I'm putting together a write up for the Crossfire guys about modding their engines with OEM MB parts.

I figured the C320/240 guys would be interested.

INDUCTION

The Crossfire was plagued from the very beginning by poor induction. A small Airbox with 2.5” intake tubes was the best Chrysler could get away with as to not step on the MB owners’ toes. Once air is ingested through those “straws” it must squeeze its way through a 2.5” MAF, with 2 screens mind you, past a nice 3” elbow, unfortunately with some obstructive fins, and then finally through a 68mm TB, about 2.5”.

The stock system is limited by its smallest opening, in this instance it is 2.5”. Our goal is to open the intake up to 3” all the way through to allow more air and thus more HP potential. The following are a list of OEM MB parts that are bolt on and will result in a 3” overall size for the intake parts.

• C240/C320 Airbox: PN: A1120901501; this increases overall filter area by approximately 50%, Airbox volume by 35%, and increases intake tubes to 3”, a 20% increase from stock

• M113 MAF: PN: A1130940048; The V8 MAF is a full 3” design that allows for increased flow. Not only is it just a larger housing, but the MAF is tuned to run at the larger volume and thus will compensate correctly for the additional airflow. There are inherent issues with putting a non-collaborated MAF in a larger volume, this eliminates that.

• M113 Throttle Body: PN: A1131410125; The larger V8 TB is opened up to 74 mm and matches the inlet of the intake manifold perfectly. The engine will need to adjust to the new TB when first installed and a learning period of about 3-5 mins is necessary. Simply turn the key to the second position and let the TB calibrate itself.


FUELING

The stock M112 motor in the Crossfire is aimed at being a jack of all trades, master of none type of engine. It went in everything from a sports car to a SUV. To keep emissions at a minimum MB decided to keep the car at a fairly lean AFR. The stock injectors are a paltry 15 lbs/hr and on a bone stock motor are running at 80% duty cycle at WOT. This limits HP potential, but also makes for a good compromise of low end torque, low emissions, and decent MPG. Once you start ingesting more air into the engine the stock injectors quickly become inadequate.

Our goal is to increase the amount of fuel able to be added to the mix, thus allowing us a larger window for timing advance. More fuel + More Air + More Timing = More Power!

• 430/500 M113 Fuel Injectors: PN: A1130780249; These injectors are rated at 19 lbs/hr and are a great upgrade for a bolt on car. When coupled with the above bolt on intake mods and an aggressive tune, you can see anywhere from 260-275 HP at the crank. All the while maintaining OEM reliability, very good MPG, and low emissions.

• C43/C55 M113 Fuel Injectors: PN: A1130780023; These monsters flow 21 lbs/hr and are perfect for a highly modified crossfire running headers, larger exhaust, cams, and head work. These injectors will support upwards of 375 HP.

 

yeah, just out of curiosity I would be interested in ready and seeing what kind of write up you put together. keep us posted on any updates you have.

 

Very interested...

 

Stallion....you say "our goal" a couple times in your post. who are you? are you a company?

 

i find that pretty funny how crossfire guys "thinks" they're getting dooped.

in reality the M112.E32 are unchanged when they bolted into the R170 chassi which the X-fire has. The airbox inlet is not any larger on the SLK320/CLK320/C320 vs the x-fire.

the only "not stepping on MB's toe" move was rating the SRT-6 with lower hp/tq rating then the SLK32, but that's only on paper as ppl have found out.

 

Frank,

The C320 airbox is substantially larger then the SLK320 and the CLK320 uses an entirely different set up all together. But being all knowing, I'm sure I didn't have to tell you that...

 

filter area is smaller on the SLK however the difference barely makes any difference that's worth the upgrade. we're not talking about the M112 airbox vs the M112k airbox. the real upgrade would be the m112k airbox on the m112.

w209 clk320 has the same airbox as the c320. w208 has a different design. w208 has a horrific designed intake/airbox btw.

 

stallion8797 = TVT_Design

Notwithstanding some of DaimlerChrysler’s emaciated intake and exhaust systems fitted to the Crossfire during their ill-fated marriage of convenience, kudos to TVT for rummaging through MB’s parts catalog to source their potentially advantageous hardware. There is something about installing cleverly upgraded OE goodies that appeals to my desire to speak softly while carrying a big stick.

Done the same for current and former rides in an effort gain a stock appearing advantage over potential victims. There are more often than not several pieces designated for special service or RoW applications available from the various manufacturers’ catalogs that are, in fact, conveniently retrofitable. Recently installed some virtually undetectable CLK63 Black Series-specific chassis hardware. PNs shared in due course when their efficacy has been validated.

Previously called him out for being a shill or otherwise posting technically incorrect information. Do so again if need be. His NJ shop has subsequently proven to be a trustworthy service and upgrade facility by several respected members. Even our perpetually curmudgeon MBW moderator RBrenton is among his satisfied customers.

I’m of mind to cut him a little more slack this time ‘round.

Reference: https://mbworld.org/forums/c-class-w...hos-heard.html & https://mbworld.org/forums/c32-amg-c...ml#post3579772

 

I appreciate the kind words. The point of this post was to offer the current M112 owners a mod path that may be substantially cheaper and more reliable then what is offered via aftermarket. With more and more V8 engines showing up in junkyards, there are an awful lot of parts that can be had for cheap.

In response to FrankW, you are indeed correct about he W209 airbox being identical to the C320, I was referencing the W208.

I will continue to look into more retrofittable mods for these cars, but it looks as the next step will be tearing into the new M272 (many similarities) and retrofitting those parts.

There is ZERO profit in me handing out knowledge, so take it for what it is worth.

 

One more thing to add:

FUEL SYSTEM

CLK430 Fuel Pump: PN: A0004707894; The stock fuel pump is more the adequate at 160 l/hr to support up to 390 Crank HP (N/A), but for those of us that like to push the envelope and have added a little boost or nitrous, then a new pump is in order. The M113 (CLK430 used as example) pump flows a healthy 205 l/hr and will support upwards of 500 HP N/A or 380 HP FI.

 

Thanks for the info...but I have encountered a slight problem.

A while back I upgraded my '99 W208 M112 with the V8 TB. That worked like a charm, but after reading this post I bought a new BOSCH 0280217810 or MB A1130940048 M113 MAF. I disconnected my battery, installed the MAF, reconnected my battery and started the car. Now, it cruises fine, but whenever I lay into it the transmission doesn't seem to lock up at higher rpms and the shift from 1st to 2nd feels softer. It also threw a CEL the first time I gave it WOT. The CLK drives okay but because the transmission isn't locking up under WOT it is actually a little slower with the larger MAF. I'm stumped. Any ideas? BTW I hate to kick a gift horse in the mouth--the TB upgrade looks like it would help a TON if it would work correctly!

 

Use the m112 maf sensor in the m113 maf housing.

 

I'm very interested. Everything is just bolt-on? the 3 inch MAF fits and the throttle body with no modification?

Also, two questions.
1. Has this been proven to produce over 260 crank hp?
2. How much would this set-up cost? Knowing MB, the MAF is probably 350 dollars, the throttle body is probably 500, and the injectors is probably 200.

 

Yeah, it sounds like all is bolt on and reversible.

I too would like to know if anyone has done all or any of the mods and what their results were. As far as a process, i'm thinking first the airbox, then the TB, then the MAF, then the injectors/fuel pump, and finally a tune...how's that sound?

As far as prices...ebay is your friend.

Last question, can anyone comment on the ability to pass CA smog with these changes? I assume similar mpg as long as your foot is not too heavy.

 

Interesting that this thread has resurfaced lately...

Everything is bolt on and some of folks over on the crossfire forums have done this. I believe waveykat had a large majority of these mods installed (you can check his thread), but I dont believe he ever got the whp he was looking for as the auto eats up lots more power than the 6spd XF's that TVT typically tested with.

 

Lol ya almost four years since the most recent post. Just to clarify, for us C240 owners does that mean we can get a different airbox to increase airflow? Was a bit confused by the wording.

 

The c320 and c240 have the same air box which is really good at what it does and unless you are doing crazy mods won't be worth your time.

 

Well, aside from heavy modifications, this process seems like the best way to bring your C240 to C320 standards.

 

I just ordered a TB and MAF off of ebay. The TB was $50 and MAF was $22...I'll let you all know how it goes.

 

Hanknum, I'm very interested to see how it turns out. See if you could be able to do a before and after dyno test to show just how much you've gained.

 

Don't have the time for the dyno's...but I'll give you impressions from my butt dyno once it's done.

For the price, I really couldn't go wrong...if it doesn't perform, then I'll go back to my OEM setup.

 

I have in my e320 the m113 TB... the m113 maf sensor wont work, youll need to install just the housing with your 112 sensor. You wont feel any gains.

Why trying to get more air, when your exhaust cant flow off more air? if you want to go serious here you'll need a more "free flow" exhaust. And after that the car will ask for an ECU TUNE because of the mixture.

This guy from TVT is not a trusted source. He was banned from the crossfire forum, because of fraud on modding m112 engines.

In my case, i didn't feel any gain when i installed the TB, i compared my drag times from after/before and i just went .100 or .200 faster on the track, im not sure if it was because of the INTAKE MOD, or because of the preventive maintenance and a better car launch (im 80% sure it was because of the last one).

I have too much mods in my car, and all together work great, but i haven't experienced a really change with just one.

I enjoy moding my car and thinking what am i going to do next. I really enjoy feeling like having a car to my personality, different from others.

Some guys say is stupid to mod this engine, they will say "swap to 430" or "buy an AMG". But i really enjoy making tests and this kind of stuff. I really do.

 

OK, finally got around to installing the MAF and throttle body. The new units are definitely larger (I'll try and attach some pix later).

I put my old MAF sensor in the new larger housing...is this correct? In re-reading the original post, it is stated:

"Not only is it just a larger housing, but the MAF is tuned to run at the larger volume and thus will compensate correctly for the additional airflow."

Sounds like maybe I should have used the new sensor...

Also, is there better or larger elbow to use? Or, is it recommended that the internal turing fins be removed for better flow?

I did not do a dyno before or after so I don't know of any real differences. The new units are larger so in that respect, they should flow better. As for intake vs. exhaust restrictions...I don't know which is more restrictive, but this was a cheap and easy mod.

 

From what I know about the MAF swap, you should use the m112 sensor in the m113 MAF body! Check out the XF forums, there are lots of people over there who have done this swap and talked alot about the fins. Would love to see the pix!

 

Hey John,

Do you have a link to the XF forums?

Here are the pics...

I was just up in Seattle/Tacoma Tuesday and Wednesday for work...nice weather. I'll let you know next time I'm up there and maybe we can get together. I've met up with Glocati when I'm in Portland.