KA BUILDUP. POST ALL IDEAS

[Silvia_Freak]

Hello everyone out there that loves there KA. I have opt to build my KA since I cant by an SR20. Right now My plans are as follows. Everybody please help out with this one.

KA24DE DOHC 2.4L New Head Gasket SealsNew ValvesNew Piston Rings and Connecting Rods and Rod Bearings.Crankshaft.Bore Piston Cylinders.Shave Head down.COld AIR INTAKEHEADER EXHAUST SYSTEMSTRAIGHT PIPE 3" NO CAT.5" ROUND CUT MUFFLER.

HOW MUCH WOULD I EXPECT TO SEE HP WISE? DOES ANYONE SUGGETS PARTS? IM ON A BUDGET.

[icnuthin]

for starters good idea but the exhaust is not. headers good but have a hi flow cat for back pressure. and the pipe should be 2.25 and the muffler is what ever. i went with 2.5 inlet with 3" outlet. that big size is only good for turbo. if no turbo then you will have no power untill you are going 50 mph. all top end and no bottom. p.s. go with hotshot headers. they are wonderful.

[1991S13]

I agree with him ^ on the exhaust. Bigger is not always better! And I don't think you can do completely straight exhaust, you have to bend it in some places to make it fit.

Maybe you could do something with the throttle body/intake manifold too. Bore the TB or replace it with a larger one, then port the manifold to let more air in.

I'd go with cams too, and remove the timing chain guides, then check up on the chain and tensioners.

The possibilities are endless, search around this forum and you will get so many ideas you won't know what to do. (I've been debating a KA rebuild then KA-T setup or an RB25 for a while now).

[4gotn1]

i disagree on the exhaust system, i have obx header, test pipe, and 3in catback, and i have plenty of low end. infact on the dyno i was making 90% of peak torque at 2000 and held it there till 5500 (peak) and slowly dropped from there till 6500. i also have a sohc, and alot done. but sounds pretty good. i would suggest while you have it apart throw some e pistons in and run 11:1 comp. deck the block too. as for header i would recommend a hotshot or obx. i like mine. maybe some pulleys. an electric fan. that really helps the engine rev. port match the intake and exhaust. and what year is it? if it 95 and newer then go find some 91 cams from a junkyard.

[TheOne]

wonder when will ppl learn that the ka makes more hp with 3", it really does, there's numerous threads with dyno sheets comparing 2.25"-3".

i'd say 135-140, maybe more(thats really pushin it).

[CDE]

It's just going to be stinkin LOUD.

I would kill you if you were my neighbour and driving that car regularly.

Another thing with the muffler, just make sure you can tuck that baby up far enough. I saw a 240 the other day with a 5" round muff and it stuck way too far down and looked very fugly.

Just my .02

[1991S13]

I was always told that 3" exhaust would create more backpressure than 2.25 or 2.5". Smaller diameter pipe gives the exhaust less room to expand and cool down. Cool air is more dense than hot air, so by using larger pipe you are actually creating backpressure.

I thought 3" is a little big for the amount of air a NA 4 cylinder is pushing out, but of course I don't have dyno sheets or anything to back me up.

[ArticDragon192]

ive read the H22 TB can be used to repalced the KA's puny TB.

[Silvia_Freak]

Ok guys, It turns out that I cant do a rebuild. I'm gonna buy another engine that works and just swap it in. Sry guys I cant get the Sr or CA. I just have to find a cheap replacement. But are there any suggestions to upgrades then? LIke INtake? Headers? ???? Im really at a delema. Anything helps.

[1991S13]

Yeah I've heard the H22 fits. I've heard Q45 and N15 Pulsar too, I think the Q TB was the largest (80mm?).

What kind of "cheap" KA are you getting? SOHC or DOHC? I/H/E, cam(s), pulleys...all that is good for something. The more and more I research I am leaning toward a KA-T build. I read about 400hp on a stock bottom KA...wow.

[Dattebayo]

ive read the H22 TB can be used to repalced the KA's puny TB.

Puny?!? Its 60mm! Most engines dont even have one that is that big!The Z31 had one that was smaller and a common use is to replace it with the SOHC 240sx's tb because it is so big!

But if you really must, a direct bolt-on replacement is the N15 pulsar TB. All you have to do is bore out the sides a little from the inside. Its 70MM and available from spl-parts, one of our sponsers.

[neagan]

Will a larger throttle body do any good with the KA24DE engine without doinga larger exhaust or bigger injectors? Nitro

[1991S13]

Im not real smart with the air/fuel stuff, but wouldn't the MAF still thinking you have the smaller throttle body make the car run lean because it wouldn't compensate for the extra air? If the MAF was behind the throttle body it could do that for you, right?

Thanks, you got me thinking, lol. If you have some $$$ you could get SAFC or something like it to tune the A/F without larger injectors.

Exhaust wouldn't need to be larger, because a larger TB isn't going to send THAT much more air in. Larger intake cam would help though.

[4gotn1]

no i doubt that a larger tb will have any affect on the a/f ratio. i seriously doubt that you will need larger injectors and larger exhaust. if anything you might notice it being a little more peppy, and have better throttle responce. as for a safc. you can get it, and you might get a few hp out of it.

i also looked on the spl website and couldnt find the throttle body. what is it under, i am quite curious about it.

and yes 3in exhaust is loud, i get complaints all the time but i like it. it sounds good at wot. but i am also working on a kaet engine to swap in within the next year.

[240DRFT]

the cost of all the stuff you listed adds up to be more than a ca18

[slydin'240]

But if you really must, a direct bolt-on replacement is the N15 pulsar TB. All you have to do is bore out the sides a little from the inside. Its 70MM and available from spl-parts, one of our sponsers.

Can we get some more info on this TB, such as a year that we could pull this from. Thanks.I found the TB at SPL Parts under 89-94 Silvia - Engine - Intake. They say it is for the SR20DE(T). But it can be used for the KA?

[Dattebayo]

Heres where I found it.http://www.splparts.com/Parts/...t.asp

Here's the pic:

This throttlebody was not available in the USA, so you cannot pull it off any model unless you live there.The site recommends it for a S13 SR20DET, but it will bolt on your KA motor as well...

[slydin'240]

Ahh thats makes sense why the car didn't look real familiar. Good lookin man, thanks.