project n/a 240sx

[Onizuka]

I was in the same position with my current hatchback project, ended up just getting a s14 sr20de. 165hp stock, about 100lbs lighter and way easier to install than making custom ITBs. Killing two birds with one stone in my book (pretty cheap too). But dont let that stop you, I'm all for custom ITB's

[LovesBigTurbos]

what about pistons/rods? didn't see anyone say that I could be wrong though.

[sommmatt]

N/A KA huh. For a DOHC...

Port and Polished Head with 3 angle valve job.Oversize valves.Titanium Valve SpringsCrower CamsITBs. 4-1 Header. Forged SOHC Pistons Lightweight Forged RodsReal CAI2.25 inch straight pipe exhaustLightweight flywheel1 piece driveshaftGood tune

A setup like this will give you huge compression, a head that might flow decently enough to give you power up top, a good breathing exhaust, a good breathing intake, and fast revving with minimal vibration. The forged internals are to keep weight down.

[ztunelover]

does the sr20de s14 model have the vvt thingie? and how much are they to install. sure they would make some crazy power n/a cuz thats what tomei sr20s ran in the n2 series. i dunno lets see. i do plan to eventually built it. i might just buy a s13 hatch rolling chassis.

[ztunelover]

i think i have an exhaust thats too big. i was originally planning big sr turbo power so i have hks 85mm hi power. im pretty sure thats a bit too big for n/a power.

[White Comet]

N/A KA huh. For a DOHC...

Port and Polished Head with 3 angle valve job.Oversize valves.Titanium Valve SpringsCrower CamsITBs. 4-1 Header. Forged SOHC Pistons Lightweight Forged RodsReal CAI2.25 inch straight pipe exhaustLightweight flywheel1 piece driveshaftGood tune

A setup like this will give you huge compression, a head that might flow decently enough to give you power up top, a good breathing exhaust, a good breathing intake, and fast revving with minimal vibration. The forged internals are to keep weight down.

that setup or similar, has given many member on here a blown engine

[hbpignosePA]

dont quote me but i thought vvt was only on the 98+ sr20de's

idk where i think i read that.

i plan on doing an N/A SR build... i can actually get some good MPGs and a engine that has a fairly large aftermarket

[ca18detgabby]

the z32 uprights are 16 pounds lighter the coils if i go jic would be roughly 5 pounds each front 3 pounds each back. the entire nismo suspension link is about 10-12 lbs lighter. the rims would be lighter for sure, the driveshaft is cf so im positive that thing would be a featherweight. how much does the stock 2 piece weigh anyways? 20lbs? cuz i know the cf units are 8 or 9lbs. unsprung weight really helps around turns.

and after all of that is said and done..........

2kish? maybe a bit less........

you maybe have stripped off .2 hundreths of a second. Most of that 2 hundreths being gains in areo and power to the ground.

on average 100 pounds will save you .1 second........

I got to wonder, why even send 12 dollars on a KA if you have a RB you are planning for later and dont have millions of dollars to spend? NA KA is extremely expensive to do RIGHT.

If it were me I would rather spend all the money on the RB and be done with it.

[ztunelover]

the reason i believe is clear. the motor even fully built would cost me less than 8 grand. the rb26dett would cost me over 60grand possibly over 70 grand to build. and then theres the r32 chassis, aero prep and everything. i highly doubt a 60k motor is the est motor to practice on. a ka is pretty damn cheap, easily available has some aftermarket support. and im doing the ITB's because i want to practice before i start tuning the rb unit.

just out of curiosity would you rather practice on the 60 grand motor or the 1 grand motor. and i mean 1 grand by a vast overestimate(ka motors are much cheaper here), whereas the 60 just might be less than the actual cost.

and the uprights alone would knock 0.1 off the 60ft time. thats the difference between unsprung weight, and normal. thats why a lighter powertrains suspension system would do more than removing the back seat etc. and the lightened body materials focus on the upper part of the car = lower cog. if one thing matters less to me than anything its the quarter mile time. a lap time on the other hand is very important. and trust me lighter stuff there helps.

[Onizuka]

does the sr20de s14 model have the vvt thingie? and how much are they to install. sure they would make some crazy power n/a cuz thats what tomei sr20s ran in the n2 series. i dunno lets see. i do plan to eventually built it. i might just buy a s13 hatch rolling chassis.

All s14/s15 sr20de's have variable valve timing on the intake cam. If the wiring is done right you can keep the VVT, aircon, etc...

200hp is very doable with the n/a sr20, heck it was factory available in the Autech S15 silvia. But if you want a good combo of gas mileage, performance, weight savings, etc, at a lower cost, a stock s14/s15 sr20de aint bad.

Really though, its just as fun going through the process of building a ka24. As long as you're enjoying your hobby, it doesn't matter what route you take. Better to have fun and accept your car isnt a rocket, than get butt hurt after your $10,000 turbo setup gets spanked by a redneck in a camaro.

[ztunelover]

ill look into the sr20de as well i know tomei has a huge part load of stuff for it. but i think ill save that for a rolling chassis later. ill use these cars as test mule. to hone my tuning, get suspension setup data at the tracks, neither of the two(granted i get a rolling chassis) would be out there to break any records, they are for recon i guess, test mules if you will, i am investing huge money and many many many hours into the gtr, so that is hopefully going to break a record or two.

and outta curiousity how much is a sr20de, none of the local shops have one can someone send me a link o a company that does?

[hbpignosePA]

All s14/s15 sr20de's have variable valve timing on the intake cam. If the wiring is done right you can keep the VVT, aircon, etc...

your semi local to me... where did you get your n/a sr?

i know jhot gets em from time to time. with VVT can you still change out cams that are designed for the turbo versions?

i was thinking of doing a built head and raise compression using an approprate headgasket thinkness (i think thinner raises it)

[ztunelover]

thinner gaskets raises it. i would personally keep the vvt give it build internals and have it sing at 8000+revs through tomei ITBs as well. because with the vvt at least i can retain some low end torque.

yes you can swap em for the s14 or s15 cams. dont quote me but im fairly sure you can use tomei 256 duration poncams and use vvt too. but why would you do that? the turbo cams have less overlap, you would have some torque issues.

[ca18detgabby]

the reason i believe is clear. the motor even fully built would cost me less than 8 grand. the rb26dett would cost me over 60grand possibly over 70 grand to build. and then theres the r32 chassis, aero prep and everything. i highly doubt a 60k motor is the est motor to practice on. a ka is pretty damn cheap, easily available has some aftermarket support. and im doing the ITB's because i want to practice before i start tuning the rb unit.

just out of curiosity would you rather practice on the 60 grand motor or the 1 grand motor. and i mean 1 grand by a vast overestimate(ka motors are much cheaper here), whereas the 60 just might be less than the actual cost.

and the uprights alone would knock 0.1 off the 60ft time. thats the difference between unsprung weight, and normal. thats why a lighter powertrains suspension system would do more than removing the back seat etc. and the lightened body materials focus on the upper part of the car = lower cog. if one thing matters less to me than anything its the quarter mile time. a lap time on the other hand is very important. and trust me lighter stuff there helps.

I think I would rather be 8k closer to having a Running RB......... it would take a ton of f***ing up to screw up 8k worth of errors.

I have enough faith in myself, that I would work on the RB instead of toying with a small ball KA.

btw, if you really want to KA with RB experience........ do ITBS and boost it. would def be a cool build and still very much in a 8k budget and make some serious power.

[ztunelover]

8k is my upper limit, i intend not to hit it. 1k ITB, 1K built motor, 400-500bucks valvetrain. 1.5 grand for exhaust system and my ghetto cai that was originally a aem short ram, supporting fuel mods 500 bucks. nistune another 500 its still have 6k only. funny you should mention a 8k running rb

http://www.403drift.com/produc...D=653

9.5k for the rb.

and no i have higher plans for the 32 than the average gtr so just an average running gtr wont do for long. i have to make sure my rb can run 4 digit numbers without sending pistons flying everywhere.

and i can understand if you do. but this 240 is my first car. and by the time the r32 sees daylight again im positive that i would have enough experience to trust myself to build any car.

[Onizuka]

your semi local to me... where did you get your n/a sr?

i know jhot gets em from time to time. with VVT can you still change out cams that are designed for the turbo versions?

i was thinking of doing a built head and raise compression using an approprate headgasket thinkness (i think thinner raises it)

There are a few engine importers that operate around Newark NJ because its a huge port for the east coast. I got mine from JDM Engine Zone, 90-day warranty and I got to inspect everything first. I found another too at a place not far from that shop. Both places said its not a regular stock item. If you're paying more than $1000 for a s14 sr20de, you're paying too much.

I would assume as long as your swapping s14 cams for s14 cams, the heads are exactly the same.

Thinner gasket definitely raises compression. What were you going to do with the head?

[ca18detgabby]

8k is my upper limit, i intend not to hit it. 1k ITB, 1K built motor, 400-500bucks valvetrain. 1.5 grand for exhaust system and my ghetto cai that was originally a aem short ram, supporting fuel mods 500 bucks. nistune another 500 its still have 6k only. funny you should mention a 8k running rb

http://www.403drift.com/produc...D=653

9.5k for the rb.

and no i have higher plans for the 32 than the average gtr so just an average running gtr wont do for long. i have to make sure my rb can run 4 digit numbers without sending pistons flying everywhere.

and i can understand if you do. but this 240 is my first car. and by the time the r32 sees daylight again im positive that i would have enough experience to trust myself to build any car.

I didnt say anything about spending just 8k on an rb

[ztunelover]

u said you would much rather spend 8k and have a working rb. that motor stock is more.

[ztunelover]

ok all stupiness aside. i have a question for anyone that can answer it.

how thick is the stock headgasket of the ka24de?

I am also looking at swain tech coatings on stock ka cast pistons and rings and valve faces, because from what i gathered cast pistons are better road going pistons and is easier on the cylinder walls and since im not boosting i see no need to go crazy for a set of forged units. and i think the factory casts can handle a little bump in compression.

mind you im going to be using eagle rods.

[ztunelover]

ok i finally got the baseline run done, and numbers are finally up. Vid should be posted at some time, 2 passes on the dyno, I got ok numbers.

First run 123.41whp at 5300ish rpm, and 139.22lb.ft@4300ish rpmSecond run 126.46whp at 5300ish rpm, and 142.25lb.ft@4300ish rpm

Engine is running pig rich lol, i think the peak afr is 13.0:1 or 12.9:1, and averages around 11.8:1

Dyno run was done on a dynojet. so lets see what the exhausts, and flywheel and clutch mods do. I have a class in june so no updates before early to mid july.

Oh and what hp range should i bump up to sr 370cc injectors? Project N/A is finally started on its way wish me luck guys.