3" exhuast too big for KA na?

[Newcastle82]

I've got a NA ka-e, early production with flat-tops, head work (gasket port, angle job, shaved head), intake port-matched to head w/ secondary butterflies removed, hotshot header, injen short ram, high-flow 3" cat and 3" catback to a magnaflow 3" muffler with timing advanced 4 degrees. It rips. Absolutely retarded fast for a single cam. Haven't had it on a dyno yet or even clocked a 1/4 mile, but I have no problems killing gsr's and civic si's with equal modding. It's loud, a lot louder than stock, but the difference between the KA growl and the Honda sewing-machine sound is very pleasing. Go ahead and run 3" piping. You'll love it. My s13 is a freakin' missile =)

[4gotn1]

i dont know if i have an a high compression ka24e or not. does anyone know how to check, because this is my second engine and i know it was pulled from an 89. oh well, i just know mine is hella fast. and it is loud. see sound clip above. heres the list of mods done to the whole car. its kinda long.

engine:obx header, custom intake kyo exhaust 2.5 in test pipe port matched intake and exhaust 280zx turbo oil pump magnecore wires beru silverstone plugs msd blaster 2 coil asp underdrive pulley removed emmisions (completely) obx adj fuel pressure regulator 300zx fuel filter walboro fuel pump bypassed throttle body and intake manifold coolant lines 16in electric fan conversion removed secondary butterfly valves nismo motor mounts nismo transmission mount myth concepts tuned ecu removed ac (complete) battery relocated to trunk custom valve cover myth concepts ground kit exedy stage 1 clutch obx short shifter moble 1 synthetic oil 15w50 moble 1 synthetic gear lube 75w90 (transmission) moble 1 synthetic gear lube 75w90 (differental)

suspention: eibach sportlines kyb grs rear subframe spacers front and rear poly sway bar bushings front and rear poly end link bushings front and rear strut tower bars 17x7.5 white 6 spoke rims 235/45zr17 michelin piolt sports 180sx jspec limited slip differental

misc:removed front bumper support removed passenger seats removed trunk linings removed spare tire

body :d1 drift front end clear corners

interior :faze boost and water temp guages no name air/fuel ratio gauge custom blue lighted needles euro reverse glow guages custom painted interior components no name head unit pioneer 6x8's in the doors no name 6x9's in the rear deck 5.6 in lcd tv 2 15in pyramid subs sony 1000w 2 channel amp axe g2 racing seats

thats all i can think of. it pulls hard to the 7k redline. i havent had a chance to race many people.

[180fan]

KAE's from the initial production run from 88 to to early 89 had the high comp.

[4gotn1]

i know that but all i know is the car mine was pulled from was an 89 coupe auto. i know it had an lsd in it but it was trashed, the car was wrecked in the rear, bad. i didnt get the production date of it. but i did get a great find on the engine it only had 62k on it that was 3 years ago and the car is since gone. so i have no way of knowing if it is or not.

[dubstyles240]

back to the exhaust.... whys backpressure so bad?

[Chaotic_Warlord]

back to the exhaust.... whys backpressure so bad?

THink of a car as a living body, your wheels are feet, your suspensions are legs and muscles so on and so forth. The exhaust system in a car are like your lungs, the less pressure on your lungs the easier it is to breathe and more pressure on them the harder it is to breathe, like the difference between healthy clean lungs and dirty smokers lungs (I'm a smoker so I started to notice the difference after I started) Think of backpressure as like this, imagine running down a road, now try running that same road only this time withe more air than you can breathe, this is backpressure, while you're still able to run, you wont be able to runs as well or as fast, especially once you start off with because your lungs can't handle the amount of air coming in, but once you finally do get up to speed your lungs adjust to the amount of incoming air and compensate for it. This is why backpressure is bad, same as if you tried to run with not enough air, while you'll get a good start by the time you reach top speed you'll be out of air and lose energy. Hope this answered your question.

[eddiec]

this is how i picture it. your motor is a pump. a big overweight air pump. it pumps air in, blows it up and pukes it out. backpressure is obviously pressure against the puking exhaust. so by putting backpressure on the exhaust stream reduces your pumps efficiency. this is also why intakes are good. it helps the pump suck in more air and is why most people's first mods are intake and exhaust.

now back in the old days the old timers would say that you needed backpressure to make power. but that was the old days.

[own3d]

will a 3" catback made for the sr bolt on behind the ka cat? im getting an sr in a few months but since i have a NY car my exhaust is rusted out and broke off after the resonator. i dont wanna buy a catback for a ka then buy another catback for an sr.

[Nicksemianiw]

Redline on KA24E's are 6500 not 7000, the KA24DE was 7000 RPM redline. FYI

[4gotn1]

but with my retuned ecu courtesy of me/mythconcepts.com i redline at 7000. we are also selling them for a lower price than jwt. 250 with a refundable 50 dollar core charge. im going this friday to get a dyno of the multiple na tunes i have made and see which one pulls and yeilds the largest gain. we are currently working on ka24de and turbo applications.

[SMoKeM240]

the E pulls harder th 7gs than the DE

[own3d]

will a 3" catback made for the sr bolt on behind the ka cat? im getting an sr in a few months but since i have a NY car my exhaust is rusted out and broke off after the resonator. i dont wanna buy a catback for a ka then buy another catback for an sr.

so what about it bolting up?

[ddgsxr504]

Exhausts are not car motor specific. An Apexi N1 will bolt up to a stock KA24DE or SR20DET exhaust, the only parts that are different are th exhaust manifolds everything from there back have the same bolt patterns, as long it is made for a 240SX any exhaust will fit.

[own3d]

thanks, i thought they would but the flange on my ka's cat didnt even look 3" wide lol, guess i didnt get a good enough look, but thank you for the response

[ddgsxr504]

Actually I dont think it is but stepping up a size from cat to exhaust doesn't really affect anything.

[own3d]

i was talking about something like this(lol, i know its not exactly to scale but you get the idea), i mean the cat is so much smaller than the 3in pipe i was just wondering if the bolt holes would line up? id assume that most people with sr's would have 3in downpipes and either 3" cats or testpipes. thats why i was confused

[ddgsxr504]

The flanges are teh same size just the piping is different but yes I know what you mean. That's how mine looked when I had the Greddy short header and was still running the stock downpipe to my Apexi N1, after getting the Hotshot header and test pipe things are a little bit more even.

[own3d]

Ok, last question, is the exhaust acctually different on s13's and s14's? A couple places have catbacks for 89-99 and some have one for 89-94 and one for 95-99?
Modified by own3d at 6:57 AM 3/1/2005

[ddgsxr504]

Even though they advertise different years like 89-99, 89-94, 95-98 ect they do that so the person buying the part knows what car it applies to but in reality 89-99 is pretty much the norm (240s) on exhausts but don't quote me on that.

[dfw240_EE]

Weren't the S14 KA24DE's also redlined at 6500? I have a picture on my harddrive of a USDM S14's instrument cluster, and the redline on the dial is definitely 6500. Or does nissan just mark it that way to help keep a few people from overrunning their engines?

[:: orion ::]

Ok, last question, is the exhaust acctually different on s13's and s14's?

YES.

Dunno what they're saying inthe few posts above this...but S13 exhaust is close, but WILL NOT fit an S14...and vise versa.

For one, S13 is shorter and the bends are off slightly. Plus the muffler hangers are VERY different. Etc, etc...

So exhaust are chassis specific:

S13 ('89-94) - KA, SR...except the CA motor...that's a little different.

S14 ('95-98) - Either motor...

- Brian

[4gotn1]

to my knowledge all de's redline at 7000 stock. the e's redline at 6500 stock. but mine is not, nor is the ecu.

[NismoSilvia19]

Finally going to get a exhaust for my '95 since my stock broke just past the manifold and my muffler ha sabout had it. I'm looking at the Apex N1 and a high flow cat but I can't find anywhere to get a down pipe that mounts up to the stock manifold. I plan to run a RB in it eventually so I don't want to spend the money on a header and really looking at doing this inexpensively. Anyone know where to get one beside the dealership and if it will bolt up?

[:: orion ::]

Junk yard.

You can't get an S14 one (they are not allowed to sell cat converters, at least in FL)...so pull an S13 exhaust manifold and the "down pipe" section...bolts onto an S14 with ZERO issues, flows better that stock S14 manifold and cat section as well.

- Brian

[NismoSilvia19]

I noticed you are running an OBX header. Do you know if it replaces both the manifold and down pipe?

[4gotn1]

on mine both, and its nice too. i like it.

[DriftingJesus]

Maybe im a moron but whats the point of having you pic horse power at almost at the max revs. Im just saying though

[DriftingJesus]

Own3d I've got to say thats a very interesting pic you have there. It reminds me of my last spring break and trust me im looking forward to cancun 05'

Oh and what do guys think about that jgtc exhaust (espiel) that mackin industries just started carrying