Increasing Boost on DASC?

[G.T.]

Has anyone tried to use underdrive pulleys on their DASC to get more boost? Is this even possible with the DASC?

[DustenT]

Originally Posted by G.T.

Has anyone tried to use underdrive pulleys on their DASC to get more boost? Is this even possible with the DASC?

Yes, it's possible to increase boost on the DASC. Chad (zerog) sells several different pulley sizes for the DA kit. They are availabe here:

http://www.itsallaboutspeed.com/products.html

The 3.6" pulley (on an m44) will give you 9.5psi of boost.

Use caution when bumping up the boost if you are using the factory ECU programming and factory injectors. I recommend getting NickG's stage 2 or stage 3 software if you want to run additional boost. NickG confirmed that he's tested upto 10psi with stage 3 without any problems.

Here is a bf.c thread about the 9.5psi pulley:

http://forums.bimmerforums.com/forum...d.php?t=303804

[G.T.]

The car is using a TMS chip right now. Any idea if that'll work with the UDP? $100 seems like a good deal but if I have to get bigger injectors, I'm not so sure.

Also, was there a discernable difference in power? Was the driveability affected in any way at all? The car is my commuter and I'd still like to keep it dependable...

Good info, Dusten. Thanks!

[DustenT]

Originally Posted by G.T.

The car is using a TMS chip right now. Any idea if that'll work with the UDP? $100 seems like a good deal but if I have to get bigger injectors, I'm not so sure.

Also, was there a discernable difference in power? Was the driveability affected in any way at all? The car is my commuter and I'd still like to keep it dependable...

Good info, Dusten. Thanks!

I'm pretty sure you aren't supposed to use a TMS chip with the DASC. The TMS chip was designed for NA right? If that's the care, you need to be careful as the chip will advance ignition beyond what you want and you'll have a serious detonation problem. Ignore that if the TMS was designed for boost, but I haven't seen one like that yet.

I DON'T recommend going higher that stock (7.5-8psi) boost without upgrading injectors. NickG's software is untouchable, he's the best in the business. His stage 2 and 3 eliminate the RRFPR and replace it with larger injectors, giving you a very solid AFR, plus a HP increase of like 20hp.

I'll be purchasing the stage 3 software soon, hopefully sometime in June, after my blower gets rebuild.

[kalimot]

what about increasing boost on DASC on an M42? i believe there's no software available for such

[ZeroG]

To my knowledge there is not an off the self chip for this. Back in the day RMS use to custom tune M42 cars, but there are some horror stories about them.

I have increased boost to 10 PSI and use lager injectors along with a piggyback computer. That is the only way that I know how to do it on an M42.

[DustenT]

Originally Posted by ZeroG

To my knowledge there is not an off the self chip for this. Back in the day RMS use to custom tune M42 cars, but there are some horror stories about them.

I have increased boost to 10 PSI and use lager injectors along with a piggyback computer. That is the only way that I know how to do it on an M42.

Chad - Take a look at this post regarding W/I on DASC: http://forums.bimmerforums.com/forum...highlight=dasc

I just found this today, looks like the same problem I'm having and it happened 2 months after installing an aquamist system before the blower.

[SnowTech.3]

This makes me even more curious. I am now wondering if DASC's Eaton's are coated or built differently than the OE ones on Fords, Mercedes, GM, etc.?

[318tiNC]

From this website http://www.itsallaboutspeed.com/products.html, about how much psi boost would you be running with the 3.2 pulley and would it even be possible to run this much boost with NickG's stage 3 software?

[DustenT]

Originally Posted by 318tiNC

From this website http://www.itsallaboutspeed.com/products.html, about how much psi boost would you be running with the 3.2 pulley and would it even be possible to run this much boost with NickG's stage 3 software?

3.6 = 9.5psi on a m44 and the 3.2 = 10-11psi (I think).

NickG told me he tested upto 10psi without any problems.

[318tiNC]

About how much power would you be getting at 10-11 psi (with NickG's stage 3 of course)? Would it be the same as the supposed 214 rwhp of the midnight autoworks stage 3 kit?

[DustenT]

Originally Posted by 318tiNC

About how much power would you be getting at 10-11 psi (with NickG's stage 3 of course)? Would it be the same as the supposed 214 rwhp of the midnight autoworks stage 3 kit?

I would guess right around 200hp maybe a little more. The MAJOR benefit to running NickG's software is that you get a redline bump, your ignition and fuel is totally tuned to work with each other and your factory knock sensors do what they are supposed to do.

MA's kit uses a standalone fuel controler to work the injectors. The fuel controller has NO idea what the ignition system is doing because they are tuned off of 2 completely different tables and are in fact two completely different systems.

If you are really good at tuning and have lots of time to spend with a wideband sensor, go the MA route. If you want plug and play (by one the most highly respected BMW tuners in the business) then go with NickG's software.