Rb25 Replacement Turbo? High Flow?

[gotRICE?]

Hey there, Yeh you can run your highflow turbo with your stock ecu but beware.... once your boost goes past 12psi..... you will hit R&R and therefore you will require your spark plugs to be gapped at 0.8mm and will start miss firing past 3-4rpm.... it will miss..

I dont think RnR has anything to do with the spark plugs, its the AFM reaching its limit is it not

[Sydneykid]

R&R, stands for rich and retard. Nissan programmed the engine mapping so that when the standard airflow pattern is exceeded by much then the ECU dumps in more fuel and retards the ignition timing. This is to protect the engine as the only reason for higher than normal airflow is something is wrong or someone has fiddled with the engine, either way Nissan has taken steps to protect the engine from damage. Sticking on a high flow turbo is most definitely fiddling with the engine so, without tuning, you can expect piss poor fuel economy, oil contaminated with fuel and an incurrable misfire from the retarded ignition timing.

There is plenty written on the subject of R&R, a lot of it by me, so I strongly suggest that you try a search.

Cheers

Gary

[andymoocow]

welcome back SK!!!

[sriver killer]

just interested

are there any other turbo's which are a direct bolt up replacement for the 25 turbo?

[Lachlan33]

You can get kits that bolt up like the HKS GTRS. Any turbo though will most likely cause the R&R issue SK was talking about. You really do need some sort of managment.

[simpletool]

HKS GTRS kits are worth considering now the Aus/Yen is decent. Many highflows use a similar (or the same) core as the GTRS - but none will get results quite as good due to housing constraints. Rated at 290kw (flywheel) - so around 230rwkw at just under 1bar.

Plus a GTRS kits is 100% new parts and you get to keep your old turbo.

I'm looking into turbo replacements as well, but considering the total all up cost would be $4800 it's hard to justify.

480cc injectors ~ $450

Z32 AFM ~ $250

Power FC ~ 1200

HKS GTRS ~ $2900

Total = $4800.

[gotRICE?]

+ Tune if you cant do it yourself..

[and3_3]

HKS GTRS kits are worth considering now the Aus/Yen is decent. Many highflows use a similar (or the same) core as the GTRS - but none will get results quite as good due to housing constraints. Rated at 290kw (flywheel) - so around 230rwkw at just under 1bar.

Plus a GTRS kits is 100% new parts and you get to keep your old turbo.

I'm looking into turbo replacements as well, but considering the total all up cost would be $4800 it's hard to justify.

480cc injectors ~ $450

Z32 AFM ~ $250

Power FC ~ 1200

HKS GTRS ~ $2900

Total = $4800.

That $4800 equals solid reliable quality performance. It really is worth it to do it right the first time than doing it cheap and having stuff go wrong or being unsatisfied in the end and spending more money for quality upgrades you should have done in the first place.

4800 isn't very expensive anyway... Your getting a 250rwkw ish performance machine for around 25k in total.

Thats just my opinion though

[TR33NT]

Hey there, Yeh you can run your highflow turbo with your stock ecu but beware.... once your boost goes past 12psi..... you will hit R&R and therefore you will require your spark plugs to be gapped at 0.8mm and will start miss firing past 3-4rpm.... it will miss..

Hey there- What the bloody hell is R+R?? i run 14psi on my stock turbo (rb25) and runs kick ass!! lol

I have my plugs gapped at 0.5mm and just have FMIC, HKS POD, 3inch catback and dont have the missing prob-

I only recently got the catback done too and didnt have the issue before-

so just curious, Am i just lucky??

[JET-25L]

Yep you are one in a million take it to the strip and run a ten already. I'd be surprised if the standard dump pipe could even flow 14psi.. as well as the turbo.. among other things...

I ran my highflow on standard ecu for about a year driving around on it fine. It had a bit of a flat spot up the top but apart from that the ecu seemed to want to play ball.

That said i would much rather drive a car with an ecu (power fc/microtech) with a standard turbo than a highflow and stock ecu having had both now.

The best thing about highflow turbos if you go that path is there is always people wanting to buy them... coz they're cheap and effective and produce quite good results. So down the track if you want to go to a bigger turbo then you should be able to sell the highflow for near what you bought it for provided it's in same condition.

[gotRICE?]

Hey there- What the bloody hell is R+R?? i run 14psi on my stock turbo (rb25) and runs kick ass!! lol

I have my plugs gapped at 0.5mm and just have FMIC, HKS POD, 3inch catback and dont have the missing prob-

I only recently got the catback done too and didnt have the issue before-

so just curious, Am i just lucky??

you probly THINK it runs kick ass because your boosting '14psi bro'. But its probly not. Its just fact.

[battery]

I'd be surprised if the standard dump pipe could even flow 14psi.. as well as the turbo.. among other things...

are you serious? the stock dump will flow 14 psi easy, my boost controller decided to give up one day and my stock turbo was hitting 25psi for a good 3-4 runs in 3rd, makes a different noise up at that level haha.

[JET-25L]

or maybe your boost controller was fine and your gauge wasn't:)

[battery]

naa it was the controller a pipe had fallen of the solenoid.

[Ultimategtr]

are you serious? the stock dump will flow 14 psi easy, my boost controller decided to give up one day and my stock turbo was hitting 25psi for a good 3-4 runs in 3rd, makes a different noise up at that level haha.

Ouch, said the Head gasket

[TR33NT]

you probly THINK it runs kick ass because your boosting '14psi bro'. But its probly not. Its just fact.

It certainly runs alot faster when its on 14psi then any other- you dont have to be clever to figure that out-

it was a little bumpy above 13 at first, then i gutted the cat- then it went fine- now with the 3inch catback its running even better!

[TR33NT]

Yep you are one in a million take it to the strip and run a ten already. I'd be surprised if the standard dump pipe could even flow 14psi.. as well as the turbo.. among other things...

I ran my highflow on standard ecu for about a year driving around on it fine. It had a bit of a flat spot up the top but apart from that the ecu seemed to want to play ball.

That said i would much rather drive a car with an ecu (power fc/microtech) with a standard turbo than a highflow and stock ecu having had both now.

The best thing about highflow turbos if you go that path is there is always people wanting to buy them... coz they're cheap and effective and produce quite good results. So down the track if you want to go to a bigger turbo then you should be able to sell the highflow for near what you bought it for provided it's in same condition.

The Dump can handle whatever you throw at it.. i couldnt imagine a stock turbo hitten 25psi without a bang but it does fine with just 14 psi now-

Im going to4e high mount with ext w/gate soon enough, that should prove to be interesting, str8 3inch from turbo to canon... mmm... lol

[sriver killer]

sori for digging up an old thread.

ive settled on a hypergear highflow and nistune in the new year.

r33 series one what do stock inj max out at?

i've been told various things, tuner told me 260hp atw it maxes out at.

and that injectors max out before the afm does.

does that sound about right?

i jus don't want to have to overcapitalise injectors if i don't have to.

i surfed through the rb25turbo upgrade thread and 33's seem to make easy 220rwkw on stock inj. without an fpr.

anyone had much gains with a nistune on a totally stock r33 (exhaust and fmic, 10psi)?

[JonnoHR31]

it all depends. i maxxed myne at 185rwkw on a very restrictive setup with a safe tune, other people have pushed them to over 250rwkw. to make the most of the highflow safely you'll need some bigger ones tho.

Edited December 22, 2009 by JonnoHR31

[sriver killer]

it seems that to make a high flow upgrade worthwhile, i have to upgrade injectors.

i have tried searching for hours,

but if i nistuned my car as it is, (fmic, 3.5 inch turbo back. 10psi, bosch 040, bcpres7)

would there be much gains?

i just want to justify $1000 down the drain.

i was told to source 550 cc inj

are there any direct bolt ups from other nissans that are available secondhand?