93 Eg Couper

I have a D16Y7 w/ Vitara/Eagles bottom end and a stock D16Z6 head.
RC750's
S300
Turbonetics T3Super60
etc..

I was running 14psi and only 12* of timing last season, put 5,000kms on it.
I daily it on 91 octane.
I estimate it made around 150-160whp with mustang dyno factors.
I pulled out a 14.7 @ 101 mph with an AWFUL launch.

I wanted to make around 250whp next summer and am guessing 16-18psi with 18-20* of timing. Keep in mind the head has 340,000km's on it but the valve guides were good and the head is surprisingly strong.

91 Octane is my only option.
Is it worth it to build my D16Z6 head(valves,springs, retainers) AND cam it?
Which cam would be ideal for me to use?
Building a D-series head is not that expensive and possibly quite worth it?
I know I can make 250whp on a stock head but if I can build it for cheap and make maybe 260-270whp? Or even 250whp but being a lot more reliable with the build head..

silverwrench

why not just get a bigger turbo?

K7-1Ktrevor

why is your power so low? Id expect at least 200whp on 14lbs.

93 Eg Couper

What would be my benefit to that?
The T3Super60 is already big enough and has some lag to it. I'm making about 9psi till 4800rpm then 14psi till 7200rpm.

93 Eg Couper

It is an estimate. I ran 14.7 @ 101mph which I think with a proper launch would give me 14.0 @101.

I am only running 12 degrees of timing at vtec as well...

ken9

D16z6 are good and strong motor. I have the same motor as yours. You can make that kind of power on budget. Just look around and alots of peoples have boosted.

d-series.org..

K7-1Ktrevor

when I had a ebay turbo on my z6 at 14.7lbs I trapped 108 in a 2400lb coupe with me in it. I don't know what my ignition timing was because back then I didn't tune my own cars. your mph seems really low though and I don't think 12 degrees is super low from how low my mini me has to have the timing set or I run into detonation issues. Im at 14.5 degrees on 6lbs and it doesn't want any more then that

93 Eg Couper

Your probably running stock internals...
My buddy blew up a D16Y8 with eagles/wiseco's and a gt28 at 22* timing

K7-1Ktrevor

ya I am and its somewhat high comp so I guess that is pretty low timing. still the mph seems really low to me. who tuned your setup?

93 Eg Couper

I need more help guys...What your telling me is mostly irrelevant

plane92

The actual ignition timing may undergo corrections by the engine software (i.e. temperature corrections), and the corrections may differ depending on the engine management used. What this means is that it is not always safe to say "15 degrees is 15 degrees is 15 degrees."

With that in mind, it sounds like you have the right idea. Make small changes, either bumping the timing or increasing boost pressure. If you aren't having the car tuned at a shop, you might want to look into detonation cans and tune it at the track.

https://honda-tech.com/forums/forced-induction-16/det-cans-1555006/

blackeg

ok, first of all 18-20 degrees total timing is entirely too much for 91 octane and over 1 bar boost.


the static compression on the vitara/eagle block is in the 7's, so you can run a little more timing but still in all lets not go crazy. i hope you did arp headstuds too.

101 mph is more than 160whp. my 2400 lb hatch with a vitara setup and similarly sized turbo used to go 13.8s at 104-105 with bad launches 2.1 60 ft. that setup made 190/166 on 9 psi, and kept wanting more timing. it was up to 21ish degrees at 8 psi with no visible signs of det on the plugs, but i pulled it back a little bit as i wanted it to be able to take a beating because i was selling it. later or it was run at the track around 15psi which would have been somewhere in the 240-260whp range.

that setup ran on 11 degrees timing on 14 psi, and about 6 at 18 psi. plugs looked good at that level.


you have to understand the only real way to do it best is to dyno or track tune the car.





now the answer to your question, as long as the valve seals arent leaking and the hg isnt blown or lifting, leave the head alone internally. if you want more power you can focus your finances on an aftermarket intake manifold and/or a slightly larger turbo. additionally, from the sounds of your post your vtec engages at around 4800 because thats when you are able to get the flow to run the turbo up to the boost settings. mess around with that setting, its possible lowering it to around 4400 will get you spooled up more quickly. good luck. i miss my vitara/eagle setup it ran its *** off for over 10k miles for the money i had into it.