Hey guys and girls!

As I am using a huge turbo on my 3.0 diesel whitch has quite a bit of lag, an idea blew in my mind. What if using turbo with supercharger? SC would make the bottom line VERY agressive and the turbo would take from 3000rpm to the redline (5500rpm). What to you think of that? Set-backs? As we talked in the another topic, the om603 IP with 7mm elements fuels the whole power band, and if the turbo is not producting any boost, the mixture is very rich...so the SC would help @ lower rpm?
the biggest issue is switching from SC to turbo...have to think this one out...some valves and AC clutch for SC maybe...

Please, tell me what you think, as far as I am concerned it should be pretty doable..?

sorry if my english is bad.

No ideas? What could be the main issues?

I think it has been done by the Fins. I know for a fact its been done on an OM617. search in the diesel forum.

__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

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This is probably what I will ultimately do with my car. Depending on your boost goals, you can run them in parallel or series. One drawback of running in series is that if you're using a positive displacement SC, it will choke off the air supply if it's drive belt breaks.

You should not have to disconnect the SC, it can run all the time.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Thanks for reply KarTek,

Lets say running in series, so how would be the best way? SC before turbo (supercharger will push air through turbo, basically feed turbo), or turbo pushing air through SC?
Or parallel? Lets say my SC is producing 1bar of overboost @ low rpm, say 1500-3000rpm, then the turbo involves whitch kick´s 2 bar of overboost, might I have a problem turbo pushing the air out through the SC in wrong direction?

We must think out the most efective way...

I would run them in series, with the larger turbo feeding the SC. Remember with each stage the theoretical displacement goes up. A 3.0l boosted at 1 bar ingests as much air as a 6.0l at atmosphere. The basic formula for pressure is: P1*V1=P2*V2. In the case of the formula, P=pressure, V=volume. A P value of 1 is atmosphere, a P of 2 or 14.7 is 1 bar. You just have to keep the values relative.

A positive displacement blower will not blow back as far as I know. I can't think of the combination needed to produce 3 bar off the top of my head (need to work it out on paper)

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250