Time To Think About Turbo Upgrade!

[Driver]

Gday all,

Im bored of 405rwhp and im dont exactly have alot of turbo knowledge.

At the moment i have an r33 '98 n1 engine with the following mods:

n1 turbos

pfc

full exhaust minus dumps

fmic

ebc

cam gears

and the usual crap

pod

bov

i cant remember what else i have..

anyway

for what i have i think the boost seems a little laggy

but im not sure wether to go big single or twin

i just dont want the lag any worse than it is now

dyno attached.

Cheers

Brendan

[700HP-GTR33]

Gday all,

Im bored of 405rwhp and im dont exactly have alot of turbo knowledge.

At the moment i have an r33 '98 n1 engine with the following mods:

n1 turbos

pfc

full exhaust minus dumps

fmic

ebc

cam gears

and the usual crap

pod

bov

i cant remember what else i have..

anyway

for what i have i think the boost seems a little laggy

but im not sure wether to go big single or twin

i just dont want the lag any worse than it is now

dyno attached.

Cheers

Brendan

I know what you mean..

I wish my car took off at the lights at good velocity without thrashing the thing..or sounding like I am.

Nothing beats the slight pedal you need to launch a v8,and nothing beats the force of twin turbos

Lag sucks.

Anyway, if you want to spend some money, get some HKS cams.

HKS 2.8L Stroker kit.

HKS gt-rs Turbos(400psi each)You did say you had a GTR

HKS Stainless dumps(or mild steel)

700cc Sard injectors

Nismo( oil, water,petrol) pumps

Tune it with a APEXIfc D-getro unit...removing the afm's

Oh make sure you upgrade your brakes....

You will have instant response ,plenty in the middle and at the top

I think what happens is the larger the motor the less lag you get, and the less restrictions you have on the airflow,

the better you can tune your lag..

[R31Nismoid]

Your using the older N1's... thats why it doesnt feel so good.

R34 N1s or GT-SS will come on way way earlier than your current ones, and will make the same, if not a tad more peak power.

With such a meatier mid-range you wont know the difference in the car.

Failing that go a little bigger to 2530's or thier Garrett equivalent.

[700HP-GTR33]

Your using the older N1's... thats why it doesnt feel so good.

R34 N1s or GT-SS will come on way way earlier than your current ones, and will make the same, if not a tad more peak power.

With such a meatier mid-range you wont know the difference in the car.

Failing that go a little bigger to 2530's or thier Garrett equivalent.

Hello Nismoid,

A funny thing happened the other day, my daughter aged 7 asked what you were doing with your hand under the table.

My comment "He has an itch so his just scraching "

Anyway Brendon back to the topic......Nismoid are you saying the hks2530's are bigger and have less lag than

N1GTR34 new type turbos.........and is the corresponding turbo in the Garrett GT2860R -5 to the HKS?

My interests are the same as Brendon.......

If it wasn't for the money the convertion for Brendon would have been excellent........I have ordered the GT2860R -5 for my gtr

Keep my fingers crossed on the response levels and the increase in power

[Rolls]

II think what happens is the larger the motor the less lag you get

The bigger the displacement the more exhaust gas you will have at x revs, hence it will spool the exhaust wheel up faster creating boost faster. But also the bigger the motor the more of a restriction the rear exhaust wheel will create so you need to adjust this to suit.

[R31Nismoid]

A funny thing happened the other day, my daughter aged 7 asked what you were doing with your hand under the table.

My comment "He has an itch so his just scraching "

Nismoid are you saying the hks2530's are bigger and have less lag than

N1GTR34 new type turbos.........and is the corresponding turbo in the Garrett GT2860R -5 to the HKS?

No, i said the R34 N1's & GT-SS are very similar, in the same rear housing.

The HKS 2530's are bigger, but the come on later than R34 N1's/GT-SS and make more power.

Brendan needs to decide if he wants bliztering response and similar power, or the same response now, with more power

[R31Nismoid]

more info is all in this thread:

http://www.skylinesaustralia.com/forums/in...=80624&st=0

[ellie]

Why don't you take a step back on turbo size and change your powerful GTR into a response monster GTR. Sacrifice some peak power to spread it through the rev range and earlier spool. Just a suggestion.

I would imagine it would be a totally different animal to drive! Through a friend of mine, I get to drive some really well prep'd cars and I absolutely love responsive cars rather than the huge horsepower cars as they feel faster and much more enjoyable to toy around in! But i'm not a straight line man, I like curves.

[700HP-GTR33]

more info is all in this thread:

http://www.skylinesaustralia.com/forums/in...=80624&st=0

That was some good reading....and i am corrected on the topic of comparing GT to HKS

The GT2860-9 in the Garrett are close to hks gt-ss at 320hp each

The GT2860-5 in the Garrett are close to hks 2530 at 350hp each

and GT2860-10 in the Garrett are close to hks gt-rs at 400hp each

and the GT2860-7 in Garrett are close to the 34N1 at 300hp each

This answers everything now......

The two that spool up the fastest are the gtss and 34N1 320hp and 300hp respectively

These both are lower in horse-power thus spoll quicker and seem like a better ride

The GT2860-5 are the best choice if you have modes to support the horses

and the GT-rs are fantastic for Horse power junkies who want whip-lash

So the answer,(Brendon) if you want to go twin turbo with your modes would be the -5 or 2530's(700hp)

This way you can build the engine, still adding modes and the turbos will not have to be changed

[shonen]

hmmm if im not mistaken I think Driver has an R34 GTT with an RB26 conversion.

So you have to factor in the FR layout of the car......too much power will be quite a handful to drive even in the dry

[rb26s13]

i think you guys missed something aswell

before jumping to the conclusion of changing turbo's

upgrade your dump pipes they will certainly be holding back some spool time and i'd also imagine a bit of topend flow aswell.. im quite suprised they hadnt been done yet anyway...

[Ronin 09]

cams?

[700HP-GTR33]

cams?

I agree, as I suggested to Brendon the ultimate upgrade........but hey we all have budgets....

He is only looking for an upgrade for his Turbos at the moment.........and deciding 2 or single.

There has been no response yet on the single and the cost of the convertion....

I think its because most single convertions.....correct me if I am wrong.....are for drag purposes

and the boost does not come on till 4000rpm making it a very slugish driving it daily.

Hope I have been some help to this thread....good luck with your choice Brendon

[Rolls]

I think its because most single convertions.....correct me if I am wrong.....are for drag purposes

and the boost does not come on till 4000rpm making it a very slugish driving it daily.

He doesnt see boost till 5200rpm with his current setup, I think 4k would be a great improvement.

[Driver]

He doesnt see boost till 5200rpm with his current setup, I think 4k would be a great improvement.

cheers for all the replys so far

yes its an r34 gt-t with an n1 engine

its used for daily driving, but i would like a bit more power and alot better response.

im not really up to touching internals and since its an n1 it should be able to take a bit more still.

stuff like cams, dump pipes, turbos was what i had in mind to upgrade.

but finding suitable turbo(s) is what im after

[R31Nismoid]

hmm... If you are happy with the power, and just want it a LOT earlier, then its R34 N1's or GT-SS in my book.

The power is extremely linear in delivery and good for a RWD car (hence its the same setup i am option for with mt RWD/RB26)

Un-cam'd RB26's ive seen get around 300-330rwkw with just a cam gear + GT-SS (or garrett equivalent)

Numbers vary between dyno's of course.

I would suggest dumps with the GT-SS... cam gear and your well on your way to super response

[rb26s13]

i cant see a reason to change turbos.. i can see a reason to change dump pipes as they are definately holding it back

[R31Nismoid]

Anything before R34 N'1's is overall not good response, a simple search would tell you that.

The dumps are holding it back, yes, but a good 1500rpm, no.

[rb26s13]

i was thinking overall cost.. sure r34 n1's would be better.. but i'd rather change the dump pipes first sure not holding it back 1500rpm.. but still holding it back.. and well sure it shows power can be made with stock dumps.. how ever its also been proven that people make better power all over the shock with a good set of dumps.. the power appears to be very smooth for a rwd setup which is wat i'd want in a rwd car either way he should be upgrading the dumps to get the best out of any turbo either way.. not my car not my money

[700HP-GTR33]

Anything before R34 N'1's is overall not good response, a simple search would tell you that.

The dumps are holding it back, yes, but a good 1500rpm, no.

I wonder why they are spooling up so late?

I think maybe the Tuner set this up for maximum power at the top RPM range

I would of had it tuned for a more responsive ,progressive curve where there is some boost

at 3k to 5k RPM. Who really uses a street car up at 7k anyway?

Sure change the dumps to HKS but also change the tune to road use.