DOHC parts on SOHC engine?

[Light]

The title is a bit misleading seeing as how I have a lot of different questions with these two. Here goes:

I'm needing a new daily driver. I'm looking at one of two 1st gen's (a 90 or a 93), and apart from which I should choose, I have a mess of turbo parts for a ka from a 95 DOHC. The plan is to turbo the daily for a while until I get the other motor together for my 95. It has everything needed to complete it on the 95, 72# msd top feed injectors, forged internals, t3/to4e turbo (I believe this is what it is anyway), the works.

What I'm wondering is, can I slap all that and run a low boost setup on an earlier dohc engine (93), or can I run it on a way earlier sohc engine (90). The 95 has a tuned ecu and safc-II which I heard people hated the apexi but I have no experience with it.

Would it be logical to get a sohc with low mileage or a dohc with a bit higher mileage (120,000) and just requires a 5 speed swap?

Of course I'm getting ahead of myself, I need to sell one of my cars first, but I'm just wanting the knowledge for when I eventually get a hatch or coupe.

[Light]

For reference here's the two choices:
http://zilvia.net/f/cars-sale/386524-fs-ft-93-240sx-mostly-stock-alot-parts-ie-5-lug-bbk-etc-alot-pics-no-56k.html#post4060608
http://philadelphia.craigslist.org/cto/2369478085.html

[Matt93SE]

I think your'e going for a helluvalot of work..

[Tower240sx]

for your purpose all the turbo kit parts will bolt to the s13 DOHC, (except top feed those won't bolt to any DOHC as im sure you know

SOHC not so much, the exhaust mani is very different, stay with the DOHC motored car or get the SOHC and convert it, no sense doing the development 2X

[Light]

True, I guess that settles it.

Now I know 120k is a lot of miles as well as I know that reliability depends on the tune and what not, but I'm not looking to severely weaken this engine for daily driving, but what would be the limit for psi on a turbo of that size? And at what level do I have to tune the ecu?

[Tower240sx]

you 'll need to add fuel and remove timing, so

the motor will be happy with less than 5 PSI more than that and I think you are gambling.

IMHO daily drivers without back up (and by back up I mean a second car that runs simply by turning key) shouldn't be played with.

Get the "other" car together install your kit on that, keep yourself from hating...yourself

[Def]

My S13 has been really reliable, but I would still not mess with turboing a daily driver that you're depending on.

[Light]

Hmm.. I guess I'll have to find out. Well, I'll be having a third daily my current one.. I guess I'll have decide later on.

Tower can you explain your post more? Are you saying that if I decide to go over 5 psi then I need to tune the ecu and what not or what are you saying there?

[Light]

Also just came across a 300 whp stock internal 120K ka on it on 12 psi with a good tune from Nistune. I guess it its pure chance to an extent. I'd imagine even if I didn't beat on it everyday after I took everything off I'd still have shortened the life of the engine.

[WorkInProgressK]

Its doable if its well done. Or stockish aka sr.

[Tower240sx]

In my opinion if you are adding any boost you'll need fuel management,

I wouldn't go more than 5psi on a KA that I hadn't refreshed, that had to start for me to collect a paycheck.

I mean Guys make 500hp on stock internals all the time (once) but that isn't reliable, it will break obviously.

everything will break at some point, how fast do you want to burn that fuse, %psi on the street in a KA is plenty of motivation for a 240sx to commute and keep you from getting blasted by ricers and mustangs with 3-valves.

[Light]

True, I'm just looking to have a little fun until the other is done, that's all.

So back to my question on the Apexi safc-II, is this a waste of time or is it do-able for only 5 psi?

I've just heard it's garbage.