a head package for the zx2 that can take a stock zx2 to 165 to 175 whp?

pnp head, high compression radius cylinder, stock valve line except cams. 420 lift intake and 400 lift exhuast cams, it may be the other way around, i don't remember. ported intake manifold and throttle body, headers and tuned ecu.

i'm calling bs on this one, what do you guys think

well if you are up to SR specs, your pushing around 140, a head package adds 20 or so HP depending on how good the work is and how extreme your cams are... i would say those numbers are about right

SR will put down about 110-115 whp depending on the car....not 140

Full bolton, with a full head package with race cams, and very very good tuning will hit 150-180 depending again on car and tuning(very few people can tune the zx2 well.

Stock stock zx2 will pull around 98-108whp depending on car.
^with intake, udp, and a s/r comp you will hit what the s/r hits plus 1 or 2 more whp...

Full bolton with mailorder tune will hit around 125-130whp
dyno tune around 135whp

WHP from dynojet dynos, all proven by friends of mine or myself

Mustang dynos will yield lower numbers(i forget the specific percentage of loss) because they preload the wheels and show a more realistic number

But if the person is good enough at tuning yes 165 could be feesable

a pnp job will be USELESS without larger valves

if you wanting to stay cheap do pnp, larger valves, new seals, locks, keep stock springs , stock retainers, seats. Then go a mild cam (dont go race cam or you'll never have an idle ..and the plastic manifold will not go good with it.

Sct , header, intake, udp , flywheel, clutch , head done up... all with proper tuning should hit you right around 170 whp , anything more is gonna be a fluke anything less is gonna be improper tuning, something wrong.

interesting responses. gude performance says his head package on a stock car has put down at the worsts 160 whp, no tuning nothing. the best he seen was 181 whp with his headers and tuning.

gude has never really impressed anyone i know, i would say those numbers are BS, i cant imagine 160 without some GREAT tuning, and 181... no way.

we are talking about just a head package here. a fully built engine and all bolt ons with tuning would barely be pushing 200 whp... this all being NA, no N2O shot. High compression pistons would have to put out more power than just a head right?

if you don't do the head the high comp pistons won't do anything for your car. you could push 220 whp with high comp pistons and a head with a few bolt ons.

Inis. In most applications doing a good 3 angle valve job is just as good as doing larger valves. Only time larger valves are needed is in very high hp and very high air flow rate apps.

As for a fully built motor pulling down 220 with 'some' bolt ons....highly highly doubtful. JohnP pulled just under 190 with a fully built N/A motor with every bolton and the frim. If you know anything about johnp you know that he is if not the top a close second in tuning and modding the zx2. His 190 N/A build runs better than most zx2s with no mods. HOWEVER I dont remember the comp he is running so if you ran higher I suppose you could make more. Id honestly like to see a 13.5:1 setup done right ;-)

Gudes numbers were not on a stock car at all. And they claimed they were...so yes they are full of shit. Friend has the head package and their header on his zx2 with tuning and pulled down under 150...looks like their worst is not quite as worst as it gets...I dont deal with companies like that

With the time and proper tuning anything is possible tho

Oh also. High comp is usefull without a ported head....It gets you better gas mileage and it will have a better lowend out of the box.

better gas mileage? the only way to run a high comp motor is to put race fuel in it. there are 14-1 pistons and they will pull 220 to the wheels.

focus power makes thier stroker kit with head that can run 220 whp
raceline has n/a kits that can run 250 whp

johnp isn't using a fully built motor unless he is running those stats above.

anything over 12-1 on a zx2 will not work right without a pnp or cnc head on it, no questions asked. it will not make peak power without that extra airflow. with real high compression systems running 12-1 and higer the only way to get real power out of them is to use at least 110 octane with a better flowing head. when you start spending that much on gas you shouldn't be worried about the type of gas mileage you get because the car shouldn't be drivin daily. you build a motor like that you built it for racing not picking up groceries.

JohnP's is fully built...just because he doesnt have ITB setup or because he wants quality parts doesnt mean he isnt fully built. And his car is daily driven and it runs better than most zx2s ever will. He had his goals set and met them.

Good luck with focus power. I have a few friends whos cars still dont run right both turbo and built motors.

Anything over 11.5:1 will cause the need for higher octane. The fact that I was pointing out is that a raised comp ratio(even 10:1 is raised) is better for the car. HP and economy wise, regardless of a p-n-p job.

Not everyone mods their daily driver to be all out race...