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help building a sleeper.

5.2K views 56 replies 16 participants last post by  brents240  
#1 ·
So I'm trying to do as many mods as I can w/ the car still appering stock. I don't want to spend over 500 on a mod because I don't know my future plans w/ this engine. I've put a k&n drop-in airfilter and cut the bottem of my airbox, and I switched to royal purple motor oil(if you havn't done this I highly suggest it) and I'm ordering the transmisson and rear-diff oil monday. I'm currently looking for the electric fans out of an altima and working on a custom cold-air-intake after doing a battery relocation. I.e. a 90 degree turn at the throttle body towards the gap the battery used to be in and the filter sitting inside the passenger finder. What other mods can I do that well give me some kind of gain in power with out being to noticable.
 
#3 ·
yeah but even if I got it in black would it be real noticable. what about gutting the cat or resinator, I know on my maxima this gave no real horse power gain but its a thought. once again I don't want something to loud at idea but I can deal w/ small increase in sound. on the gutted car I would prefer someone comment who knows someone who has done this or seen actual dynos, If someone asked me this question I'd say don't do it but as far as proof I havn't seen any.
 
#4 ·
free mods might get you 2hp total if you're lucky. RSR Exmag exhaust is super quiet, but it'll get you some gains and it's a black chambered muffler on the catback and looks almost stock. The crank pulley is not noticeable, you can't even see mine unless you're under the car. Short shifter you wouldn't be able to tell. Maybe even a Sneeky Pete nitrous kit.
 
#6 ·
Agreed. You're going to have to make up your mind about your future plans with the engine to make it a true sleeper. If you want the NA sleeper do what you said about the custom 2.5" exhaust and stock looking muffler. Get a hf cat or test pipe and a hs header. An ecu upgrade would be your best bet now. If you later planned on slappin a turbo on it'd be $100 bucks for a retune. JWT Cams could also be used in the turbo setup. Gotta make a decision some time. :eek: I had an injen intake, hs header, and 2.5" exhaust and when I went turbo it all went on my other 240.
 
#7 ·
most of the sleepers ive seen only look stock from the outside when you pull up next to them. im not sure why you would really care what it looks like under the hood no one will see it unless you go around bragging

but if its important to you maybe look into a light flywheel or some internals but those tend to get pricey removing sound deadening material inside is free
and nobody will notice it unless there inside the car
 
#8 ·
well I'm not going to dance around the fact that I'm a street racer and I don't paticularly want to discuss the marit of that. But I live in the small city of birmingham so most of the cars I run w/ run anywhere from 16.5 to 14.5 on the 1/4. before the oil I ran a 15.8 so I'm doin ok. I would like to lower my time as much as possible w/out the car looking heavily modified or spending thousends of dollars. I'm very seirously considering a wet NX kit but till then I'm working on other things. I've been think of an engine swap w/ ethier on RB or SR, I'm leaning more towards the RB because I'm primarily a drag racer, but still thinking of the easy of an SR, I've read alot about the whole altima intake cam and s13 exhaust cam thing. my question is would this help me out and how much trouble will this be. and what kind of money would I spen on a flywheel and aluminum driveshaft. I see no reason to buy a clutch for this engine as I won't be putting alot of power down w/ it. and what kind of down sides would there be to the drive train mods. oh and uno thanks for the exhaust tip I'll look into that.
 
#14 ·
4.63 gears where will I find this, did it come off a different year 240 and is this just a diffrent rear-end, I've had good luck w/ jim wolf on my maxima so I'll go check out there site. anyone ever heard of regrounding the MAF sensor. I read this in one of my old car magazines that nissans responded very well to this, but after having to replace the MAF sensor on my maxima I'm not to eager to try this w/out some feed back from someone who has tried this.
 
#15 ·
Hello Brent,
I think I met you at the 240sx meet over at Brandon`s house. I plan on installing a Turbo kit for the KA. The kit is under 2,000.00 and if you are interested we can hook up when I get the kit. I plan on getting the kit next week. You are more then welcome to come over when we do the install.
 
#17 ·
IC x Prince said:
cam regrinds. those are like 60 a piece from crower. at least it was last time i went there. jwt ecu too. that helped my friends NA truck alot.
From crower's website, good stuff.

2. Straight regrind- Reduced base circle allows more lobe lift. Limited spec, emphasis on top end power. Typical specs are .005" to .010" more lift, 5 to 10 degrees more duration at .050" and about 5-10 more hp depending on engine mods. $134.50 per cam for the grinding. You supply stock cores.
 
#18 ·
InsanityInc said:
I think a turbo would be kind of obvious. You know, since you can both see and hear it.
Yep it would be noticable if you get on it or open the hood. Turbo would give a lot more HP for the money. If you compare HP per money spent. Given you can get a Turbo kit for around 2k and go from 155hp to around 220hp an additional you 65HP. Would net you about 31bucks per 1HP with Turbo.
Now look at going non turbo lets go the route a lot of people go buy a exhaust system for 500bucks, headers for 300bucks and new air intake for another 200bucks. Total net HP maybe 15HP. Would net you about 67 bucks per 1HP without Turbo.
 
#19 ·
Dollar for dollar the cheapest hp gains can be found with giggle gas. But like turbo charging proper tuning is a must. Though a improperly tuned Nitro fed car melts down with a little less warning than a poorly tuned turbo car. The stuff is just plain cheap. I've never heard of anyone paying $2000 for a 50hp shot. And you could spend the rest of the cash to hide it away some where.

-Royce
 
#20 ·
Dogger said:
Dollar for dollar the cheapest hp gains can be found with giggle gas. But like turbo charging proper tuning is a must. Though a improperly tuned Nitro fed car melts down with a little less warning than a poorly tuned turbo car. The stuff is just plain cheap. I've never heard of anyone paying $2000 for a 50hp shot. And you could spend the rest of the cash to hide it away some where.

-Royce
I would bet on a good NOS kit would run around 1000bucks. Then you would have the fun of getting it filled everytime it ran out :)
 
#21 ·
Ok, a wet NX kit from a local speed shop, (integrity) that I have alot of respect for quoted me 1000 w/ install. I think I may do an engine swap I'm not really sure i've only owned the car for a few months. The reason I started this thread
1. because I street race and I'm trying to make my car noticibly faster than stock while still looking stock, money and pride killing just warms my heart.
2. for anyone looking to do the same or for anyone who is looking for cheap mods.
I don't mind spending money on the Ka to a certian extent. I very much appreciate every idea each of you has had and I want them to keep coming, I think this has become a very intresting thread and I know, for me atleast, it's been very helpful.
rseabrooke,
We havn't met I joined like two days after the meet and I really wish I haddn't missed it. Thank you for the invite on the turbo, I will very seriously think about it but as of right now I don't have the money, It would honestly be another two to three months before I can do such a big mod but I agree w/ you completely on the value nitrous, as much as I've consedered it, It's a fast way to throw away alot of cash and not a good perminit solution for speed. As for the invite on the install I would love to help I have very little experience w/ the 240 so I'd love to help and I'd love the chance to actually meet some of the other 240 owners in birmingham. Call me when you get ready to do the install at 205-746-1232, call me anytime if I don't answer i'll call you back.
Sohc pistons, What kind of gain can I expect from this. I under stand that rasing the copression ratio increases hp but I want to know how hard would this be for me and some of my fellow car friends to do, how much would this cost, would I have to use preimiem fuel for this mod, what other mods would I have to do w/ this, and finaly would any of you actually suggest this/ know someone who tried this.
4.63 gearing, where would I find this and what is the stock gearing, I drive on the interstate everyday so I don't need to redline at 80mph but this would be just the kind of thing I need so please some more feedback.
exhaust, what kinds of gains can I get from headers, what can I get from a test pipe, what can I get from rsr cat-back exhaust, If I can get a respectable gain from the rsr I would be very intrested in it, also dose anyone have a sound clip of this exhaust.
what kind of gains can i get on cams and should I get this mysterious altima intake and s13 exhaust cam and regrind them or is this just a myth of sorts.
what kind of gains would I get w/ a flywheel and driveshaft, how much would this cost and would this drasticly affect drivablity, oh and would I have to buy a new clutch and pressure plate or could I just get a flywheel.


thanks again for the help I'm starting to think very highly of this forum.
 
#23 ·
http://www.overboost.com/obs/product.asp?pid=5507
http://webhome.idirect.com/~trini/car/nos.html

Not sure if this is a good kit or not. Never claimed to like NOS over boost. But the man said he wanted to keep the cost down and keep it looking stock.
And as long as he doesnt go crazy a bottle of the stuff can last a while...and cost $20-$40 to keep filled. Granted both power adders have their draw backs, but when going by the guide lines of cheap and stock like appearance @least under the hood you have to tip the scales a little towards NOS' favor

-Royce
 
#25 ·
Iintake/headers/exhaust? is that right. Anyway intake- seen very easily w/ hood open and has a reputation for power not what we want, we want hiden intake, Headers-reputation for power, easily seen, must find a way to hide them however I was looking at the heat shielding and the heat shielding curves under the stock headers and all the aftermarkets would get in the way so I'd have to costomise it some how, Exhaust-loud not sleeper in anyway, the only way to pull this off would be w/ something like the rsr but I don't want to spend $500 would out some kind of dyno or testament to the power increase.

I know what I'm asking is both strange and in no way easy to answer but thats what makes it intristing and a good thread.
 
#26 ·
so we've come up w/ the following
1. Synthetic fluids i.e. engine, transmisson, diff oil
2. custom cold air like featured in the battery relocation kit and cutom intake thread
3. Electric fans i.e. altima fans or aftermarket
4. bored-out throttle body
5. pulley kit
6. RSR Exmag exhaust
7. short throw shifter
8. hidden nitrous kit (the big one)
9. Jim wolf tech, ecu
10.light weight engine internals
11.light weight flywheel
12.aluminum driveshaft
13.crower reground cams
14.Altima intake cam s13 exhaust cam???
15.headers hiden under heat shield
16.weight reduction, if it can't be seen i.e. tinted windows such
17.hi-flow cat/test pipe
18.higher comprestion pistons-sohc pistons/aftermarket forged
19.lower gearing
20.smaller diameter wheels, if traction premits
21.better tires, pray they don't notice
22.lightwieght aftermarket wheels, in hopes that they are seen just as aftermarket
23.lexan glass replacment, for the more daring
24.larger throttle body
25.maybe intake manifold
26.ground kit/ reground sensors/yet to be seen

Did I miss anything and what other Ideas do you guys have