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Discussion Starter #1
So I contacted Bullseye Power and they said they would build a custom compressor wheel for the stock turbo (or next size up). They claim a 10% increase in flow over stock with no other mods (of course a tune would be needed to use the increase and not set the service engine light off).


Is anyone interested? I'm thinking a group buy. This would be for the T3 and later with the GTB2260 turbo.
 

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Semi-snake oil, and our factory turbo is not the GTB2260, its the GTB2056.

So an upgrade would be the GTB2260 with an upgraded wheel from bullseye or somewhere else.

Bullseye made big power claims for the duramax trucks and a lot of people jumped on board only to discover minimal is any gains.
 

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Discussion Starter #5
Define big power gains?


I was told 10% increase in air flow.... which to me isn't a huge gain but a medium gain. But a 10% increase in airflow is still an increase. So if the upper limit of a stock tune is 280-290 HP then that is a 28 to 29 HP gain. which puts me very close to my 30 HP goal.


If their upgrade is $400 that isn't bad for 30 HP of capacity. The tune would be the more expensive part.



Of course the question I have is what their compressor map looks like.


As to the turbo upgrade above. Sure why not. If the GTB2260 is the next size up then 10% on that should be an extra 10-20 hp.


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Define big power gains?


I was told 10% increase in air flow.... which to me isn't a huge gain but a medium gain. But a 10% increase in airflow is still an increase. So if the upper limit of a stock tune is 280-290 HP then that is a 28 to 29 HP gain. which puts me very close to my 30 HP goal.


If their upgrade is $400 that isn't bad for 30 HP of capacity. The tune would be the more expensive part.



Of course the question I have is what their compressor map looks like.


As to the turbo upgrade above. Sure why not. If the GTB2260 is the next size up then 10% on that should be an extra 10-20 hp.


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Well they also said the same 10% but for a much larger turbo, which should have netted 50-60 crank HP. That should've been something that you could feel from the seat of your pants, and also could have added more fuel to compensate for extra flow. It didn't happen.
Some guys actually tried it on a dyno and saw maybe a 5hp gain.

And I can sell you 4 nice compressor wheels for $400.

I'm not trying to be a jerk, just almost went down this road myself and trying to save people some money and hassle of swapping it out.
 

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Discussion Starter #8
I understand. I wish there was a way to flatten the torque curve. My main complaint is that after 2800 RPM I can feel the torque curve drop off. My second complaint is that towing a big trailer I could use just a little more power to run at 65 MPH. Right now I'm stuck about 62 MPH @ 10.5 MPG. If I try to go 65 MPH it down shifts and runs at 3200-3500 RPM and for some reason the engine just doesn't quite seem to like it there. Perhaps the issue is lack of enough boost at that RPM.


So my goal is to get a 400 + ftlb torque curve from 1600 RPM to about 3600 to 3800 RPM if possible. I'd love to get to around 500 or 550 ftlbs by 2000 or 2500 and keep at least that until 3500.


HP wise I guess I don't really care about peak numbers as much as the torque curve being more flat feeling.


So if I can put an upgraded turbo in that accomplishes the above I'd be happy with 300 to 350 HP. I just don't really like black smoke so I don't want to do it with fuel only.
 

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Have you done a remap on the car yet?
 

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Right now I'm stuck about 62 MPH @ 10.5 MPG. If I try to go 65 MPH it down shifts and runs at 3200-3500 RPM
To me it sounds like you were in 7th already (normal if you leave the slushbox in auto and you're pulling a parachute).
If you were in 8th at that speed, you'd be ~1800rpm (nudge the box into manual and upshift it... it will hold 8th unless its struggling)
If you were in 7th at that speed, you'd be ~2100rpm and it should have plenty of grunt.
If you were over 3k rpm, I'm suspecting that you were all the way down into 6th and at that point you've already fallen off the peak torque and are on the downward slope in stock form.
 

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Discussion Starter #12
I guess now that I think about it up-shifting makes more sense with the turbo performing as it does for torque reasons but, for HP reasons downshifting is the answer per the dyno curves I've seen.


I was running S mode with a parachute of a trailer. It just didn't quite have enough HP (perhaps boost) to stay in 6th and would downshift to 5th. My concern upshifting is the load on the transmission. As I understand it the transmission is rated at 650 ftlbs which should be over kill for this type of application, however the engine just didn't sound happy unless I backed down the speed to about 60~62 mph.
 

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I can tell you that when I towed, I went to manual and upshifted since the TCU logic wanted to stay in 7th instead.
If I recall the stock dyno charts, you being in the ~3200 rpm zone, would've put you in a less than desirable part of the TQ and HP curves.... you're right where the TQ has dropped off, and the HP is still trying to climb.... pretty much the worst place to be if you want to get going.

The main problem is aerodynamics however..... I'm sure you know that coefficient of drag is proportional to velocity squared... so even though you want to bump up the speed "slightly" you are actually asking A LOT from the Touareg pulling that parachute around.
 

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I just looked at your trailer again... you were literally pulling a flat wall.... it wasn't even a V nose or anything with the slightest attempt at an aerodynamic shape.
 

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Discussion Starter #15
Yep. That’s why I need a 7 cylinder with a turbo upgrade.... or a better turbo.

I was surprised to see 10.5 mpg. That’s about what the Duramax gets pulling the same trailer. I got 22 mpg pulling a 16’ dual axle U haul. Which I thought was pretty good.

Just need a turbo upgrade to widen the torque curve.

It would be nice to have a tow mode shift and downshift schedule. I notice it upshifts outside the torque band and won’t allow downshifting when it should.
 

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Yep. That’s why I need a 7 cylinder with a turbo upgrade.... or a better turbo.

I was surprised to see 10.5 mpg. That’s about what the Duramax gets pulling the same trailer. I got 22 mpg pulling a 16’ dual axle U haul. Which I thought was pretty good.

Just need a turbo upgrade to widen the torque curve.

It would be nice to have a tow mode shift and downshift schedule. I notice it upshifts outside the torque band and won’t allow downshifting when it should.
And a TCM tune to take advantage of the diesel torque instead of shifting like a gasser.
 

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Discussion Starter #17
I understand the controller is shared with the Aisin used in the Dodge ecodiesel ??

This tuning is similar.

Can anyone custom tune this thing (to their own preference)?

Also is the tune I’ve got right now a ‘gasser’ tune?
 
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