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#1
10-31-2003, 12:46 PM
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N/A set-up question..
to what extent has anyone in here ever taken a naturally aspirated set-up on a ka24de? i mean beyond IHE. my car is going to be for auto-x so i don't want 300hp. i was wondering if anybody had experiance with cams or ecu's meant for an N/A ka24de. at its most basic point my idea for this build up would include: exhaust, straight pipe (i have a cat for inspection), header, intake, JWT cams and JWT ecu. then i would proceed by buying a light weight flywheel, cam gears and pullies from unorthodox.
(anything above any beyond that would include high comp. pistons, head porting, manifold porting, valve assembly work, and such which i haven't researched yet.) what do you guys think of that basic set-up and what else can you recommend? i'm looking for cooling, fuel system and ingnition recommendations (tho i think the JWT ecu would handle the fuel and ignition duties.) 
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#2
10-31-2003, 01:22 PM
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Forget those JWT cams, they only make camshafts for the KA24E. We"ll just say higher lift cams instead. (i don't want to profile of the cam to be too extreme, this is my daily driver). i found places that sell them but typing KA24DE camshafts into google. i'll most likely go for a nismo product.
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#3
10-31-2003, 05:38 PM
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PDMracing makes KA24DE cam shafts...they are good too...make your needle bounce off the revlimiter like crazy...good response...
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#4
11-03-2003, 05:43 PM
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Ferrea makes some valvetrain components.
I would focus on your valvetrain and head mainly. This is where you are going to make some more HP as compared to the regular I/H/E setup. I believe you can easily get 200hp with that stuff alone then you can move into some bottom end work with raising the compression for more HP and something I haven't seen, some Individual Throttle bodies. Don't take my dreams though LOL, I want to get some ITB's... People have stated they can get in the arena of 40+hp from switching over to ITB's with velocity stacks compared to the regular plenum, single TB, MAF, filter, and associated piping. Not to mention besides the HP improvement this modification also makes the car better suited in racing conditions with great throttle response. Pulleys Header Test pipe Catback 60mm Cam Gears Cams Head Porting Valve job oversized valves lightweight valvetrain components higher compression pistons individual throttle bodies stand alone engine management Lightweight flywheel Lightweight wheels Lightweight Driveshaft I would love to see what that could do on a 240sx! I also think its a far more reliable setup then turbo, lot less piping, lines, parts to buy, oil lasts longer, less heat, no sticky wastegates, no spiking boost pressures lol, it just hauls ass when you get on the throttle immediately, no turbo lag and excellent throttle response. However the higher you bring up the compression, the more power you will make, you will need fine tuning to accomplish this, race gas, and the higher you go the less your engine will last, so its kind of a trade-off medium zone you have to find in that department, if you have a good budget and like to build engines a lot raise it up a lot and get some killer HP!
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#5
11-06-2003, 04:31 AM
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You should expect these power gains at the following stages of modification:
Stock: 155 bhp @ 5600 rpm 160 lb-ft @ 4400 rpm de-catted: 163 bhp @ 5600 rpm 168 lb-ft @ 4400 rpm remove engine fan: 168 bhp @ 5600 rpm 173 lb-ft @ 4400 rpm S-AFC + timing change: 177 bhp @ 5600 rpm 182 lb-ft @ 4400 rpm unbaffled muffler, or straight pipe: 185 bhp @ 5600 rpm 191 lb-ft @ 4400 rpm intake (Injen, AEM, etc.): 192 bhp @ 5600 rpm 198 lb-ft @ 4400 rpm cold/ram air box (60 mph): 200 bhp @ 5600 rpm 206 lb-ft @ 4400 rpm header: 209 bhp @ 5600 rpm 216 lb-ft @ 4400 rpm Stillen cams: 228 bhp @ 6100 rpm 216 bhp @ 4900 rpm port work: 239 bhp @ 6100 rpm 216 lb-ft @ 5500 rpm 10:1 pistons: 266 bhp @ 6100 rpm 239 lb-ft @ 5500 rpm The torque curve you would have with the port work I discribed here would be better for a drag race than auto-x. A broad torque curve is better for autocross where as the high rpm is better for dragging. As you can see the port work done here narrows the usable torque curve in favor of high bhp. The is done by bringing the VE from about 86% up to about 91%; this comes at the price of the low-mid range torque however. Some will say these numbers are high for these mods, this is because real power gains come from tuning and parts, not just slapping new parts on. The ultimate power you achieve is up to you. BTW: these power levels could be attained for less cash if you went with the KA24DET setup. I believe the Stillen under-grind cams cost over $700!
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#6
11-06-2003, 04:57 PM
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thanks for the answers. i have til after winter to decide what to spend my cash on. between a kat, and sr20 and the ca18, i'm havin trouble figuring out what i want.
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#7
11-06-2003, 07:55 PM
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FYI: Dont remove the fan if you're going to be racing. If anything, put in a lightweight electric one. Also, if you're going to use it for autocross, then you are going to want some torque. In that case you would want a turbo setup.
SR20DETpower, do you know anyone who makes ITBs for the KA?
__________________
Isitcontagious.com '92 S13 coupe KYB adjustable struts + Whiteline springs Urethane bushings in all control arms and subframe Cone Filter Next up: LSD RIP #05 
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#8
11-08-2003, 01:21 PM
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now, before i got my 240, i heard stories that there were pretty good HP gains with just IHE. are these stories remotely true? keep in mind i was a honda guy for quite some time (sohc honda at that) so big gains to me aren't much. if i ended up strapped for cash because of my car paint job, what kinda HP gains can i expect for IHE and test pipe? my car is a 91 with a ka24de in perfect working condition.
Last edited by grncivicdhr; 11-08-2003 at 02:28 PM.
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#9
11-08-2003, 03:26 PM
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Re: N/A set-up question..
ihe.... 12-14hp all together, assuming intake is a cold air one with the extension.
electrical fan along will give you about 6hp.
__________________
438whp / 373tq - 11.9 @ 126 
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#11
11-09-2003, 05:19 PM
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nobody makes individual throttle bodies for the KA24de. However you can buy custom setups, or you can make your own. This is the idea that I had using SR20DET GTiR intake manifold. These t/b's will support a KA and have good enough flow rates. Some botching up of it will be required. it is purely a custom setup, do not expect it to bolt on. But these can be found relatively cheap compared to custom ones which are in the thousandS.
Id be into just keeping some velocity stocks on top of the t/b's. Cutting away the runners on the SR's manifold. I would also cut up the flange that mounts it into the head to resize it for the KA. You would also need to port match the intake in the head. Keep the throttle setup on them, you will need to customize a throttle cable to run with it. Some people like the style of them how they are stock. This is individual throttle bodies, runners, and a plenum. This would be good for a cold air induction system, or forced induction. Running the velocity stacks you will get a much nicer sound, infinite flow ability....you will have no restrictions like small piping, filters, or bends in the intake, it will suck up as much air as it can take. I have heard rumors of people gaining about 40hp when they switch over to a setup like that as compared to a standard single throttle body/plenum style. Of course a MAF sensor is out of the question for velocity stacks so you will need a new computer that can handle this. You could use a MAP sensor or a computer that recognizes engine speed on the crank and also uses the TPS to determine how much air is comming in and what fuel is needed. Some guys are still working out this MAP sensor on ITB's. Some are trying to convert it so it will output just like a MAF sensor, hence needing no real computer modifications like an expensive stand alone. This is not your average bolt on modification be forwarned.....
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#12
11-10-2003, 11:54 AM
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Re: N/A set-up question..
Quote:
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#13
11-10-2003, 02:12 PM
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all over the place you can find em, make custom ones, buy new ones are a little over 200 bucks.....
I would get two electrical ones wires to a switch, but do not forget to turn them on, just make it practice to turn them on before you start the car or something.... I dunno if anyone has anything like an electrical water pump for the KA, I know these are made for chevy v8's and the like, they save some HP too, but same like fans, don't forget to turn it on lol. Also with an electrical water pump you can cool your engine without it running like in the staging lanes at a drag race.
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