*Sticky* Ultimate KA24DE

[ESPER]

I created this thread with the idea in mind to list ALL possible mods that can be done to the KA24de, prices and results. Then ppl can decide how far they want to go.

i am going to post up my dyno soon as well, and others hould too depending on what mods they have.

Feel free to share experiences and opinions!!

On with the thread!

MODS: (Prices are estimated)

INTAKE:Short Ram ($200)Cold Air ($450)*Note, the short ram can be modified for cold air with custom extended pipes, tubes, etc. (Prcies vary, mine cost $10)

EXHAUST:Full Catback single pipe (either 2.25" or 2.5")(Brand name $500, custom $250)Dual system (N1 duals)

HEADERS: ($300-$400)4-2-14-1?

LIGHTENED PULLEYS: ($300-$400)Full Set, (alt, crank, pump, air con)Single (Crank)

CAMSHAFTS:($300-$600)earlier model '91 ka24de PDM

CAMGEARS:?

PORT AND POLISH:Head-Valves-Manifold?(Estimated Price?)

CPU: ($600)Jim Wolfe TechnologyPossible ideas on how to reprogram existing CPU?

HIGHER COMPRESSION:($?)KA2(E) Pstions + Head?What are the cheapest?

GROUND WIRES:Hyper Ground/Brand Name ($200)Custom Speaker Wires ($40)

Well thats all i believe thats the bestthat can be done while keeping it All-Motor. I didnt include test pipes, non-cat cuz thats def non street legal, at least with these mods, u might be able to keep it close to legal? hehe

Anyways, I am almost done with the mods here exect for, port/cams/cpu/higher compression and then i will have dynos ASAP

[goomba240]

Whoa you definately forgot some things! I'll make a list when I get home from work.

[ESPER]

Hmmm, the last thing i can remember,

LITER INCREASAGE:Boring out the cylinders to 2.5 liters (Max? Price?)

[goomba240]

You defianately dont wanna bore a KA.

[nlzmo400r]

it could be done, but 2.4 liters is a pretty good amount of displacement from a 4 already, and if you're not going turbo, the cylinder walls could be thinned a tad

[corn322]

aluminum flywheelbigger throttle body

don't have prices

[ESPER]

IGNITION: Ignition Spark Amplifier (MSD, $150)Performance Spark Plugs ($5.99 each)

[Aries]

keep this going.once we get a good list, I'll make a sticky out of it.For now, you're missing a whole lot of things just for the N/A KA.

[gg250cc]

electric fan swap, did mine for $20 bucks, just took off the belt driven one and left the A/C fan on then wired it to a thermostat. I think it made a bigger difference in throttle response than my UR crank pulley. And no overheating problems. Ill try to post a pic soon

[ESPER]

yeah which fans did u get for $20? and yes lets see the wiring!

[ESPER]

ok, lets be more specific, lets keep the car all motor, and lets limit the mods to the engine. that way we can keep it direct and precise, (instead of naming EVERY mod that can be done to the total car or its behavior, like suspension, )

MODS: (Prices are estimated)

INTAKE:Short Ram ($200)Cold Air ($450)*Note, the short ram can be modified for cold air with custom extended pipes, tubes, etc. (Prcies vary, mine cost $10)

EXHAUST:Full Catback single pipe (either 2.25" or 2.5")(Brand name $500, custom $250)Dual system (N1 duals)

HEADERS: ($300-$400)4-2-14-1?

LIGHTENED PULLEYS: ($300-$400)Full Set, (alt, crank, pump, air con)Single (Crank)

CAMSHAFTS$300-$600)earlier model '91 ka24de PDM

CAMGEARS:?

PORT AND POLISH:Head-Valves-Manifold?(Estimated Price?)

CPU: ($600)Jim Wolfe TechnologyPossible ideas on how to reprogram existing CPU?

HIGHER COMPRESSION$?)KA24(E) Pistons + Head?What are the cheapest?

GROUND WIRES:Hyper Ground/Brand Name ($200)Custom Speaker Wires ($40)

IGNITION: Ignition Spark Amplifier (MSD, $150)Performance Spark Plugs ($5.99 each)

ELECTRIC FAN:Replaces the beltdriven fan ($20)

FLYWHEEL: (Aftermarket $400-$500)Lets the engine rev faster, but drop off fasterpreference based as lighter flywheel deducts from torque feel giving an engine mismatch feeling

FUEL FILTER: ($5.00)Nissan Z33 tt fuel filter, increases fuel capacity, may allow engine to rev slightly faster due to the fact that it can draw fuel faster from the larger filter.

OIL:Use Full synthetic oil only for maximum HP(Mobil 1 is $5.00 a bottle)

FUEL:Higher Octane or Use NOS brand Octance booster $7.00(supposedly option mag said this one works better than competitors)

[Ceptos]

what about valve springs + retainers, valves, lifters, and connecting rods?

i know ka24de.com sells some of this, but which ones are optimal for an N/A KA and not the turbo? (i know they specialize in turbo KA) and what are other options?

any other internal parts along the same lines?

will the stock injectors and fuel pump be sufficient?

just questions to help the list along

[ESPER]

hmmm good point and questions.... lets see if some others are replying, how far should the enigne build up go?i think we should stay away from a full engine build up cuz its too pricey and mostly everyone would just spend the money on the sr20det or ka24det.... so yeah what do u all think?

[Ceptos]

well, for my own project i plan on replacing all the internal parts i listed and any other major parts along the same lines (not looking to upgrade everything, but anything as major as say valve springs), port and polish, .1 liter bore if it is practicle (would you need a new head gasket? what about pistons...larger rings?), and ka24e pistons. this is all going to get done when i get the motor rebuilt and a 5speed swap...so im excluding all of the bolt-ons to save money.

most of the internal parts are not too expensive, connecting rods from ka24de.com are 600 tho, and i have not been able to locate lifters yet.

after that i will get things like pullies, cams, i/h/e, fuel system, and ecu.

i was getting close to posting a thread asking about this kind of stuff, so i can start buying the right parts this summer...so ill be on the lookout

[gg250cc]

yeah which fans did u get for $20? and yes lets see the wiring!

Actually there is already an electric fan on A/C equipped s13s, it suprised the hell outa me when i took the belt driven one off and bam! theres an electic one in front of it. anyway I took the belt driven one off, got a electric thermostat from autozone($15) and wired into the elecrtic fan, removed the stock shroud and made a aluminum one for $5. It really cleaned up the engine bay, made a noticable difference in hp and was cheap. GREAT MOD. Ill get some pics soon

[crzycav86]

Don't forget intake manifolds.

Tuned runners can increase VE to 120% at a certain right rpm, and with other breather mods..

[MikeMurphy]

JWT? bah! An aftermarket engine management system will net you big gains. They do, however, run a premium one week before Race Wars.

[ESPER]

mikemurphy, are u serious ? i think u watch too much fast and furious bro, take it easy

[180fan]

ooo I've been eyeballing a tec3 standalone system for some time now or there's that new aem setup.

[420_240sx]

was just about to say what esper said

how about removing EGR, AIV? Those are pretty much free mods.

[GEO]

GUYS MOST MISSED UPGRADE! NOS, mother F UCKERS!

[bozuzu]

:uzi nitrousi'll add a few.check out "rebello racing spencer low caters to offroaders but makes/sells awesome performance stuffunorthodox racing underdrive and pulley kitstillen flywheelje rods and pistonsnismo pistonsgude racing port and polished headbullfrog camscrane springs/retainersdoug thorley headerhot shot tri-y headerpacesetter 4-1 headerplace racing at one point made highly expensive intake manifoldsjet and other fuel railsnismo bearings for everythingfbi cold air intake (for trucks, modifiable)centerforce clutch kits (technically motor. . .)venom products for "you get what you pay for performance"apc products for "you get screwed and then laughed at performancethat's all i can think of right now. a lot might only be for ka singles, but not sure

[drifts14x]

For a Fuel System Controller, the Megasquirt cannot be beat, my friends on the RX-7 Boards swear by them

Megasquirt fuel injection controller

[deviousKA]

Megasquirt is the best on the list so far, opens many efi options like larger throttle bodies, individual throttle bodies etc.... Its powerful, and cheap. It also allows for different ignition setups ie. distributorless. I dont think it has yet been adapted to 240sx, mine will be up and running in car soon, with itb's and distributorless ignition.

As far as shortblock goes:Inserting allen plugs in crankbalancing with rods and pistonsbullnosing/knifeedging/lighteningvarious treatment processess

Dry sump or crankscraper for the pan

Head:stainless valves/stiff springs/ti retainersjwt/pdm/nismo/custom regrind port and polish with serdi multi-angle valve grindbowl polish workjwt cam gearstsubakimoto race timing chain (single) upper and lower

aluminum flywheels, clutch master, centerforce, fidanza etc...lightened pullies asp, unorthidox etc...

S&S, hotshot, obx, greddy, or custom equal length header

Extrude honed intake manifold, or custom plenum typeindividual throttle bodiesmikuni/weber sidedraft carbs

ultimate ka24de would need to be running around 12:1 compression ratio or more, with race gas or other detonation prevention methods. Making good power up to 8500rpm is not unrealistic with stock rotating assembly geometry.

raising displacement to 2.5l will not give you that much, and i would suggest larger valves (for anyone that doesnt know, my ka is 2.5l).

Its all in the high compression, cams, and custom efi/intake. Those will yeild the biggest gains.

[keepingthe240]

I've yet to take apart a ka, but i've taken apart more then my share of sb chevys. Heres stuff that might work. Billet cams with roller-rocker arms......check the water pump impellor(on the chevys there was alot of loss..bad design) and machine(debur) the oil pump( a high pressure hi volume oil pump on a chevy takes 5hp more then stock to operate) Does the motor need a windage tray??

[Veriest1]

Hmm... if I'm not mistaken their is a thread around here somewhere listing KA24E pistons that fit in the DE model and raise compression ratio. I don't remember where it is but it should be searchable.

[ShifDown96240SE]

Just get the whole engine overboared, stroked, top of the line internals(whatever company you are comfortanle with), decking, shotpeening and micropolishing the crank, bigger cams, bigger compression, change the timing and fuel systems, JWT ecu, etc...I was going to go full out NA but its not that worth it if you want larger numbers, although the feel and sound of this engine fully built and tuned right is unbeatable!!!

[keepingthe240]

I've yet to take apart a ka, but i've taken apart more then my share of sb chevys. Heres stuff that might work. Billet cams with roller-rocker arms......check the water pump impellor(on the chevys there was alot of loss..bad design) and machine(debur) the oil pump( a high pressure hi volume oil pump on a chevy takes 5hp more then stock to operate) Does the motor need a windage tray??

Anyone want to comment on the roller rockers??

[crazee240sx]

Anyone want to comment on the roller rockers??

Im still waiting for that comment too...roller rockers..

[stash420sx]

external oil coolers, electric waterpumps, removal of AC, extreme compression and race fuel. ported head, cam gears with timing advance <- which i cant figure out yet. synthetic oils, reduce internal engine friction.