pony23 said:I put on LT headers and I got a very flat torque curve through the rpm range. But they did hurt the torque up top. Look up (went to the dyno on friday) in the past message board for the results.
You have basicly the same engine minus those cams. They are cheap at about $150 a cam and the stock valvetrain is fine. That is why the Mach 1 gets good times at the track.
Mr.DOHCtor said:... As well as them having 03 Cobra heads with bigger exhaust ports...
markt1968 said:Everyone knows the plethora of mods for our cars that add power. Pulleys, timing adjusters, intakes, MAF's, throttle body's, headers, exhaust, x/h pipes, chips, etc, etc. There are a handful of mods that will increase power across the band, but many mods sacrifice low-end power for gains in the higher RPM's.
What bolt-on mods will yield the best LOW-END (dyno-proven) power on a 99/01 4V?
well, the Mach1, Marauder, 03 Cobra, and Aviator all use the same 4v heads...sleeper89 said:...i read before that they were 5.4dohc navigator heads. does anybody know for sure (not that it matters, i'm just curious).
-steve
:canflag:
How do you know they hurt the torque up top? Do you have pulls with no other changes except headers that show this? If it did hurt torque up top, it would have also hurt HP.pony23 said:I put on LT headers and I got a very flat torque curve through the rpm range. But they did hurt the torque up top. Look up (went to the dyno on friday) in the past message board for the results.
Mach 1 also has different heads, a different intake, a bit more compression, different EEC tune, and likely a few other minor things.Also the Mach 1 cams are supposed too give you more low end torque too ( I don't know the exact cam specs). You have basicly the same engine minus those cams. They are cheap at about $150 a cam and the stock valvetrain is fine. That is why the Mach 1 gets good times at the track.
Much easier question to answer:markt1968 said:What bolt-on mods will give you better performance across the entire RPM range?
There are no "bolt-ons" that are going to help low rpm power and hurt high rpm power - at least not of any significance.AND what mods will HURT you in the upper RPM's?
markt1968 said:There are a handful of mods that will increase power across the band, but many mods sacrifice low-end power for gains in the higher RPM's.
Bob Cosby said:Much easier question to answer:
Full Exhaust (probably best mod)
Custom Chip (probably second best - if done on a dyno by a competent tuner)
Pulleys (minor)
CAI (minorer)
Ahh, yep, very true...AzSnake said:Don't forget folks the Mach's also have a higher C/R as compared to the 96-98's and the 99-01 Cobras. Thats helping that TQ and hp bump. It's not just the cams or the heads or the revised intake on the Mach. It's got some major differences.
I thought the Mach1 with a manual tranny had the Cobra's forged steel crank and the autos had the iron one?pony23 said:The Mach 1 cams are the same as the Nav. 5.4. I found them at www.fordpartsnetwork.com. The intake was changed a little to fit the shaker. I just found out about the compression ratio difference (9.85 Cobra and 10.1 Mach 1). The Mach 1 also comes with an iron crank instead of a steel like the Cobra. The exhaust manifolds are portmatched to the heads too.
As for my headers, I got them from JDM for $750 but you don't have too lift the engine or drop the k-member to put them in. I know the engine gets better torque readings stock from postings here on Stangnet. I attribute my lower flatter readings to the headers.
Also checkout www.karkraft.com in the modular area for engine parts. They have a good selection of parts too.
Hey lafear, can you get the FR500 cams by themselves in the event that someone already has the valve springs to accomodate the higher lift? What would be the cost?
Thanks!
Todd
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