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XP or S1X

humm so they all seem about the same except after 5000k. thats when they start to shine. i dident quite get that graph tho. is that like numbers punched in and stuff. is this fairly acurate??
 


blowfishRus6 said:
humm so they all seem about the same except after 5000k. thats when they start to shine. i dident quite get that graph tho. is that like numbers punched in and stuff. is this fairly acurate??
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I doubt the accuracy, but it is what it is, an estimation. Real world they are definitely not the same below 5K.
 
I've never driven or been in a car with the S1X, but I've owned both the XP and VS, and I can definitely say I like the VS more.

The XP felt flat down low, even with 3.29's and 9.4:1 compression. The VS, on the other hand, hits hard the second the pedal goes down and barely gives up anything on the top end, at least according to my butt dyno.

The XP is probably the faster cam on a highway pull, but I don't street race, so I don't care.:th_nanana: Cruising around town and for quick WOT jaunts here and there, the VS feels GREAT. I think an intercooler on top of my current setup and I'll be all set, unless I come across a big pile of money and suddently find an intercooled 10:1 L67 with a Gen V, XPZ, and aluminum heads under my hood.:th_laugh-lol3:
 
dang this just keeps geting more and more confusing...i want a cam for the street. good drivability but makes good power. good low end power and i dont have to rev the motor to high to acomplish this. i would like it to work well with the supercharger, meaning, good low end and mid range power and i dont really care about top end power....with this said. any recomendations??
 
Ill recomend the xp, good on stock heads,more low end power than stock for sure,keeps pulling to 6400 rpm's and doesent fall off at 5000 like stock. just a cupple points i thought i would mention. All most all the other cams have higher shift points, xpz i belive has 6700 shift points. So i think this is a good medium level cam.


I can only recomend what i've used and what i know works and how it works. I myself am happy with the xp. AGAIN-UN-TUNED there is a big difference between stock and the xp.



p.s. if you have a tuner you can make anything streetable.
 
well yea. the xp seems more like a top end cam tho. i mean i dont know but just how everybody says it seems more like top end. im trying to find something more geared to mid range...lets just say i like my torque and i want more of it. plus im not all that crazy about raising shift points to 6400. thats almost 1000 rpms higher then what it is now 5600. im sure its not all that bad but again im trying to stay away from the high reving if i can..
 


Ok i got ya. :th_thumb-up: seems like the only cams that dont go that high in the rpm range are the vs and what else fellas? so that will narrow it down for sure. probably to around 2 or 3. im not sure the ''sugested shift points'' for the s1x or prj but im sure there no higher.
 
not that i wouldent im just trying to avoid it if i can. but if i cant figure this out im going with that cam. mine as well go with one that i know make the most hp with stock heads :)
 
I believe I was told to take full advantage of any of the cams the shift points need to be raised the PRJ cam lift isn't as big as XP in my sig is a link to the exhaust clip of the idle Paul talks bout how the cam is Very valvetrain friendly and was designed for stock heads
 


blowfishRus6 said:
hummm well then...i just dont know. more reserch in store. witch cam makes the best torque on stock heads??
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Not sure. My guess would be the S1X. Raising the shift points, with the VS, XP, S1X on stock heads beyond 6200 is not required nor helpful IMO. Look at the dyno's and see what is happening to the power.

I should clarify what I mean by loss of lowend power. This only affects low rpm low throttle postion versus stock. Anything above ~2200 rpm is great. Comparing equivalent throttle movement. To make a quick traffic manuever now, I have to give it more throttle, which either causes the TC to unlock, or a downshift. When either or both of these things happen, you can tell the car is cammed.;) If you give the throttle enough % from any rpm or mph, you know the car is cammed.

btw, my car shifts right at 6K (recommended by the tuner) at WOT and chirps the tires when shifting into second.
 
chirping tires in second would be bad :) and okay i kinda see what your saying now. its like its a bigger cam so it takes a little more to get going but once it gets going, its going :) and yea the S1X is seeming like the better option for max torque.
 
IndeedSS said:
Not sure. My guess would be the S1X. Raising the shift points, with the VS, XP, S1X on stock heads beyond 6200 is not required nor helpful IMO. Look at the dyno's and see what is happening to the power.

I should clarify what I mean by loss of lowend power. This only affects low rpm low throttle postion versus stock. Anything above ~2200 rpm is great. Comparing equivalent throttle movement. To make a quick traffic manuever now, I have to give it more throttle, which either causes the TC to unlock, or a downshift. When either or both of these things happen, you can tell the car is cammed.;) If you give the throttle enough % from any rpm or mph, you know the car is cammed.

btw, my car shifts right at 6K (recommended by the tuner) at WOT and chirps the tires when shifting into second.
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indeed do you have the xp?
 


Um....since when does anyone drive around town under 2000 rpm. Unless my gauges are off, that's where I cruise at, and I have NO problems with power all through the RPM range.

I like my XP, and I'll probably continue to use it in my next engine(s)
 
I think my stock converters stall is around 3000 on my gtp taking into consideration my mods.Wich would probably put my crusing around 2000 to 2500 maybe since he has a impalla his converter stalls lower...i dunno.
 
damn i wish i had a dyno so i could tell you for sure. It has more torque than stock. that i can tell.I think the xp is better at torque in the low end than stock but also improves the upper rpm range vs stock.
 
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