DASC power increase (%)

[M42_Jester]

MM 2.1l  8K +
DASC     3K +

For over 11K, not really

That would almost get you a 95 M3 for instance.

I suspect you could get 90% of the joy for 1/4 the money.
I wonder what ROB_E30 has in his engine.

If all you worry about is the money and not the end result (having a 4-cylinder monster) then of course it won't excite you.
Who would you rather be. the guy with another E36 M3, or the guy with a custom tuned M42 that would put a 95 M3 to shame?

I choose the latter

Jester

[DesktopDave]

Jester, your argument does sound like it holds water.  Personally, I have no expertise here, but I'd figure your estimates are in the ballpark.  As long as the S/C isn't running outside of it's performance envelope...they only push so much air.

I don't think a 2.1L would overwhelm a small blower like the DASC.  It would be pretty unique.  The cost gives me pause too.  It's a lot of risk & cash considering potential  benefits, but you'd have bragging rights AND quite the beastly little car...

[doitover]

If I were dealing with unlimited dollars, I'd have someone build me a carbon fiber replica of an e30 with a 2 inch chop, 6-speed, and an ls6.

If I had 11K to spend, I'd probably have a decent rebuild, the DASC, 6speed, and spend the rest on the suspension. I'd probably still have something left over. This is assuming the suspension is in good shape to begin with. If not, I'd start there before touching the engine.

While you are scheming though, I'd consider using one of the newer Eaton superchargers. They have a bypass system based on engine demand instead of the mechanical system the DASC uses. I haven't seen one but I suspect you could end up with a lighter setup as well, which would be nice since that weight is high up on the car.

If all you worry about is the money and not the end result (having a 4-cylinder monster) then of course it won't excite you.
Who would you rather be. the guy with another E36 M3, or the guy with a custom tuned M42 that would put a 95 M3 to shame?

I choose the latter

Jester

[pdxmotorhead]

The DASC is an eaton, the bypass is vacume/boost operated not a mechanical linkage to the throttle. If the standard DASC is too wimpy, there are larger blowers in the eaton line, you'd just have to adapt them to the DASC manifold. I think the DASC was a Eaton M47 the Eaton M62 is about 30% more capacity. Both blowers are out of regular production, DA is phasing them out last I heard because of this. The newer eaton is different shape and size so does not fit in the same hole as the older units.
Note: A lot of this is just acquired from other forums and such so .... YMMV

If I were dealing with unlimited dollars, I'd have someone build me a carbon fiber replica of an e30 with a 2 inch chop, 6-speed, and an ls6.

If I had 11K to spend, I'd probably have a decent rebuild, the DASC, 6speed, and spend the rest on the suspension. I'd probably still have something left over. This is assuming the suspension is in good shape to begin with. If not, I'd start there before touching the engine.

While you are scheming though, I'd consider using one of the newer Eaton superchargers. They have a bypass system based on engine demand instead of the mechanical system the DASC uses. I haven't seen one but I suspect you could end up with a lighter setup as well, which would be nice since that weight is high up on the car.

[doitover]

On mine there is what looks to be a mechanical connection from the throttle body to what looks like a path around the compressor.  Apologies I have been misleading.  I went out to have a look at mine after finding an article in Pelican's book describing it. Mine does have a vacuum valve controlling the bypass. It looked to be tapped into a port on the throttle body, which seems wrong. Anyone have one that they could tell be where it is tapped into?

 

The DASC is an eaton, the bypass is vacume/boost operated not a mechanical linkage to the throttle. If the standard DASC is too wimpy, there are larger blowers in the eaton line, you'd just have to adapt them to the DASC manifold. I think the DASC was a Eaton M47 the Eaton M62 is about 30% more capacity. Both blowers are out of regular production, DA is phasing them out last I heard because of this. The newer eaton is different shape and size so does not fit in the same hole as the older units.
Note: A lot of this is just acquired from other forums and such so .... YMMV

[pdxmotorhead]

Its normal for the vacume actuator to be plumbed to the intake manifold or on many ,, it just plumbs to the flange of the blower housing. The newer eaton blowers have the whole bypass integrated to the blower. From observation on a couple it looks like the thing closes the bypass as soon as the intake manifold is at a neutral or slightly pressurized state. Magnessun is the re-builder for eaton products and has a lot of good technical info on their website, Including pressure curve charts on the units.

Fun stuff!

Dave