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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-10-2003, 01:31 PM   #1
ILLCOMM
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BMW's Inline 6 and Turbos ...

Why are there no aftermarket turbos available for the I6? Is there some sort of incompatibility with the engine ... with the computer (emissions)... with something? The supercharger options are plentiful ... yet no turbos! To me, having a turbo on my non-M engine makes the most sense ... the turbo helps your lown end immensely whereas the supercharger really doesn't achieve full boost until you hit your maximum RPMs. Plus, the superchargers are parasitic ... they rob horsepower ... like 50hp for 8psi of boost ... of course this is made up for in the HP gains but still ... i just like the performance characteristics of a turbo...
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Old 08-10-2003, 01:33 PM   #2
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Search for user KromeX, he's running a custom turbo
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Old 08-10-2003, 02:09 PM   #3
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Running a turbo at worthwhile boost would mean replacing
pistons with ones that'll provide lower compression, add
fitting the turbo/intercooler and all associated piping, heat
shields, etc. and you're talking big bucks-oh yeah, who's
gonna reprogram your ecu? Supercharging-and there are
lots of kits out there-is an easier proposition without having
to put up with as much HEAT as a turbo generates. Properly
installed/maintained, a supercharged engine will last while
turbos eventually consume themselves and their motors, and
by far the best thing about superchargers is NO LAG.
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Old 08-10-2003, 03:35 PM   #4
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heard of turbo lag? help ur low end? no...

u got them swtiched up
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Old 08-10-2003, 03:36 PM   #5
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There are turbos available for BMW's I6 just not many for the e46 applications.
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Old 08-10-2003, 03:38 PM   #6
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The new Tunigwerks magazine has an article discussing why there are not many turbos out and the benefits and drawbacks of having one. They are also using a project car to put one in......
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Old 08-10-2003, 03:41 PM   #7
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Quote:
Originally posted by ///M3BoosT
heard of turbo lag? help ur low end? no...

u got them swtiched up
a correctly sized turbo will have virtually no lag.


supercharger hits max boost at max RPM

turbo can hit max boost as low as 2500 RPM, for example.

help my low end, yes.

lag, not really.

you might consider reading this:

http://members.tripod.com/tomak3/page10.html

it is very informative.
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Old 08-10-2003, 03:57 PM   #8
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I want a turbo cuz I want lag. I want a big ass turbo that doesn't come on til around 3750 rpm that suddenly shoots the car forward like an Evo 8. I love turbo lag thats the fun of having a turbo to me becuase then you know that you can let the car relax if you don't want to drive it hard all the time.


By they way ATP has a turbo kit coming out for 4995.00 . It should be out soon.
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Old 08-10-2003, 04:21 PM   #9
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Quote:
Originally posted by tpzblu330ci
By they way ATP has a turbo kit coming out for 4995.00 . It should be out soon.
That's right, I forgot all about that kit, I first heard that they were coming out with a kit a few months ago. Isn't ATP big in the Audi/VW world?
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Old 08-10-2003, 04:27 PM   #10
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a worthwhile turbo does not have to include exchanging of interals to lower compression. a worthwhile turbo may provide enormous amounts of power at a boost level as low as 6 psi. the atp kit probably offers a peak boost of 6-8 psi around 3500 rpm.
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Old 08-10-2003, 04:37 PM   #11
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If giving up linear and predictable power
release for a distorted and uneven one that
can catch you out is your thing then go for it.
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Old 08-10-2003, 07:24 PM   #12
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i heard the atp turbo will not be available for only the 330i and not the 323i, is this correct?
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Old 08-10-2003, 07:34 PM   #13
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Yah, its 330 from what i can tell on their website....but their preliminary dynoes are DAMN nice. About 318hp/lb at the wheels....time to kill m5's.
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Old 08-10-2003, 08:02 PM   #14
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Quote:
I want a turbo cuz I want lag. I want a big ass turbo that doesn't come on til around 3750 rpm that suddenly shoots the car forward like an Evo 8. I love turbo lag thats the fun of having a turbo to me becuase then you know that you can let the car relax if you don't want to drive it hard all the time.
So when you are heading for the apex on the cornering limit and all of a sudden WOOOOOOOOOSH your turbo kicks in - now you are in the sand trap waiting for the stewards.
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Old 08-10-2003, 08:15 PM   #15
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Well a turbo is alot more fun to mod with IMO...you dont need to change any internals really if you want to push 8psi safely...a turbo is definitly what I am waiting for...and turbo lag isnt as bad as you all make it out to be...your car will still pull like you normally would but at the certain RPM you will get that gradual sudded force that pushes your car forward like a monster...turbo and bolt ons make for great hp returns!!!!
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Old 08-10-2003, 08:36 PM   #16
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<<----waiting for turbo that works and gives me the hp i need
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Old 08-10-2003, 08:49 PM   #17
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compressions questions

they are working on it these days. they have s/c for e30 and e36 cars. they will come out with them in the future just wait.
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Old 08-10-2003, 09:13 PM   #18
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Coming up with a full done real good turbo kit will run you $4k. I have a friend who has a shop who fabricates custom turbos and such. The only reason I haven't had him make me one is the lack of ECU tuning. If AEM were to come up with their EMS for our cars, turbos would be a lot more attainable.
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Old 08-10-2003, 09:18 PM   #19
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Quote:
Originally posted by MMJ4mil
<<----waiting for turbo that works and gives me the hp i need
me tooooooooo
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Old 08-10-2003, 11:20 PM   #20
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Quote:
Originally posted by ILLCOMM


a correctly sized turbo will have virtually no lag.


supercharger hits max boost at max RPM

turbo can hit max boost as low as 2500 RPM, for example.

help my low end, yes.

lag, not really.

you might consider reading this:

http://members.tripod.com/tomak3/page10.html

it is very informative.
yes, you can get a smaller turbo to elimnate turbo lag, but you will have no top end....a supercharger is better cause there's no lag, and it creates more power along the rev range while a turbo creates more peak power...
and yes, a supercharger does feed of the power of the engine, but the power it makes more than makes up for it in the end

tpzblu330ci, i have never heard of someone who likes turbo lag...hahah...if you want that boost get nitrous...lol NA is the best for racing, but Turbo is more fun especially when you add the BOV...i think you can add a BOV to a supercharger as well
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