Sulaco

haha yeah man. everyone always blames the poor numbers on the transmission but the diff ratio is absolutely sucking power. yeah it does crazy good at 80+ mph but that's where racing is dangerous and deadly.

with a 3.46 diff a 55 swapped C43 could blow away TONS of modern cars

cm60k

Exactly..........

ZAYED,,

MBWorld Editor

Awesome. Thought the front page would wanna follow along too!
https://mbworld.org/articles/breathi...amg-c55-motor/

DRBC43AMG

Yeah and it has been tried several times, but never heard someone getting everything to talk the same digital language If someone has really succeeded, then it must be in a very very hush hush environment I guess everyone on here would like to hear some more

hyperion667

sharp ride

snooozie

Try cutting out the "fins" on the airbox and using AFE Pro Dry filters or K&N. This might help with the airflow and get better oxygen to the engine hence might improve on your time.

speed43

Agrovain, check your private messages. Thanks.

RacingFish

Try cutting your 60' time, shave some weight (every 100lb saved can be a tenth of a second). Remember fuel weighs roughly 7lbs per gallon

benzslo

In drag racing its all about your 60'. If you're trying to squeak everything out of the car at the strip your efforts are futile if you don't have dead hook off the line. Get slicks and you'll run 12's.

Agrovain

So my C43 has developed a misfire on cylinder 6 but it only misfires at 6k+ RPMs in 3rd gear(under high load). I swapped around coilpacks but it's the same. All my spark plugs are new also. Does anyone have advice?

PJmak

Hey man text me again I got a new phone. This is PJ from Sacto

Btw did yoour car throw a check engine light?

mickey13

Well there is the video with the 202 and a 55k, so it looks like he had it in. The question is did he get it to go with the ecu or was he running it on switches and and a modified computer. Also we know he blew the engine, but I doubt that had anything to do with having it in the 202 (or did it).

I'll try to look over all of his posts when I have some time, this is a very busy week for me. Without wanting to get locked down into a build everyone is going to expect, I am thinking about sleeving the 5.4, throwing in forged rods and pistons, possibly switching out the cams with some other stock cams, and getting a blower. I dont think I really need to polish the heads, crank,,etc since its a blower but maybe I will since its all apart already. I'm also looking to buy a house and a couple more cars so project is suffering a bit.

Agrovain

So I recently dyno'd my W202 C55 and came out with some garbage power figures. The car was ran with a bad MAF and bad bank 1 sensor 1 Oxygen sensor. Also after the dyno on the way home my differential blew out. The oil coming out was extremely black and I think that's what caused the power loss along with the other two maintenance items needing replacement.

The car is currently in the shop and will be receiving all new parts. (Old diff had about 200k miles on it). Definitely the car should run high 12's with all parts being replaced. Hopefull... lol



Small video I made of the car:
Race with a C55:

Sulaco

I agree, those power figures look pretty low. IIRC a stock, healthy C43 puts down 249hp at the rear wheels and roughly the same torque. There's no way you're losing over 100 ft lbs of torque and 90hp in drivetrain loss. That's a 28% loss, should be no more than 15-18% loss, just spitballing. Some newer cars with super light manual transmissions (like mustangs) are only losing like 7-10%.

Not the first time I've heard of gunky rear diff causing power loss. I really should look into changing my diff oil, too.

In that race vid, I assume your car is the one farthest from the camera? What kind of car is the one with the camera? Also, if your car was running the same in that vid as it was on the dyno, pull that w203 C55 after your repairs for a good comparison.

DutchC54

wow... strange curve that is..
this is mine: https://mbworld.org/forums/c36-amg-c...went-dyno.html

PJmak

Damn thats a guge loss man.

I feel like mine is there with you. Definetly need a new maf and o2 sensors. Hopefully diff is fine.

Were you ever able to find a replacement?

Agrovain

I'm a little confused about your power figures, is what your showing crank horsepower because I can't believe your making nearly 400 wheel horsepower. That would be a record for this engine to be putting that much power to the wheels.

Agrovain

Yeah I found a differential.