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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 > hks upgrade? or single turbo upgrade?



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      11-16-2006, 02:17 AM   #1
eclivia
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hks upgrade? or single turbo upgrade?

does anyone know if hks going to make an upgrade for 335 or any company planning on doing single turbo upgrade?
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      11-16-2006, 02:21 AM   #2
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only companies that like turbo lag, and don't want an every day drivable rocket ship.
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      11-16-2006, 12:09 PM   #3
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I'm pretty sure HKS doesn't "like" turbo lag nor do any other company that produce turbokits. They do their best to produce big power with the quickest spool rate your hard earned money can afford. And can we all please stop making such an f'n deal about the "zero lag" of the stock system. "zero lag" means a compromise in performance. For a stock car it's great but for those that want brutal acceleration, zero lag means "slow", little lag means "getting better" and moderate lag means "holy Shite!" Now back to question at hand, nobody is making upgrade kits yet. I believe there may be ways to use some of the stock parts combined with greater boost producing aftermarket parts. Just have to find out what turbos are actually on this thing. You could contact a company that does one-offs but as you can probably guess, it would be a tad more spendy than an off the shelf kit. Check out Full Race or LoveFab for ideas on what is possible.
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      11-16-2006, 12:35 PM   #4
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Technik is planning on a single turbo setup, after they to engine management etc.
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      11-16-2006, 01:02 PM   #5
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It will be months before you will see any products available for turbo upgrades.

Alot of research needs to happen with this, the car uses a brand new seimens ecu which is not previously available in any bmw. Software companies are cracking the ecu currently, piggy back ecu's like the exede are available. But tuning a turbo kit requires fuel upgrades, clutch, custom piping etc.

Plus no company is going to release a turbo kit without a successful car running the system for at least 2-3 months flawlessly, and 1000's of data logged miles.

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      11-16-2006, 01:11 PM   #6
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Quote:
Originally Posted by vividracing
...piggy back ecu's like the exede are available.
Hi Mike,
What other piggybacks are available? I wasn't aware that other systems could redefine the wideband o2 sensor targets. Not to say it will never happen. Just didn't think any other system was actually working fully on the 335i at this time.
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      11-16-2006, 02:27 PM   #7
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how much of a difference will a bigger turbo(s) make to overall power on pump gas? i was under the impression the pressures were already close to the limit due to the high compression ratio.
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      11-16-2006, 02:31 PM   #8
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Quote:
Originally Posted by kingbriani
how much of a difference will a bigger turbo(s) make to overall power on pump gas? i was under the impression the pressures were already close to the limit due to the high compression ratio.
There can be power gains with upgraded turbos due to the reduction in exhaust backpressure and improvements in VE. How much really depends on turbo matching and available octane. On pump gas, I'm guessing we could see 400whp or thereabouts. On race gas, one could get considerably more (beyond the limit of the block I'm guessing).

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      11-16-2006, 02:39 PM   #9
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Quote:
Originally Posted by shiv@vishnu
There can be power gains with upgraded turbos due to the reduction in exhaust backpressure and improvements in VE. How much really depends on turbo matching and available octane. On pump gas, I'm guessing we could see 400whp or thereabouts. On race gas, one could get considerably more (beyond the limit of the block I'm guessing).

-shiv
sorry for the newb question, but whats VE? the rest makes sense though. thanks for your valuable insight!

EDIT: So I did a search and found a website that kind of explains VE (Volumetric Efficiency)http://www.ztechz.net/id2.html. I'm still having some trouble wrapping my head around what exactly it represents though. I see the formulas to calculate VE as well as CFM but can't figure out exactly what they measure in reality.
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Last edited by kingbriani; 11-16-2006 at 02:59 PM.
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      11-17-2006, 05:19 PM   #10
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Quote:
Originally Posted by kingbriani
sorry for the newb question, but whats VE? the rest makes sense though. thanks for your valuable insight!

EDIT: So I did a search and found a website that kind of explains VE (Volumetric Efficiency)http://www.ztechz.net/id2.html. I'm still having some trouble wrapping my head around what exactly it represents though. I see the formulas to calculate VE as well as CFM but can't figure out exactly what they measure in reality.
so no answers huh? was it a dumb question or a hard question?
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      11-17-2006, 06:27 PM   #11
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VE is a measure of how effectively the cylinder fills/emptys with each cycle.

a low VE means that there's more gas that is in the cylinder that was also in the cylinder last combustion cycle.

a perfect 100% VE is 100% fresh fuel/air that is 100% exhausted
(impossible, but closer is better)
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      11-17-2006, 06:33 PM   #12
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Quote:
Originally Posted by ward
VE is a measure of how effectively the cylinder fills/emptys with each cycle.

a low VE means that there's more gas that is in the cylinder that was also in the cylinder last combustion cycle.

a perfect 100% VE is 100% fresh fuel/air that is 100% exhausted
(impossible, but closer is better)
ok awesome that makes sense. thanks for putting it in layman's terms! so a bigger turbo will not only help to cram more fresh air into the cylinder, it will also not create as much of a restriction on the exiting exhaust so more can get out between combustion cycles. makes sense.
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