Civic-EG.com Forum 3.3.1

- Sun Apr 20, 2008 3:51 am #51612 Hey everyone. I know the d15z1 is an engine with almost no potential due to its really small intake valves. I know though, that the d15z1 has low compression. If I were to put the d16z6 head on it, it would make the engine compression around 7! ... so with this information, I think it would be a great opportunity for a turbo set up with about at least 8psi Now... I need help with more information. It sounds easy, but I want my set up to run reliably and not throwing a rod or something. The thing is though, the d15z1's connecting rods are so tiny and thin! Would this turbo set up eventually break them or no? Also, is it possible to even make this set up smog legal? I live in California, and we are popular over here with our strict emission laws . I need information on this set up. I do not want to build everything up and have it just die shortly after. Thanks again... and sorry if there was a post up like this... I didn't see it

- Sun Apr 20, 2008 4:07 am #51615 Tiny Rods = low strength, thats common sense now,

I've been runnin my D15Z1 for about 16 years now, 285,000+ on it... just with headers and open air box...things been runnin ok, i'm not to sure how good the block would hold up, better off to get a LS block for good low compression.

- Sun Apr 20, 2008 4:24 am #51619 Yeah I know its common sense, I just wanted to see if some one out there had a similar build to tell me about their experience. Yeah, I have thought about just doing a whole engine/tranny swap, but for some reason I am more interested in just making the sohc engine decently fast. Thanks for your advice



Any one else with their opinions or knowledge?

[chrono404]

- Sun Apr 20, 2008 4:38 am #51621 A very good resource is Turbod16 .

I wouldn't go over 220 Wheel Horse Power on Stock rods. (Rods start to break at around 250hp[crank, not wheels])

If you get Forged Rods go for the sun. Boosted Single's are tons of fun to run around on.

2017 Chevy BoltEV DD |2001 Honda CRV SE

- Sun Apr 20, 2008 4:48 am #51623

Yeah I know its common sense, I just wanted to see if some one out there had a similar build to tell me about their experience. Yeah, I have thought about just doing a whole engine/tranny swap, but for some reason I am more interested in just making the sohc engine decently fast. Thanks for your advice



Any one else with their opinions or knowledge?

although it would be very interesting to see this project, ive never seen a built/turbo D15z1, if you do decide to go along with this project, i will support ya !

Save the SOHC

- Sun Apr 20, 2008 6:01 am #51633 Awesome. Thanks guys... I do not have a lot of money all the time, but I think I am going to try this project out. I guess I will write up a review to inform everyone else about this build ( if it is successful or not)

- Sun Apr 20, 2008 7:45 am #51646 i think you should throw a Y8 head with a skunk2 cam on the Z1 block, that might raise your compression up a tad without modifying the block, i would deff recommend and hondata head gasket though, i'll let you know if i think of some more stuff.

[suspendedHatch]

- Sun Apr 20, 2008 7:42 pm #51715 I have never in all my years seen someone put a after 7:1 compression ratio. I can only imagine how hard that car would suck to drive.

You'd make more and better power with the stock compression ratio and some careful tuning.

Gap the spark plugs correctly, run the right heat range, and tune the ignition and fuel properly and there's no reason to lower compression. You could get the Endyn FI pistons and actually RAISE compression from stock w/out detonation.

I hope I've been helpful.

- Mon Apr 21, 2008 7:06 am #51817 If you read my son... the for the low compression is a plus for a turbo... I would not swap the z1 head for the z6 head to run as a daily driver/naturally aspirated with 7 compression.... Im not stupid... Thank you though ... I would only swap to perform the turbo!... (because to turbo the z1 engine... the spooling time would be to long... and not enough power...)... If you have seen the z1 head.. the intake valves are smaller than a quarter...almost like the size of your thumb...

- Mon Apr 21, 2008 12:14 pm #51837 your pistons will melt down before you break a rod..... all you need is really good tuning. my friend ran 12lbs on a stock z6 for a year, then the sending unit broke off the back of the block. he made 235whp with his setup. so boost it and get an awesome tune

92 hatch build in progress.....

Snap-On Tools!

TEAM NSN to the fullest!!

East Coast is the Right Coast!!!

- Mon Apr 21, 2008 1:13 pm #51842 freakin awesome... thats what I want to hear ... alright... I am pretty sure I am going to do the setup... and yes... I do plan to get a great dyno tune after the turbo is installed. Thanks everyone... I will make sure to put up graphs since this build is not "popular".

[suspendedHatch]

- Mon Apr 21, 2008 6:32 pm #51888 You're not understanding me. Less compression makes less power, whether it's turbo or N/A. You will make more power with less boost on stock compression than the setup you propose. The only caveat is that you will have to tune it properly.

Less power!

Compression helps spool the turbo. Compression is great for daily driving where you effectively drive around n/a all day and only get into boost on the freeway on ramps. Do you want to be driving around all day with Civic CX power?

The only reason you'd want to lower compression is to reduce the possibility of detonation. But instead you should simply tune the ignition and fuel so that there's no detonation. Reduce timing and douse detonation with fuel. The stock compression is not so high that you can't get away with 91 octane.

You're using an old line of thinking that applied to high displacement, poorly designed, domestic engines. Recycled engine designs. This is a mid nineties Honda built from scratch to maximize efficiency and power without increasing displacement. Catch up to the times.

Besides, 7:1 is too low even for that line of thinking.

Endyn actually INCREASES compression considerably with his pistons designed for boost. And it's completely safe from detonation.

On your setup you could be running 9.6 to 10.6 compression ratios with Endyn Roller Wave pistons.

- Tue Apr 22, 2008 4:18 am #52013 ... Damn!... That almost just destroyed the plans I had for it!!... I still am determined to try .. but I am not made of money and I cant afford to screw up the car and just get "another motor" .. freakin a! .... I still want to do more research and homework on this build.. but in the end I might just do a d16z6 swap.. and then later on turbo THAT build... freakin A! ... thanks for your advice suspended. It honestly does help... we will see what happens..

[suspendedHatch]

- Tue Apr 22, 2008 4:28 am #52015 Sorry for the bad news but I'm glad I got through to you before it was too late.

So I think you should look into some pistons. The Endyns are pricey but very much worth it if you can afford it. A lot of people have been using the so called "vitaras" with some good results. Not sure how much that costs but you should look into that.

Never take one person's word for it over the internet!

- Tue May 20, 2008 5:47 am #56032 well ladys and gents....i am currently running a z1 block with a z6 head. dc4-1 header y8 manifold short ram with velocity stack b16 throttle body..n/a dd..shit is slow but gets me by....z1 rods are the same as z6 rods..from what i heard and read from turbod16 and d-series.org doing a z1 block and z6 head is like doing vitaras in a z6 motor....the guys are right.. both me and u are in the same situation...broke want to boost with out blowing that shit up....i think there are good and bads...low compression would be good less chance to det. bad for dd unless you hit some boost... horse power goals..i wouldnt try for more than 220 deffently have a good tune..if not that shit aint gonna last long..as for me i was boosted. but a z6 motor..wasnt tuned and ran it like hell..greddy kit..was only try it out to see if it was worth keeping it sure was but it ened up knocking bad.. now i have a n/a dd...so if i were you just invest in a spare block to build and run n/a untill your ready for boost...not having a running car suck...good luck on the path choose but cosider the thing we mentioned