The twin exh. cam swap should in therory give you more top end power. But its also said to have too much over lap and its not the best method. There are alot of write ups on zilvia I think about one guy who did alot of testing with all sorts of oem cams.

 

what you mean too much over lap,ya i also heard putting single cam pistons bumps yer compression up...

 

Overlap meaning both intake and exhuast valves are open.

 

my comments on 248/240 s13 cam swap: KA24E / KA24DE Forum: Nissan Forums / Infiniti Forums - NICOclub

Or for those who don't want to sign up to read it...

And I quote;

I've re-named this thread to something more searchable, as i feel there is a wealth of info here for cam swaps. all of the impressions here are based on a 92 s13 hatch, automatic, fully rebuilt to stock by me, except apexi panel filter I've tried 248/248, 240/248, 248/232, 240/240, and now I've tried 248/240

its been a while since i've tried any other cam swap besides 240/240, and i've never had 248/232 on the automatic car, but i did install it on a friends automatic, and it did net similar results to my manual car so i feel it's semi-fair to compare

248/248 is by far my least favorite cam swap. there is a noticeable loss in low end, and the motor never rev's high enough to take too much advantage of the additional top end power. I'm not saying the top end isn't there, it just really only starts pulling until right before 6000 rpm, and pulls to 7000. then you hit the rev limiter and crave for a few more revs. maybe an automatic ecu and 7200 rpm mighty be beneficial, but i love to rev it out and i shouldn't be allowed to have 200 more rpm. if i had a more top end oriented motor 248/248 would be a great thing to have, but until i can afford it, i wont ever use it again. the sound you get from this beast is nice though

240/248 is obviously stock, its been a while since ive actually had a car with 240/248. but from what i remember the low end is decent but it does fall on its face in the top end. the 248 exhaust cam is trying to make top end power, but the 240 intake cam is trying to provide more all-around power, not just low or top end. i don't like it because of how bad it falls on its face before even 6500

232/232 i never tried, but i got em so i could.... but come on 232/232?

240/240 has a really snappy low end, probably the best low end ive tried, and its the only times ive ever spun the tires into second gear in the automatic, granted its gotta be wet outside... anywho, 240/240 is what i'm directly comparing to 248/240 here. 240/240 has a nice pull even in the top end, and power is quite prominent in the 4000 rpm area. i'm still a big fan of 240/240 and i'd like to try it on my manual car, but that car already has the hands down best stock cam swap possible....

248/232 this is hand-down where its at. If you have some s13 cams and some s14 cams you should have already done this. the power production is great everywhere. you only lose a little bit of top end over 248/248 and you gain more low end than you get with any other swap besides maybe 232/232. the KA craves this swap, it loves the low end and, chances are you only rev to 6500 anyway, so that's why this is the cam swap for you. only don't do this if you wanna get beat by me. i'm only kidding, i'm too poor to be fast.
248/232 is the most worth doing is what i'm saying All you have to do to get a 248 to work is rotate it CCW 4 teeth, or two pots on the chain. its well known that a 248 on the intake side will be off by a certain amount of degrees, the actual amount escapes me, but it is significant, so i wanted to try as many combination's as possible to find the best set up without adjustable cam gears.

i'm actually liking 248/240 a lot better. 248/232 is still my favorite, and the butt dyno is also a huge fan of it too.


248/240 you read all that crap just to get to here so here it is. coming from 240/240 in a nearly stock automatic car, i'm very disappointed. the only major difference is a slight gain in top end, maybe 2hp, but the loss of low end is noticeable. i'd rather have that torque back for this daily driver than the slight bump i got in top end. granted this car is actually proven quicker now than the 240/240 car, but its less satisfying. everyone wants to be put into the back of their seat right away, not eventually....sound in 248/248 sounds the best, but 248/232 sounds 100% different, and also quite beautiful. idle with 248/240 sucks, but its nice because its honest looping so it give the illusion of a fast auto....


EDIT: okay this is the only swap i think i didnt touch yet, and you wont even hear about for many posts down. Some of the posts in this thread are kinda off topic, but MANY MANY are very useful, and there is a large discussion independent of this thread by tloof that you can search for...


240/232 this is what i just put in my automatic car. im a huge fan of the low end here, and its better than 240/240. the overlap is always off by about 2 degrees or so when you use an intake cam used as an exhaust cam or vice-versa. So for that reason, 240/232 works very nice. i can tell it doesnt have quite as much pull in the top end as 248/232 but its part-throttle driveability is great. you really only feel the low end torque when you are at part-throttle anyways, so you need ot make a decision....

240/232 is great for a dailydriver, where low end torque is favored over top end merging power. in the automatic, after shifts the car has noticably more power than it does with 248/232. I would say if you have an automatic get the 240/232 because you spend more time in the midrange becasue of your gearing.

248/232 is for the manuel car. ive gone to and from this cam swap in both cars at least five or six times, and i always come back. its the best there is, and its greater than stock. its ideal for forced induction, and its cheap to do. i can imagine this swap would be even more devestating with a redrilled cam gear.

248/248 is something im going to look at again with my current setup on the manuel car. (redrilled cam gear, intake manifold, SAFC, 3in exhaust, and dc sports header) it doesnt do any good in the auto, the loss in mid and low end isnt worth it. ive seen a dyno of 248/232 vs 248/248 and the difference in top end is something like 2hp, but the difference in midrange is 6 peak hp and all kinds of torque.....

 

so the 248/232is what you prefer but why would i wanna go smaller on the exhaust side lol i need all the exhaust flow i can get with this huge ass exhaust...
My car is 5-speed n has a hotshot header,intake,exhaust,auto ecu...i was told its a s14 swap but then read up that s14 ka's only have two vc bolts in the center n the s13 ones have 3

 

on the back of the valve cover there should be a bolt in the middle way back if it does its s14 if no s13

 

like on the very top of the valve cover right there's the 6lower then 3 upper bolts to pull off the valve cover=13 ka correct

 

actually reved it out today n watched the rpms it dies from like 4800-6 then 6 to 7200 pulled hard

 

i can only hope you've ruled out the typical tune up stuff. fuel filter, plugs, wires, cap, rotor, etc...
Get a timing light and set your spark time to the stock set up.
work on getting things back to stock and then go from there... something is telling me that the previous owner tried to do something he read about on the internet to make his super JDM tyte car go faster.

 

lol ya iv did all the tune up shit,just havent got aroudn to the timing yet