so the question is I have intake and exhaust so far on the x fire and next mod I was thinking either nitrous or a speedinnovavtions ecu program. Both cost about the same and obviously I can't run both being the program advances timing but timing and nitrous = boom. so what are thoughts or is anyone even running spray on their xfire's? It's hard coming from an 11 sec srt-4 where there is tons of aftermarket to no aftermarket parts. Also what is the most power put down in an n/a xfire?

 

heya welcome to the ex SRT-4 owner club. it may be disappointing in the straight but doesn't it make up for it in the corners ? it does for me ... (had a '03, stg 2, 3 in thermal r&d, yadda yadda yadda) ...

but anyhow, the only nitrous kit on a XF i have seen is a member that is not very technical so not sure if its for show or go ... as far as most put down ? sorry to disappoint but again none of the members are HP obsessed like the skittle crowd was so hardly a dyno sheet for bragging right to go with around here...

but i have pondered the same as you ... nitrous kit would require that you do a little research and see how the TPS wire reports its values as the traction and ASM program kicks in ... if when they detect spin/slide the TPS sensor correctly shows the throttle closing then you can use a TPS activated nitrous kit such as the one ZEX and a few other companies are making now ... otherwise you may have to find another safe way to activate it as the results would be pretty bad if the kit kept spraying as the ASM program shut down your throttle. or perhaps a better way would be to create a relay arrangement that would disconnect the YAW sensor, deactivated the traction control, and armed the nitrous switch all together... however HDDP has reported seeing issues with being able rev past a certain point with the YAW disconnected if i remember right but then another member had success doing so in his car. so there is plenty of research to be done to use nitrous to its full potential safely on this car and engine but the results should be spectacular.

 

I am actually glad you were the one I was hoping to see post on this thread. So many on this forum are against performance it's weird to me... anyways why not do a push button system, and just turn off traction control with the switch or not spray while cornering? what do think would be better? Also are people really picking up alot of ponies just off a ecu reprogram? I really want to see 300 hp to the wheels I don't think it should be that hard... anyhow just some random thoughts.

ps. on the srt-4 thing when I first bought mine there were none to be seen threw an agp 50 trim on it and was the fastest. now they are literally everywhere, so it ended up being nothing special to have. I am like 1 of 4 or 5 crossfires in my whole town and none are owned by anyone under the age of 50 so they are not modded at all. I want to show some people that these cars can be fast.

 

It was me that pulled the 2 40 amp fuses for the ESP programming and still redlined.

http://www.youtube.com/watch?v=RwRK97G2lFM

The only problem I had was the lack of ABS and BAS! Oh ya...I found that my tires seemed to wear quite a bit faster!

Just my $.02 But If you want strict power...then the nitrous is probably the way to go..but the new ECU will always have power, not like the N20 which only works as long as the bottle is full.

 

you will run into a issue doing a strictly button activated system ... mainly cause when you hit the traction control off button the active stability program is still on, any squirm in either direction will set it off and your throttle will shut down hard but your finger will keep spraying until you notice ...

thanks for replying Apkano ... that gives an idea ... 40 amp fuses, hmm, buy two 40 amp relays with heavy duty pigtails/sockets and wire the relays in to cut the power to the fuses at the flip of a switch ... this way you can tie it into the nitrous arm button so when you arm you fully shut down the traction and stability program ...

i would still urge to do a little research by trial ... pull the fuses, do some donuts in a parking lot to see if the now famous yaw sensor is still active somehow ... i am assuming no since the main ESP feed is dead which i also assume the yaw sensor communicates to. HDDPs posts as well as Woodys posts will reveal more info on that as they are the leading authorities on that.

the other potentially dangerous (to the electrical system) experiment is to see if shutting down the main ESP power feeds while the car is running can be done without anything being damaged ... this is assuming you want to be able to arm the nitrous system while the car is running... if not i can design a small circuit utilizing latch relays and a momentary push button switch to make sure the nitrous system can only be armed or disarmed with the car being turned off...

btw, my design for this (i have a venom nitrous kit from a previous car i may scavenge parts off of to build a kit) utilizes a TPS monitoring nitrous activation switch that would make sure the throttle is really open before spraying, and window switch that would make sure it only sprays from 3k to redline to prevent damage from bending rods at low rpms or running lean as it hits the rev limit, and a push button switch to make sure it only sprays when my finger is on it ... so basically all the conditions have to be met and i can tap on the button when it lights up ... it makes for a very very safe system that prevents user error in the heat of combat ...

 

btw to anyone wondering .. as far as i am concerned this is all for track use 1/4 runs so i am not concerned with BAS or ABS being deactivated as there is ample stopping room at any good track...

 

but technically you COULD pull the two fuses and then a push button system would work right? there would be no esp you would just not want to slam on the brakes.

 

yes technically you could ... but if you spray below 3k by accident you may bend the rods or if you spray at the rev limiter point you may grenade your block ...

 

As far as I know, I'm the only one that currently has nitrous in the crossfire. As my friend intenseblu said I'm not a subject expert on it. But I love my wet shot of 75 HP to the wheel. The system is a universal EFI kit from NX. I use it in combination with the Upsolute remap. I have written on this subject at my site (link below). I want to help who ever is interested but will not respond to any more accusations or criticism.

 

hmmmm...interesting. the only prob I have with nitrous is the stress on the motor and it being mercedes will cost some serious$$ to fix. But intenseblu you have a speedinovations program on your x fire don't you? did you notice extreme difference? also do you know if I have to dyno it to reprogram or do I just send it in?

 

as well there should be none ... you're the only one with the "jewels" to go for it ... would love to see what you run with and without nitrous back to back at the track.

 

i have not done the reprogram due to dreams of boost or nitrous ... so right now its sitting stock as i tinker with ideas and items i purchased in my garage.

you just send the ECU in and they send it back with the new programming ... dyno tuning would yield maximum results but they get very close to promised hp this way and the cost is not as high.