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10-08-2008, 02:10 AM
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There are huge differences between dynos. I can say that from what all we have seen down here with several P-51's, none have made 500rwhp. I cant see a reason not to mod one. You can always take it back to stock with the bolt-on stuff out there. I dont really see the P-51 being as much of a collector car as it was hyped to be. Its just a good base for what Roush should be doing from now on. I would tune that thing silly if I had one. Sorry to throw in on this. As for dealers knowing about a re-tune, I like the idea of having two PCM's. Just makes sense and if you ever have any issues, just throw the origional in. I think it makes it worth the money to have that kind of an option. Now here is a question. Does a tune void the entire vehicle warranty or just the powertrain?
__________________
 07 Roush Stage 3 #07-250 02 Saleen S281 #02-331 GONE 04 Mystic Cobra #386 
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10-08-2008, 04:26 AM
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Keeping this on the OP's question. I am not even sure that swapping PCM's would keep you in warranty. If the PCM can track flashes and dates, it wouldn't surprise me it can keep track of key or ignition cycles. In other words, you show up with a car showing 20,000 miles and the PCM shows, say, 50 ignition cycles on it, I am thinking Ford would have some questions.
Again, not sure about the Ford PCM's. I do know the Dodge truck computers track the cycles as a way of seeing if the computer has been modified. Just a thought. I would not be surprised if Ford can determine a PCM has just been put in a car.
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2008 Roush 428R Black/matte black stripes #75 0f 200 ROEA #A-642 2008 Corvette convertible Z51 triple black 2008 Dodge Ram 4X2 QC 1500 2008 Kawasaki ZX-14 - hell yeah, it's fast! 1999 Honda Valkyrie Interstate I refuse to participate in the Recession!!! Live like you were dying - Tim McGraw
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10-08-2008, 10:27 AM
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Μολὼν Λαβέ Si vis pacem, para bellum.
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10-08-2008, 10:43 AM
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10-08-2008, 03:07 PM
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10-09-2008, 05:26 AM
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10-09-2008, 03:29 PM
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I had my car tuned with x cal 3 and dyno.Dont think they did a great job ,car did not run smooth.Then a month later i could not get car to start.Had it towed to ford they said the pcm was completely blank/fried.They tryed to reflash it but a fuse in the pcm kept blowing.They gave me a new pcm it was coverd under warranty.They never mentioned the fact that i changed the tune.The only thing I had to pay was 50 bucs so roush could reflash it.Now I am afraid to mess with the computer again.
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10-09-2008, 03:35 PM
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__________________
P51A off-road exhaust & updated ROUSH tune  http://www.cardomain.com/ride/574408/3 360R 5,800k, Jack's sig on dash, 380 pcm, 2.8 pulley, MAC CAI, Flowmasters, S3 suspension, MAC c/c plates, Roush short throw 
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