33GTSt How much boost can you run?

[PHATGTR]

If you were to upgrade the turbo on a 33 (or even running standard turbo) how much boost could you safely run?

The main reason I ask is because a mate said that the head gaskets on the 33's are crap and anything over 1 bar of boost and they can easily pop.

Is this true and is it common with both series1's and series 2's or did Nissan rectify this problem on the later series?

I would be looking to make about 250@wheels

Thanks

[Munna]

If you were to upgrade the turbo on a 33 (or even running standard turbo) how much boost could you safely run?

The main reason I ask is because a mate said that the head gaskets on the 33's are crap and anything over 1 bar of boost and they can easily pop.

Is this true and is it common with both series1's and series 2's or did Nissan rectify this problem on the later series?

I would be looking to make about 250@wheels

Thanks

There is nothing wrong with the standard head gasket people often go to a thicker head gasket when running high boost to lower the compression of the engine. From what I have heard 250@wheels should be fine with standard gasket with supporting mods injectors, fuel pump, ecu, turbo ect. Run no more than 10psi with the standard turbo as rule of thumb as the ceramic wheels are week. As for how much boost can I run if you are using an after market turbo it depends on what turbo you are talking about what mods you have ect.

[wheels_24]

agree with munna, you don't really want to push your standard turbo to hard i have heard you can run them safely 10psi and if you want to push it 12 - maybe 13 but thats pushing it a little. If you go the after market say a ball bearing as i have with all the bolt on bits eg. fmic, ecu, pod, injectors, fuel reg and pump i think you can push them up to about 16 - 18psi. Not 100% i am no expert just what i have heard on hear. At the monent i run 16psi on my R32 and thats pretty safe with out open the engine up for the other goodies

[siksII]

head gaskets are good on rb25s, they are not a problem, other things will let go before them.

any more than 10psi is risky on stock turbo

[JULZZ]

my mechanic who used to work for top secret and Nissan Japan reckon that my stock SII R33 turbo would still be safe at 1 Bar....... I've ran mine up to 1.1-1.2Bar and it's still in one piece currently running at 0.8 bar tho for longevity........

[RB30-POWER]

Provided your motor doesn't detonate you won't have any trouble with head gaskets failing.

Get it tuned with the correct air fuel ratio's and ignition timing and 250rwkw is easily achievable on stock RB25 engine internals.

[bazr33]

ohhh mate , easily run my car at 50psi on standard turbo

bloody goes great guns!!!

haha nah how bullshit was the game tonite !!!

i have to work tommorow ****!!

nah standard turbo man on r33 gtst run 10psi max to be safe, i have heard pplrunnin 12 and 15 but ya know depends how ya drive, and what ya do.

my car is tuned to run 8psi cause anythin over it ****in goes no where,

and is it 250 rear wheel kilowatts or horsepower.

cause horspower would be doable with a standard turbo

but kilowatts, mate you'll blow up the turbo b 4 gettin to there safely !!

anyway im gone, im takin my car down the quarter next weekend, with the manual conversion in

see how she goes! hope it doesnt fall apart !!

THannks ,

Baaazzz!!!

[RB30-POWER]

250rwkw is not do-able on a standard turbo, injectors and management.

I was simply refering to the fact the RB25 will make that power without having head gasket issues, which was asked about above.

Who would waste time with a standard turbo in the hunt for power anyway.

[The Mafia]

I have a standard turbo, with and apexi pfc FMIC, and full custom exhaust.

Car is running 12psi, been like that for about 12 months plus, and I am always on boost (hence me fueling up alot ) turbo is fine.

[LANFOH]

The head gasket is not what you have to worry about its the ceramic turbine in the stock turbo that is the weakest link when it comes to boosting up the psi. I would run 10psi to be safe but have heard still some people blowing there turbs at that pressure so it up to you if you want to risk it. Best bet if you want that power figure is to get a new turbo or high flow it to be safe. This topic has been discussed heaps on the forum do a search.

[Robo's]

Thats right, the head gasket isnt the problem with a standard turbo, its the ceramic wheels that dont like alot of boost. Im running 20psi with a 2530 with standard head gasket so yeah they can take boost.

[r33GTS-t-200kw]

i run around .9-1 bar on my stock turbo.. after 140k's no shaft play on turbo and wheels arent warped neither are the housing. I run it on .5-.6 bar to put around town tho. around 1 bar is only for short spurts. I have some sort of engine management to keep the AF's in a great line :Dj:

[PHATGTR]

So basically, there the turbo is the problem with the r33's and not the head gaskets.

Thanks for all the replies guys!

[geno8r]

agree with munna

Yeh true... but on another subject... 'Your Signature'

Dude... Although 210 Rwkw sounds correct.. I'm pretty sure your not getting 729Nm of Torque God dam!!!! lol Unless your running 24+ pound boost 'in which you wouldn’t only be getting 210 rwkw'

[abcent]

so stock turbo aside.....the first part of the quiestion was "If you were to UPGRADE the turbo on a 33 how much boost can it hold"??

this is something i'd be keen to hear about myself, being i'm currently running a Hi-flow turbo on my 33 @ 18-20 psi....how far can I go before the head gasket gives way? i know short one off dyno runs an stuff it can handle a fair bit off boost, but what about with full boost being used for greater amounts of time...like say circuit racing or drifting?

[Slide]

Ive been running 12-13psi boost on stock turbo for the last year and still has no shaft play and never had a hickup.

I do have HKS Cams though so weather that has contributed to its longevity in pissing off exhaust through a straight through 3.5" turbo back with high flow cat *shrugs*

But i just bought a Highflowed TO4e

So if it blows i will let yous know how much boost i could squeeze in

[wheels_24]

Not reading it wrong buddy on my dyno graph it has 2 lines kw and toq and in the top right corner it tells me max rwkw and it tells me max touque so hate to dissappoint you but i do have 729nm. I have a pretty big turbo on my car would that help such high reading it is a GT30 ballbearing the guy that i bought it off said it is good for 650hp+

[geno8r]

Not reading it wrong buddy on my dyno graph it has 2 lines kw and toq and in the top right corner it tells me max rwkw and it tells me max touque so hate to dissappoint you but i do have 729nm. I have a pretty big turbo on my car would that help such high reading it is a GT30 ballbearing the guy that i bought it off said it is good for 650hp+

I'm not car or torque expert I just thought this doesnt sound right out of my common sense. A ford FPV GT makes around 550 Nm T at the flywheel I believe, this is from a 5.7L V8 which is very torquey & i think it makes around 300 kw at the fly also. Now lets guestimate you have around 270 Kw (210 rwkw + 60kw drive train loss) at your fly on a 2L engine only running 16psi. Like I said, I dont know what the exact equations are for torque figures but I certainly know that 729 Nm T! is a absolute shit load for a 2L engine running under 20 pound. I mean stock Mercs V8 Supercharged cars make around this figure. A Holden Monaro with a Twin Turbo kit makes around 850 Nm T, so a 2L running 16 pound making 729 Nm T just doesn’t sound right to me.

Anybody else who actually knows more about torgue figures please but in? Where SK when you need him... He'd set things straight. 'regardless whos right or wrong'

[netrati]

No something is wrong with the dyno graph. There is no way you can have 729nm of torque and only 210kw.

[wheels_24]

well thats up to you guys to believe that but thats what the dyno sheet says and i haven't seen one that has lied before