Boosting D16A9 -ZC, help needed
 

I have swaped a D16A9 - 1.6 DOHC ZC into my 2nd CRX Si. Well, now I am thinking of boosting it.
I saw that some of you have done that.
I'd like to know where is the limit on a stock motor? 0,5bar (7psi) wouldn't hurt it? What about up to 1bar (14psi)?
http://www.geocities.com/ludesi_dws/newcrx.html - here is an example of an engine (D16A6/7) that is much weaker than D16A9. D16A6 has thiner rods and smaller crankshaft journals etc.. And this ?stock? turbocharged engine runs on 10psi.
Stock CR is about 9.5:1. Is that too much for, lets say, 1 bar (14psi)? I have a chance to put in pistons from D16A6 (not sure if the piston's height is the same) - that way the CR would be 8:1 (using this calculator http://www.knology.net/~jediklc/D.htm).
Anyway, it's gonna be home made turbo kit. Which turbo do you prefer? Well, rev limit is set to cca 8000rpm, at the moment. It should start to boost over 3500rpm.

Re:Boosting D16A9 -ZC, help needed
 

Are you sure the d16a6 is weaker than the d16a9? I am running 7psi on a d15 (you think d16 rods are thin, take a look at d15 rods). Your motor can easily handle 7 psi of boost with proper tuning. With 9.5:1 c/r 14psi might be pushing it.

Re:Boosting D16A9 -ZC, help needed
 

I'd go up to 12 psi with TE/Uber to control the fuel delivery on a stock ZC.

The D16a6 isn't that MUCH weaker than the ZC. I've known people running 15 psi on d16a6's for a couple years with no problems. It's ALL in the tuning.

I would NOT put a6 pistons in the ZC. with 8:1 comp, you'll have to run more boost to get the same power, buy you'll lose any low end till you spool up. I'd stick with mid 9's:1 comp and tune appropriately. A friend of mine is boosting 9 psi on ~10.6:1 comp (y7/y8 mini-me) with a 14b and making close to 200 whp. Needless to say, he's got it tuned right running uberdata.

Re:Boosting D16A9 -ZC, help needed
 

So fuel management is necessary for going over 5psi.
I'll take pictures of D16A9 and D16A7 rods and crankshaft when I get my ZC motor apart. There is noticeable difference. How much weaker it is I can not know, I haven't blown any of these motors ;)

Re:Boosting D16A9 -ZC, help needed
 

It's not about psi, it's about horsepower ;)

Re:Boosting D16A9 -ZC, help needed
 

it should be fine if tuned right, i wouldint rev the zc to 8k thow, try to stay under 7500 to be safe, my turbo zc will be running 12psi with a 48/63 t3 tuned with turbo edit in a few days, stock bottom end :P

Re:Boosting D16A9 -ZC, help needed
 

aLL d16 cranks are the same.....I think A9 rod's are the same as A6 rod's only different rod from a 1.6 DOHC I've seen is frmo the 1st gen crx..PG6 rod's.
If you want to kill you engine early...you may rev it to 8K rpm's...it's not a B-series vtec engine...it's far from it

Re:Boosting D16A9 -ZC, help needed
 

Early d16a1 rods are different than other d16 rods, they are bigger, but they are made out of a worse metal so they are actually weaker. So bigger isn't always better

Re:Boosting D16A9 -ZC, help needed
 

i wish we could get d16a9's around here. :-*

Re:Boosting D16A9 -ZC, help needed
 

With stock MAP sensor? I was reading something about it yesterday on this forum...
I am not an expert on turbos... 48/63 T3? Can you tell me specifications? Well, i'd like to know which turbo would be OK for about 8-12psi.

Re:Boosting D16A9 -ZC, help needed
 

for someone with no knowledge and only 3 post your headdin for the high... start slow and learn more first. check all ur options then start aimin for hp's. at the moment you shouldn't be thinkin of no more then 6psi til u kno what's goin on.

Re:Boosting D16A9 -ZC, help needed
 

the exhaust side of the turbo is a 48 from a sabb and the cold side is a 63 from thunderbird, anything over 8 pounds on a zc i would get a good sized t3

Re:Boosting D16A9 -ZC, help needed
 

Just use a 14b

Re:Boosting D16A9 -ZC, help needed
 

Just to let you know:
http://www2.arnes.si/~mjereb2/IMG_0883.JPG

Re:Boosting D16A9 -ZC, help needed
 

that's like the size differences between toyota truck bottom ends and honda bottom ends, that is insane. what is the d16a7? Does the d16a9 truly have a bigger bottom end? are those pictures correct? or is the d16a7 dinky? I think we need some clarification because those pictures show humongous differences.

Re:Boosting D16A9 -ZC, help needed
 

I took the picture and it is correct.
D16A6 and D16A7 are 1.6 SOHC engines.
D16A8 and D16A9 are 1.6 DOHC, known as DOHC ZC.

Re:Boosting D16A9 -ZC, help needed
 

Ok, so I am in about the same situation as you, except that the ZC is built so I want to run up to about 15 psi. I have looked at a few turbos

T25 - I figure this is way too small for my app.
T3/T4 - .42 A/R COMPRESSOR
.48 A/R TURBINE
T3/T4 - . 50 A/R COMPRESSOR
.63 A/R TURBINE
T3 - ? AR
T4 - ? AR
14B

Given your knowledge, which turbo out of these do you think will give the best performance while retaining some decent spool times for daily driving?

Thanks! (and I did search! ;-) )

Chris

Re:Boosting D16A9 -ZC, help needed
 

thats a pretty odd picture, from what I can see that looks like comparing a D16a6 and a D15b2 crank. Over hear a D16a6 and a ZC crank is the same, they both use the same main and rod bearings. Unless something is goofy about the D16a7 crank or the d16a9 really does have bigger journals than any other D-series.

Reguardless, all d-series rods are the weak point, I wouldnt shoot for any goals over 250whp.