xolinlevh

So total newb to ECU tuning stuff, what can rennetch get out of a C300? im in MN and dont believe there are any dealers here i could go ask =/

Trek1200

Sorry kevink2. Yeah it's a Sport. Only way to go for the w204 in my opinion.

Trek1200

Most places are getting an extra 15-20 out of the C300. I think Renntech is getting about 22hp out of their tune.

xolinlevh

lookin on their site that runs $1300?

Trek1200

That sounds about right. Anyone know what other companies are charging?

wnunez89

the renntech tune for the w204 c350 only yields about 10-15hp there gains are a little exaggerated (told by a renntech employee who is no longer with them). they didnt offer a tune for the c300, if i remember correctly. but the turbo c250 should be able to get better gains, even more if the cats are removed.

Trek1200

Could be. Their techs and website are telling me 22 hp increase for both C300 and C350 W204s, but you're right, the turbo should have much better yields. What effect will cat removal have?

wnunez89

on any force induction car the cats hold back/restrict alot of the power, removing the cats, and running a free flowing downpipe/test pipe will improve better exhaust flow from the turbo, their for improving the TQ/HP. example I also have a 2.0t genesis coupe (my weekend car) I did a full turbo back exhaust. removing cats and replacing them with a 3" downpipe, and my gains were about 22hp, couple that with a tune and your talking about 50+ hp/tq gains.

Trek1200

Reeheeeheeeheeeallly? Interesting. I may have to look at doing the exhaust as well as the ECU. The only downside is that I wanted to do a quad exhaust if i did anything, but (I may be wrong) i dont know if that can be done cat-less.

wnunez89

Of course you can, removing the cats has nothing to do with what muffler set- up you wanna do. the cats are basically right under the engine, you could even remove the cats and still use your stock exhaust.

If you wanted to do a custom quad exhaust you could: remove cats replace with a straight pipe, run straights to an X-pipe, then 2 pipes running from that too 2 mufflers with 2 tips on each muffler. wouldn't even cost more than $1000

Trek1200

Well hot damn! We might be in business then. I have yet to actually see what the exhaust setup looks like, so im not sure what sort of cat setup the car has, whether its a cat off the header or closer to the muffler/midpipe. I need a bolt on bc im leasing the car and need to be able to return the car to stock.

xolinlevh

10-15? boo, was hoping for more then that, 25ish would be maybe worth it...but not dropping $1300 for 10 hp lol

kevink2

Also need to consider car inspection, if applicable. In Delaware, they do a visual check to look for cats, even use a floor mirror. They also tap an ecu access port to check emissions that may trigger a Failure, if no cats are used. On the 7, I got away with a DP to replace the 1st cat, but used a high flow 3" cat in the 2nd position.

With the 7, Mazda used a weld bead ring inside the 2nd cat to reduce the oem bore from 2.45" to 2.25", a significant hidden restriction!
Check out another 1.8T, add the proper www prefix:

ww.atpturbo.com/root/releases/release050304.htm

.

Trek1200

Virginia doesnt smog, so I'm safe there. I'll have to find out about that cats and whatnot.

nlpamg

yup! that's why I said if Renntech did a downpipe, then that may give some good power.

on my GT-R, the secondary cats are in the midpipe. I replaced my stock restrictive midpipe with a catless HKS midpipe and noticed a pretty good gain, not just in sound, but also in power. the primary cats in the downpipes are next to be replaced. my only issue is that the GT-R already smells like fuel with the secondary cats gone, the fuel smell is going to be horrendous with no cats at all and I'm going to get soot on my bumper frequently. but, the ability to throw flames from the tips makes up for that.

AdidasC230

you said this was a lease, do you plan on buying it out at the end? How are you going to source all the repl parts if you turn it in?

Trek1200

I'll have to ask them to look into what that would take to do a cat delete/ quad tip exhaust.

Trek1200

I plan on selling the car before the lease is up, so I won't have to get replacement parts.

alexis.jones

These are my results from my c320 cdi and thats just from a remap here in the uk

kevink2

********** 467 ft-lbs !! **********

Are you sure that's not a misslabled Nm readng ?

.

alexis.jones

Thats good old diesel for you lol

kevink2

If that's ft-lbs, then look at the usable range; 400 ft-lbs from 2200 to 3500 rpms. It's like thay droped an oldsmobile big-block in there!

Trek1200

Damnit! Why can't we get something like that in The States!?!?! It's not fair!

alexis.jones

She pulls like a train

Trek1200

I have no doubt. We just sold a 2012 S350 Bluetech and that thing had more torque than most people know what to do with. It was incredible!