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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 > VTT Stages 1 finally came in



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      12-22-2014, 10:52 PM   #1
Acekid187
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VTT Stages 1 finally came in

Like the title state my VTT stages ones came in on friday. Took a little longer then expected. Just under 4 weeks from payment to door. The packaging looks great. Should have car back tomorrow. Very excited!


[IMG][/IMG]
[IMG][/IMG]
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      12-22-2014, 11:05 PM   #2
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Here is a couple more pics. Sorry they are sooo big.


[IMG][/IMG]
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      12-23-2014, 03:22 AM   #3
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Good stuff, op. I'm quite interested in how well stage 1 turbos perform on premium only and with an e85 mix.
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      12-23-2014, 03:40 AM   #4
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Quote:
Originally Posted by bokyo1987
Good stuff, op. I'm quite interested in how well stage 1 turbos perform on premium only and with an e85 mix.
^^^^This
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      12-23-2014, 07:07 AM   #5
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I plan to get number with both 91 and e85 mix.
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      12-23-2014, 09:11 AM   #6
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High performance applications should never use a clipped turbine wheel. Clipping causes a minor increase in the wheel's flow capability; however, it dramatically lowers the turbo efficiency.

The reason for "stage 1" turbos not selling too well is that the stockers get to similar power levels at lower boost and most people know it.
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      12-23-2014, 11:14 AM   #7
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no billet wheel, ouch!

Helix has stg1 with Upgraded thrust, billet wheel for cheaper than VTT. Also yes they are tested and plenty of people are running them with results, logs, dynos ect.

anyhoo - Post up some logs when you have them installed.
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      12-23-2014, 02:25 PM   #8
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Quote:
Originally Posted by Island Road
Helix has stg1 with Upgraded thrust, billet wheel for cheaper than VTT. Also yes they are tested and plenty of people are running them with results, logs, dynos ect.
Helix or Hexon? Last time I checked Helix turbos, they were just under $3k.
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Last edited by bokyo1987; 12-23-2014 at 02:30 PM.
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      12-23-2014, 02:44 PM   #9
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Quote:
Originally Posted by jippii ensio View Post
High performance applications should never use a clipped turbine wheel. Clipping causes a minor increase in the wheel's flow capability; however, it dramatically lowers the turbo efficiency.

The reason for "stage 1" turbos not selling too well is that the stockers get to similar power levels at lower boost and most people know it.
Sort of.

You're correct that clipping reduces efficiency, but not the efficiency of the compressor wheel, efficiency of the conversion of exhaust flow to turbine rotation. If you have all the spool and boost capability that you want (and more) but are running out of breathing room up top, clipping is a viable option. Even Garrett mentions in their literature why clipping would make sense in certain applications.

I 100% agree that if you're designing a system from the ground up, it makes no sense whatsoever to have to use a clipped wheel. It's more appropriate when you're stuck with non-optimal constraints and want more flow and don't mind passing up some spool.

I personally chose non-clipped turbines in my application. As it were, spool is so quick that I probably could have gone clipped. *shrug*
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      12-23-2014, 03:24 PM   #10
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Quote:
Originally Posted by Island Road View Post
no billet wheel, ouch!

Helix has stg1 with Upgraded thrust, billet wheel for cheaper than VTT. Also yes they are tested and plenty of people are running them with results, logs, dynos ect.

anyhoo - Post up some logs when you have them installed.



Both upgrades where purchased
thrust and billet wheel
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      12-23-2014, 03:48 PM   #11
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Quote:
Originally Posted by Acekid187 View Post
Both upgrades where purchased
thrust and billet wheel
Ahh my mistake did not look like the billet wheel from the pics. Looking forward to your results!
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      12-23-2014, 09:48 PM   #12
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are these suppose to make 470-480whp?
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      Yesterday, 12:48 PM   #13
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WHP Level supported (with proper fuel, upgrades, and tuning) Stock - 470WHP per vargas website. I'm not running meth but do have access to e85. So we will see what the dyno says
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      Yesterday, 01:54 PM   #14
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I also wanna say shout out to elliot and modbargins for taken the time to answer all my questions. And shout out to Tony for emailing me back do quick with all my questions. Great customer service from both these guys. I will be doing more business with guys in the near future.
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      Yesterday, 03:04 PM   #15
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Quote:
Originally Posted by jippii ensio View Post
High performance applications should never use a clipped turbine wheel. Clipping causes a minor increase in the wheel's flow capability; however, it dramatically lowers the turbo efficiency.

The reason for "stage 1" turbos not selling too well is that the stockers get to similar power levels at lower boost and most people know it.
Someone referred to Garrett. The first paragraph I wrote is actually direct sentences from Garrett's materials. There are always exceptions to the rule, but VTT stage 1 is not one of them. You will be better off with stock turbos or stage 2 turbos depending on which power - lag combo you prefer.
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      Yesterday, 04:58 PM   #16
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You really can't make a sweeping statement like that.

We're in agreement that clipping is not going to be in an ideal design. Anything stock frame is a compromise, unless you're at stock power levels. Clipping then becomes a viable option depending on your goals.

I work with turbine design for Honeywell, who owns Garrett. I do understand very well the aero involved and you are 100% correct that doing much of anything to a well designed blade will certainly kill the efficiency. It's just that on the final package, given the very tight constraints of the stock frame set up, sometimes it can be a good decision.

Stage 2's or bigger are a "better" design but not within the small budget/stock frame/want more output window.
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      Today, 09:21 AM   #17
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Picked up car. It feels good. Haven't really got on it yet. But feels smooth. They are definitely louder
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