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.