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Suggestions for N55 performance upgrades...
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05-18-2014, 11:38 AM | #1 |
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Suggestions for N55 performance upgrades...
Well, I am thinking about getting a custom remap on my MY11 E91 335i.
I'm wondering what basic upgrades I could/should fit before having a custom map done on my car?? I'm not interested in hybrid twinscroll turbos or mega injectors at the moment, haha... this is just a basic stage 1 upgrade which I am looking at doing and I'd thought: - De-Cat Downpipe - Panel Filter - Remap ...is the standard cat-back exhaust system restrictive?? What size/diameter is it?? Cheers, Grant
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05-18-2014, 11:39 AM | #2 |
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Reasons for this is two fold...
- I've never been a fan of 'off the shelf mapping' which in my experience makes certain compromises to remain safe on every car which is flashed with its data.. for example; one compromise that I think Hartge have made is, to run every rich across the table, meaning that my average.... even when trying everything you would to achieve max economy, results in c22mpg at best. With sub-20 being the norm on daily duties, now, I'm not expecting a 335i to be a hypermile monster, but 30mpg on a gentle run would be a nice option to have!! - The way the 335i drives with the Hartge map is fine, but I think it could be improved with a custom map written to my car.. and it may give me the opportunity to increase headline figures too, although my main aim is to increase area under the graph and lean it out a bit to reclaim some lost mpg. Cheers, Grant
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05-18-2014, 02:58 PM | #3 |
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Pretty sure de-cat downpipe would net you biggest gains after a remap, If you can't stretch to a full system catless/sport cats.
Besides that, perhaps something like http://burgertuning.com/N55_BMW_Performance_intake.html insted of a panel filter. Also a bigger FMIC if its within your budget. There are a lot of options for that Forge, Wagner etc I have a N54 myself and really need to get round to getting catless downpipes just not sure what make to get and what garage I can trust to fit them. |
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05-18-2014, 03:30 PM | #4 |
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Budget is going to be what it needs to be to cover a safe stage one set-up I guess. I don't want to cut any corners and discover down the line that there are bits which I should have fitted to compliment the bits I did fit.
I have had an exhaust hand made before by a fantastic place who built exhausts for Colin McRae's personal collection, so if needs be, I will travel through and get those guys to make a system up for the 335i. However, if I can keep the standard system without it compromising gains then I will do... however I suspect that if it is 2.5" then it will prove to be a wee bit restrictive at over 350-360bhp. Had a look at that intake, sounds nice and it would be good to get a little more intake noise.. even though I'm a bit dubious about having an open cone in the engine bay. Regarding downpipe, VRSF seem to be a name which pop up. Although not sure there are UK distributors for that. Cheers, Grant
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05-18-2014, 03:30 PM | #5 |
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Cat less pipes for sure(you'll need to have a JB4/re map to suit otherwise possible error codes will appear, I'm running VRSF's on my N54 they really do work, along with an intercooler you should be a reasonable gain, though the intercooler may well produce some low down lag and as you say getting a map to take in to consideration the mods you're planning would be a great move forward.
Exhaust wise though haven't done this myself there's gains to be had from the down pipes back even more with an'X'pipe though many report no gains from the rear section(though as I discovered they can sound awesome) Power wise restore some lost energy with a walnut blast perhaps(surprising really but the valves can get really coated from 30k, I've fine mine really transforms the way the car drives in daily traffic and when pressing in)air filter wise I'm running a panel on my N54 and may switch to a twin gone setup but I'm sure those with these mods in place will be better versed than me to explain the filter benefits. |
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05-18-2014, 04:42 PM | #6 |
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Yeah, I will try and organise it so that the downpipe goes on as close to mapping day as I possibly can... just in case I'm running lean or anything, don't want to risk things going all to hell.
Will check out the costs for an intercooler, are there any suppliers which are known to give good deals?? UK preferred to avoid potential customs charges, but happy to buy overseas if reliable and good prices. I've never heard of walnut blasting before, sounds like a wind up, haha... is it something which any garage could do or is it more specialist?? IIRC my car is on ~36k miles just now, so might be a good shout to do in addition to further mods. Cheers, Grant
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05-18-2014, 04:42 PM | #7 |
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I see you commented about lack of traction out of a corner on the track...I've never been near a track in my 335, but even on public roads the Quaife LSD I had fitted made a HUGE difference interms of extra traction. For me the lack of traction was a problem even running on the stock map, so a LSD was the first mod I did to the car.
I've yet to see a bad review about the Quaife LSD from anyone who has had one fitted and than taken the car to the track. |
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05-18-2014, 04:55 PM | #8 | |
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Quote:
Cheers, Grant
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05-18-2014, 05:00 PM | #9 |
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Well if you decide to get a catless rally exhaust on your 335i please make a video! haha
Yep VRSF is the name that comes up a lot for downpipes that fit RHD, there are others though, I dunno if its 100% necessary to import from the US. I dunno if anyone has tried the Wagner ones on RHD. As for filter(s) after much research the conclusion I came to was basically the only plus side to cone(s) are noise and perhaps maintenance. If you run an Airbox with a performance filter you get arguably 'cooler' air because it keeps the intake away from then engine heat, The downside is the air flow is slightly more restricted than just a cone. If you run a Cone(s) Then it is open to the elements and gets radiant heat from the engine but then again the airflow is better. So the BHP difference is negligible. I don't know anyone capable of doing walnut blasting in Scotland, Although seems like a worth while investment steve. |
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05-18-2014, 07:50 PM | #11 |
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its still a direct injection engine, though a later version therefore in time it'll still have to tackle the same issues (advanced carbon build up)as the N54 and also the N53 unit too, though not overall reported over here in the States, partly due to fuel quality, part of the issue with these engines is the PCV side of things where oil fumes venting add to the problem of direct injection which ultimately leads to gummed valves, I put an OCC in place last year after reading that in the states it's a popular preventative move to help along with a Rob Beck PCV valve all of which are worth investing in for a healthy engine
Last edited by old grey steve; 05-18-2014 at 07:56 PM.. |
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05-19-2014, 05:52 AM | #12 |
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I wouldn't be worrying about carbon build up on one of them just yet.The engines been out for over 4 years,no issues I'm aware of.Direct injection doesn't necessarily mean you're cleaning you're valves every 50k.Ive had manifolds off of countless n43/n53/s63 and their not even remotely bad.I even did my own car for a walnut blast (namely because of all the stories on these forums about how bad it supposedly is)and it wasn't even bad at 55k miles and even after I had done it it made no real difference to running at all.
Last edited by KM79; 05-19-2014 at 06:53 AM.. |
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