SOHC ZC vs DOHC ZC

7885 Views 25 Replies 15 Participants Last post by The_Acid_Beaver, Feb 25, 2014

xotic_crx

Discussion Starter · Jan 9, 2007

I'm looking at swapping one of these into my 90 crx si, just looking for some personal experience as to which one is quicker with a mildly modded setup(i/e/h). I know the sohc is essentially the same motor i have but a whole lot fresher(230K on mine) with a slightly stouter cam, and I've ridden in a crx with this, and it's quicker than mine.
As for the dohc, how strong are they with si ecu and old integ ecu? I can imagine the teg ecu would be stronger. Anyway, mainly, would i be quicker by dropping in the dohc?

1 - 20 of 26 Posts

ichijoe

· #2 · Jan 9, 2007

can't speak for sohc zc.

As for DOHC ECU, the CRX PM6 ECU sucks major ass for it. I used a PM7 Euro ECU which was much better. But what made my car scream was i/h/e and a ebay spoon PM7 chip that I socketed into my stock CRX ECU box. That chip was only 25 bucks.

Check my gallery, i have a video of it accelerating up to 70mph - the zc kicks ass imho.

xotic_crx

Discussion Starter · #3 · Jan 9, 2007

You have any 1/4 mile times or anything in your car? My buddy has the sohc in his car with just a cai and header(stock exhaust) in an 89 si turning 15.9 with a clutch slipping. Btw where'd you get the ecu from?

ryan89crx

· #4 · Jan 10, 2007

i ran a 15.6 with my sohc zc with just an intake and exhaust

DirtyDC4

· #5 · Jan 10, 2007

ryan89crx said:
i ran a 15.6 with my sohc zc with just an intake and exhaust

Nice.

I ran a 15.7 with a 2.4 60' in the daytime and summer (and above-average elevation) here in Phoenix with my SOHC ZC. It had (at the time) a 4-2-1 header, 2 1/4" exhaust, Z6 IM/TB, Si trans (slipping clutch and exhaust leak), tires at 34 psi in a gutted 91' Standard.

tully

· #6 · Feb 23, 2014

Are the sohc exhaust manifolds the same as the dohc ?? Thnanx

Chrisfrom1986

· #7 · Feb 23, 2014

inb4lastpostwas7yearsago.

Reactions: 1

Bryanstheguy2

· #8 · Feb 24, 2014

are you talking sohc vtec zc or non vtec zc?

Bryanstheguy2

· #9 · Feb 24, 2014

old thread ooops

Slo Mini me

· #10 · Feb 24, 2014 (Edited)

Bryanstheguy2 said:
are you talking sohc vtec zc or non vtec zc?

Yea I was wondering about that as well. I believe from what I have been told by a few Gurus on here the D15 SOHC VTEC Cam (Excluding the VTEC-E Cam) has the best stock cam profile out of all the D series cams again that is as far as stock profiles go so question is if this is in fact true does the head flow better.(time for a search engine I think) And again quoting a few gurus on this statement as well..The DOHC ZC exhaust Mani will bolt to the D series engines and flows better than any SOHC D . If done right I think it would b cool to run a camouflaged engine in regards to bolt on's. Keep the appearance of a Stocker Engine. However that's just my 2 cents..Hmmmm or maybe .5 cents worth.lol

Bryanstheguy2

· #11 · Feb 24, 2014

I had a d16 vtec zc and yea the cam pretty agressive. i had a chipped ecu, and i/h/e on it and that puppy had some power

BeerDrinkin

· #12 · Feb 24, 2014

tully said:
Are the sohc exhaust manifolds the same as the dohc ?? Thnanx

They bolt up but the ports don't line up. You have to take a dremel to the manifold to match the ports up, you can gasket match it to make it easier.

Slo Mini me

· #13 · Feb 24, 2014 (Edited)

I couldn't find a thread on specifically For the SOHC D15 vtec vs ZC DOHC for comparison,oppinions. But the cam For what it is (Is pretty good) so I would say the head probably flows pretty good too. And if it dosent you can always have it machined a lil bit. As Beer Drinking Stated. Again this is if this is in Regards to The Vtec SOHC ZC

BeerDrinkin

· #14 · Feb 24, 2014

DOHC ZC head is the best flowing d-series head off the shelf period.

Evanguy

· #15 · Feb 24, 2014 (Edited)

Every engine japan has is a zc,
a Y8 over there is called a obd2 sohc vtec zc, a Z6 from over there is called a obd1 sohc vtec zc, a Y7 is a obd2 sohc nonvtec zc. an a6 over there is called a obd0 sohc nonvtec zc.

Also the d15b cam is a bit more agressive then a z6 cam and still sucks if your building for power, if you plan on dd you car and not reallt track use i could see using the stock cam, but unless i was in a race class that needed oem parts i would never bother switching out cams for a d15b cam

Also a jdm d15b head is a z6 head. They flow the same. And the cam would do better in a 1.5 bottom end because the ratio of cam size to cc displacment changes. So putting that cam is a d17 it will be small but putting it in a d15 it may be alright

Slo Mini me

· #16 · Feb 25, 2014

BeerDrinkin said:
DOHC ZC head is the best flowing d-series head off the shelf period.

There is a pretty solid following around town on my end as far as the ZC DOHC series swap wise. I am not sure if its because they are forgiving, Cost effective, Decent Hp numbers stock or a mix off all 3. I know they sound decent with a respectable exhaust.

Slo Mini me

· #17 · Feb 25, 2014

Evanguy said:
Every engine japan has is a zc,
a Y8 over there is called a obd2 sohc vtec zc, a Z6 from over there is called a obd1 sohc vtec zc, a Y7 is a obd2 sohc nonvtec zc. an a6 over there is called a obd0 sohc nonvtec zc.

Also the d15b cam is a bit more agressive then a z6 cam and still sucks if your building for power, if you plan on dd you car and not reallt track use i could see using the stock cam, but unless i was in a race class that needed oem parts i would never bother switching out cams for a d15b cam

Also a jdm d15b head is a z6 head. They flow the same. And the cam would do better in a 1.5 bottom end because the ratio of cam size to cc displacment changes. So putting that cam is a d17 it will be small but putting it in a d15 it may be alright

Great food for thought. Why didn't the stateside market just keep it simple?

BCarter

· #18 · Feb 25, 2014

Bryanstheguy2 said:
I had a d16 vtec zc and yea the cam pretty agressive. i had a chipped ecu, and i/h/e on it and that puppy had some power

I guess I need a chiped ecu; mine isn't all that powerful. Lol

Slo Mini me

· #19 · Feb 25, 2014

BCarter said:
I guess I need a chiped ecu; mine isn't all that powerful. Lol

If you ever opt out of that ZC cam let me know lol. kind of a Pain n the ass to find....Yawn Face...Ok Dinner time.

BCarter

· #20 · Feb 25, 2014

Slo Mini me said:
If you ever opt out of that ZC cam let me know lol. kind of a Pain n the ass to find....Yawn Face...Ok Dinner time.

Will do; but it'll most likely be awhile. I don't see me needing to upgrade it for awhile. Lol

1 - 20 of 26 Posts

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