Question about an engine swap

I was doing some research because I am planning on getting a S-14 style 240sx sometime in the not so distant future. Upon doing some research I have decided that I will probably go with the S15 Silvia SR20DET.

http://www.enginelandinc.com/show.asp?cn=&ck=203&pk=56&categorykey=81.

I was wondering much horsepower would I be able to run on the stock internals with this particular motor. Any help would be appricated.

You should be able to run around 400hp to the fly depending on mileage and condition of the motor...after that stock internals will not be happy

tranny internals wont be happy too

i heard there all the gears are cramed together and arnt very strong. i would beef up those if i were you or get the s14 or s13 sr instead

It's true that the SR 6speed tranny is weaker then the 5speed, but they still hold 400whp in D1 cars and they are beaten to fucking death, unless your making a dyno queen, the tranny will hold fine. You can make 350whp on stock internals, but always make sure there is enough fuel. Also you need the rear end with that engine cause the speed sensor is in the differential.

shorter drive shaft too right?

It comes with the 6 speed tranny already. I will eventually make it a dyno queen. Want something more for the track that the street because I will still have my eclipse to be a daily driver. But it will be a while before i'll have it at that stage. Another question though. If I end up getting a 240 that is a auto (seems like they are usually the cheaper ones) as long as I have the manual tranny would it be hard to convert it to a stick.

i would go more towards the S13 or S14, why have you chose the S15 SR? You can save money by buying an S13 or S14 SR and use that money for mods and still have the same power. The S14 SR is about 220hp?, and the S15 SR is 250hp, not a great difference, and you'll pay alot more and the swap is harder...

I would say go with a black top s13...lower miles. strong internals, 5 speed tranny holds more whp. dont need to swap rear end. and it also doesnt have vvt, which makes tuning the thing a bitch...so all in all you would save aprox $2,000 on the motor alone, that could be used for a bigger turbo, and internal work. ;) good luck

VTC only complicates tuning if your going for really high hp, he's not doing that now so it doesn't matter, same with tranny. And I know it comes with the 6speed, buddy, Im saying you have to swap the rear end (driveshaft, differential, half shafts, i think), there is a rear end on these cars, not like your Eclipse. :-P btw, the stock S15 driveshaft fits.

well he orignally said that the car will be a dyno queen...thus in the future he will have problems with tuning...just saving him the frustration he will have later.

if he actually wants a dyno queen then i have lost all respect for him and refuse to answer any other questions that he has, unless it's to explain to him how gay dyno queens are.

Maybe he just wants to set a record for highest HP 240...but yeah, im not a fan of dyno queens either.."ive got 800hp, and fool boost at 7000rpm" (not literally, but you get what im saying, boring)

i'm not a fan of tom cruise

wrong thread eh?

no you are all in the wrong thread im in the right thread

Hey, I always wanted to do an S15 swap, but the money prevented me. the six-speeds are stronger than most people think, and the internals are strong enough for any decent car (track or drift) VTC, though it is cool (but a pain), can be deleted/disabled.

there is a rear end on these cars, not like your Eclipse. :-P btw, the stock S15 driveshaft fits.

This I already realized.

I would say go with a black top s13...lower miles. strong internals, 5 speed tranny holds more whp. dont need to swap rear end. and it also doesnt have vvt, which makes tuning the thing a bitch...so all in all you would save aprox $2,000 on the motor alone, that could be used for a bigger turbo, and internal work. ;) good luck

Ok yeah that actually sounds like a better option. What is the difference between the s13 black top and the s13 red top if any. On paper they pretty much seemed the same to me. Is there any real difference between the 2.

if he actually wants a dyno queen then i have lost all respect for him and refuse to answer any other questions that he has, unless it's to explain to him how gay dyno queens are.

I don't necessarily want the car to be strickly a dyno car to see how much horsepower I can get out of it. Mainly I want to make it into something that has a pretty good amount of power (around 450-500rwhp) that I can take to my local drag strip and race, however I do want it to look nice and to be street legal. So probably more of a fast show car since I would be parking in it the fall and winter months.

s13 redtop was older and had weaker internals i believe 54J or something the ones you want that are stronger in the s13 blacktop on are 54C (i think i got the C and J right someone plz correct me if im wrong) but the numbers you are shooting for are right at the brink for even the stronger ones so if you are going to do internals it wont matter.

Ok so on the S13 Black Top how much horsepower can I expect to run on stock internals.

umm over 400 but i dont remember by how much.. lemme see if i can find out.

it's 400 avg depending on mileage, condition etc

So what would be the biggest turbo that I could use on the stock internals???

what do you mean "biggest"? Do you know anything about turbochargers? Thats a very broad question and could mean a lot of things.

I don't see how it is that hard of a question. On the stock internals what is the biggest turbo the motor can handle safetly without blowing it up. I understand the concept of the turbo. What I don't understand is your question.

You are clueless to what a turbo is, the different sizes of the different parts of a turbo and yoyur question is just stupid, no wonder you have no performance mods on your Eclipse. (If you say your CF exhaust is a performance mod......god help us...)

I don't see how it is that hard of a question. On the stock internals what is the biggest turbo the motor can handle safetly without blowing it up. I understand the concept of the turbo. What I don't understand is your question.

I never said it was hard, i said it was broad. Meaning it covers a large field of questions that can be more defined. And you must not know very much of anything of turbochargers to ask that question. If you do, give me the specs on the largest turbo you would go with. And i dont want to start this into a flame war, but you probably going to get harsh education if you cant even understand my question, yet you ask about turbochargers that are much more complex. Understand?

largest turbo you can run = the largest one you can fit under your hood.

you just cant run it in anywhere near its efficiency range.

mabye he means largest output, in that case there are many turbos you can use because you can just limit the boost etc and just have it make around 400ps, of course itd be dumb to get a huge turbo and do that, you need to get one that will fit what kinda of racing/driving you plan to do etc...whatever conditions it must meet...

You are clueless to what a turbo is, the different sizes of the different parts of a turbo and yoyur question is just stupid, no wonder you have no performance mods on your Eclipse. (If you say your CF exhaust is a performance mod......god help us...)

No I don't consider a fart can a performance mod it was on the car when I bought it. Have a Greddy Evo 2 Catback order for it I am just waiting for it to come in. No I am not clueluss to what a turbo is. Now granted I do not know alot about turbos but I do know the basic concept of what a turbo does. What turbo comes stock with the S13 Blacktop SR20det. I guess what I should be asking is how many PSI of boost can the stock internals handle.

the s13 black top comes with a t25g garret turbo, which some people boost to 15psi max, but id say keep it at around 11...or .8 bar or whatever
The amount of psi you can run depends on the your fuel setup, which includes inj, pump and what kinda of fuel you are running. It also depends on the conpression ratio etc...

Hey, I always wanted to do an S15 swap, but the money prevented me. the six-speeds are stronger than most people think, and the internals are strong enough for any decent car (track or drift) VTC, though it is cool (but a pain), can be deleted/disabled.

stronger but still weaker than 5 speed.

vtc=not cool

how would you delete vtc?
(this oughta be good)

so basically the only reason to get the newer long block is the VTC, which you wont want anyways if your going for max power.
also, the s15 transmission, while strong, is not as strong as the 5 speeds. which matters when going for max power. so tell me why again you would even want an s15 motor? actually the high port head on the s13 motors are said to have higher hp potential.

s15 swap would only make sense if that extra 6th gear is REALLY needed, or your gonna leave the motor stock no matter which one you swap.

just to help you out on your turbo question, since everyone else is saying ooo theres a bunch of viables...and theres not really...with 100% stock internals you can look at around 360-380 whp, with a .86 a/r gt2871r turbo which has good spool times (close to stock) or you can go with a garret T3/t04e turbo, which will net around the same #'s (this turbo needs a new manifold to run the t3 flange turbo...duh) the 2871r is t25 flange based therefore mostly bolt-on. of course you will need to run diffrent intercooler piping/ diffrent oil lines. (taka lines). anywho...hopefully this helps you alittle bit.

just to help you out on your turbo question, since everyone else is saying ooo theres a bunch of viables...and theres not really...with 100% stock internals you can look at around 360-380 whp, with a .86 a/r gt2871r turbo which has good spool times (close to stock) or you can go with a garret T3/t04e turbo, which will net around the same #'s (this turbo needs a new manifold to run the t3 flange turbo...duh) the 2871r is t25 flange based therefore mostly bolt-on. of course you will need to run diffrent intercooler piping/ diffrent oil lines. (taka lines). anywho...hopefully this helps you alittle bit.

Cool thank you that is exactly what I was wanting to know.

Actually the S15 SR has a higher compression ratio so the S13 will be able to handle higher boost on stock internals.

And if I recall correctly the VTC can be removed by installing non VTC cams and cam gears and changing the ECU.

just to help you out on your turbo question, since everyone else is saying ooo theres a bunch of viables...and theres not really...with 100% stock internals you can look at around 360-380 whp, with a .86 a/r gt2871r turbo which has good spool times (close to stock) or you can go with a garret T3/t04e turbo, which will net around the same #'s (this turbo needs a new manifold to run the t3 flange turbo...duh) the 2871r is t25 flange based therefore mostly bolt-on. of course you will need to run diffrent intercooler piping/ diffrent oil lines. (taka lines). anywho...hopefully this helps you alittle bit.

Well lets say he said "i want to just make big dyno numbers to be cool in superstreet." Then i would have recommended a high A/R turbine, but if he was like i want to make lots of power on the street i would have said to get a moderate A/R turbine with a trim around 10% of what the A/R. He should have just asked how many lbs of boost the stock T25 S13 SR can take. And just a reminder that 20psi on a T25, is like 9psi on a TO4 (not literally but you get the concept.)....hope that helps a bit

Well lets say he said "i want to just make big dyno numbers to be cool in superstreet." Then i would have recommended a high A/R turbine, but if he was like i want to make lots of power on the street i would have said to get a moderate A/R turbine with a trim around 10% of what the A/R. He should have just asked how many lbs of boost the stock T25 S13 SR can take. And just a reminder that 20psi on a T25, is like 9psi on a TO4 (not literally but you get the concept.)....hope that helps a bit


If you would have read all my post I pretty much stated what I wanted out of the car and I actually did ask how much boost the stock internals could take. Anyways thanks for the chart.

no, your original question was how much horespower you could get out of the SR, not how much boost it can handle. If you were asking about boost i would have simply said they are said to be able to take about 28psi, but the blocks have warped in the past from people doing only 25/26. The stock turbo wont even handle that much boost though...

He just changes his question at every post!