check out this Vortec install on a 4.3L 2001 Benz, http://www.mbworld.org/forums/showth...9&highlight=sc

first m113 motor I've see with a vortec, looks nice! now who's gonna bolt one on your m112?

work was done by House of Power in LA, the cool thing is that his car is using the same Motronic 2.8 ecu in your crossfire's. as we all know the 4.3L are the same dimensionaly as in the crossfire's motor, just with 2 extra cylinders.

Apperantly they are using the stock motronic 2.8 software, no tune was done to the car, just colder plugs. F-ing amaizing!




some more cool info.

"There is a guy running a piggy back system and claims it gave his car more power.He is using the stck green fuel injectors in his 5.5L M113 motor.

Here is the link: http://www.mbworld.org/forums/showth...90#post1346490 This piggyback system I think is the same exact one Adam at HPS is using with there kit.Don't quote me on that HPS comment but I inquired about this many months ago when I was swapping out my 4.3L motor for the 5.5l motor. (I will list the system because i have it in an old thread.Speedybenz is the one who first mentioned the system to me and I did further research.)To my surprise the C43 4.3L motor uses the same size and color injectors as the AMG 5.5L N/A engine. So as a result I didnt need the piggy back and just reflashed my Stck AMG ECU with E55 files.Now the car theoretically thinks and runs like a C55. Oh here is another link! http://www.geocities.com/gregcclk55/" qouted from projectc55

 

They do turbo kits as well and we work with the same ECU company.

If you have a V8 MB this is the place to get your work done. Expect big things from this company.

 

funny thing about the Kleeman software, I hear it's also a stock Oem tune.

 

Now we know the stock block @ 10:1 compression can take 8 psi boost without boost retard! Nice find Maxwell! This really builds my confidence about boosting the Crossfire. BTW, did you notice that the fuel enrichment was done via rising-rate FMU only? Sick...think about what the system would do with standalone...

 

wow that is a sick set up have not seen anything like it on an MB

 

FMU 4 mercedes SC
http://www.geocities.com/gregcclk55/FuelManagement.htm



Split second MAF calibrator

http://www.splitsec.com/ this is used on a 430 with Magnusun SC
here is a picture.

 

qoute GregC

I played with the new split second unit this week on the timing run. With my OBD-2 unit, I found that the WOT timing is around 20 degrees, going to 25 at 6K. This is about the same as most all 4-5L cars. I set the timing retard high to see if it worked, while looking with a scope. All is great.
I have setup the unit for 1.5 degrees retard per pound boost. I will set the final air/fuel with the MAF conditioner when I get the new pulley.

What I did find out "please read" is that the 5L 11:1 engine starts to Detonate at 3psi if the air/fuel is 12:1 or higher. BE CAREFULL ALL!

what that means is that all of us with any type of blower DO need a FMU that increases fuel pressure, thus in turn lowering the A/R ratio in boost.

Most all the blower people will say a conservative is 11.5:1 A/F is ideal. If you feel good you can get 12-12.5 with race gas or methonal injection.

I hope to complete tuning sometime just after Christmas and get to the Dyno.

I can say that I am impressed/not impressed with the Powerdyne. The Powerdyne has a mush better boost curve than the Vortech and Procharger, which I have had in the past. It' still not a roots unit, but it has done well. I have found the the BD-11A unit is at about max RPM on a CLK55. IF,IF I am able to get 8psi with the new pulley will be a test. I am on the edge, as I must say I am impressed with the air flow abilities of the Mercedes 5.4L.

One more, to keep fuel pressure up with boost, as the FMU is supposed to do, requires I set the boost-a-pump to 25% increase in voltage. That is about 15 Volts. Since I am at about 75psi at full boost that means those pumps I found may work. You may be able to use a FMU and upgraded fuel pump in place of the kenne-bell boost-a-pump. I am still not 100% such with a system runnign 7-8psi boost.


I wish I could find a machine shop to make a bracket and 1-2 curved tubes. The cost of this system is not that much. I hate to see blower unit systems selling for $3-4K for all the other cars in the world, and the few that sell mercedes units charge 8-15K!!

 

actually I think the stock motor should still have boost retard, on pump premium. I'd rather loose 10 hp than burn holes in pistons.

 

Is the srt6 motor the same as the n/a crossfire?

What i mean is besides the s/c are the rods/pistons/heads/cams/valvesprings/valves/block/etc the same?

I would expect that the pistons on the n/a are higher compression and probably the cams are different. Also, forced induction motors usually have extra oil squirters compared to their n/a brothers, can anyone confirm if thats the case with the srt6?

Im looking for definitive facts from someone who researches this stuff all day long...like you guys

 

I believe it has been posted before by HDDP if I had to guess.

I know they are lower compression, but I'm not sure if it is in the heads or in the pistons (or both).

SQ

 

I beileve the srt6 has a different water pump and oil pump, also lower CR pistons, and I think different connecting rods. as for the details on the heads I'm not sure. needs further investigation.
I was told AMG heads have cleaner ports for air flow, but this is hearsay. I need to look up the parts manual on the cams, and the valves and springs are the same I think.

other than this both engines have forged crankshaft and forged connecting rods.

 

I see that the horsepower is bigger above 5000 but if it is 2 cyclinders more than a SRT6 why is the power down below our 330? I can only guess that the power is wheel but I have seen others dyno above 300 hp also using 6 cyclinders.

The loss of bottom end power is significant also, Woody

 

different superchargers make power at different rpms, centrafugals have a small light weight impeller compared to the AMG blower that has alot of mass which also causes belt slip at higher psi.. centrafugal doesn't have the surface area and spool speed at low engine rpm to move volumes of air, so output is a bit weak in the low rpms.

the SC m113 the guy had built is probably still not tuned as well as the srt6, which in another project, I've been asking around to see if it's possible to use the srt6 ecu in our 6 speed cars. still waiting for LantanaTx to complete the 4.3 v8 swap.

 

you want something badass?

here you go http://mbworld.org/forums/showthread.php?t=222631

 

4.3L M113 stock engine is 275hp at the crank.

3.2L M112 AMG is rated 354hp at the crank @ 1 Bar boost.

The guy's dyno chart is showing a 20% drivetrain loss on the N/A run. Assuming the same carries over to the boost portion, his boosted car is putting at 412hp at the crank @ 0.55 Bar boost. That's almost exactly 1.5x the power with 1.5x the air pressure.

If intercooled and running 98+ octane pushed to the same boost as the AMG 6-cylinder, he'd be making 2x the power or 550hp crank/ 440hp wheel (assuming that his supercharger could efficiently blow that mass of air.)

The M113 is not a great V8. It's the old SOHC design that we have on our Crossfires, not the newer DOHC V8's with 32 valves. It doesn't rev high and therefore its horsepower will always be limited.

 

lol, m113 is a great engine.

 

OK! oK!

 

SRT and N/A internals are different. The part #'s on the whole rotating mass are, but I believe the heads are the same minus the cam.

 

the connecting rods are pistons are different. but both have forged cranks.

 

yes they are both forged, but they are different, I can give you the part #'s if you would like.