ok i havent done it yet, but i have a theory and i've done the math for it and i wanna try for it but i dont know how much hp the internals can take for a dohc ka or if not having a forced induction system would let the internals handle more. i just wanted to know if anyone out there might know wut they could handle if i can pull this off with the ka.

 

well the only 300hp KA motor ive ever seen was a SOHC found in the 89-90 cars, they were used in some north american endurance races or something. (circuit track stuff like sebring) they were actually used in the s14 chassis for some reason (s13 is lighter but i guess there are race restrictions and after all, the s14's were partial tube frame and fully gutted etc etc)..

anyways, they had ridiculously high compression, probably in upwards of 12.5 or 13:1 and i know that they were NOT streetable due to the camshafts that were in them. they also were fully balanced and built obviously, and the design was to make power in the upper RPMs. i believe they spun to 9,000 RPM...but dont quote me on that.

honestly, you wont make 300hp n/a. i dont think it will ever be done. most people with built KA motors that go high compression have a hard time hitting 200whp on the dyno.

now if you wanted to build an n/a KA motor, and then use nitrous for drag racing it would work alot easier, as long as you got it tuned right. otherwise, youre throwing money at something that just isnt easy, but i mean if you have lots of money it can be done.

if it could be done, i would have done it by now, because i prefer a really nice torquey all motor. i liked my n/a KA, but i knew that the easy way to power is through a turbocharger.

you should look at prices of a VQ35DE from the 350Z and fabrication/wiring costs. you could have 280-300rwhp all motor with a good amount of torque, for probably the same amount or a little more than you'll spend trying to make power on an n/a KA.

but if you go for it good luck, and dont mind the haters because im sure they'll chime in sooner or later with "you're gay for even asking".

ps - crower just came out with some cams, you might try those, they seem to be the wildest (stage 4 that is) for the DOHc motor right now.

 

rods are proven to 500, but who cares to get 300 na out of it everything is gonna need to be replaced anyway.... but redardless, an na ka with some crazy hi comp pistons, head work, cams, itbs and mad fule could do it, but for the money y not have a 300 hp turbo ka? or an sr swap?


edit: didnt think of this, a milder na ka with a crazy nos setup could work nice, the t3 formula d ae86 is running it on a 20v 4ag with good results. i still wanna see a supercharged ka

 

well i've looked into the insurance out here in texas(i moved here about 8 months ago) and adding a turbo to a car out here raises your insurance around $75 a month for the insurance my dad is on(i think it's insane) so i would rather go for a n/a motor for now until i have a more steady job(right now im running fliers for his paint company) and it doesnt pay to well... and if u wanna check my mathmatics on this dan or young gun ill be happy to pm u guys with wut im thinking of doing to it and let me know if i screwed up somewhere with em

 

Mathematics? Post it. It won't happen. Dan is right.. people with cams, headwork, ecu tuning, and every bolt on possible have not hit 200rwhp.
-Jeff

 

fuck insurance, how they gonna know

 

i've never heard of insurance bumping it for aftermarket modifications, unless you're talking about actually giving them receipts for aftermarket parts so if the car is stolen/totalled, you can get the correct value for it or whatever they call it (aka you dont get $5000 for a shell, and not a dime back for $8000 in parts you spent - they'll give you a percentage back based on the parts you have covered)...that WILL raise it some since theres more to insure.


i dont really need to see numbers. in fact i dont want to see..it will make me cry...

honestly do this:

-intake, header, exhaust,
-s13 cams...or dual 248* cams, or crower/PDM, etc.
-get a ROM tune. at this point you'll probably have the most power you can really get...
-then get an underdrive pulley, lightweight flywheel and a clutch, a 1 piece driveshaft and an LSD. this will free up rotating mass and you wont get "power" power out of it but it will put the power to the ground and you'll in essence feel faster, it works but im tired and not up for explaining it. get nismo mounts and a spl tranny mount, those help too.
-get a pair of electric fans when you do the pulley swap, and take the clutch fan off. hoenstly this doesnt free up much but it helps free up space and maybe the butt dyno will help you feel it a little bit.

after that, if you're truly into drag racing it, setup the suspension for it, remove some of the weight from inside if you can stand it being louder or ugly (aka seeing the inside of the panels and stuff --- i myself prefer full interior and it looking nice and classy)...get lightweight wheels and good tires for racing.

then if you want more power, jsut get SOHC pistons and put them in a DOHC block, pick up some 370 injectors and get the ROM tune retuned...that might net you some extra power and will be good for some okay times...no crazy 13's (maybe on slicks a 13.9 i dunno???) but it will be damn fun.



if you DO all that (or at least up to the piston swap part....i suggest going to an auto-cross or a road race session...you'll probably find that once you learn to drive it it will not only be even MORE fun...but you'll do surprisingly well....the 240 likes to turn and handle, even though going straight is fun in itself.

 

No, they do. It becomes a faster car, more dangerous, more likely to get into an accident. So, some companies (progressive does not as far as I've asked) bump up insurance. The reason a GST is much more expensive than a GS to insure, even though the car is fractionally more expensive.
-Jeff

 

^ I've never told my insurance about it. Dude, turbo that puppy. You will love the feel of having your car put your ass back in the seat when you roll into the gas. Unless of course you plan on building a full road race car I don't think you could keep a built KA like your talking in its powerband.