Ka24E high boost options?

[TooSicks]

Some of this may sound a bit overkill, especailly for a daily driver, but my definition of daily drive is probably a lot different than yours. it consists of 50 miles of open desert with a 2000 foot elevation change at the beginning or end depending on which way i'm commuting, weekends, no traffic, and elevations from 3700 to 6000+ feet. when i say daily driver, this is what i contend with.

Right now i'm in the theory/planning stage of an '89 s13 ka24e turbo. I've got 210k on the clock so the first step is new internals and valvetrain. I want ridiculous horsepower, and when i say ridiculous i mean it. I've driven my friend's ultra highly tuned 1979 porsche 928s4 euro which was dynoed at approx 750 rwhp. It was a damn fine feeling to have that much thrust try to suck your eyeballs back into your skull. That car was almost 4000 lbs tho. I'm not really trying for that much power in the s13, just something with a similar power/weight ratio approaching 5:1 would be fun.

My questions are:Assuming i do a bottom end with the beefiest rods possible, good forged pistons, all balanced, low compression, and o-ringed, without sleeving, with stock bore, how much boost would it take to blow a cylinder wall out or is this an impossibility with the ka block? I don't want to sleeve it if i don't have to but,,,,,

What kind of hp numbers is the ka24e capable of producing on the extreme upper end of boost sanity, say 30+ or 30+++ psi boost? I realize it'll take a lot of work to make it breathe good at those levels but i plan to port/polish, cam, 5 angle etc.

I'd like to be able to lower the boost from the insane levels mentioned to more reasonable levels when prudence dictates so. I know it sounds sick, and won't exactly be a long lived engine, but i figure with dual boost settings, one relatively mild, and one bordering on psychotic i can have a upper limit daily driver with the potential to pull it up a notch and do battle with anything else i may encounter.

I know i'll have some cooling, engine management, and fuel delivery issues to deal with, but that's another topic. i'd like to find out what kind of physical limitations i'd have with the block itself and what kind of extreme upper end numbers have been obtained. If i can't get them out of the KA i'll explore other options, but i think it'll be sweet to have a 4 hole truck engine that can kill tuned big blocks. I'm just weird that way.

Oh, and if you think this is extreme overkill, i'm also working on what it would take to build a non-daily driver turbine powered s13, but until i find some serious funding this will remain engineering theory.

[WDRacing]

Either use a serch engine or look a few threads above or below this one. I started this last week...

WD

[TooSicks]

WD, if my question was already answered i wouldn't have posted. i've been following the high boost, i've searched both here and other sites for the block stress question but i can't find the answer.

I said taht this was in the planning stage right now, but i might start building this week. today my head gasket and possibly head and/or rings blew up on me. on my way into work today the temp/dewpoint spread was zero and the air was thick with vapor, basically i was driving through a thick cloud layer (i live in the mountains) and when i parked my car all the water vapor in my intake condensed, pooled in my intake runners, and i suspect got sucked into a cylinder or two and hydraulic locked one. my entire airbox, and intake was full of condensation when i pulled em off, oil was full of water, and i can hear coolant blowing into the crankcase through the oil filler hole.

i'm gonna tear it apart this week and see if i need a new head.

[WDRacing]

Make sure you get the block magnafluxed, it'd be a shame to do all that work on a block that is about to crap.

I don't have any real data on when the block will explode. But It should withstand a large amount of boost(35 psi) as long as you keep the engine tuned with no detonation.

WD

[Top Speed Coupe]

WD what is magnafluxed?

[Daunttless]

Its a process of checking for surface and subsurface flaws in a ferrous material. You pour/spray particles onto an engine while you use their machine to setup a little magnetic field and you can see where there is damage to the block.

[TooSicks]

When i do it 'im gonna magnaflux the block and crank with the liquid uv machine, do a dye penetrant check, and if i can get some time on the machine, xray them too.

i'm gonna go tear the head off right now and see exactly what's wrong. i might just mill the head and toss a new gasket on if there's no ring damage, etc. matbe do the port n polish this week while it's off too.

[Turbo_Nismo_EC]

Now correct me if I am mistaken, but the KA block is iron so it doesn't have sleeves. It should be able to withstand a ton abuse.

[WDRacing]

Yep its an iron block...tons of abuse.

WD