RB25DET Boost limits???

[younghatchowner]

hay everyone again...im thinking of the rb25 swap i havent all planned out and should be purchasing it soon..im thinking of running 10 lbs on the rb and i was gonna see if anyone could tell me if im taking a risk for reliability on 10lbs...will the head gasket give out....truthfully can i leave the headgasket alone or does it need to be replaced..

[Om1kron]

I think you should not be changing the engine at all if you have no idea what you're getting into.

[S13 curtis]

hay everyone again...im thinking of the rb25 swap i havent all planned out and should be purchasing it soon..im thinking of running 10 lbs on the rb and i was gonna see if anyone could tell me if im taking a rish for reliability on 10lbs...will the head gasket give out....truthfully can i leave the headgasket alone or does it need to be replaced..

it will def take 10psi, while your at it why not just do 30.

[fliprayzin240sx]

If youre just thinking of buying an RB25 and havent planned out shit, last thing you need is figuring out if you can crank it up to 10 psi...

[younghatchowner]

this is weird..i asked for help but im getting criticism..wtf....let me simplify the question...

While the motor is out should I get the headgasket changed or will it hold..10-12 lbs..if anything just stock boost..just getting an idea damn

[Lev]

Yes you should change the headgasket, and while the head is off check the cylinder walls to make sure your engine is not junk before you even think about turning the boost up. Also while you're doing that, also get ARP head studs because they will make life much easier for you later when you do turn the boost up too high and blow the headgasket :)

[younghatchowner]

thanks^^^^^^

[eh?]

No you do not need to change the HG for only 12psi. If you do change it just use another oem gasket.
Do not use an mls gasket now unless you are willing to deck the block.

[chituntang]

The reason people are flaming at you is because the answers to your question are all over the internet. A simple google will give you so many answers for your question.

But you ask if a RB25DET can take 10psi boost stock? A really stupid question IMO. If most, if not all NA blocks can take like 8psi of boost, how come a RB cannot take 10psi?

Think people, think...

[Lev]

The reason he should change it is because the one on there is old, has probably been abused and with the engine out of the car it's easy. It's just a matter of preventative maintenance.

[younghatchowner]

The reason people are flaming at you is because the answers to your question are all over the internet. A simple google will give you so many answers for your question.

But you ask if a RB25DET can take 10psi boost stock? A really stupid question IMO. If most, if not all NA blocks can take like 8psi of boost, how come a RB cannot take 10psi?

Think people, think...

welll check this i really dont wanna turn boost up and having it spoon fed its easier..thanks for the help sorry it took soooooooooooo much

[S13 curtis]

lol.........

[greenzenki86]

ive debated this route a few times, yes it can do 10psi, it can do a bit more but one of the draw backs is the stock turbo has a ceramic wheel and you will have turbo failure with doing 14psi consitently. NOW if you upgrade the turbo maybe GT35R etc.....you can go way past that. just keep in mind that with more boost, comes more money, bigger injectors, intercooler, and a nice tuning software etc. hope this helps.

[fliprayzin240sx]

Shit, do the basic maintenance on it first before you change the HG. Stock HG is pretty stout, you'd blow your stock turbo first before you blow the HG or run out of fuel (after you upgrade the fuel pump).

Spend your money on a new timing belt, N1 oil and water pump before even worrying about the HG. I've seen enough folks run stock HG, upgrade to a T3/T4 turbo, tune, 550cc injectors and make 450hp with no problem.

[Ghost240]

Do the research, and an Rb swap isn't something to walk into. If you don't know your shit it can get expensive fast. And it will handle the stock turbo all day with out a problem unless you got a shitty RB. Hell some guys was running 9s in his Rb25DET before it blew up

[jzepol1985]

lol............

[DALAZ_68]

bro...the RB25 can take 20 PSI stock form...just gets u a compression test yo...

[drift freaq]

wow this thread has much fail in it.

Plain and simple a stock RB25DET imported from Japan will have a perfectly fine headgasket. These are RB25DET's people they come out of Gloria's and R33 GTST not exactly top of the line performance models. Most are not beat on that hard and usually have pretty damn low mileage.
Now as far as boost goes yes a Stock RB25DET can handle 11-12lbs of boost all day long. Even higher if you change the turbo. The stock turbo is ceramic coated impeller wheels and they do come apart above 12lbs of boost.
I ran mine with a GT2530 at 11lbs and was turning out 300whp. Now like others have said to the OP.
There are many things to think about when doing a RB swap and how high it will boost is the least of your worries.
Have you figured out how your going to keep it cool? Have you decided on a swap kit? Have you set aside enough money to do the swap with the kit and extras? Plus extra cash for unexpected stuff?
You are looking at anywhere from 4-5k and up depending on how much work you do yourself.

[grudge]

yes it will handle. now just go buy the motor and have fun.

[BMXer91331]

40 psi for the win!!!!!!!!!!!

[onlydrinkkoolaid]

this is weird..i asked for help but im getting criticism..wtf....let me simplify the question...

While the motor is out should I get the headgasket changed or will it hold..10-12 lbs..if anything just stock boost..just getting an idea damn


Its always criticism and complaining it makes me wonder why even bother ask questions on Zilvia

but since you asked im pretty sure you can be safe with 25psi... I wouldnt walk to the cliff and dare the wind to blow so you shouldnt walk past 25psi and dear the RB25 not to blow... and yes someone will probably say oh I know this guy who been running 1000psi yes I mean 1000psi on a gt1000 turbo and his didnt blow up but its always better to be safe just my input....

[younghatchowner]

sorry for not replying..well im already getting

oil pump..water pump..zerolift driveshaft and mount kit..timing kit w tensioner/belt..headgasket set...arp main studs..acl bearings..fmic..spec stage 2..front and rear main seals..crankshaft seal..and the rb25swap itself and its running me just under $4000 thats without about 200-250 machine shop cost..and a down pipe...im hoping i get a job soon so i can start working and makesome more money so i dont have to stretch every dollar i got lol

Orlandoforums.com can kiss my ass..this build will be sick and i dont give a damn what people thing

anyways..with this slight rebuild going on and all the parts on stock turbo..reliability is my main thing here..but i would like to make so ok power..maybe somewhere around 300 reliably..250 is fine but it would be nice to have a few more hp..anyone know where i should be at power wise..how much boost i should run..a good turbo to try out(that wont break the bank..

[Triperformance]

Heres a word of the wise, After doing a friend and I....you have other things to worry about before you think about boost. Start with maintanance and get your car running solid. Also make sure your ecu wasnt flashed in any way.....in other words get a wideband and something to tune with (I got safc neo). My ecu was flashed for bigger injectors meaning the whole board other then easy driving was leaned out like crazy. Spend the money in getting it well maintained and double check your odds and ends as well. Best of luck in your swap and get someone who knows their &^%$ lol.

[eh?]

sorry for not replying..well im already getting

oil pump..water pump..zerolift driveshaft and mount kit..timing kit w tensioner/belt..headgasket set...arp main studs..acl bearings..fmic..spec stage 2..front and rear main seals..crankshaft seal..and the rb25swap itself and its running me just under $4000 thats without about 200-250 machine shop cost..and a down pipe...im hoping i get a job soon so i can start working and makesome more money so i dont have to stretch every dollar i got lol

Orlandoforums.com can kiss my ass..this build will be sick and i dont give a damn what people thing

anyways..with this slight rebuild going on and all the parts on stock turbo..reliability is my main thing here..but i would like to make so ok power..maybe somewhere around 300 reliably..250 is fine but it would be nice to have a few more hp..anyone know where i should be at power wise..how much boost i should run..a good turbo to try out(that wont break the bank..

Listen to people who have done the swap. You do not need to do the HG, Bearings, studs or oil pump now. Just do all the timing components and water pump. If you do the oil pump get the crank collar done FIRST.

300whp is weak, why do you think you need to do all those things to make it reliable? Never buy a motor if you feel you need to redo the bearings and oil pump asap. It's been trashed. Get your swap running THEN rebuild the engine. Why? Because so many rb swaps have problems running right and people just give up on them.

[DJDANGER24]

boost that shit to 15lbs, thats what im at right now and pulls HARD! been boosting that for about 3 years now, but i dont care if my turbo blows since i am upgrading here soon enough. regardless, it pulls good. spikes to 15, drops to 13.5lbs.

[Triperformance]

boost that shit to 15lbs, thats what im at right now and pulls HARD! been boosting that for about 3 years now, but i dont care if my turbo blows since i am upgrading here soon enough. regardless, it pulls good. spikes to 15, drops to 13.5lbs.

I dont know what turbo is on the RB's but sound like 12lbs of boost would be the safe number at max effency, anything that spikes or is beyond the effency of the turbo range will just make your turbo a heat pump and cause problems.

[Rbboost'd_240]

sorry for not replying..well im already getting

oil pump..water pump..zerolift driveshaft and mount kit..timing kit w tensioner/belt..headgasket set...arp main studs..acl bearings..fmic..spec stage 2..front and rear main seals..crankshaft seal..and the rb25swap itself and its running me just under $4000 thats without about 200-250 machine shop cost..and a down pipe...im hoping i get a job soon so i can start working and makesome more money so i dont have to stretch every dollar i got lol

Orlandoforums.com can kiss my ass..this build will be sick and i dont give a damn what people thing

anyways..with this slight rebuild going on and all the parts on stock turbo..reliability is my main thing here..but i would like to make so ok power..maybe somewhere around 300 reliably..250 is fine but it would be nice to have a few more hp..anyone know where i should be at power wise..how much boost i should run..a good turbo to try out(that wont break the bank..
Imo godspeed turbos are good for the money I was running one on my rb25 for 2 years with no problem still got it no shaft and I boosted it all the time it was the 62-1/T4 but that's just my opinion

[DJDANGER24]

I dont know what turbo is on the RB's but sound like 12lbs of boost would be the safe number at max effency, anything that spikes or is beyond the effency of the turbo range will just make your turbo a heat pump and cause problems.well i guess ive been causing problems to my motor for about 4 years now. still runs like a champ and pulls hard.