Here's a guy who added a blower on his '93 MB 300E. The engine in the car is the M104 inline 6 from which our M112 V6 engine was derived. It's a nicely done setup using a Rotrex blower and some minor fab work. It might be worth a look for those of you wanting to add forced induction to your Crossfire. The guy posted lots of technical details.

The car dyno-ed at 323 RWHP, 275 Lb/Ft of torque.

http://www.mercedesshop.com/shopforu...d.php?t=169695

 

Less work than fabbing up crap: Factory Supercharger

Though the real problem is the electronics and fueling. The older 93' MB's didn't have these crazy Bosch ECU's that control everything from you fueling to the gravitational pull of the earth. I think the only way to effectively do fueling at this point would be a piggy back ECU of some sort, but even that is un-proven and theory is that the ECU will use O2 feedback to try and maintain a 14.7 afr....which would be death for an engine on boost.

 

Yeah, the article mentioned using an Apexi piggy back ECU. What caught my eye was the fact that the Rotrex supercharger is nice and small and doesn't require a whole lot of changes to the stock intake plumbing. He even had it fixed up so that he can bypass the supercharger if he needs to. Overall, a nicely done installation.

 

Also, I just looked at his setup, and the physical layout will not work on our engines. He mounted the supercharger in place of the secondary air pump, our secondary air pump is electronic and mounted on the intake manifold. So the placing of the supercharger that he used will not work for us. And as a side note....his belt alignment is off and will cause reliability issues. More than likely due to the mounting bracket flexing under load. You can look at his belt in his pics and see that it's pulling funny and causing it to wear unevenly.

 

there is plenty of room in our engine compartment for the rotrex, and even more room for a vortec SC if you relocated the overflow tank from the radiator.

Check out the guys dyno, it's not even tuned very well from the gragh he posted, it should be a lot smoother and could probably make more power if tuned properly. I could probably smoke him in my stock Limited crossfire, that car needs serious tuning! He's hardly making 200hp and about 150ft,lbs. at 4200rpm!

good find, it does give hope. I will have to look into the Apexi ecu he's using.

 

I have used the Apexi AFC, Apexi Super AFC and Apexi Super AFC II... They aren't worth it. You already mentioned how horrid his tuning was, that is because the Apexi AFC is fairly inadequite. If you want something that operates in the same fasion but is 10x better, look at the Greddy E-Manage Ultimate...

(note, I have not used the Apexi Super AFC Neo, but it's just a newer Super AFC II and wouldn't be worth it in my opinion either, even though I don't have direct experience with them).

 

Anyone serious about doing an FI setup should look at this:

AEM UEGO Controler

It will control 2 wide band o2 sensors and it has a secondary output that emulates a narrow band sensor. So you can replace the 2 pre-cat o2 sensors with wide band units and see your real AFR and then at the same time have the UEGO send the narrow band signal to the ECU to prevent any trouble codes.

To correspond with this you would need either an ECU (or piggy back) that used wideband o2 voltages (0-5v) or you can simply use a wideband guage like this one:

UEGO Guage

If I ever got the freetime to do a boost app on this car I would use the AEM UEGO along with the Greddy E-Manage Ultimate.... The E-Manage will actually use an AFR target map when combined with a wideband o2 sensor to automatically keep your AFR's at whatever you want (12:1, 12.1:1, 13:1, etc etc).

Greddy E-Manage Ultimate

However I would still be worried about the Bosch ECU fighting the Greddy ECU and causing all kinds of problems. But we will never know until someone tries right!!

EDITED INFO FOLLOWS

I just found this:

AEM FIC

It was designed as a piggyback fuel and ignition controler for vehicles with a CAN-BUS system (like our cars). I have used the items I listed above with great results but have never played with this. It looks really interesting. I have also used AEM's full blown standalone EMS with GREAT results, so if this has any relation to that device it might be worth looking into.

 

I agree there is more than enough room for a rotax, paxton or vortec for us to put in our engine bay, I just said:

 

how much does the Greddy E-manage run about? if it's more than $1600 it might be cheaper to have HDDP's Bosch tech guy programn the 2.8.1 motronic ecu to match your car's vin, heck he only charges $400 and hour. I will have to ask HDDP about this before jumping on the piggyback ecu.

 

E-Manage is like $400, but the E-Manage Ultimate (the one you want) is $600, though you can find them on sale for like $5-550. The new fangled AEM FIC is the same price range. But you put in the cost of the wide band o2's you will double that (obviously). So total out the door should be $11-1200, but then you have dual wideband's, which is great.

Also may want to wait and see what LantanaTX's Mercedes tech can do with unlocking the ECU, if he can do it then a SRT ecu in a standard X-Fire may be the way to go as well for boosted apps.