wdwalker

www.sohcturbo.com, check out zerodaze's setup. 230whp on a b7/y8 combo. weight is not a big deal at all, its such a low amount it doesn't even really matter. my problem is with tuning the crossover and matching both maps. and for my setup, the 14b is gonna be fully spooled by 3500rpm, vtec kicking in at 4800 doesn't do ---- to spool it. u'd have to have like a t4 or bigger or be running a shitload of boost before vtec is actually helping spool the turbo. lots of turbo people change the vtec crossover down to 4200 because it makes a smoother transition, but saying vtec will spool it sounds ridiculous to me.

carolinadsm92

one of the best D-series F/I setup to me is a z6 block with low compression pistons and a y8 head be cause of its great combustion chamber design and it has 4 quench zones instead of 2 like the 96 and under heads

nonvtec

Everyone is talking about sohc vtec like it's nitrous or something. Mad Vtak doesn't come in sohcs.

90turbohatch

My motor will be built and compression would be about 10:1 with a vtec head or 9:1 with an a6 head. So in my case the limiting power will not be the bottom end. I'm looking for a better flowing head or whichever head makes the most power. I know the y8 has the best combustion chamber design but not the best ports. I know vtec isn't gonna ad a ton of horsepower and I'm not gonna do a mini-me just so I can say I have VTEC. I don't give a ---- if I have VTEC or not. I just want the best head combo for boost. Do any of you guys have opinions on an intake mani choice for boost, y8,z6,a6. I know that y8 has the biggest plenum with the most volume but I don't know if it will make the most power.

imadouche

Use the y8 intake mainfold, leave the a6 head on and turn up the boost.

carolinadsm92

i would rather have the z6 intake manifold over the y8 yes the y8 has the bigger pendulem but with F/I its about air volicity and how much you can sqeeze into the combution chamber the z6 has the strighter runners and i would seriously go with the y8 head you will get a more complete buning and will reduce the likleyhood of dentonation by increasing the turblance of the air/fuel mixture as the piston comes to TDC,it squishes the a/f mixture towards the sparkplug and away from the end zones of the combustion chamber.......your best be is going to be going with the y8 yea its going to raise the compression but over all it's the better head and go with the z6 intake manifold its going to give you 4% more volicity over the y8 or y7

90turbohatch

I heard there was something about the ports in the y8 head that wasn't good. Do you know anything about this? I agree on the combustion chamber. And is the z6 intake mani bigger than the a6? Any pics?

BoosTedZSix

the z6 head flows better than the y8 head, but the y8 mani is better than the z6 manifold. the y8 intake manifold is like an ITR manifold for d-series motors. even though a sohc vtack doesnt make power. look at it this way a non vtec d16 stock has what 106 hp? and the z6 has 125. somewhere within that area there. im sure you'll see some gains from a y8 compared to its nonvtec counterpart. you dont see the high hp d series with no vtec. vtec is always gonna be better than non vtack

carolinadsm92

dude if you read anything its always going to tell you that the y8 head it better because of its combustion chamber try read somemore before you go giving bad advice

BoosTedZSix

are you talking to me? the combustion chamber. the only thing the y8 head will do is bump up the compression more. read read read go compare a y8 and a z6 head and tell me what you find out