Pre and post Crawford header dynos YMMV
I found out the hard way after the Crawford header install, 12 hours of ball, bolt busting fun.
I felt the 4800 feet above sea level (Utah) was killing any gains the headers added. Funny" it only took 8 hours to get them off. (I still have the scares on my arms to prove it) Very disappointed with the low end,drivability the headers produced. I agree a plug change is in order here with a header install.
My thinking is the cam timing is just killing the gains that could be normally had.
Just by retarding the exhaust timing by 2 degrees would get the exhausts ports flowing better and would move your peak power up a few hundred rpm's. The factory cams aren't bad at all, they are just degreed in to hold the exhaust gases in to be re burned. (smog stuff) I went with an intake retard 1.5 degrees and 2.5 degrees retard exhaust. Surprising" I lost no low end torque, plus drivability is great. Maybe a dyno down in Southern California is in order at Church Automotive. Sad" that such craftsmanship engineered headers didn't get the results on my rev-up.
Dennis
I felt the 4800 feet above sea level (Utah) was killing any gains the headers added. Funny" it only took 8 hours to get them off. (I still have the scares on my arms to prove it) Very disappointed with the low end,drivability the headers produced. I agree a plug change is in order here with a header install.
My thinking is the cam timing is just killing the gains that could be normally had.
Just by retarding the exhaust timing by 2 degrees would get the exhausts ports flowing better and would move your peak power up a few hundred rpm's. The factory cams aren't bad at all, they are just degreed in to hold the exhaust gases in to be re burned. (smog stuff) I went with an intake retard 1.5 degrees and 2.5 degrees retard exhaust. Surprising" I lost no low end torque, plus drivability is great. Maybe a dyno down in Southern California is in order at Church Automotive. Sad" that such craftsmanship engineered headers didn't get the results on my rev-up.
Dennis
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Joined: Jan 2007
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Originally Posted by jbone
Crawfords are the best, so I hear, but with all of the "breathing" mods on NA engines, I'm convinced that you'll get no more than 10-15 hp. Don't get me wrong, I like the mods (setting myself up for SC soon), but I think these mods suit best "collectively" for FI, headers esp SC because of fitment. I think I got to a point of diminishing return with all of the current mods I have, feels like some torque is lost, believe me, I hate to admit it. Again, just my opinion.
who says they're the best? just because they're the most expensive........
Anyways, I have kinetix cats, MD 1/2'' spacer, topspeed headers (and a bunch of other junk) - did the headers+cats together and got solid gains across the *entire* powerband, no losses anywhere. Oh, but wait, topspeed is chinese junk supposedly so I should loose power across the entire band because I didn't pay $1000 for my headers and didn't need to have the engine pulled on the install
Originally Posted by 2EFNFAST
who says they're the best? just because they're the most expensive........
Anyways, I have kinetix cats, MD 1/2'' spacer, topspeed headers (and a bunch of other junk) - did the headers+cats together and got solid gains across the *entire* powerband, no losses anywhere. Oh, but wait, topspeed is chinese junk supposedly so I should loose power across the entire band because I didn't pay $1000 for my headers and didn't need to have the engine pulled on the install
Anyways, I have kinetix cats, MD 1/2'' spacer, topspeed headers (and a bunch of other junk) - did the headers+cats together and got solid gains across the *entire* powerband, no losses anywhere. Oh, but wait, topspeed is chinese junk supposedly so I should loose power across the entire band because I didn't pay $1000 for my headers and didn't need to have the engine pulled on the install
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yosip1115
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Jul 22, 2015 01:47 PM
