paizesb

HI guys need some help . Made contact with a company yesterday that said with the removal of the catalytic converter and a software upgrade would give me an extra 15% power on the wheels. Do you reckon this will be okay or is there any anything I should look out for . I am a bit worried doing the software upgrade . Any light shedding would be appreciated . Thanks

jturkel

what are they charging? jw....

also, i think that might be a bit high. just a tune with secondary cat delete. not sure if that will net you 40+whp. tuning is perfectly safe. just make sure it is a reputable company. what company is doing it?

paizesb

Hi Jturkel

I am South Africa and the company is reputable. The largest here . They guarantee all work done. Will any of these mods effect my service plan with MB

jturkel

no they shouldnt.

a tune will should be virtually undetectable by MB.
by deleting your secondary cats, the only potential thing that might be voided is a warranty on exhaust parts. thats it.

paizesb

Okay great thanks for the help

hooleyboy

Who is offering the tuning?

I think 15% gain at the wheels is alot to ask for in terms of WHP. Most C55's put down 290-295whp on a Dyno Dynamics dyno. So.... Lets do some math. *You can skip all this and go to the end if you want the quick answer.

295whp most tunes net you about 20whp give or take a few Hp's. so now you are at 315whp after the tune alone. to get 15% power gain at the wheels from 295whp you need to get to about 339whp. So what this means is you need to come up with about 24whp more to reach the 15% wheel power gain that is claimed.

If you are taking about removing the secondary cats that will net you about 10whp or so. If yo go totally catless then I have no idea since I've never done it, nor do I know of anyone who has.

Back to the math.... so now you removed your secondary cats and picked up 10whp on top of your 20whp you gained from the tune. Now your at 325whp Your 14whp away from 339whp or the 15% at the wheels gain.

* I dont think its possible to gain 15% at the wheels with just a tune and a cat delete. If you are totally catless again then I have no idea. What I do know if you go catless it will through a CEL faster than you can say C55.

AMS Performance

Not possible, like hooley said.

High flow 2nd cats net you 10hp/12tq.
Cat Delete nets you 13hp/19tq (as per hooleys dyno tests)

Software is usually 15whp (just to be conservative). so do the math you are looking at about 25wHP for realistic real world results, that's not anywhere near 15%.

paizesb

Hi
I am gonna contact them to confirm the cat delete. So you say they must only delete the one cause if its both it will eat through the cel. I will also get more info on the software upgrade . last thing I want is to be stuck with broken down c55 .Thanks for the help.

hooleyboy

Is that what I gained? I just have to many mods to remember what I picked up on the dyno. I've seen my cat delete thread floating around as of late. I'm honestly felling you on the C55 only getting 15whp from a flash. If there was an airbox or headers (or both) in the mix then 15% could happen (maybe).

AMS Performance

You know you have done way too many mods when you don't even remember how much each made or which mods you've done . Hooley, you starting to lose your memory in your old age?

Yes, you made 13HP/19TQ with 2nd cat delete as per this thread:

https://mbworld.org/forums/c32-amg-c...oved-dyno.html

Ya, for software 15whp is a good number, anything more is unrealistic. The 3 best power mods for the NA 55s are Headers, Pulley, 2nd cats. Once you've done all three THEN software makes good sense because there's more to tune for, but on a bone stock car, software really doesn't make much sense as I've seen numbers as low as 10wHP for software tunes which claimed significantly more.