Well guys and gals I've been on this forum for around 3 years now and have seen some amazing developments on visual and horsepower improvments on our beloved Crossfires...but have we hit a brick wall with the SRT in the power department?

I know this question has been asked before but is the SRT really limited to a low 12 second car or an occasional very high 11 if theres abit of tail wind?

I know i know you can get nitrous and go much quicker but thats not really that answer.

it seems people have given up and the real power hungry members just go straight to the V8 and the rest of us seem to be happy with what we've got?

From what I gather this is what we have...

The Cold Air Intake: whether you have the needswings, custom design, dual single they are all great and make our cars faster with more hp thats a given. tick of approval there.

The Pulleys: Same thing here, Code 3, 178, 181 etc etc.....we'd all have to agree although the bigger crank pulleys make more HP the q/mile times dont differ all that much...so another tick of approval pulleys work.

The Tunes: I myself have the InMotion tune..to be perfectly honest I went from a 12.6 to a 12.3 after my tune, after that I disconnected my battery then the next time round I could never get better then a 12.5 and never have since, whether disconnecting the battery or not had something to do with it I'll never know but it does seem my tunes somehow dissapeared. But all in all most of here have seen 2 to 4 tenths of our q/mile times with a tune so I guess the tune is also a proven power adder.

The above 3 as we know do work and do help our cars go faster some more then others but the numbers are there.

Now where do we go from here? headers were designed but no one reported on them so I'm guessing they were a FAIL? everyone here states that exhaust does not really help the car go faster, but it does add HP so thats another FAIL, intake manifolds in my eyes dont help because there are a few people that have them and there results are hardly different to those that dont have them...

so in conclusion to my rant where have we gone wrong? were apart of the lucky few that have cars that are incredibly fast from the factory but yet we cant make them into monster unless nitrous or a turbo is fitted

anyway i've put my thoughts in writing what do you all think? is there a way forward for the SRT? or will we forever been confined to low 12's lol

 

Well i think the engine is limited to somewhat from 400 to 450 HP.

What else can you do:
- Reduce weight. Every pound that you have to move uses power.
I.e. leightweigt rims, carbon race seats (the stock seats are really heavy), use a carbon hood, remove all wasteful fluids like the water for the window washer, fill up the fuel tank only to the minimum you will use for the race, Remove everything in the interior that you don't really need ...
- Optimize grip. Use slicks, use a limited slip differential.
- Optimize the traction control (which is really bad in the XF)
- Remove glas with acrylic glas (Makrolon)

...

 

I'm not into stripping the car but you make valid points. I really think our problem is the supercharger, the engine it's self isn't a limiting factor the turbo srt is proof of that. If the supercharger could handle it we could run a huge crank pulley with the code 3 and make really good power but it's obvious the s/c can't take it. A turbo set up would be great but very expensive. Any ideas on a direct swap supercharger? Something that can handle 25,000 + rpms?

 

the torque converter can be replaced with a high stall.
remodel the i/c to a top mounted version ala sls and you will get huge gains.
meth install
lsd for better traction
the exhaust from needswings is a proven winner. add mid length headers for more low end torque
tunes.... theres always new developments in this area so maybe send yours back to inmotion for a new upgrade
weight reduction... this is a great way to find speed without gutting the car. lightweight rims tires and seats to start. shuriken battery spares jacks and unneccesary tools out. lightweight rotors help. im thinking every 100 lbs removed =1/10.

all of this will get you into the mid 11's, however it comes at a steep price. that in itself is why most modders will jump on the nitrous or turbo train. its cheaper and priduces the same results.
if you want a 10 sec xfire you are gonna need 2 more cylinders. unfortunatly this is a sickness the need for speed!! what ever you end up with its never enough and the search forever continues for another 1/10th of a second!

 

Come on guys, your missing the obvious ...... CAMS! So who's going to pony up for a custom grind and then do a group buy? We really need more than one extra cam option, a mild one and a wild one. But with cams come tuning problems and sending the brain back and forth over the mail won't get'er done IMO. Also we need the impossible, long tube headers. But I've looked under the car and I don't know how it could be done. And if it could, it would cost the guinea pig $5,000 for R&D. (guessing)

Les

 

The t/converter hasn't been proven to make any gains, the only crossfire that I know that has one is the turbo converted one and no news has come from there.

The intercooler being on top would be unreal but that is near impossible with this s/c it has to be changed along with the s/c.

I had meth...I didnt notice any gains but in saying that I didnt have a tune at the time, however its still debatable as to whether or not the coating inside the supercharger will last in the long run with continuted meth use.

LSD I agree with you but we also need more power to make the LSD worth while lol

all the headers that have come and gone haven't proved any gains from all the reading Ive done unless I've missed something?

as for the exhaust from needswings im assuming your talking about the one with the cut outs? I remember paul (xray) did see some gains from that when the cut outs where open but we did have a long thread on exhaust cut outs that i started and I think most agreed that the cut outs will reduce power so i dont know what to think from that perspective.

I'm really looking into either having my supercharger's internals somehow forged or strengthend or getting a new supercharger thats stronger..then i'd like to run somehting like a 185 crank pulley along with my code 3 and that should be good for consistant high 11's

 

not sure thats the right track les. there has been a few in europe that added the shrick cams and the gain was tiny compared to the cost. as for long tubes also the cost isnt worth the small gain.

 

dont think of the t/c as a special addon for the xfire. think of it as you would modding any race car. t/c allows higher rpm launches which allow quickewr 60ft times which relate to faster et's.

the top mounted intercooler can be made its a matter of money. check out speedriven and search some of their top mounted installs. all custom made and not cheap!
exhaust mods again not cheap but we are looking at any gains we can find.
of course you can send your engine to speedriven and have the cylinders bored to 3.7 litre!! that will get you into the low 11's!

 

The trick is to find effective mods and do them as a community that will bring the costs down much like buggin with the LSD diff.

I've always like the idea of the t/c but the problem lies here, launch harder...more wheel spin. to fix that you need slicks but that will lead to snaping the diff, so the LSD is a must if adding the t/c...I also wonder what the drivability will be like, I know eurocharged say its perfect but I'd love to hear from someone who's got one?

 

Exactly, the cost. The headers I've seen were all shorty's. I'm sure you've seen the gains the kompressor V-8 owners have gotten with long tubes. Amazing hp. I really don't have a way to know but I suspect that the Schrick cams were designed to be civilized for someone's wife's daily driver and not for weekend racers. It really doesn't matter what's next, it's going to cost so much that most won't even try. I'd love the Carbon/fiberglass hood but I'm still chewing on the cost vs. 30 lbs. of weigh saving vs. looks. It's all about the Benjamins.

Les

 

apples to oranges les. you cant compare what the l/t did for the v8 and expect that to be the case with the v6. different torque curve and hp curve.
i think kleeman has cams for you to drop in but at almost 3k$ its just not worth the cost.
if you want to drop 30lbs off the engine just get a shuriken battery . theres 30 lbs of savings for under 100$

 

Already have the 13 lb. battery. The cheap stuff is done.

Les

 

I know where I go. I strive to preserve my SRT6 roadster in the best condition I CAN. This means no racing, or use in salt. Plus I Waxoyl everything. Including the top and leather. I did laminate the dash console and add a bit of peel and stick outside. I do my 11 seconds on my Triumph. Gary

 

I think one of the biggest things holding the Crossfire back on the 1/4 mile is its gearing, NA or SRT. I mean come on, these cars still have the "Mercedes" mind set. If ya can't drive a 150 mph all day long on the autobahn what good is it?
Well here's a news flash, this aint Germany!
Until somebody figures out how to get around the "Mercedes" programing, (that puts the car into limp mode when the differential is changed to a "lower" gear ratio) I don't think there are going to be any 9 or 10 sec. Crossfires.
I don't drag race anymore myself. But I'd still love to have a 3.73 rear end in my NA car. Even though (with a 6 speed) 1st. gear would almost be worthless, in an automatic (with an aftermarket CAI) 13's would be a distinct possibility.
Just imagine what a SRT (with slicks) could do with 4.10 or 4.56?.

 

The diff gearing is a set back, personally I'd be extremely happy to have a consistant mid to highish 11 second car without any form of nitrous or even meth and no slicks or stripping of the interior. I'm not what you would consider a drag racer but I just want to get in my car and know what its capable of it's that feeling of knowing you have a super fast car that just makes you feel so empowered

 

Cracking the code on the TCM and the ECU would be the next frontier.
We need gearing changes, shift point changes, and some way to fix throttle lag.

 

no way you get 11's without dr's!! to much torque for street tires. i know my car is super fast and anybody that rides with me and experiences a 0 to 150 mph blast agrees. for the 1/4 i keep it on the track and dr's are a necessity. i have given up street racing due to the street tores worthless off the light

 

My brother in law says the same thing, but there are many cars that do 11's without dr's, the Nissan GTR I know it's 4WD but stock tyres, the Corvette ZR1 just to name a few...if you have enough power you can afford to take off nice and easy then apply full power to get a good q/mile time.

 

gtr worthless for the track! with the trans toasting itself in race mode and killing any warrenty its a fast looking non racing car. zr1 whole different animal. 500+ hp from the factory v8 allows for softer launches. also has lsd standard and huge rubber for oem both cars in excess of 85k$ also!!
try to think in terms of what is comparable to your car. without dr's you just cant get traction. you guys are lucky you can stuff big rubber in the wheelwell. the best i can do is a 255 wide and try to get traction. thats why i dont even try without dr's

 

Just like everyone tells the NA guys to buy an SRT6 when they want more power, when the SRT6 guys want more power, they should talk to Rudy about the V8 swap.

Either way, it sounds like you SRT6 guys will be dropping a lot of coin to take the SRT6 further so why not spend it on the V8 where you can bring up the power to well over 600 bhp relatively easily?