Hi Teck-9

You could look it this from another direction , The Crossfire is based on the SLK r170 ( we all know that). So how about a skin panel swap , Did anyone see on US ebay that Xfire with a SLK(r171) front end , So i was thinking pickup a SLK 55 AMG 340bhp (panel damaged), You already have a Xfire , to me that would be a nice project if you are set on the Xfire look but neeeeed more speed & that V8 sound . You can get a SC for the 55 AMG & this will get to 500BHP + you have all the corect running gear (brakes / trans ect ). I know, i have the 55 AMG at the moment & the different from the 3.2 Xfire is very very nice . If they would have carried on with the Xfire & produced Xfire2 based on the R171 SLK i just hope this would have been in the line up

Cheers

Andy

 

[quote=rcompart]It's my opinion but I'd recommend Needswings any day over TVT. I've dealt with both and I can say that I've been 100% satisfied with Rob @ Needswings. Can't say the same for TVT. Rob will tell you what the product you're looking at buying will do and has the data to back it up. TVT has never posted a dyno sheet for a single product he has sold. He's always going to the dyno tomorrow if you know what I mean.

As for the injectors, there is nothing special happening and you don't just take them apart and change the internals to your liking. A select few companies can do this with their proprietary injectors but not TVT. He's sourcing the injectors from a distributor just the same as I or anyone else would. As for going with the biggest you can get, it won't make you more power but rather will do just the opposite and worst case, you run the risk of washing the cylinder walls and wrecking the engine. If you want to go with a slightly larger injector, you'd want to stick with something that is just a bump higher than stock. Remember that when you're looking at injector data, they are measured at 43.5 psi but our fuel systems run at 55.1 psi so that number is actually higher. The N/A stock injector data is 15.1 lbs/hr @ 43.5 psi which is equivalent to 17.0 lbs/hr @ 55.1 psi. The 5.0L V8 injector data is 18.75 lbs/hr @ 43.5 psi so if you do the math, it's aproximately 21.5 lbs/hr @55.1 psi which is a 26% increase in flow. In my opinion, this is too great a change. You're not running out of injector so there is no reason to change them. A tune will get them to where they need to be. Again, NeedsWings will get you taken care of in this department.

On to the fuel pump, they're the same between the N/A and the SRT6. If it will handle the needs of our injectors stock, there is no way you're gonna run into any problems with yours. If you feel the absolute need to buy a fuel pump just to say you did, get ahold of NeedsWings and tell him I'd like a walbro setup. He has my address. LOL I'll send you a nice little card and think of you every time I start my car. BTW, that was meant as a save your money statement.

Now on to the 80mm throttle body. Go big or go home right? WRONG! First off, the intake manifold isn't designed to for it so it would be the equivalent of running water through a fire hose but at the end of it, you've got a regular garden hose nozzle. Second, the intake manifold isn't designed for it so you'd have to machine out a larger opening, machine new mounting holes and then pray to god you got it all right and have no leaks. The 74mm is a great choice because not only will all your existing parts work with it, the intake manifold is actually designed for it and the two mate up perfectly. Just be sure to use a new TB gasket when you install the new one. The MB part number is A 112 141 13 80.

As for the race exhaust, just go with a magnaflow cat-back system if you want to mess with the exhaust. You might pick up a little power but exhaust mods aren't very drastic on these cars so no need to go with something off the wall. Lots of people have the magnaflows and are very happy with the way they sound and perform. You can even weld on the factory tips if you don't want it to look aftermarket.

Lastly, there is no need to go with the larger V8 MAF housing. You can save a few pennies by not buying it as the NeedsWings dual CAI comes with a matched MAF pipe. Part of the kit, tested and works like a charm just like the rest of his products. He has data to show how much better they flow compared to any other intake out there as well.

I know I've thrown out NeedsWings a lot in this post and a few of you are probably thinking I'm one of his nut swingers but the guy really does put a lot of time and money into making sure his products work and actually do what they advertise. He's also there if you run into troubles and need help with something. There is nothing he sells that he doesn't stand behind and if you need it, he either has it in stock or can make it/get it in stock as fast as anyone out there. Honestly, your best bet is to get in touch with Rob @ NeedsWings and talk over your plans and see what he can do to help you achieve them.[/quote

Teck 9 this is spot on. I even learned a few things from reading this. Great post Rudy!

 

So the needswings dual CAI that comes with the V8 MAF and 74mm throttlebody is the best start then. the only remaining question I had about that was how does it pick up air, the filters are straight up sideways. As for the exhaust, I like the dual down pipes and secondary cat delete of TVT. if magnaflow can do that too, that will be another product I am sure on. I also saw a member on here with a dual CAI that made a Y on top of the intake manifold and ran one big pipe to the TB from two in the front. I'd love to know more about that.
here it is https://www.crossfireforum.org/forum...y-s1030356.jpg

https://www.crossfireforum.org/forum...ne-bay-12.html

I think that the way the NW dual CAI tubes collide at the back might be less efficient than the angling Y pipes shown in the links. Plus, with the filter in the tubes, you could have the devil horns which I also think would be better. I don't understand how tubes running sideways at the back and in the front could be better than something that mostly flows longitudinal. plus the ones in the links just look brutal. I am enamored with that look. a big Y just stuck to the top of the engine.

 

There's no room to fit filters inside of the NW tubes and you can't position the filter any other way unless you get rid of the front grill. I don't think you have anything to worry about with the filters at an angle. They'll still suck in PLENTY of air.

 

pualscrossfire.com says that between the Needswings Dual CAI and the 74mm throttle-body that comes with it, there is a gain of 20 RWHP dyno proven. Right now my goal is 300 crank HP, so it likely ads around 25 HP. That's fanominal. $800 is a lot for a CAI, but when you consider the cost of the 74mm TB and V8 MAF housing that come with the kit not to mention the fact that its a very large, polished and high quality dual, plus its a massive gain for a CAI. Its a pretty good package, I think I want it. Black filters, high gloss black tubes, yep. The only reserve I have now is that I wonder if he puts things on sale for holidays. With my luck, I'll buy it for $800, and the next day it will be on sale for $649.

Here's what I think I know about upgrades and what I would like to do.
Stock________________$---- - 215hp
ECU Tune_____________$340 - 21hp Needswings, TVT, or Upsolute
Needswings Dual CAI___ $800 - 20hp Needswings
Under-pulley kit________$360 - 12hp Vivid racing, are there others?
Exhaust______________$560 - 12hp? Needswings, TVT, or Borla
Fuel pump and injectors__$60 - 5 to 10hp? Needswings
Plugs and Plug Wires_____$215 - 5 to 10hp? Needswings
Upgrades_____________$2,335 - 75 to 85hp
New hp____________________295 to 305hp

Can anybody help me find any errors or anything else that I can add? And are all of the stats on these sites RWHP? If so, can I re-add the 20% powerloss to the wheels to calculat crank HP since my current goal is 300 crank HP. And what do the Teflon coated valve covers do? Can any power be expected. Lastly, the TVT exhaust is a dual 2.75 inch and even borla is only a single 2.5 inch pipe. How much more power, if any, does the TVT exhaust have over Borla or Needswings magnaflow? And are the SRT6 exhaust manifolds bigger than the N/A? With the other mods, how much help if any will this give me?

 

If you think 800 is too much then contact Rob at NeedsWings and try to negotiate with him a bit. He might really help you out if your planning on buying all this at once.

 

You can't just add all the claimed horsepower figures for each individual mod together. I don't think it works like that....

 

Definitely doesn't work that way although sometimes the sum of the two parts is greater than them individually. Rare, but it does happen.

 

And it will happen because we're talkin the sum of about 12 parts. I don't think that adding 75 RWHP is that out of the question. A DCAI and 74mm TB along with an ECU tune is around 40 RWHP. Dyno confirmed. (See paulscrossfire.com) Well over half way there. Competition plugs and wires have to get at least 5 to 10. maybe 5 for the updated fuel regulator. Rudy probably has a more accurate estimate of those last few things. An underpulley kit adds 10-15. There are 3 options for exhaust, Magnaflow single 2.5", Borla single 2.5", or the TVT DUAL 2.75" with secondary cat delete. Is 20RWHP a bit high of a guess? I've learned that Rudy knows what he's talking about, so while you may not be able to just add up the numbers, with the above, we've gotta be getting close to the 255RWHP goal.

 

If you get the car dyno'ed after adding all the mods and you really do get 75 HP out of everything, let me know. I'll be following you.

 

+1, I am not trying to be too cynical, but I do not think that any combination of bolt ons currently available for the car will yield 75WHP, you are talking about a nearly 50% increase in power over the 150-170WHP they typically dyno at OEM. Keep us posted.

 

Well upon ordering mods, I discovered that Needswings is 15 minutes away from me. There is an exhaust system for the SRT-6 that is applicable to the N/A. This is 2 pipes that are each a half inch bigger than our single stock pipes. There is also a cut-out a foot back from the manny's on each pipe that has a switch operated throttle-body like setup that when open is essentially open headers. This adds 20 to 30 RWHP on a stock N/A. A NW DCAI with 74mm TB will add 20RWHP. Upsolute and TVT both claim 20RWHP for ECU tunes. An underpulley kit will get you 12RWHP. The updated fuel filter/regulator, NGK spark plugs, and magnecor plugwires together get 10RWHP give or take 2, so call those 3 things with the pulleykit 20 to 25RWHP. So that's 20 to 30 plus 20 plus 20 plus 20 to 25 is 80 to 95RWHP and since all mods compliment each other, I would say 90 RWHP, even and solid. So stock 175RWHP plus 90RWHP is 265 RWHP. I hate being misguided, so if anybody can find any discrepancies, please inform and not flame me to death.

 

As Rudy said, it does not work like that, Teck.

Also, very few XFs dyno at 175WHP, most are more like 160 and some even 155ish. I think your numbers are inflated and you are in for a surprise when you spend lots of money and throw it on a dyno. Please prove me wrong because I would love to have my XF at 250+ WHP

 

You have money burning a hole in your pocket?
If so, spend it, and be happy.

I can not guarantee you a 90 hp increase with all those mods, but I can guarantee you that there will be a big improvement in the way the car takes off when you stomp the gas.

Is your car an automatic, or a manual?
I would lay money on the fact that a manual car would show a higher hp number than an automatic car would, with all the same mods added.

Do yourself a favor.

Take your car to a shop BEFORE you get any mods added to it, and get a baseline hp reading. Then after you get all the work done to the car, take it back to the same shop, and get another hp reading, and tell us how much the mods add on all together.

But the main thing you are buying is that smile on your face when you stomp the accelerator. The smile will be big with all those parts added together.

BC.

 

Did you ever end up doing this, Teck-9? I'm talking with Rudy and Lantana right now about doing a V8 swap, and was just wondering how your success went with the mods, because I, too, was looking at the exact same set-up / paulscrossfire.com with all the stuff, before I decided on the V8 swap with a manual adaptation. Any updates?