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Best upgrades for a D15z6 N/A

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31K views 15 replies 4 participants last post by  AdrianEJProject  
A
#1 ·
I have been looking around this site, and D-series.org, and i was just going to ask what do you think is the best small/Med upgrades for my EK3 D15z6 vtec-E
a List of mods that iv seen on alot of d15z6's on D-series.org:

D16y8 IM
D16y8 cam
D16y8 "bridge"
B16a2 TB
OBD2 240cc injectors
CAI
Supersprint catback
Supersprint decat
Supersprint header 4-2-1
camgear
TCC flywheel
D16z6 clutch
Password:JDM heatshield
Zeitronix wbO2
S8G gearbox
P28 ecu, Cromed on the dyno.

What i am wanting to know is 1. whats the CAI? 2. Whats a D16y8 "bridge"?

And btw the EK3 using them upgrades made 150,5hp @ 7100rpm and 167 Nm @ 4300rpm

Thanks
Adrian.
 
X
#4 ·
Well I'm wondering why you would need the bridge, not to clued up on the D's, but it may be because the journals for the cams are slightly different size, so getting the bridge would mean you would only need to get the journals resized on the head. Would be worth it to investigate that as it will be an additional cost at the machine shop.
 
X
#6 ·
well I may be wrong it my be just a cam lob clearance issue or something, hopefully someone in the know of D's will clarify this, but yeh general rule full head swap would be easier. But I do know some heads to blocks have slightly different water and oil feed placements which can also be solved with a bit of machine work so the journal resizing may be the lesser of 2 evils. Personally I don't know the differences in the 2 heads for these d's to provide a definitive answer but didn't want you to buy it all and for it to not bolt in so just thought I would give a heads up of why that might be.
 
X
#7 ·
hmm, yeh from the little research I have done the d-series bridge comes with everything on it including tapets etc. So It looks like because the vtec in the d15z6 is a 12 valve to 16 valve change over, where as the d16y8 is 16 valve all the time with a lob change the layouts for the bridge will most likely be different. so looks like you need it just for that reason and it just bolts on.

Therefore in the link you have posted when he said cam change he must have included the bridge with it, as the guy asks in the last post.

Edit: so you can ignore all the previous crap haha
 
A
#8 ·
thanks Xaser. Iv seen many people using the Y8 heads.... and some using the d16z6 heads. but supposedly the d16Z6 head lowers the compression on the D15z6 thats why people use the Y8.... also just read the whole of the D-series.org on Y8 cam swap and yes i can use the Y8 cam without a regrind.


"right, been reading over the spec list for the ek3 running 150.5bhp, now looking at this, does he retain the standard d15z6 head and simply use a d16y8 cam and cam gear as a straight swap? if so does this create full vtec rather than vtec-e?"

"Sorry to bring this back up but, yes, he's using the stock d15z6 head. and swapped over the d16y8 cam, cam gear, rockers.
This does eliminate the "E" in vtec-e!"

but to use this on my EK3 i will need a P28 and a chrome tune... obd2 to obd1 as he says anyway...

"D-series.org : 3 questions being a fellow d15z6 owner and lover from the uk.

for the obd1 conversion i just want to make sure all i need is the p28 ecu? which engine does that come standard with btw. the only other thing i should need is a wiring harness converter to go from my obd2 to obd1 because i dont fancy splicing wires it does my head in"
 
C
#9 ·
the d16y8 head has higher compression but the d16z6 is better flowing
i think it should make it propeer vtec due to different cam lobes ecu will need mapping for it to work properly
p28 obd1 ecu is from eg civic esi and yes u need a conversion harness
why not use d16y8 head and cam with low comp head gasket should see over 140bhp at flywheel easy with the rest of mods listed
 
X
#10 ·
Yeah from the research I did no regrind is needed, and it seems that the cam's and bridge just bolt in, which as you say will keep you standard CR and save you having to take your head off to do this mod so sounds like a really nice little mod.

And yes it will remove the 'E', as a vtec-e goes from running only 12 valves and when the vtec is enabled it runs on 16 valves and is purely done for fuel economy. So it would seem when you put the y8 bridge on, it is setup up to enable the additional lobs, where as on the 'E' it just enable the one floating tappet on each cylinder to enable all 16 valves.

You will need to get the p28 chipped for it to be programmed with crome, you can do it yourself but if you find a tuner that does crome I'm sure he will be able to chip it for you.
and the p28 ecu comes out of the esi over here.

And yes all you need to fit the ecu is an obd2a - obd1 conversion harness.

Edit: beat to it :D
 
S
#11 ·
ok.
both the y8 and the d15z6 run on obd2 fuel control you only need a conversion if you change to the older d16z6 head
the d15z6 runs a 9:6:1 CR the same as the y8 incidently.
the d16z6 runs a 9:2:1 CR as i remeber. so you Will need to skim the head to suit to the d15 bottom end
the p28 ecu runs on the d16z6 engine obd1.
if you use the y8 you ill not need an obd1-obd2 conversion harness it uses a p2p obd2 ecu
the d16z6 will require a conversion harness and a 0.2mm-0.25mm skimm to suit CR.
 
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