Thread: XP or S1X

There was a recent incident in which I most likely blew my #3 piston ClubGP Message Forum troubleshooting . So i have decided that the new block will either get an XP or an S1X. I am looking for feedback and dyno #'s/ track times from those of you with first hand experience. Thanks in Advance

The S1X is a favorite of everyone i know, but no one I know has had both.

PRJ LL cam in my opinion is better than both its a smaller cam valvetrain friendly and will put out good numbers on stock heads a local guy has a riv same mods as me and hit 349 whp with that cam and PRJ said there was still more to be had
exhaust clip in sig

if i were to choose between those two, i would pick an xp. its a proven cam, but then again the s1x is too. but if i were to choose a cam out of everything, i wouldnt have stock heads..

Originally Posted by black.gtp

PRJ LL cam in my opinion is better than both its a smaller cam valvetrain friendly and will put out good numbers on stock heads a local guy has a riv same mods as me and hit 349 whp with that cam and PRJ said there was still more to be had
exhaust clip in sig

What are the specs on the LL cam? where did you order it from? and how much was it?

not sure if the s1x can be used with stock heads but I have the xp and by just swapping the cam from a stock to an xp i can notice a big difference between the 2. Even with no tuning done yet i can tell a majior difference

The S1X is actually smaller than the XP...

You can get the PRJ LL cam from Welcome to PRJ.Performance contact Paul for specs

Originally Posted by TDCRacing

the xp cam has proven to be the most powerfull on stock heads. Checkout the link to some dyno results.

Paul is working on changing that

I need to do a few more things to my car before he can really tune it I have tie rods bad and need tires and alignment then the tuning with start then we will hit the Dyno for some numbers

With a 3.0 pulley at the track full weight 3/4 tank of gas I was running 13.1@109.5 all night with 2.1+ 60' The tune is close to stock tune maybe 14 degrees of timing I know its not the the greatest but I need slicks to get it to hook

yes it was like I stated its not tuned in yet and full weight and bald street tires My MPH ranged from 109.52 - 109.94 through 7 passes e.t. from 13.5 - 13.1 more 13.1 - 13.2 and 60' 2.1+ 13.5 was first pass after driving 30min to track

Originally Posted by TDCRacing

cool im anxious to see what mine will do from 13.5 with the addition of a cam and 3.2 to a 2.8 and a tep tranny along with a bad ass tune.

Good luck looking at 1/4 mile times here and clubgp my MPH is close to mid 12's if I can get traction

Originally Posted by TDCRacing

Traction? what exactly is that? and yea i thought those were awfull high traps

my first pass after the build I ran a 14.88@ 107 60' 2.8 lol fastest MPH 14.88 I have seen

I've had both. The S1X idled rougher and better low to mid range power than the XP IMO. If I had to do it over now that I've had both, the S1X would be my choice.

thats the thing that sucks about the big cams that these vendors make. without raised shift points you really dont get as much as you can out of any of them. i mean, look at the xpz. it makes hella power way into the 6k range. no one shifts that high except for the people who run big valve springs or people that want to have no valvetrain left after a good run.

i wish someone made a cam that PEAKED power at like 5200. i want some low end man, i dont take my car to the track..ever.

with stiffer valve springs and all could an engine with stand a 6500 redline??