N1 turbos - how much boost

[wrxhoon]

I have N1 turbos in my r33 ( r33 N1's ) 360 deg sleeve bearing .

All N1 /nur turbos are steel wheel , only R34 turbos are ball bearing ( all r34 gtr turbos both ceramic wheel and steel wheel are ball bearing ).

When i was in Japan i saw at least 3 different types of so called r34 nismo n1 turbos , so there are different types .

I have full boost ( 1.2 bar ) @ 4500 rpm in 3rd gear and it holds all the way to the 8100 cutout .

so was wxrhoons N1 SS/BB (R34s) or not ?

[R32-GTS]

']gotboost did 360 odd rwhp with his n1's  at 17psi, its about the realistic limits of the turbines

Got boost had stock as a rock turbo's and standard cams to make 371 rwhp.

[R31Nismoid]

My upgrade plan is as follows (in order)

Stage 1: full rebuild with forgies + the N1s – done

Stage 2: PFC + HC and dyno tune (real soon now)

Stage 3: 044 fuel pump + 700cc injectors + Splitfire coils

Stage 4: 600x300x100 FMIC + hard piping  

(did I miss anything?)

I'd like to keep the boost under 20psi – just to be on the SAFE side

I'll probably do AFMs somewhere along the way too – see my post about RB25 AFMs on a GTR

The bigger FMIC will keep the temp down - yes  

any guesses on a rwkw for this sort of setup

Get your injectors/fuel pump and THEN take it for a tune.

It will save you $$$ in the long run.

Actually, do all your mods listed at once if you cant

[siksII]

My upgrade plan is as follows (in order)

Stage 1: full rebuild with forgies + the N1s – done

Stage 2: PFC + HC and dyno tune (real soon now)

Stage 3: 044 fuel pump + 700cc injectors + Splitfire coils

Stage 4: 600x300x100 FMIC + hard piping  

(did I miss anything?)

I'd like to keep the boost under 20psi – just to be on the SAFE side

I'll probably do AFMs somewhere along the way too – see my post about RB25 AFMs on a GTR

The bigger FMIC will keep the temp down - yes  

any guesses on a rwkw for this sort of setup

If the fuel pump/injectors are the same as on a r33gtr then without them you still should be able to run 20psi with a safe tune.

if the r32gtr afms are the same as r33afms then you will not need to upgrade these either, although its not unlikely that they might need replacing at some stage anyway, and you might as well put better ones in..

also why use spitfire coils? are your current ones not working properly?

even if you upgraded the injectors, 700cc is not necessary, 550 would be fine if you are sticking to n1s or similar (2530)

if you run 20psi with r33 n1s your car should have 300-320rwkw (400-430rwhp)

should be enough to run mid 11s.

[pnblight]

My upgrade plan is as follows (in order)

Stage 1: full rebuild with forgies + the N1s – done

Stage 2: PFC + HC and dyno tune (real soon now)

Stage 3: 044 fuel pump + 700cc injectors + Splitfire coils

Stage 4: 600x300x100 FMIC + hard piping  

(did I miss anything?)

I'd like to keep the boost under 20psi – just to be on the SAFE side

I'll probably do AFMs somewhere along the way too – see my post about RB25 AFMs on a GTR

The bigger FMIC will keep the temp down - yes  

any guesses on a rwkw for this sort of setup

as messioned the term N1 turbos cover a number of different turbos all quiet different but if these are the 320hp ball bearing garret (n1)steel wheel with 0.60 and 0.64 housing your in luck in my opinion maybe one of the best turbo combos for a street gtr (on a dead par with hks25/30)

Stage 1: full rebuild with forgies + the N1s – done (excellent)

Stage 2: PFC + HC and dyno tune (real soon now) (yep great ideal)

Stage 3: 044 fuel pump + 700cc injectors + Splitfire coils ( injectors yes dont know if you really need pump and coils as i'm running 525rwhp on std gear)

Stage 4: 600x300x100 FMIC + hard piping (yep great ideal)maybe the money saved from pump and coils would be better spent on oil cooler and custom radiator ,maybe even 9litre sump) KEEP HIM COOL

trying to remember you done cams good investment mate

with this implace you should be able to run up to your 20psi (18psi is good on N1)

and mid 400s rwhp shouldn't be out of the question (330rwkw)

only my opinion

hope it helps

[pnblight]

If the fuel pump/injectors are the same as on a r33gtr then without them you still should be able to run 20psi with a safe tune.  

if the r32gtr afms are the same as r33afms then you will not need to upgrade these either, although its not unlikely that they might need replacing at some stage anyway, and you might as well put better ones in..

also why use spitfire coils? are your current ones not working properly?

even if you upgraded the injectors, 700cc is not necessary, 550 would be fine if you are sticking to n1s or similar (2530)

if you run 20psi with r33 n1s your car should have 300-320rwkw (400-430rwhp)

should be enough to run mid 11s.

trust me 550cc will not be enough as my would have max them out and i believe a brand new gtr got toasted on 550cc in wa WHY upgrade twice go the 700cc TRUST ME the pfc handle them beautifully purrs if kitten at idol

[MSRB26]

I am running the R34 N1's with the .64 ex housing and making 302.9kw on 17psi. Going back on the dyno soon to wind it up to around 20psi and see what it does.

[voona]

Are any of you guys running these turbos on standard internals? Do you belive that 34 N1's @ 1.2 Bar is going to be reliable for sometime? Im looking at this route but dont really want to open the engine unless its 100% nessessary.

Cheers

[fsmout]

Hey man,

I am in nearly exactly the same boat with my GTR 32. The rebuild should be complete in 3 weeks. It had damage to one of the pistons when i bought it and i have to rebuild now. The piston let go 5 days after i bought it! So now i am putting shot peened rods, arp bolts, and arais foggies (87.5mm) in for the bottom end.

I am running n1's bought at unique motorsport (320hp), 750cc injectors, z32's, ap-fc and fmic. Before it blew i was spooling @ 3500rpm and hitting full boost at about 4000. This is with piston 4 running low at 89psi, so they might be more responsive with a healthy engine??

Ill let you know how i go when i get mine on the dyno. im hoping for 300-350kw.

cheers,

[siksII]

trust me 550cc will not be enough as my would have max them out and i believe a brand new gtr got toasted on 550cc in wa WHY upgrade twice go the 700cc TRUST ME the pfc handle them beautifully purrs if kitten at idol

wrxhoons car is running standard injectors, with r33 n1 turbos running 1.3bar(20psi) they are nearly on their limit but still fine, to prove the power he has run (as mentioned above) 11.7@121mph, so imo there is no way your would need 700cc injectors, 550s would be fine, but not that necessary to make good power.

[pnblight]

wrxhoons car is running standard injectors, with r33 n1 turbos running 1.3bar(20psi) they are nearly on their limit but still fine, to prove the power he has run (as mentioned above) 11.7@121mph, so imo there is no way your would need 700cc injectors, 550s would be fine, but not that necessary to make good power.

well mate std internals ,N1 turbos 11.3@125mph so to do this i would have max them out even by your calcutations why go 550cc and max them when 700cc will do everything the 550 will and more(crazy) is it worth toasting engine trying to run small injectors WHAT THE POINT REALLY may you ask a performance shop now closed who were famous for trying this ooppp (there closed).And the famous motor toasted like a couple of others

if your nearly maxing out injectors there to small, as most responciable tuner try to stay under 90% and the rb26 with n1 turbos can produce 400rwkw as mine is ,and i know of a couple others in this range or better.

LAST WORD 700cc (dont kid yourself) listen to the other gtr owners stated at the start of this thread

[7heavn]

I soppose every set up and car is differen't , I think that 550cc injectors are the go on an internally std rb26 running sane boost no more then 1.3bar on pump fuel . But like stated by pnblight if your going more then 90% duty cycle it would be wise to move up .

Only other thing I've been told is if you move right up to something like 720cc injectors cause of the bigger flow they become less refined and will make the car harder to tune at the lower rev's don't know if there is any truth in this?.

[pnblight]

I soppose every set up and car is differen't , I think that 550cc injectors are the go on an internally std rb26 running sane boost no more then 1.3bar on pump fuel .  But like stated by pnblight if your going  more then 90% duty cycle it would be wise to move up .  

Only other thing I've been told is if you move right up to something like 720cc injectors cause  of the bigger flow they become less refined and will make the car harder to tune at the lower rev's don't know if there is any truth in this?.

Well i can tell you this is not the case with pfc ,i an not comment on other management system and my std internal n1 turbo gtr at 1.3bar makes ~518rwhp and no the 550cc wouldn't have made this hp (with out major pressure increase to feed system in my opinion) i just cant understand why you would want to upgrade to small injectors

[itbmils]

Guys

thanks HEAPS for all the feed back and comments – it looks to me like I should easily get the power I'm looking for (and more).

Just to clear things up - I agree the 700cc (or similar) are the way to go (even tho the 550cc would probably be enough) - the price difference between 550cc and 700cc is not that much (according to Nengun anyway) - so OVER SIZED injectors makes sense to me (as long as I can get reasonable bottom end tune – had not thought of that)

One other thing - I can confirm that the ex housing is .64 ('cause it's stamped on the housing) but I can't see anything on the compressor housing. Does anyone have the specs on the 'other' N1s. I'd like to confirm I have what I think I have.

I also agree that these should be a very good street turbo – they better be 'cause that's why I bought them

The part number is : 14411AA403 if that helps (series 3 N1s AFAIK) – it MUST be true the guys at Nissan told me so

[siksII]

well mate std internals ,N1 turbos 11.3@125mph so to do this i would have max them out even by your calcutations why go 550cc and max them when 700cc will do everything the 550 will and more(crazy) is it worth toasting engine trying to run small injectors WHAT THE POINT REALLY may you ask a performance shop now closed who were famous for trying this ooppp (there closed).And the famous motor toasted like a couple of others  

if your nearly maxing out injectors there to small, as most responciable tuner try to stay under 90% and the rb26 with n1 turbos can produce 400rwkw as mine is ,and i know of a couple others in this range or better.

LAST WORD 700cc (dont kid yourself) listen to the other gtr owners stated at the start of this thread

Hey, im not saying you are wrong, it IS safer to have bigger injectors.

My point is that i know a gtr owner who runs standard injectors, n1s @20psi and has run an 11.7@121mph 1/4 mile, and i didnt state it before, but the injectors were running at maximum 90% duty cycle. seeing this is enough evidence for me to not change the injectors unless running more than 20psi..

but then again, since there is a few different types of N1 turbos, for your car @20psi, bigger injectors may be needed in your case.

and yeah i have read about that particular performance shop and dont agree with what they do either.

[MSRB26]

Guys

thanks HEAPS for all the feed back and comments – it looks to me like I should easily get the power I'm looking for (and more).  

Just to clear things up -  I agree the 700cc (or similar) are the way to go (even tho the 550cc would probably be enough) - the price difference between 550cc and 700cc is not that much (according to Nengun anyway) - so OVER SIZED injectors makes sense to me (as long as I can get reasonable bottom end tune – had not thought of that)

One other thing - I can confirm that the ex housing is .64 ('cause it's stamped on the housing) but I can't see anything on the compressor housing. Does anyone have the specs on the 'other' N1s. I'd like to confirm I have what I think I have.

I also agree that these should be a very good street turbo – they better be 'cause that's why I bought them

The part number is : 14411AA403 if that helps (series 3 N1s AFAIK) – it MUST be true the guys at Nissan told me so

If that is your part number you have the exact same turbos as me so there is no reason you won't make power. They are great turbos

I am also running 700cc injectors and have no problems in getting a good tune and i'm not running a power fc either so providing you have a good tuner i don't know why you would have any problems with that.

Provided you have a good tune and you maintain the engine properly there is no reason why standard internals wouldn't last at these kinds of power levels. It's all in how you look after you engine and the condition it is currently in.

[blur]

i have r32 n1s on my car (with .64 rear housing), while my power may not be quite as high as the r34 type n1s, i cant wait to see what she does when the boost is up! question though, is how critical is hard intercooler piping? is it a known problem for these cars?

[itbmils]

If that is your part number you have the exact same turbos as me so there is no reason you won't make power. They are great turbos    

I am also running 700cc injectors and have no problems in getting a good tune and i'm not running a power fc either so providing you have a good tuner i don't know why you would have any problems with that.

Provided you have a good tune and you maintain the engine properly there is no reason why standard internals wouldn't last at these kinds of power levels. It's all in how you look after you engine and the condition it is currently in.

Cool

my engine is now BRAND NEW - I've gone with a fully forged bottom end, N1 water + oil, N1 bearings etc - just to be on the safe side (it's only money after all !!!)

did you upgrade your fuel pump

what other mods have you done

what sort of power are you getting

most importantly - you does your tuning - can my guy (Brisbane) talk to your guy ???

talk to me !!!

[itbmils]

i have r32 n1s on my car (with .64 rear housing), while my power may not be quite as high as the r34 type n1s, i cant wait to see what she does when the boost is up! question though, is how critical is hard intercooler piping? is it a known problem for these cars?

I'm not too sure how IMPORTANT it is with these cars - but I have had other turbo cars in the past with hard piping kits installed - and I think it's just the done thing. I

can anyone else tell me WHY I think this way

[sebaz]

As further support to what has been said, my R33 GTR is running similar numbers to others mentioned at +20psi on custom spec N1's. I also run 550cc injectors and they're running at 70% duty cycle. Plenty left.

Bigger isn't necesarily better. Think hip pocket!! You can get better granularity in your map the smaller the injector helping to improve fuel economy and efficiency if setup properly.

It depends on your project too. If you're planning another power up later on then sure get the bigger ones. Makes sense. If not, then maybe not? although many would argue with this, I believe there's not much use for more than 300Kw on the street. Its just a waste cause you can't really use it and it changes the whole dynamics of a street GTR. Anyone that has one will agree that day to day it's already far from a show room model with this much power. You chew everything tyres, fuel economy, clutches, gearboxes you get the idea. Shit thats the point though right? We love it :-p

You will loose some of your down low mapping capabilities the bigger you go with injectors. Obviously it depends on the quality of your ECU (and the injector for that matter) and your tuners ability to get it right, but regardless, the bigger you go the less control you'll have. Especially on your cold start setup. Less of a problem these days with injector quality.

Like anything you need to look at the whole fuel system, keep it all on the same level. Its all symantics if your running a stock pump.

Good luck with it,

Sebaz