xXx Justin xXx

running a y7 and greddy kit with y8 IM. going to get hondata and tune on 10psi. if i get the y8 head and y8 HG... tune a p28 w/hondata @10psi... would the gain be worth the $ it would cost for the head/ecu (actually two ecu's, one for hondata, one for passing inspection) the different timing belt.. blah

anybody know how much power gain this actually is. or how much better the y8 head flows over the y7... dyno #'s?

xXx Justin xXx

anybody?

fsp31

I'm running the y8 head on a y7 block and I can definitely tell a difference. Since SOHC heads are so easy to swap (no messing around with cams), I'd say go for it if you have one sourced for cheap. Wiring the vtec solenoid takes about as long as the head swap...

I've got vtec set at 5200 rpm's. Even though I'm running a little turbo (t25), I can definitely feel the extra surge. It's much more significant than when the car was NA. IMO, that's due to the design of the y7/y8 heads. Their design is why the 6G Civics got ULEV status. One of the intake ports is angled to increase swirl in combustion chamber. It hurts flow a little bit. So, I think the head itself becomes a weak link sooner than a z6 head would for that reason, although we're talking about a tiny difference. And if the motor were still NA, the y8 head might be better than the z6 for various reasons.

All that to say... I think the head is essentially the limiting factor on my setup, and that's why the power increase under boost is significant when vtec hits.

xXx Justin xXx

well i dont have one sourced for cheap. i would have to buy a y8 head. a y8 ecu (for obd-II inspections testing)... a p28 to run my hondata in... then do the swap. i know how to wire it all up. had a z6 swap in my old eh2... and then a mini-me in the old cx.

i was justing thinking for the $ ill spend getting everything i need do to the head swap... would i be better off using that same money for a nice turbo cam and an ignition setup....... or maybe just some headwork on the y7...

im already running the y8 intake manifold.

Luiyo

Go for the non-Vtec head it works better for turbos.That is what my friends are doing back in PR and everybody tells me that can get more power like that.

xXx Justin xXx

should i get a nice turbo came, or maybe a P+P with the $ im saving by not doing to vtec head? i would like to hit like 210-220 on this at like 10-11psi with hondata. i know its not very far fetched.. i had 200 on my old z6 @ 10psi with a dsm smic.

infinatenexus

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Luiyo &raquo;</TD></TR><TR><TD CLASS="quote"> Go for the non-Vtec head it works better for turbos.That is what my friends are doing back in PR and everybody tells me that can get more power like that.</TD></TR></TABLE>

Ummm ok... the intake and exhaust ports are the same.. and the Y8 has a more efficient combustion chamber design. The Y8 would also have a higher lift cam leading to more power. If you really want to get sick with it you could always drop in a comp 59300 cam and get a nice bump in power.. before and after the turbo.

TravSi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC b00st &raquo;</TD></TR><TR><TD CLASS="quote">should i get a nice turbo came, or maybe a P+P with the $ im saving by not doing to vtec head? i would like to hit like 210-220 on this at like 10-11psi with hondata. i know its not very far fetched.. i had 200 on my old z6 @ 10psi with a dsm smic.</TD></TR></TABLE>

You can do that too...either way im sure your goals will be met

xXx Justin xXx

well... i mean i can do the y8 head. not that bi of a deal. i just figured i could get some headwork done with the same money instead of buying the y8 head. then just adding a nice cam. it is already boosted by the way..

just tring to decide the better (more HP for the $) route to go on this one...

infinatenexus

IMHO go with the VTEC head.. it will let you run a higher duration cam with out hurting your driveability

xXx Justin xXx

ok, so if i run the y8 head and y8 HG on the y8 block....with a p28 w/hondata ... what kind of "nice power bump" are we thinking on the topic of this cam?

infinatenexus

I think N/A is like 10 hp.... F/I cars have seen something like 20-30 Hp. since its a regrind the over lap is the same... only the lift is really changed

xXx Justin xXx

and this is whp with a cam being the only mod as far as head work goes (on vtec head obviously). if thats the case... that 220 mark i really want would be crazy easy... i know seen a y8 on 9psi tuned with a greddy kit made 209whp and like 176wtrq.... not sure what he tuned with though. stock engine.

fsp31

Those numbers sound right. I'm at 185 whp @ 7 psi (it's an autox car.. i'm not interested in huge hp). Seems like the only issue with a cam in the Y7 would be a possible loss in the low/mid range until the motor gets "on the cam". For my application, that's definitely not desirable.

BTW, I bought my y8 head and a 99 ex ecu for ~ $200. I would guess that's competitive with the price for a new cam, but I don't know. All things being equal, I'd prefer vtec. Do a little headwork a few months down the road and the vtec head will definitely be a good decision. One thing a lot of folks don't know is that the vtec lobes on the y8 head are surprisingly aggressive...