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      02-17-2014, 01:14 AM   #1
Bakks
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Considering 135i

I am toying with the idea of buying a manual N54 135i. They seem to be fantastic value for money, and with huge modification potential. I currently have a Mk 6 GTi which I like, but the 135i seems a bit more special....

My car does quite a few kilometers (~25k per annum, albiet mostly highway). What is the fuel economy like? Does it get better with a tune? And reliability? It seems the biggest issues seem to be the HPFP, which should have been replaced under warranty. Any other big issues or deal breakers to look out for?

In terms of modifications, from my research it seems a tune, intake and downpipes (and mid-pipes?) seems to offer the best gain for minimal outlay. What sort of 1/4 mile times are people seeing from these mods? Mid 12's at low 11x mph?
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      02-17-2014, 02:16 AM   #2
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I've managed 620kms on a tank on the highway, there were probably afew kms left in the tank. Economy around town is okay, 11-12ltr/100kms doing short urban drives. In comparison, the same day to day driving in our 1.4 Golf is 7.9ltr/100.

Other things to watch out for on the n54 platform:
Leaking Injectors
Rattling Wastegates
Carbon build up from DI
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      02-17-2014, 02:36 AM   #3
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I'm currently getting better fuel economy from my N55 135i (10.2/100 km's) against my old Golf R (10.4/100 kms). Most of my driving is around town with very little highway driving.
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      02-17-2014, 03:38 AM   #4
Bakks
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Thanks for the feedback.

From research, the injector problem doesn't seem like a costly fix (unless you use your local stealership), and I would imagine the other two aren't big issues either?

Prodigy - how do you like the 135i compared to the R?
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      02-17-2014, 03:46 AM   #5
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Injectors need to be done in sets of three and are about $200 each.

The wastegate rattle is a bit of a bastard to fix as it needs replacement turbos. Cheap OEM replacements sourced from the states are about $1000-1200 USD for a set, plus GST, duties, consumables and labour. The other option is to just ignore the wastegate rattle if you're not getting ecu faults from it.

Carbon buildup is a maintenance thing, its one of the more expensive jobs for indy shops to do as its labour intensive. I believe Advan in sydney quoted around the $600? mark to do it before they got their walnut blaster.

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      02-17-2014, 05:05 AM   #6
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Push harder on the right pedal

Quote:
Originally Posted by Prodigy 72 View Post
I'm currently getting better fuel economy from my N55 135i (10.2/100 km's) against my old Golf R (10.4/100 kms). Most of my driving is around town with very little highway driving.
Sure that's not the 120d? I get 13's out of mine around town and love every minute of it
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      02-17-2014, 06:25 AM   #7
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Quote:
Originally Posted by Bakks View Post
Thanks for the feedback.
Prodigy - how do you like the 135i compared to the R?
I get asked that a lot, especially as i still hang around with the VW group, I'll be honest and say it did take a while to convince myself i had made the correct decision selling the R, there is still 1 or 2 niggly things about the 1 series i dislike which i didn't have with the Golf but all in all it is more fun to drive and feels quicker than the R, which is what it's all about i guess.


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Sure that's not the 120d? I get 13's out of mine around town and love every minute of it
Haha mate, well if it is it's a bloody quick 120d.
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      02-17-2014, 06:28 AM   #8
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I came over from an Audi S3 APR Stage 1 with all the usual bits.... The power delivery in the 135i is great, allot more than an S3, and more fun to drive and it's still standard! Although I do miss the AWD sometimes.

Reliability/maintenance?.... Too early to say.
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      02-17-2014, 07:27 AM   #9
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I beat my mates S3 shifting at 4k RPM stock vs stock.

Edit it is 8P.
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      02-17-2014, 07:43 AM   #10
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Stock v Stock you have 50hp and 70nm over a stock 8P S3 so you'd be pretty aggro if you lost. If it was a 8V S3 that's a good result!


I tried a R/S3/TTS while shopping for the 135. The 1 was just more fun to drive. Sure do miss having a twinclutch though..
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      02-17-2014, 03:25 PM   #11
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Go for it the 135 is a very good car, can be a bit costly to repair but all in all not to bad.
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      02-17-2014, 04:01 PM   #12
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I love my 1er. Sure, requires maintenance on a few areas, but what car doesn't when you start modding? I find it a rather straight forward and easy car to work on, albeit time consuming.

I'm currently only running cobb stage 1 aggressive. Slightly tweaked for e85 and have taken out a 5.0 mustang, which I had considered before buying the 1, multitude of evos, STI, and the like.

The power delivery and all around nature of the car is quite amazing IMO. Just yesterday I raced a ms3 which put down 389whp and 401wtq on the dyno and took him by lengths. Personally, I don't see any other car I would rather have at this price range.
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      02-17-2014, 05:51 PM   #13
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I have PPK on my N55 for warranty reasons, was going to upgrade to Cobb at a later stage, but truly I don't feel the need too, it has a crazy mid-range, only purchased the 135i as a daily, I now see why people hold on to them.
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      02-17-2014, 11:09 PM   #14
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Quote:
Originally Posted by thewafflecaust View Post
Injectors need to be done in sets of three and are about $200 each.

The wastegate rattle is a bit of a bastard to fix as it needs replacement turbos. Cheap OEM replacements sourced from the states are about $1000-1200 USD for a set, plus GST, duties, consumables and labour. The other option is to just ignore the wastegate rattle if you're not getting ecu faults from it.

Carbon buildup is a maintenance thing, its one of the more expensive jobs for indy shops to do as its labour intensive. I believe Advan in sydney quoted around the $600? mark to do it before they got their walnut blaster.
people have tested replacing a single injector.. thousands of miles later, working perfectly.

also can be had down to about $16x iirc.
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      02-17-2014, 11:24 PM   #15
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Quote:
Originally Posted by flinchy View Post
people have tested replacing a single injector.. thousands of miles later, working perfectly.

also can be had down to about $16x iirc.
That's pretty cool, though it makes me wonder why BMW replaces them per bank.
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      02-18-2014, 01:25 AM   #16
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I'm not sure why they change them in banks either as you edit the ecu to put in each of their tolerances so they will all pump out the exact amount of fuel required anyway.

I've replaced all 6 (3x -6 and 3x -11) in mine and did them in banks, If anymore fail I will just replace those with the old ones I know are fine.
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      02-18-2014, 02:32 AM   #17
Bakks
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Thanks for the feedback. My old man actually has a 135i that I've driven (in anger) many times, and stock it certainly is a pretty potent car. Reading about tunes and meth that can net another ~100 hp seems very tempting....
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      02-18-2014, 04:18 AM   #18
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Quote:
Originally Posted by Bakks View Post
I am toying with the idea of buying a manual N54 135i. They seem to be fantastic value for money, and with huge modification potential. I currently have a Mk 6 GTi which I like, but the 135i seems a bit more special....

My car does quite a few kilometers (~25k per annum, albiet mostly highway). What is the fuel economy like? Does it get better with a tune? And reliability? It seems the biggest issues seem to be the HPFP, which should have been replaced under warranty. Any other big issues or deal breakers to look out for?

In terms of modifications, from my research it seems a tune, intake and downpipes (and mid-pipes?) seems to offer the best gain for minimal outlay. What sort of 1/4 mile times are people seeing from these mods? Mid 12's at low 11x mph?
Quote:
Originally Posted by Prodigy 72 View Post
I'm currently getting better fuel economy from my N55 135i (10.2/100 km's) against my old Golf R (10.4/100 kms). Most of my driving is around town with very little highway driving.
Quote:
Originally Posted by 1BimmerNut View Post
Sure that's not the 120d? I get 13's out of mine around town and love every minute of it
Confirmed that it's about 10L/100km, I also mostly drive mine during the morning peak (albeit with a trip via the M2).
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      02-20-2014, 02:22 AM   #19
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Quote:
Originally Posted by thewafflecaust
Quote:
Originally Posted by flinchy View Post
people have tested replacing a single injector.. thousands of miles later, working perfectly.

also can be had down to about $16x iirc.
That's pretty cool, though it makes me wonder why BMW replaces them per bank.
Probably a 'just in case' thing? Bmw does do some strange stuff lol

If you can afford it, i'd say just do all 6, as they're apparently a fairly big change
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      02-20-2014, 05:27 AM   #20
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Things that may go wrong;
Valve cover gasket
Oil filter housing gasket
Oil cooler housing gasket
Water pump
Vanos solenoids
LPFP
Injectors
Coils
HPFP

I've had the first 7 fail on my N54 2008 335i, whilst stock.
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      02-20-2014, 11:22 AM   #21
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Quote:
Originally Posted by R3N
Things that may go wrong;
Valve cover gasket
Oil filter housing gasket
Oil cooler housing gasket
Water pump
Vanos solenoids
LPFP
Injectors
Coils
HPFP

I've had the first 7 fail on my N54 2008 335i, whilst stock.
Great list. I would only add spark plugs.
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      02-21-2014, 08:02 AM   #22
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Quote:
Originally Posted by R3N View Post
Things that may go wrong;
Valve cover gasket
Oil filter housing gasket
Oil cooler housing gasket
Water pump
Vanos solenoids
LPFP
Injectors
Coils
HPFP

I've had the first 7 fail on my N54 2008 335i, whilst stock.
Good reason to mod
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