CAM TOO HOT?

[01GT281]

I am looking for an aftermarket intake that would fit a 2001 mustang gt. I am wanting to run stage 3 comp cams - specs:

advertised
IN. - 270
EX. - 274

@ .050
IN.- 234
EX.- 238

Valve lift w/1.82's
IN.- .550
EX. - .50

LSA of 113

I know I will need a new intake not just a plenum. Am ordering accufab plenum and 75mm tb plus 4.10's within the week. I already have full exhaust w/o cats and will be getting a tune. The heads they will be in are PI heads that are fully built (valves, guides, retainers, seats, and springs) with a DSS port job and 3 angle valve work. Should I not even do this yet and buy a milder cam until i have enough money to beef up the botom end? Reichard racing has one but it's like 1400 and mm&ff said it is made for super-high revs! I don't want to pay that for an intake. For that i might as well save a little more and slap on a blower. Have never been on a dyno and I do all the work myself (with some help if needed). Your input is appreciated and any advice would be greatly appreciated. Oh yeah, my car has 40k miles and I probably wouldn't tune it. Trying to stay N/A (maybe some spray). Thanks.

 

[nickthegenius]

I am looking for an aftermarket intake that would fit a 2001 mustang gt. I am wanting to run stage 3 comp cams - specs:

advertised
IN. - 270
EX. - 274

@ .050
IN.- 234
EX.- 238

Valve lift w/1.82's
IN.- .550
EX. - .50

LSA of 113

Those are the specs for the Comp Cams Stage 2 (XE270AH grind).

http://www.compcams.com/Technical/CurrentCatalog/HTML/66-67.asp

The actual Stage 3 cams (XE278AH) will cause PTV clearance problems unless you get really lucky and they will actually clear in your particular engine.

I know I will need a new intake not just a plenum.

My car (with XE270AHs) does just fine with the stock plastic PI intake, C&L plenum, and Accufab 75mm TB.

I already have full exhaust w/o cats and will be getting a tune.

Good idea if you want your car to run at stop lights.

Oh yeah, my car has 40k miles and I probably wouldn't tune it.

Bad idea if you want your car to run at stoplights.

The heads they will be in are PI heads that are fully built (valves, guides, retainers, seats, and springs) with a DSS port job and 3 angle valve work.

Sweet

 

[mogs01gt]

If these are going in a stock motor, dont do it. Going with a large cam like this one on a stock motor will hurt you more than help you. You probably wont see any power until like 5k with that duration and probably will need to shift at 7k. Its better to get a smaller cam with a stock motor because it will actually be able to use it. It wont move your power band soo high up that you cant even benefit from it.

I have 262ah's and dyno'ed at 310 to the wheels.

 

[D.K]

If these are going in a stock motor, dont do it. Going with a large cam like this one on a stock motor will hurt you more than help you. You probably wont see any power until like 5k with that duration and probably will need to shift at 7k. Its better to get a smaller cam with a stock motor because it will actually be able to use it. It wont move your power band soo high up that you cant even benefit from it.

I have 262ah's and dyno'ed at 310 to the wheels.

<-- Stock motor, stock heads, stock intake/plenum, mail order tune, Comp 270s. FYI the 270s don't move your powerband up all that high. If memory serves me correct, they run from 1800-5800 RPM, and I shift at 6200. I see plenty of power below 5K

 

[mogs01gt]

<-- Stock motor, stock heads, stock intake/plenum, mail order tune, Comp 270s. FYI the 270s don't move your powerband up all that high. If memory serves me correct, they run from 1800-5800 RPM, and I shift at 6200. I see plenty of power below 5K

well for one thing, his cams do not have the same lift the 270s do. Also, you would be the first person I have ever heard talk about the 270s and not shift close to 6500 or more.

Your car must be the first ever not to be change the powerband from a cam that has a 230+ duration.

edit:I said duration and I meant lift.

 

[dstrout]

What kind of power increase should come with a cam swap? I seem to remember a magazine article where they put comp cams and hooker headers on a stock 4.6 and picked up like 80 hp. Does anyone believe that? For $1500 or so, that seems pretty good.

 

[D.K]

well for one thing, his cams do not have the same lift the 270s do. Also, you would be the first person I have ever heard talk about the 270s and not shift close to 6500 or more.

Your car must be the first ever not to be change the powerband from a cam that has a 230+ duration.

edit:I said duration and I meant lift.

I don't have any intake mods on my car now, so my peak power is around 5500-5600 RPM. Using the "shift 500 RPM after peak power rule", that puts me shifting around 6100, so I shift at 6200. There's no need for me to take it any higher. I have tried shifting at 6500 and it doesn't help me at all, so why bother?
I never said my cams didn't change the powerband, I said "the 270s don't move your powerband up all that high." Peak power in my car was around 4900 RPM prior to the cams, now it's only about 700 RPM higher.

 

[nickthegenius]

I don't have any intake mods on my car now, so my peak power is around 5500-5600 RPM. Using the "shift 500 RPM after peak power rule", that puts me shifting around 6100, so I shift at 6200. There's no need for me to take it any higher. I have tried shifting at 6500 and it doesn't help me at all, so why bother?
I never said my cams didn't change the powerband, I said "the 270s don't move your powerband up all that high." Peak power in my car was around 4900 RPM prior to the cams, now it's only about 700 RPM higher.

Mine peaks at 5700 also with the XE270AH grinds.

In reply to an earlier post, those are the XE270AH specs in the first post except that I believe there is a typo on the Exhaust Lift. WhyTF would someone spec out custom grinds that are exactly the same as an off-the-shelf grind except short change themselves on the exhaust lift .050 (.550 vs. .5 stated above)? So he doesn't have to change the springs on the exhaust valves?