Thread: looking into xp cam, have a few questions

Originally Posted by BillBoost37

That XP vid says 600 RPM, a stock cam could sound lopey at 600rpm idle. A lot has to do with the rpm. If you bring it up 100rpm, things smooth out.

I use 1/4" NPT brass plugs with recessed heads with a little pipe sealant on them. Same goop as you should use for LIM bolts.

If you want to go further you open up the end cap on the LIM that is under the TB and realize why we have poor flow from rear head to front. Then you open that up a bit. By doing this additional step, I kept #4 from running hotter than the other cylinders. Typically the middles run hotter and #4 being in the back, runs the hottest of all.

hmm very interesting, thanks for that info..I'm guessing I can get those brass plugs at home depot?..and I know the rpm plays a big roll, he has a 900 rpm idle vid to with the xp.

900 rpm xp

YouTube - GTP, XP cam idle vid, 900RPM.

Still think the s1x sounds better and has more lope?

Here is the ultimate question I'd like to get some feed back on...which cam should I buy over the other and why?.. id like to be in the 12s and have good topend with out having to rev past 6400 and use the same valvetrain components listed previously..

GenV...that's quite a big step if you were both on 3.4"s...your comparing apples to oranges guy. A 3.4" on a GenV...is like a 3.2" on your car.

Originally Posted by bluegtp91

GenV...that's quite a big step if you were both on 3.4"s...your comparing apples to oranges guy. A 3.4" on a GenV...is like a 3.2" on your car.

Believe me I know that's why I posted saying he has the advantage, I may be new on here but by no means am I new to the l67/l32... I'm just looking for a little edge to try and even out my gen 3 to his gen v lol....before the cam went in his car and even before I had rockers we would be pretty much dead even....I have a bunch of Vids if interested, and both cars where running kr free...I'm just so impressed with his vs cam, I could only imagine a xp or s1x!.

XP vs S1X, you will find they are nearly the same. One creates a smidge and I mean barely a difference at the low end and the other is a smidge better at the top end. You'd never really notice it in a race though.

On the idling.. Yeah, I'm positive. I've installed at least 3-4 of each and owned an S1X for 4+ years.

Originally Posted by 04boostedindyss

Believe me I know that's why I posted saying he has the advantage, I may be new on here but by no means am I new to the l67/l32... I'm just looking for a little edge to try and even out my gen 3 to his gen v lol....before the cam went in his car and even before I had rockers we would be pretty much dead even....I have a bunch of Vids if interested, and both cars where running kr free...I'm just so impressed with his vs cam, I could only imagine a xp or s1x!.

Id like to see the vids. And im glad this thread was made because i will be going with the xp cam sometime this summer and getting rid of my rockers.

Hhmm so I should go s1x over xp ?...and if so still use the same parts as listed earlier?

Originally Posted by SnowFlake

You can't go wrong with either, I have an XP and I love it. The reason I chose it over the S1x is because I got the best deal on it.

There ya go.

The XP utilizes a little more top end which these cars lack...which is why I went with it over the S1X.

Awesome, guess I made up my mind...anyone know if I can get a discount on one LOL..

I'm ordering a Racetronix fuel pump rewire tonight as well as a new fuel filter then ill have all my parts needed for e85...should I just go e85 before the cam or wait till after?

going for a pump or just a rewire?

Might want to think about a treperformance.com high flow pump. I've been using a couple for years. If you are aiming for save a buck.

Just a rewire for now ..but maybe a pump eventually. Injectors and rewire new fuel filter and tune should be good for a basic e85 once I have a 2.6 pully and intercooler it will be time for the new pump

Hey now bill is awesome for providing good info and going through all the trouble, but you may be right

Awesome. I'll post Vids later once I get home and can use my laptop

I liked my XP...but it wasn't big enough...so I went stupid

YouTube - XP Cam Start-Up

Well I won't be doing any head work for a while, and xp seems to be the best for stock heads....what did you go with xpz?

The Thrasher Engineered Performance Race Cam...it's pretty beefy.

YouTube - Big Cam GTP Idle & Rev

after being in and around, now, three cars with the TEP (including my own) it isn't big enough. i'd need something bigger if i did it again.

my car idles at 900 and its still loopy. In drive with the brake petal depressed you wont notice it too much but when in neutral or park, it sounds a little wild. 4,500-6,000 and up is where this cam really shines. I went with xp after i went for a ride in an xp car, got rid of the rockers and didn't look back.

If you want 6400 rpm shift points, your going to need 1.6 rollers

Chris.. you know how little time I have. I'm only trying to help out. There's a lot of guys that don't realize parts are much cheaper when you aren't paying the overhead and shipping from a 3800 vendor. Can't fault those guys for making money, but heck..the pricing differences on some stuff is ridiculous.