Celicasaur

My friends in the UK tell me that a decat and tune is near enough the same power on the dyno as a set of headers and a tune. Apparently the car will put down between 555-560hp (crank) with a decat and solid tune, whereas the headers and tune will net around 560-570hp, maybe slightly more.

Is there a great deal of truth in this?

(FWIW i've got a W212 E63)

avery.whss

I think I'm one of the only people who've fully decatted their car on here (its not legal in like 95%+ of the world)...be careful with those claims, you'll have everyone and their mom calling you a liar because they automatic assume you c63 is bone stock without any mods.

Anyways, my car put down 470whp / 489whp on different days/dynos and then again with 460whp on another dyno, thats fully decated with some other mods though, row boxes, pulley, upgraded diff, custom tune, and probably some other crap im forgetting ...be warned though i think fully decatted is actually louder then headers or just as loud

deadlyvt

I'm not sure on this however those numbers seem roughly about what I would expect as most of the performance gains comes from the major restriction removal which is the primary cats...

gzim335

for the 25th time you don't make that power without lth and cat delete on stock mani is nowhere near lth loud.

Celicasaur

Interesting. Thanks for the insight. Pulley...are you referring to the underdrive crank pulley? Presumably not the Agency Power one as that's too new, but the Evosport one? How many miles on your car and do you drive it hard and have had no issues?

This is what I've heard too and from a very reputable tuner over here in London. Basically I'm told that longtube make big power largely because they instantly force a decat which as you say, is the main restriction here. Perhaps there's a few extra HP to come out from it, but for the extra amount spent in UK money (which would be nearly 3k USD just for headers before fitting) then perhaps a nice decat and tune might be the best way.

FYI I've got a W212, so a decat for me, would certainly be a full decat, hence why it would make close to the 560+ crank power that I was referring to.

Hmmm...interesting...wondering if I should just save my money and do the decat/tune, rather than headers/tune.

avery.whss

i love how you think 550 crank HP = less then 400whp

http://www.dragtimes.com/Mercedes-Be...lip-22565.html

430 WHP TUNE ONLY. T-U-N-E only..Do i need to spell it out for you again or bold it in size 9000 font?

gzim335

listen man I know you think your car makes w.e u say but the truth is much different
I met a guy the other who had a custom dyno tune n a mustang making 430whp and said he redynoed on a another md n got similar numbers...
he had cat delete with a xpipe he said,you can check my instagram n see his page too
lucky for me he was local and I couldn't wait to get a run with him
im driving my friends c63 forum member here MTHIS
oo for the record camera car put down 440whp on a dynojet like 3 days ago lol which would mean under 400whp on a mustang or w.e ur math says about bhb but heres the outcome of the race enjoy

gzim335

anyways I hope you get what im trying to tell you,dyno numbers are good to see gains from a baseline otherwise mean nothing...

mthis

heres a videos of the dyno .

w204nyc

Haji did you run Gzim yet? I'd think you can hold him off till about 110-120

gzim335

hagis beast is as fast as it gets n/a wise but if I can get traction I don't think it will hang bro

avery.whss

dyno's aren't even to be taken seriously like has been said 100's of times..we all live in different cities with different variations of things..you're on the east coast..im on the west..etc etc.

im not sure why do you assume i have the same mods as everyone else? Lol....I have no cats, and the EC pulley from like 2 years ago..So 2 things that your buddy with the x-pipe doesn't have, there you go, I bet hes still running a stock diff also which is pretty sloppy @ putting the power down...im not just running an x-pipe with a tune..like you for some reason think i am, my car might pull a bit harder too because the top end has basically been rebuilt twice.

the C63 does not have a 20%+ power train loss...around 18% is what the techs at benz told me.

Jasonoff

I'm starting to see a pattern here. Your oil temps are spectacular, defy physics with absolutely no oil consumption, and make abnormally high power for the mods you have.

Your car is just very special. Either that or you are.

mthis

not yet but i doubt i can hang. c63 stg3 pull very hard.

avery.whss

91C is pretty average for a c63..you do realize I live in a country that doesn't rely on a imperial system right.....Lol...And not burning oil isn't that hard when you don't drive your car daily, plus I have a catch can like i said in the other thread

theres been a ton of other people who've posted dyno sheets/videos and 1/4's times of them running just a eurocharge only tune and put down 400-430whp - TUNE ONLY. Even Eurocharge has had a bunch of 420+ whp cars with just EC V5, no other mods, and thats on the east coast where the air is complete junk, I even think a C63 dyno'd 400+whp stock last summer or the summer before, I think that was kristons actually and it was like 418whp stock or something around there.

im not sure why you guys keep thinking my car is bone stock just running eurocharge V5..i have no idea why..maybe you guys are reading some other dudes posts

Anyways AMG is building a track in my city, I'll be sure to run the 1/4 once it's finished next year.

MTV10

Who cares about dyno numbers. They are only good for calculating gains based on your baseline.

Look at the video above.... their dyno numbers were very similar... but Mthis' car pulled buses on him.....

avery.whss

Oh my...I think you boys need to go back to grade 1 and learn how to read...Lol.

OE Tuning Custom | Dashdaq Zeitronix | AR LTH | MAXPSI Cat Back | CF Airboxes | aFe PRO R Filters | CF Intake | 180F Thermostat | Weistec Catch Can | CF JBSpeed Lip | CF diffuser | Revozport side | DADS CF Hood | DADS CF Trunk | Driver + Passenger SPARCO Racing Seat | FORGESTAR F14 | 245F/315R Toyo 888 | HMS Wide body | Tikore Lugs | Girodisc Rotors | Porterfield Pads | Teflon Stainless Lines | Camber Kit | Toe Link Kit | Quaife LSD | KW V3 |

Are ALL mthis mods

Vs

C63 with custom tune and xpipe

No **** shirlock a car with all the mods like mthis has pulled on just a Tune only x-pipe ...Who even knows what custom tune that guy is running...I run OE's custom tune and I'm sure mthis can agree it does pull hard

I HIGHLY doubt a "tune only x-pipe" put down the same numbers as a LTH OE custom tuned car.

You guys are comparing apples to oranges...seriously..Lmao...thats like racing a bone stock C63 when you have a stage 3 blower then **** talking the stock c63 because its "slow" like WOT!?!?! The logic on this forum gives me so much AIDs/Herpes/Cancer.

if you want want something to compare too put mthis car up against another LTH c63 or fully decatted with similar mods with a OE tune or EC V5 or Velos tune and THEN compare..don't freaking compare a cheap little x-pipe mod with a $700 tune to a basically fully bolted on c63

Celicasaur

...so in conclusion....a full decat and tune is near enough the same as a set of longtubes with a tune, except you save a couple G's on the outlay for the longtubes.

Thanks guys. I might rethink my strategy now. Maybe I'll just leave the longtubes and do a decat and tune with crank pulley. I'll keep you posted.

johnnyblaze

What I've learned with these cars/motors - Stay with what is tried and true.

Usual bolt-ons (headers, tune, filters, airbox)
Weight Reduction (remove spare, lightweight seats, lightweight rotors)
Power adder (supercharger, nitrous)

Forget dyno's, they are just for tuning.

I wouldn't do the crank pulley. I doubt it makes much if any horsepower.

Most of all enjoy the car.

gzim335

long tube headers are the best thing you can do to these cars along with a good tune,no its near or same as a set of long tubes its about 30whp peak on a dyno but also whole curve is moved up huge difference on the street.

180sx

i have thought about this set up as i really would like to keep the heat down around the engine (middle east weather) . i might do it . will try to post if its done

whipplem104

I do not know if things have changed since I was playing with these. But member superlubricity and I did a step by step. Years ago dyno and track times. You can look up his threads. I can tell you that the headers made a huge difference vs just catless. The cats are not the biggest restriction in my opinion. The manifolds are. The cat cross section is pretty huge The manifold opining is tiny.
He had plm manifolds that were a little larger opening than stock and there was not much difference between no front cats only and no cats. Maybe a couple hp and 1mph trap speed.
Just my experience.

180sx

Would like to share






My set up is decat Mike's H pipe (thank you Mike)
Sound. .......addicted never go back (unless if to sale the car)

180sx

this is morning start up.

https://www.dropbox.com/s/5vdk96bse9...53121.mp4?dl=0

C63AMG2011

Nice get a vid of you running the car. Good alternative for those who don't necessarily have the money for longtubes. Just the sound alone will make the mode worth it and put a smile on your face even if it doesn't give you that much of a gain.