[ksalih]

A turbo's power outside of it's efficiency range will begin to converge. This is why we don't run stage 1's @ 25psi, etc. Unless you like that extra heat

[gzim335]

Originally Posted by Vicko

I beat a c63 on stock turbos FBO race/pump mix three times in a row. No need for upgrade turbos.

I ran my friends 2011 e63 and beat it by two cars from 30 - 140
I was running e30 and 100% meth.
c63 with just sec cat delete and drop in filter is much faster than e63 6.2l

[Snaggletooth]

Okay, a little follow up in regards to the VTT stage 1's since there seems to be a lively debate here.

The theory behind the stage 1's is it has a slightly bigger impeller wheel which should put out more boost, it also has a clipped turbine wheel which improves high-rpm power due to the turbine wheels serving as less of an exhaust restriction. In real world applications, the 7 degree clip does not seem to have much of an effect, but you can feel the larger impeller and in high RPM's these turbos shine while having a similar spool to stock.

I can speak for these turbos, the difference between these and stock are that these turbos can handle higher boost before they shit themselves (i opted for the TD04 thrust upgrade) as well as having good high RPM efficiency. The difference between these turbos and stock is similar to how the car felt before and after catless DP's.

In regards to the E63, the mods were unknown. A kill on a 525hp car is impressive regardless. Especially since the car hasn't had any dyno time to fully exploit the new turbos, just JB4 map 3 + JB3 logic methanol.

When SWIM finishes chasing down the imfamous white smoke issue catless RB and Vargas guys are having, i'll post some dyno runs for you guys! The Vargas PCV is inbound, so hold onto your panties!

[jippii ensio]

Originally Posted by Snaggletooth

Okay, a little follow up in regards to the VTT stage 1's since there seems to be a lively debate here.

The theory behind the stage 1's is it has a slightly bigger impeller wheel which should put out more boost, it also has a clipped turbine wheel which improves high-rpm power due to the turbine wheels serving as less of an exhaust restriction. In real world applications, the 7 degree clip does not seem to have much of an effect, but you can feel the larger impeller and in high RPM's these turbos shine while having a similar spool to stock.

I can speak for these turbos, the difference between these and stock are that these turbos can handle higher boost before they shit themselves (i opted for the TD04 thrust upgrade) as well as having good high RPM efficiency. The difference between these turbos and stock is similar to how the car felt before and after catless DP's.

In regards to the E63, the mods were unknown. A kill on a 525hp car is impressive regardless. Especially since the car hasn't had any dyno time to fully exploit the new turbos, just JB4 map 3 + JB3 logic methanol.

When SWIM finishes chasing down the imfamous white smoke issue catless RB and Vargas guys are having, i'll post some dyno runs for you guys! The Vargas PCV is inbound, so hold onto your panties!

Clipping a turbine wheel compromises its efficiency. So you need to push more boost to compensate for the lost efficiency. Pushing more boost gets the engine towards the knock limit. If there is octane left for more aggression, it would be healthier to add advance instead and keep the stock wheel aerodynamics intact with its original efficiency.

Clipping is an easy hack and that's why there have been many clipped turbine wheel "upgrades" available along the years. However, these types of turbos have disappeared from the N54 aftermarket as they haven't been competitive. Funny how the new vendors try to do the same old tricks year after year.

Enough talking already, let's see the dynos

[klipseracer]

Originally Posted by Lunatic Fringe

+1. Not sure why you guys are hell-bent on spinning the shit out of your turbos. The marginal gains in power are simply not worth it IMHO.

Hell Bent? I don't know why you're hell bent on making inaccurate posts.

[Wedge1967]

Originally Posted by klipseracer

Hell Bent? I don't know why you're hell bent on making inaccurate posts.

I normally don't comment on stuff like this, but

Did you read Lunatic Fringe's location? Sideways... All with stock turbos and no tune.. I'm frozen with excitement. Someone is clearly stuck in the '80's

[Snaggletooth]

Originally Posted by jippii ensio

Clipping a turbine wheel compromises its efficiency. So you need to push more boost to compensate for the lost efficiency. Pushing more boost gets the engine towards the knock limit. If there is octane left for more aggression, it would be healthier to add advance instead and keep the stock wheel aerodynamics intact with its original efficiency.

Yes, and no. Remember these little turbos run out of breath high up but have no problem down low. A slight clip can optimize the turbo for the application while retaining a relatively stock housing. It's not ideal, but it does improve performance to a certain degree by making the OVERALL system more efficient through removing some degree of backpressure. Similar to how some cams suck down low but make WAY more power up high, it's all relative based on where and how you want to see gains.

Clipping is an easy hack and that's why there have been many clipped turbine wheel "upgrades" available along the years. However, these types of turbos have disappeared from the N54 aftermarket as they haven't been competitive. Funny how the new vendors try to do the same old tricks year after year.
Maybe so, but then again knowing that, why not see if someone can take it from theory to applied?

Enough talking already, let's see the dynos
I'll get dynos out when I have some time off work. Believe me, I'm just as interested in the raw numbers as you are.

Long story short, ass dyno notes improvements, especially over the deaded stock turbos I had in the car. When i'm done chasing down basic gremlins in my car (such as my recently melted FSB) and other things, you guys will get some raw numbers when it's convenient for me.

[Lunatic Fringe]

Originally Posted by Wedge1967

I normally don't comment on stuff like this, but

Did you read Lunatic Fringe's location? Sideways... All with stock turbos and no tune.. I'm frozen with excitement. Someone is clearly stuck in the '80's

I have stock turbo's and no tune? Interesting...that's news to me .

[Wedge1967]

Originally Posted by Lunatic Fringe

I have stock turbo's and no tune? Interesting...that's news to me .

Just being sarcastic..