The ZZP XPZ camshaft marks a new era in 3800 supercharged performance. Unlike any other camshaft currently on the market the XPZ boasts technological advancements never before available to the public. Dubbed the "XPZ" because we started with some of Chris White's XP cam idea and tweaked it from there.
Working with Comp cams we wanted to get into some of the race team technology that enables engines limited by displacement or restrictor plates to make massive horsepower. We believe that these types of teams deal with exactly our types of issues. We are limited by only having 3.8 liters. We are also limited by the M90. These 2 factors are why every single high HP M90'd grand prix on the message boards is within 20 WHP. Even more interesting to note is that the 2nd, 3rd, and 4th place M90 dyno's on club GP are within 3WHP of each other even though they run different mods. It's very clear that current technology was tapped out. Somewhere around 350 WHP was the absolute most you could expect to get out of your Grand Prix without switching power adders.
With the release of our XPZ cam, ZZPerformance is going to impact the Grand Prix performance market in a very positive way. Our M90 powered GTP put down 410WHP with this cam, which is over 500 HP at the crank! At the time of this cam being released our M90 powered Grand Prix dynos roughly 60WHP more than any other GP using the M90 as its power adder. This is without taking off the accessory belt, leaving the alternator connected like factory, and making the pulls on our 18" every day rim/tire combo. All in all we made about 8 dyno pulls improving HP slightly with each pull until we were satisfied that we had tuned the car in.
Other mods include Stage 3 blower, Gen 2 intercooler, 2.55" ZZP Gen 2 MPS, Comp pushrods, modified INTENSE S3 heads and a stock bottom end (with the exception of timing chain modification).
What you will notice about our dyno chart beyond the insane peak HP number is the power curve. The power did not fall off all the way to the 7k rev limiter. Simply stated, the ZZP XPZ cam produces more torque, peak HP, and more average power than any cam currently available for the 3800 engine. No other cam profile even comes close. If you're serious about performance there is no other option for achieving this level of performance.
Modified heads are required with 130 or 150 pound springs. Peak lift of this cam with 1.6 ratio (stock) rockers approaches .570 on intake and .540 on exhaust. Stage 4 ZZP heads allow the use of Comp 1.7 rockers. The lobes are uniquely shaped and therefore custom length pushrods are required with a different length on the intake than the exhaust. The price above includes 12 ZZP 3/8" pushrods, 6 at one length for intake and 6 at another for exhaust. The standard kit is designed for people with stock thickness head gaskets, stock block height and heads milled less than .010, please contact us if you have a custom setup so that we can ship you the appropriate pushrods.
Intake and exhaust durations are purposely omitted. This is not to hide some secret duration numbers. It is because the duration numbers on most cams are listed at .050 lift and due to the highly unique nature of the lobes on this cam profile the numbers would not be comparable to other cams on the market. The cam spec card does not list Comp cams lobe numbers because they are highly custom. Please be aware of this before making your purchase.
Idle quality of this cam is a little rougher than the XP cam but milder than the INTENSE S3 or Thrasher. Gas mileage will be comparable to idle relative to the other cams. Custom PCM programming recommended for P0300 code, raised idle, added timing and raised shift points. 3.0" pulley with no intercooler or 2.6" with intercooler for daily driving. 14 inches of vacuum at idle, peak boost should be high 13's with 2.6" pulley and intercooled. Stock or 2750 stall converter recommended. Stock, 3.29 or 3.69 gears will all be fine due to the extremely broad power band.
Required supporting mods for this cam would be:
Rollmaster double timing chain, Comp OE-R lifters, Intake - 150# valve springs, Exhaust - 130# valve springs, & modified retainers.
http://www.clubgp.com/newforum/tm.asp?m=1550443
video of car idling with XPZ cam
http://okixtreme.com/xpz_cams.html
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