How much power can this build safely/reliably make?

[nomoremrriceguy]

I'm looking to pick this 240sx in the next couple weeks and it's currently tuned at 330whp, my goal is around 370-400 ish can this build do it reliably and if not what would it need?

-cp Pistons
-eagle connecting rods
-Nissan main & rod bearings
-cosworth head gasket
-arp head studs
-Nissan oil pump
-arp head studs
-RPS clutch
-Nismo engine mount
-Greddy intake manifold
-Megan turbo elbow
-Garrett gt2871r .64ar
-nismo 740cc injectors
-tomei fpr
-tomei ras
-tomei Valve springs & retainers
-Tomei 256/256 pro cams
-apexi power fc stand alone
-blitz FMIC
-walboro 255 fuel pump
-Mishimoto radiator
-Circuit sport radiator hoses
-nismo tranny mount
-new oem water pump
-new oem starter

[KAT-PWR]

Might be able to do 400 with that turbo.

[nomoremrriceguy]

Might be able to do 400 with that turbo. internally can it handle that much power safely?

[KAT-PWR]

Depends on t00nage

[nomoremrriceguy]

Depends on t00nage haha, i know a bunch of gtr and subie tuners up here but not sr20/ka24 tuners

[Tyler_240]

but why...if those are your goals, I would sincerely suggest switching turbos...less boost and same power...if your goal was 350 all day, easily, then that would be a ideal setup...but if it were me, i'd keep the bottom mount and go external wastegate and Borg EFR 6758...or 3071R .64

just my 2cents..

[Tyler_240]

you may have spark issues when you get up in that HP range too. I didnt see any ignition system listed, and stock coils are weaksauce

[Kingtal0n]

that turbo is for stock engines. do not build an engine and use a 2871r turbo...

[SlideWell]

Ahh, the 2871R...it could hit 400, sure, but it's going to run better shooting for 350. At the end of it all, I'd be more concerned on the transmission holding up. My friend ran the same turbo, first tuned at 400, then went through 3 transmissions, brought it back down to 350...lost contact with him after that.

[nomoremrriceguy]

Ahh, the 2871R...it could hit 400, sure, but it's going to run better shooting for 350. At the end of it all, I'd be more concerned on the transmission holding up. My friend ran the same turbo, first tuned at 400, then went through 3 transmissions, brought it back down to 350...lost contact with him after that. what transmissions? If they kept breaking why didn't he just get a CD-009?

[R3b]

That my biggest issue at the moment. Spark and tranny options... Im built ka with 1000cc and precision .63. Handle well over 400 but busting trannies is my biggest fear.

[anti tyler]

I've heard of ka trannys holding 6-700rwhp but it's for how long.

I'd say about safely as far as TQ you could get away with maybe upwards. UPWARDS of 400 before you need to look at different shifting scenarios.

Remember HP doesn't kill the tranny the TORQUE on it does. don't chance grenade-ing and wrecking to push power

[jr_ss]

I blew an SR trans at 275wtrq. They are only rated to 250-300 from the factory. It's not a question of if, it's a question of when and it will go. I promise you that. A Cd009 is a good option, so is the Z32 5spd, if you can find one in good condition. Otherwise think of rebuilding it. Mine cost $700ish to rebuild. At that price point you're better off finding a low mileage cd.

You'll be lucky to hit the 400whp mark with that setup, especially those cams.

[tuzzio]

using a stock shifter significantly improves the life of your trans.

[derass]

I don't think any shifter will prevent shearing the teeth off 3rd gear.

[STR8 H8N]

https://i.ytimg.com/vi/COfwoMJek0Y/maxresdefault.jpg

[nomoremrriceguy]

I blew an SR trans at 275wtrq. They are only rated to 250-300 from the factory. It's not a question of if, it's a question of when and it will go. I promise you that. A Cd009 is a good option, so is the Z32 5spd, if you can find one in good condition. Otherwise think of rebuilding it. Mine cost $700ish to rebuild. At that price point you're better off finding a low mileage cd.

You'll be lucky to hit the 400whp mark with that setup, especially those cams. whats wrong with the cams?

[derass]

They're too small. Most people making 400whp are using 260's.

[nomoremrriceguy]

They're too small. Most people making 400whp are using 260's. this build in general though should.make 400 whp reliably shouldnt it?

[R3b]

Yes, but if you want reliability I suggest getting a machine shop to do all they can. Go aftermarket bearings, get a line hone for arp main studs and not OEM bolts, get them to machine all the bearings to proper clearances, balance the crank and clutch, hot tank the block, resurface the head/block and make sure you do your covers with it as well.

You will be perfect for 400 and if you choose to change turbo/fuel/tranny you can hit well over 500-550 depending on whos tuning it but 400 is a sweet range in a schassis street car. I would also recommend running e85, 1000cc will get you to 400. Your turbo should be fine for that, 20psi on gt2871r will get you there no problem just need to ran external wastegate. Theyre good for 17 to just over 20psi

I wish I would of went bottom mount ball bearing. Getting 15psi before 4k is beauitful. On my precision 63 I get only really build boost just before 4k lol. I want to go bb gt30 or just go BW with a massive t4 if I want to shoot past my 400whp goal on the precision.

[nomoremrriceguy]

Yes, but if you want reliability I suggest getting a machine shop to do all they can. Go aftermarket bearings, get a line hone for arp main studs and not OEM bolts, get them to machine all the bearings to proper clearances, balance the crank and clutch, hot tank the block, resurface the head/block and make sure you do your covers with it as well.

You will be perfect for 400 and if you choose to change turbo/fuel/tranny you can hit well over 500-550 depending on whos tuning it but 400 is a sweet range in a schassis street car. I would also recommend running e85, 1000cc will get you to 400. Your turbo should be fine for that, 20psi on gt2871r will get you there no problem just need to ran external wastegate. Theyre good for 17 to just over 20psi

I wish I would of went bottom mount ball bearing. Getting 15psi before 4k is beauitful. On my precision 63 I get only really build boost just before 4k lol. I want to go bb gt30 or just go BW with a massive t4 if I want to shoot past my 400whp goal on the precision. got it, thanks for the info, so having that said what can this reliably make as it sits? 350 ish?

[derass]

If there were bigger cams, that setup should make 400whp.

Reliably is another question. I see it has forged pistons and rods. 9/10 times "built" motors fail well before a stock engine would. They're just not assembled with the same precision.

That's why 400hp and under a stock block is best. Over 400hp, you build the thing to prevent blowing a hole in the piston immediately and pray that you get a few years/couple thousand miles out of the engine.

[R3b]

Yeah you will make it to 350 easy, in all honesty. Keep your power your are at now, baby the car use the money you would to build the motor and go jz. You say youre at 330, why build the motor if you will get an extra 20hp or even 70hp. If you have building in in mind then go for 400+ if not do a swap. I kinda regret building and not swapping. If you want 350ish on a built motor just keep your stock one and switch to e85 and the gt2871r for better spool.

Like derass said just stay stock with really good tune. If you want 400-500 then swap to another motor set and spend the extra cash than build the motor. Knowing what I spent on my ka build I should have gone stock 2jz with cd009. Then later add AC, and when more funds come in go single turbo, injectors, and standalone for 450-500 all day reliably on pump then 500+ on e85.

[nomoremrriceguy]

Yeah you will make it to 350 easy, in all honesty. Keep your power your are at now, baby the car use the money you would to build the motor and go jz. You say youre at 330, why build the motor if you will get an extra 20hp or even 70hp. If you have building in in mind then go for 400+ if not do a swap. I kinda regret building and not swapping. If you want 350ish on a built motor just keep your stock one and switch to e85 and the gt2871r for better spool.

Like derass said just stay stock with really good tune. If you want 400-500 then swap to another motor set and spend the extra cash than build the motor. Knowing what I spent on my ka build I should have gone stock 2jz with cd009. Then later add AC, and when more funds come in go single turbo, injectors, and standalone for 450-500 all day reliably on pump then 500+ on e85. speaking of 2j, if i dont buy this car my other thought is having another user on here who runs a shop, get a rolling chassis and put a 2j in it, better turbo and cd 009 and fuel system so i can have around 500 wheel and itd be super reliable

[jr_ss]

this build in general though should.make 400 whp reliably shouldnt it?

Codyace had a cookie cutter 2871R build that made 400reliably and drove it like that for years. Even tracked it as such. He used JWS3 cams and those are into the 270duration specs. 256 cams are good for low/mid range but they'll run out of head room.

It COULD make 400whp, but most likely it'll be mid to high 300's.

[nomoremrriceguy]

so lets say I wanted to make 400 whp reliably with this build, what would I need to change? From what you guys have said it sounds like the cams need to be up'd to 260-270 area and the transmission ideally should be a CD 009, it currently has the stock s15 sr20 tranny