Blk_96_GT

the PI 5.4 has 260hp and 350tq so does that mean that the mustang uses diff cams in the 4.6 then the 5.4? should i keep the 5.4 cams or swap them for my 4.6 NPI cams? i think i would like having the 350Tq for now and then later geting some copm cams does any one know for some good cams that will give me good power between 2800-6400 Rpm's and whould i have to do some valve train work to rev to 6400?

David_K

6400 on a 5.4L?

02StanGT

LOL. Yeah I would recommend it, unless you want it to break. That's what the rev limiter's for.

Blk_96_GT

when does the 5.4 rev limiter kick in? my 4.6 is at i think 6000

02StanGT

Not sure, but if you're using your 4.6 computer, then the redline will be 6k. I was just saying that the rev limiter is for stopping your engine from flying apart, should it be attacked by a forgetful lead foot.

Blk_96_GT

how hight should i rev the 5.4? would it be ok to shift a little past 5500? and alos what do you think i should do about cams?

jdaniel

Your RPMs all depends on your valve train. You can replace the stock valve train with stage III cams, better springs and a good P&P and you can rev it to 9000 and not hurt a thing. But you have to reflash the computher to do so and have one hell of a rear end gear to get you off the line. LOL

Acer2428

There's no way a stock roatating assembly could handle 9,000rpms.

jdaniel

Im sure it wouldnt. My poiunt being that it is all in the valve train and not just in the ECU and so on. I think that Code said that he can rev his to 7500 with the Stage II cams if im not mistaken.