[Beemw335]

http://www.e90post.com/forums/showthread.php?t=501063
Post 9
Mike??

[DfVgyCjmFQnu]

Originally Posted by Mike@N54Tuning.com

Actually, it doesn't. To adjust boost on the diesel motor you would need to connect to the MAP sensor, MAF sensor, and wastegate solenoid. DTUK only connects to the MAP sensor. BMS experimented with the four sensor arrangement (like their gasoline tunes) during JBD development\ but power gains were not there over the single sensor setup they ultimately released. And the single sensor setup allowed for an easier install and lower product price.

Mike

Yes it does.

"Unlike our other common rail modules, GREEN, RED, CRD2, that only connect to the common rail pressure sensor, the new CRD-T also connects to the turbo pressure sensor, allowing us to control and increase the boost settings. "

"The Common Rail CRD-T MultiChannel Digital Plug and Play Diesel Tuning System from DTUK is available for a variety of Common Rail turbo diesel engines and improves power and torque by up to 40%. The CRD-T differs from our other systems by connecting into the turbo boost sensor as well as the fuelling system for additional control over the vehicles power delivery."

http://www.diesel-performance.co.uk/...ails.php?id=10

[Mike@N54Tuning.com]

Originally Posted by Ligament

Yes it does.

"Unlike our other common rail modules, GREEN, RED, CRD2, that only connect to the common rail pressure sensor, the new CRD-T also connects to the turbo pressure sensor, allowing us to control and increase the boost settings. "

"The Common Rail CRD-T MultiChannel Digital Plug and Play Diesel Tuning System from DTUK is available for a variety of Common Rail turbo diesel engines and improves power and torque by up to 40%. The CRD-T differs from our other systems by connecting into the turbo boost sensor as well as the fuelling system for additional control over the vehicles power delivery."

http://www.diesel-performance.co.uk/...ails.php?id=10

No, they just are claiming it does, and maybe even believe that, I'm not sure. On older diesel motors like they are used to tuning you could increase boost by attenuating the MAP sensor but in the new BMW models like the 335D this technique does not work. You must offset the MAF and wastegate solenoids in addition to the MAP to increase boost. There is an old dyno test posted around here of a fuel+MAP dyno vs. a JBD fuel only and the JBD made identical or more power despite the supposed "boost increase" of the competitive module. I thought they had figured it out and fixed their marketing by now.

Mike

[Concentric190]

Originally Posted by crazyinp

I am torn. I really need to stop reading any forums just the way I did for a year So I don't really know why but I need more power since my car has only 2600 miles and obviously still under warranty I am leading toward JBD. Which is easy to remove when go to the dealer.

So tell me why I should NOT buy it!

I'd hold out for the evolve tune. I should have all the final results posted up by next week.

[DfVgyCjmFQnu]

Originally Posted by Mike@N54Tuning.com

No, they just are claiming it does, and maybe even believe that, I'm not sure. On older diesel motors like they are used to tuning you could increase boost by attenuating the MAP sensor but in the new BMW models like the 335D this technique does not work. You must offset the MAF and wastegate solenoids in addition to the MAP to increase boost. There is an old dyno test posted around here of a fuel+MAP dyno vs. a JBD fuel only and the JBD made identical or more power despite the supposed "boost increase" of the competitive module. I thought they had figured it out and fixed their marketing by now.

Mike

I find it suspect that you are Burger dealer. Conflict of interest?

The DTUK CRD2 has two plugs, one of which is for the turbo system. Are you saying flat out that the interface is there for show only?

I have no financial interest at all, just a 335d owner.

[DfVgyCjmFQnu]

Originally Posted by Mike@N54Tuning.com

No, they just are claiming it does, and maybe even believe that, I'm not sure. On older diesel motors like they are used to tuning you could increase boost by attenuating the MAP sensor but in the new BMW models like the 335D this technique does not work. You must offset the MAF and wastegate solenoids in addition to the MAP to increase boost. There is an old dyno test posted around here of a fuel+MAP dyno vs. a JBD fuel only and the JBD made identical or more power despite the supposed "boost increase" of the competitive module. I thought they had figured it out and fixed their marketing by now.

Mike

Mike, I emailed Andrew at DTUK today about your comments. He replied to me, and gave me permission to post his reply:

"The 2 channel system connects to the boost pressure sensor and does result in more power being produced over the common rail only systems.

In the case of a 4 cylinder fiat/gm 1.9 jtd/cdti engine the crdt (common rail plus boost sensor)produced 10bhp more than the crd2 (common rail only)module.

We sold around 600crdts now onto BMW, merc, Audi, VW and Opel vauxhall and as soon as you disconnect the boost connections and revert back to common rail the notice in power drop is very noticeable.

So the crdt DOES produce more power over the crd2 system.. FACT.


Regards,
Andrew Pawley
Managing Director
Diesel Tuning UK LTD
Office: 01207 299538
Mobile: 07977 466 007"

[Beemw335]

Mike completely ignored my post where I showed him stating that the jbd increases boost pressure, so dont expect him to answer this post^^

[Mike@N54Tuning.com]

Originally Posted by Ligament

I find it suspect that you are Burger dealer. Conflict of interest?

The DTUK CRD2 has two plugs, one of which is for the turbo system. Are you saying flat out that the interface is there for show only?

I have no financial interest at all, just a 335d owner.

I believe the MAP sensor signal is being attenuated and that from their reply DTUK believes it is adding more boost because in other applications attenuating the MAP sensor does add more boost. But the BMW 335D engine doesn't work that way. For example on the BMW N54 motor attenuating the MAP signal adds boost while on the newer N55 motor to add boost you must also attenuate the MAF and waste gate signals. Now if you show me a DTUK harness with 4 connectors, hitting common rail, MAP, MAF, and wastegate, then I will agree it can consistently control boost. As I said BMS tested this during development and after not making any additional power went with the less expensive and easier to install option. That isn't to say you might be not perfectly happy with the DTUK solution. Feel free to purchase it, connect a boost gauge, and post a before and after video. Go to the track with some JBD owners and see how it stacks up. Tune and be happy.

Anyway here is that independent dyno of a JBD and a similar 2 sensor VAC system (boost and fuel) that also "increases the boost". Note the similar top end power output. I'm not sure what the setting of each system were for this testing but the JBD was supposed to be significantly outperformed up top by the 2 sensor system and simply wasn't.

[Mike@N54Tuning.com]

Originally Posted by Beemw335

Mike completely ignored my post where I showed him stating that the jbd increases boost pressure, so dont expect him to answer this post^^

What post is that? The JBD increases fueling and slightly increases boost pressure. The boost pressure increase is not the result of boost control or MAP sensor attenuation but simply a byproduct of the larger exhaust volume from the extra fuelling.

Mike

[cssnms]

Mike the JBD is def not set at the upper setting in that dyno, otherwise it would have crushed the VAC module.

[335dM]

Originally Posted by EYE4SPEED

Would be easier if the engine cover bolts weren't such a pain to get off. The one closest to the driver should be left out permanently.

it takes me 6-7 mins max!! total without rush to remove jbd and reinstall cover and all bolts!
i use a snap-on screwdriver with allen bit to remove them all and a snap on small hook to remove the plastic pin in the connector!
should be an easy task

Don't forget to unclip the plastic over the last drivers bolt in the back

[cssnms]

Originally Posted by tonyteam

from stock 1600bar of rail pressure, with JBD @ 100% the rail pressure goes up to 1800bar or higher?

Rail pressure and boost pressure are two different things. Rail pressure refers to fuel rail pressure. Boost pressure refers to turbo boost pressure.

[cssnms]

Originally Posted by 335dM

it takes me 6-7 mins max!! total without rush to remove jbd and reinstall cover and all bolts!
i use a snap-on screwdriver with allen bit to remove them all and a snap on small hook to remove the plastic pin in the connector!
should be an easy task

Don't forget to unclip the plastic over the last drivers bolt in the back

While I use an allen wrench and it take me all of 15 minutes it's still a PIA.

It's not so much the removal of that one bolt in the back right hand corner as it is reinstalling it and getting the threads lined up. I also have this problem w/one or two other bolts. Removing the bolts is the easy part as fas as I concerned, but reintalling the engine cover seems to take me 3 times longer.