know.
Thanks!
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      07-17-2020, 05:49 PM   #2
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Only here suggesting you keep the 'occasional' auto-x expectations grounded....a bit of an underdog in either F Street or STU (likely landing spot if going full bolt on). It's a great car to daily - good luck with your shopping.
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      07-18-2020, 06:50 PM   #3
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Thanks for the suggestions. Just looking to have some fun and spirited driving. Was wondering which auto trans would be the better option and more durable.
Also if the n55 was worth spending a couple more thousand dollars to get the reliability?
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      07-19-2020, 08:48 PM   #4
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The N55 develops torque quicker down low in the rev range, so that might help in an autox. The old auto in the N54 is probably "stronger" if you were going to build big power, but that's hard to use in an autox situation.

I would spend the extra little bit to get the reliability to be honest...
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      07-20-2020, 07:42 PM   #5
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N55/DCT is more fun than N54/6HP.
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      07-22-2020, 11:48 AM   #6
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My first hand experience driving cars with both engines is that the N55 is more responsive. N54 will make more power tuned though. Not sure how that impacts the stopwatch in an autocross. The only N54's I ever see are either novice drivers or in 1M cars so not much of a real-world comparison can be made. I have heard people complaining about overheating in N54's at autocross. I don't see how that is possible but it's just something anecdotal I've come across.

The engine will have less to do with your success in autocross than your driving will that's for sure.
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      07-23-2020, 11:52 AM   #7
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N55/DCT is more fun than N54/6HP.
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      07-25-2020, 01:15 PM   #8
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Quote:
Originally Posted by SKI-R View Post
Only here suggesting you keep the 'occasional' auto-x expectations grounded....a bit of an underdog in either F Street or STU (likely landing spot if going full bolt on). It's a great car to daily - good luck with your shopping.

This post is spot on. The 135 is a great daily driver but outgunned when put against the cars in its class. If you do decide to get more competitive you will have to figure out a way to contain the roll up front and keep the front tires from rolling over. Honestly I would go with a 3er for a/x just because you can put more tire on that car.
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      07-26-2020, 04:38 PM   #9
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The better turbo engine for autox is the one with less lag, a lower boost threshold, and and a broader power band. It's mostly about area under the curve and throttle response. Peak power is largely irrelevant.
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      07-28-2020, 10:22 AM   #10
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N54 + 6MT is much more fun, hard to get these cars competitive thankfully they now have a class for those that modify and want to stay on 200TW
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