StabMe

Hi guys.

It turned out that the problem i've been having is actually low pressure from S/C - only about ~1000hPa which is even less than the reference range (>=1300hPa, according to Star Diagnose).

So... the solution is simple - replace the S/C. the unit itself is very expensive and i found a used one for just about $1300. The problem is - it was installed on SL55 AMG 2004yr. The shop owner says that they are idectical and that i shouldn't worry. Now... i wouldn't worry, but it has a different part number. According to dealer's software, the part number for my suupercharger must be A113 090 02 80. The guy who sells it has an S/C with a P/N A113 080 02 80.

to add to the confusion - according to the dealer's software, both SL and CLS has an S/C with the same P/N - A113 090 02 80.

Any suggestions?

skratch77

slow down buddy.

When you said your iats were 68-70c was that driving around? anything over 140F and you car is going to dump fuel and slow you down.

Your temps were 160F and I had those temps with a dead pump at idle and would hit 180F on a blast threw 3rd gear.

your supercharger will read lower boost if you have done exh work,you metioned you took your cats out,that will lower boost pressure.

Edit try this as its the best way to find out if its not your blower.

let car sit over night and in the morning reset the ecu with a scan tool and clear the LTFT long term fuel trims.This will clear the massive fuel your car is dumping becasue of the 70c it saw.

then on a cold car drive it around for 2 min to let it warm up a little and then do a first gear blast and see if it makes a difference.Im willing to bet that it will break the tires loose and after the temps hit 70c again you will be back to where you are now.

If your cooling is working you should see the aits rise and fall quickly down to about 6-10c above the out side temp.

can you also list what mods you have? are you on stock boost? I didnt even hit 160F (70c) the other night going down the 1/4 mile and my aits started at 89F and I peaked at 148

StabMe

Skratch, thanks for chimiong in.

the IATs were in fact very low. I was able to add a LITRE of cooling water to the system. I/C circuit is separated, too. IATs are now in 48-51, no higher.I did a few WOTs but it feels the same.

Now... i did remove the cats but when i saw it didn't change a thing i removed them back. So the pressure today is ~1100 instead of ~1400 it read yesterday. Star says it should be higher than 1300 or equal to.

Now... the supercharger that is currently installed on the car was once removed and repaired because it produced a lot of noise, because of the damaged bearing (maybe i am using wrong word). The guy (a wizzard) who did the repair said that this unit won't be able to produce as much pressure as before. Here are the photos i took:







So... Now, that i ruled all the other possible reasons (even the fuel pressure reads 0.5-0.5 and doesn't drop on WOT), i think i can conclude that it is the S/C.

No?

StabMe

Oh, and i don't have any mods except separated I/C circuit which i have to refill via that small outlet designated for bleeding air.

Yacht Master

Wow that blower looks bad. Hate to tell you but it is shot, rubs and scoring on the rotors indicate FOD first then possible bearing failure. What kind of air filter was in that car?

StabMe

Well, just regular MB filters that could be bought at the dealer.

What is FOD?

Yacht Master

FOD= Foreign object damage, that means something passed through the supercharger causing damage to the male and female rotor as well the housing they rotate in. The secondary damage to the supercharger is the bearings that endure excessive loads when an object passes through the rotors in mesh. When the bearings give the housing will suffer excessive wear from the rotors not being held on center. Like your mechanic said the original supercharger will not performe with in spec because all internal surfaces have been damaged and are now undersized.


http://en.wikipedia.org/wiki/Foreign_object_damage

StabMe

Thanks for clarification.

Does any one know the normal air pressure that supercharger should produce while driving?

ahmad0658

Is that a hole on the right hand side of the supercharger? On the right rotor?

StabMe

That's right, Ahmad.



So I am waiting for a used s/c that will hopefully solve the problem.

The only thing I am worried about is the compatibility - the one I ordered was installed on SL55. But according to MB parts software (forgot the name. WIS?) - both cls55 and sl55 should have the same s/c.

tgoss

Holy **** that's trashed. Sure does look as if something got sucked in...

AFAIK the SC should be compatible. Good luck

Yacht Master

What model year are we talking about? I know that early (03) SL superchargers had a non bypass "Y".

StabMe

SL 55 AMG 2004 year and CLS 55 2005.