I recently purchased a brand new X-fire limited with an auto trans.

Unfortunately, the SRT-6 is not available in my dealer so I was forced to get the stock 215 hp engine.

The thing is, there’s just not enough oomph!!!



What’s the best way to pump my engines HP up without spending a fortune? & Can the transmission handle the extra HP?

Specific part numbers & website advise are quite appreciated.



Another thing, is the transmission made by Mercedes as well as the engine & suspension?



tiger6150@hotmail.com

 

Best thing my friend is to search the forum...since all of the above has been discussed in great detail and should answer most future questions you might have...

 

Best to drive it to a dealer that has a SRT6 and trade!

 

A muffler will help, alittle bit and sound very good! BTW, why the slush box?! I feel the car is pretty strong actually and really shows its legs on the freeway, the joys of 3.25 gearing!

 

oomph = srt-6.
+
mods? - find some real ones and let me know.
+
Tranny? = poor imo.
tranny handling the power? = i'd play it safe and at least upgrade the clutch.

= Buy an srt-6 for $30k OTD.

 

Next time, push it a bit to see if the hp is adequate for you before you buy. For me, the Crossfire is the perfect mix of refinement, performance, and style. Modest prodding of the accelerator pedal = illegal activity. But for some people, it's not enough. Sadly, these cars are not easily upgraded due to a lack of interest from the aftermarket. A lightly used Corvette is much better in a straight line, and has many more parts available for it, but doesn't offer the same character as these art deco gems and doesn't have near the build quality.

Also, I recommend that you remove your e-mail from your posts. Otherwise, you'll get all kinds of spam. On my previous forum, spammers scanned through regularly to pick up this type of thing. Your PM account is a good way to protect your identity from those offering you Cialis pills, other male enhancement tools, phony mortgages, etc...

 

Most anyone on this forum in need of HP gain should consider flashing their ECU with new software. I see many sites now offering roughly 20/25 hp by updating the ECU by way of a laptop flash program. hooah Looks like the price can ranch from $425 to $1,000, plus S&H.

But if you don't have any money to spend on your X car let me offer a few back yard tricks.

(a) If you can get your cooling fan to cut on sooner and keep the engine cool you'll gain more HP by way of the ECU advancing engine timing.
(b) Run the highest octane fuel you can buy, that way the engine does not ping and the ECU will allow more advance timing.
(d) Replace your air filters with high volume air flow filters, such as K&N High Performance Air Filters.
(e) Turn off your traction control so your engine is more responsive coming off the red light, may not be HP increase but you ECU feels better about allowing your engine to suck in more fuel.
(f) This one here I'm not real sure about, we use to do it back in the old days, and it may be more trouble then it is worth. Rig up a can under the hood and feed your fuel line through it, then pack it with ice when you are ready to gain a horse or two. The ice keeps the fuel cooler as it enters your engine and therefore you get a better burn and power increase.

The best I can tell with the automobiles of today is this: Keep the engine cool, high octane, and timing advance. It's all about tricking the ECU. hooah

 

ecu's have been covered extensively. hddp also got headers, which would probably be the best combo for power, ecu and headers then maybe some exhaust. thats probably about 20 hp there.

 

I don't think he has the headers on yet, but I could be wrong, and his is tuned to run 100+ oct, A.K.A. race gas.

 

Been there done all, ECU + Benz V-8 airbox + more throttle push also leave in 3rd gear on autos! I don't want more noise, so no muffler change! But may pull off rear cats!!!

 

They're going on as we speak... The car is up on the lift and OEM manifolds off... Should have the new ones (Super Sprint) installed by Thursday if I get some time off work...

Damned chunk of change though... $2,250 for the headers and gaskets... And probably 8 hours of work by the time I get them installed...

They should show an additional 12-15HP after all is said and done...

As my mechanic says, "Horse power costs money, how fast do you want to go?"

 

If you are going to mess with the cats the best gain will be to remove the cats closest to the engine and replace the rear cats with high flow versions.

 

Dan:

Was thinking about removing the cats too but was waiting for another brave sole to try it 1st. Please let me know how it sounds if you do it.

 

You'll have to "trick" the 02 sensors with some aftermarket electronics that currently don't exist for the car. So I would wait until they are available before you eliminate the cats... Otherwise your ECU and FMU are going to completely mess-up the timing.

Patience, we're working on all these little things, but they take time...

 

Something similar to this was discussed a while back...

https://www.crossfireforum.org/forum/showthread.php?t=8821&highlight=cats

 

Actually, I disagree. My Mazda had the cats removed, and I can share how it was done without setting a MIL. Something is needed, but the electrical change is simple and not model specific.

The only O2 sensors affected by cat removal will be the downstream O2, as the upstream parts are in front of the catalysts. The O2 sensors will give a signal output of a little less than 1 volt when rich, and 0 volts when lean. This will switch back and forth with the front O2 as A/F is varied between rich and lean to keep the car near stoichiometric. The downstream O2 sensors exist mainly to detect proper catalyst operation for OBD purposes. With the cats removed, you will just need to dial the signal out (on the downstream sensors) to show lean operation. To do this, either you can make a MIL eliminator using some simple components from Radioshack (I forget what they are but I can find out if you are handy with a soldering iron), or you can buy one ready made for about $15 from another forum (Mazda3club has them). For me, it worked like a charm, no MIL in thousands of miles of driving. Since all lambda-type O2 sensors work on the same principal, I have no doubt that it will work on a Crossfire as well. Linear O2 sensors (UEGO) are a different story, but then again, these type are never used for downstream (OBD) purposes.

Let me know if I can be of any more help.