ryden305

what i meant was the head package, think that alone with give significant gains with out the rest of the exhauset. think that is worth it.

jmiller20874

If you're talking about a ported & polished head with oversized valves, hell yes it's worth it. Alot of power can be made here if done properly and for the right application(NA or FI).

effin_sciontc

I think he's talking about the ZPI stage 1 head that goes for about $550 i was woundering the same thing but i want to see a dyno first so i could see if its worth buying. And i would also like to know if its ok to have the stage one head and run the turbo because they didnt do it to there project car so it might not be a good idea. If you guys at ZPI read this can you let me know if its ok to get the head and a turbo. Thank you

Thrawn

I'm guessing that you're talking about the ZPI stage 1 head package. They haven’t released a dyno yet, they've only posted their claimed gains. I really want to see a (well done) dyno in order to see how their modifications to the head affect the power curve. Until then, I couldn’t really say if it will be worth it or not, and it really depends on what your goals are. For example, if all you're looking for more mid-range power, and the head package focuses on top end power at the sacrifice of mid range, then it may not be worth it to you. But we won’t know until we see some dynos.

ryden305

well im trying to get some more power with out exhaust. just dont want the honda sound. not sure about forced induction yet, and also about reliability. think it will ____ with any thing. is it high risk?

tckurt

not cracking on ZPI but all it is a port and polish... just get a local shop to do it and not worry about shipping they dont make a new cylinder head just bore it some to let more airflow in... and Hell yea its worth it... and go ahead and port and polish the intake manifold as well.

jmiller20874

The intake manifold is plastic, good luck polishing it.

toastbox

Regardiing the port/polish head....wouldn't that require a custom header setup???

SLOWboostinXB

what is the web site to this company?
i would like to take a look at what they have

toastbox

www.zpiracing.net
or
www.zeropointindustries.net

one is on his SL profile, the other is in his signature. Not sure which one works....I cant get to either of them from work, since traffic is restricted here, lol

SLOWboostinXB

thanks for the help

toastbox

No problemo.

Repeating my question, with a little more explanation....

Regardiing the port/polish head....wouldn't that require a custom header setup??? Aren't you basically enlarging the exhaust ports, and thusly, a header/manifold with larger ports would be required to mate with the head?

beuller? beuller?

retrodrive

lol, classic

steve_r

honda sound? thats probably the first company that came to mind when you thought of "rice". I think you mean the "ricey" sound. What the hell is burning around here? o nvm its just rice.

hahaitzskippy

is sound everything to most of you guys on this forum?

The_Instigator

No. header ports will be in the same place. If it turned out that your port were larger than the primaries, a header with larger primaries would be ideal. If it was only slightly larger, you could port the header flange to match the exhaust ports.

toastbox

Isn't that what porting the head does though, enlarges the ports on the head, thus requiring a header with larger primaries??? Or does it depend on the stage head you have, that determines the amount of porting, and thus the need for a custom flange/larger primaries on the header?

The_Instigator

Ususally the exhaust port size isnt changed enough, butit all depends on the port job.

RacingSolution

It would be smart to do a port match so the ports on the head and the header/intake are the same size. This would allow optimal air flow.

On my old car, turbo'd corolla, I port & polished my intake manifold.. I had the intake manifold port matched to my overbored throttle body... Different scenario, but same concept.

toastbox

Thanks Instigator and RS. Info in *much* appreciated!