samson

Yes. I searched and really couldn't find what I was looking for. A friend boosted his car and he has told me there is more compression in y8 then y7. Is this true and how much? Is it caused by VTEC? Also, he said you could run a thicker gasket to lower compression. Has anyone done this? He then began to tell me how his boosted y7 head ran better then y8 head (lost to SRT-4 with y8 then won with a y7 head). I was curious if anyone has ever heard of this or knows anything about it. Thanks.


JP

d16tuner

Unless you are getting them both at the same price, I'd just get a y7 since you are going FI anyway. The vtec isn't going to make a big enough difference to you for the average price difference you are likely to pay. Just my opinion.

samson

It's just a stock engine in a 98 coupe ex. So hence the d16y8 (VTEC head). Thanks guys.


JP

Blahblahblah

That's what I was going to lurk on next. If VTEC makes much more of a difference when turbo'ing. I have a d16a6 and I plan on a mini me turbo, but sometimes I wonder if it would be more pain than pleasure.

wdwalker

yeah, now u gotta tune 2 maps instead of just one... added weight in the valvetrain... but it'd be pretty sweet to get a big turbo and have vtec spool it lol... u got nitrous to get her spinnin and vtec to spool her up

90turbohatch

I'm also looking for opinions on this. Straight a6 turbo or mini me turbo? Wondering the benefits or hp gains of going with either the z6 or y8 heads. Also looking for opinions on intake manifold choices. a6,y8,z6 for boost? How about stock vtec head vs. a6 head with a turbo cam. Which would be best for boost? Anybody got any experience?

wdwalker

i'd say the biggest benefit of running the mini-me setup is that you can get a lot higher compression from the combo. that'll gain u a lot more torque, but the downside to that is shortened engine life and being more prone to problems like detonation and lifting head gaskets. i'd never run more than 11:1 compression on a f/i street car. call me a ----- but that's about as much as i'd ever wanna risk running (unless of course you can get it on a dyno and tune it RELIABLY to run that much compression. make sure to retard that ignition timing though)

nonvtec

For a stock motor with a stock bottom end, don't raise the compression with a vtec head. The limiting power will not be your stock nonvtec head it will be your stock bottom end. Don't waste money on the mini-me. Blahblahblah, you're complaining about extra weight and tuning two maps? You're kidding right because that's just stupid. And sohc vtec is going to spool up a turbo like 100 RPM faster than a nonvtec head, nonvtec owns bitches.

d16tuner

If the turbo is properly sized, it should already be spooled before vtec comes on. If you need vtec to help spool your turbo in anything other than 1st gear, your turbo is too big, or you only use it to drag race. Even if the turbo hasn't finished spooling before vtec engages, it should be most of the way there, and I doubt whether vtec is really going to make that much difference with the remaining 2psi.