http://cgi.ebay.com/ebaymotors/NXS-MOTORSPORTS-MANUAL-BOOST-CONTROLLER-MBC-TURBO-4G63_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q 3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem260303209344QQitemZ260303209344QQptZMotorsQ5fCarQ 5fTruckQ5fPartsQ5fAccessories#ht_4796wt_1113

Here is an E bay Threat, Read it and Vote YES OR NO

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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi

dude, anything on ebay is bogus

From the ad:

"Horse power gains of 10hp per 1psi are common on most cars."

No matter if that statement has any truth to it in the gasser world, I think its safe to say our turbo-diesels are NOT your common turbo charged vehicles.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

its plausable, kinda. its more like 5-6 hp per psi. since we usually run at 12 psi that would be 120 hp extra.. 5hp per psi would make more sence and would add an extra 60 hp to the allready existing 70 or so hp N/A.

But its still crap since you could run at 40psi on a T25 turbo and only see 300 hp, yet run 10 psi on a t4 garret and make over 800.

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

I dont understand. How could getting less boost to a motor give more horsepower than a different turbo giving more boost? More air being pushed into an engine=more horsepower. Theres nothing else to it. More pressure, more air, more horsepower. And yes, assuming theres more fuel.

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1981 300SD 512k OM603

thats where your wrong, not all turbos flow the same ammount of CFM at the same PSI. a larger turbocharger AR will flow MORE CFM at the same PSI than a smaller one. (meaning you need less pressure to get the same results).

Example,

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

No? Think of air as electricity. Reminds me of voltage drop


Less PSI, less CFM. Only because if your at a lower pressure, your not pushing as much air. Thats how it works! If your at a lower PSI, you push less cfm into a piston engine that consumes only a given volume of air. Higher pressure, more pressure in combustion chamber=more air in combustion chamber. If im wrong, please explain. Maybe i'm just missing something basic here

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1981 300SD 512k OM603

Cervan is right! Even though it's at a higher PSI, it still might not be flowing as much as a larger turbo at a lower PSI.

Case in point, my Supra with it's upgraded turbo makes MORE power at a 9 psi than it ever did with the stock turbo at 12.

Derek, electricity can't be compressed.

I'd say 10hp per pound of boost is a good rule of thumb, but isn't always true.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

A turbocharger is pushing 40lb's of boost into an engine running at 3000rpm

A turbocharger is pushing 10lb's of boost into an engine running at 3000rpm


That means that the 10lb compressor is only compressing enough air to get to 10lb's. Enough air as in enough CFM

For the 40lb compressor, that means that its pushing much more cubic feet per minute into the engine.

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1981 300SD 512k OM603

If both compressor wheels are the same diameter, then the compressor at 40psi will be flowing more than the same compressor at 10psi...

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

so the way you can get more horsepower is how well the turbocharger works to maximize the efficiency of the engine. By allowing less back pressure from the exhaust turbine, more air can be flowed through the engine?

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1981 300SD 512k OM603

no, by increasing the size of the impeller on the cold side increasing the amount of CFM pushed into the engine within its efficency range. A small impeller will spool fast but its range of efficency is drastically cut down (to where it starts heating the air more than its creating pressure) A large impeller turbo will spool slower but will be able to push more air at a lower pressure and at lower temperatures since its more efficient at this range.

__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

A more efficient design of turbo will have less backpressure on the exhaust also. This will help performance of the engine.

On my own testing, my 300D was running about 7 psi stock. I adjusted the wastegate to 10 -11 PSI. Yes this did improve performance, but MAYBE by 10HP total. Of course this is using my butt-o-matic 2000 series 3 dyno!!!

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Anything is possible if you don't know what you are talking about........

1985 Mercedes 300D
2007 Mercedes C-350
1980 Mazda Rx-7 (SA22C)
2005 Jaguar XJR
2007 Jeep Wrangler

electricity most definitely can be compressed! what do you think voltage is? it's the "PSI" of the electrons flowing through the wire... 120v 277V 7200V 14400v and 1.2Mv... massively more electrons in the wire at the higher voltage. lower voltage requires larger conductor or "plenum" to flow the same watts or "CFM" ... and if you push too much electricity or watts through too small a wire at too low a pressure or voltage, you get HEAT... and that impedes the flow of power and blows the fuse!

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

The only way you have 40psi, or even 10psi in the intake side, is if you're pushing excess air. The same intake volume, the same pressure, it's the same amount of air regardless of the size of the compressor.

"'80s" and Cervan both touched on the big difference, that is how efficiently the turbocharger is compressing that air and how much backpressure and heat the less efficient unit is returning to the engine.

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Gone to the dark side

- Jeff