R34 Gtr Mild Mods

[Phatboy]

Hi guys, just wondering if I can get some advice. I would like my R34 GTR (non-Vspec) to make around 330kw at all four wheels, while still being responsive with minimal turbo lag.

Current minor mods are:

HKS split dumps

HKS front pipe

HKS hipower catback exhaust

HKS adj cam gears (IN/EX)

HKS timing belt with Trust clear cover

Apexi Pod Filters

Apexi PowerFC ?with boost control (1.2 bar max)

- Not sure whether I actually have the boost controller solenoid with the PFC.

Nismo twin plate clutch (super coppermix)

I am not sure what power it makes at the moment as it hasn't been dyno'd.

I was recommended the following mods from one of the tuning shops:

Twin Garrett GT2560RS as bolt-on replacements for the turbos

Nismo 600cc injectors

2 X Nismo air flow meters

Retune cam gears/PowerFC

The quote was around $5500 including installation. $6000 if an HKS-EVC was installed as well.

Do you think this is a reasonable price, and what kind of power do you think would I be able to produce? Any other mods that you would recommend?

I would like to keep daily driveability, good response, but just a bit more power than stock. I don't really want to play with camshafts or internal engine work.

Thanks very much.

[N1GTR]

Best bet is to search, this question gets asked pretty much once a week at least

In short, -5's will do - or maybe even a pair of -7's wound right up.

Pay $2500 for turbos. $500 to install. Whatever to tune. $450 for EBC. Whatever for injectors (look at forum traders for prices), same goes for nismo AFM's.

[Got Boost?]

Hey mate! That list of mods is pretty spot on for what you are wanting. My car has similar mods (listed in my sig) except i have not yet got cam gears or the nismo AFM's. I had mine tuned at it maxed out at around 270kw because of the AFMS. If you have the nismo versions you would easily be set to make a decent amount more power.. which is exactly what i'm planning on doing. Although i am also going to get a head gasket installed to save the motor and run a little more boost!

Keep in mind the 2860-7s start to run out of puff at around the power mark you are aiming for if memory serves me right! But they should be able to pull around about the figure you are asking. An oil cooler might be a sensible mod to add to your list also!

Don't worry about replacing the cams, with the power your chasing and with response in mind the standard ones are great!

[R31Nismoid]

Same as everyone else (there are dozens of threads on this now by the way)

You the turbos you want are

GT-SS or -7s or R34N1's

[Bakes]

Wouldnt Garrett 2860R-5 turbos be perfect for his aim?? Or am I wrong?

[NZM.031]

wouldnt it be a little better to get some bigger turbos, run less boost, and do cams to keep midrange torque instead of doing the head gasket??

the only reason i say this is because.. 330kw maybe great for a few months... but what happens when youve spent $2500 for turbos that run out of puff when you want 370-400kw

while the 2860-5s maybe be perfect for the bullseye, it doesnt give much more room for more power.

*this is just a thought, im not too crash on the turbo specifications and have only ridden in a 400+kw gtr once... im also happy with the power of my stockish rb20... so 330kw is double what i have, basically un-imaginable from my point of view... but i do know that you always want a little more later on and to spend that much money and get bored doesnt make sense*

cheers

Linton

[MrStabby]

wouldnt it be a little better to get some bigger turbos,

He said "while still being responsive with minimal turbo lag" so it sounds like he's more interested in response that turbo headroom.

[No Crust Racing]

Mate I asked this exact same question, have a read through this.

http://www.skylinesaustralia.com/forums/De....html&hl=gt

[NZM.031]

He said "while still being responsive with minimal turbo lag" so it sounds like he's more interested in response that turbo headroom.

riiiight... gotcha... so a t88 is out of the question then.

[R31Nismoid]

Wouldnt Garrett 2860R-5 turbos be perfect for his aim?? Or am I wrong?

Nope... they are 380-400rwkw turbos, not 330rwkw

[Beer Baron]

I was recommended the following mods from one of the tuning shops:

Twin Garrett GT2560RS as bolt-on replacements for the turbos

Nismo 600cc injectors

2 X Nismo air flow meters

Retune cam gears/PowerFC

The quote was around $5500 including installation. $6000 if an HKS-EVC was installed as well.

Do you think this is a reasonable price, and what kind of power do you think would I be able to produce? Any other mods that you would recommend?

I would like to keep daily driveability, good response, but just a bit more power than stock. I don't really want to play with camshafts or internal engine work.

Thanks very much.

sounds good and the price sounds good too.

I would go for it. it will be $5K well spent. providing the engine is in good shape 1.2 or 1.3 bar should get you over the 300rwkw mark easily.

[Phatboy]

Best bet is to search, this question gets asked pretty much once a week at least

In short, -5's will do - or maybe even a pair of -7's wound right up.

Pay $2500 for turbos. $500 to install. Whatever to tune. $450 for EBC. Whatever for injectors (look at forum traders for prices), same goes for nismo AFM's.

I did search, but none of the posts really answered any questions about the total cost of this. I did find a lot of useful info, though.

Sorry for being n00b at this, but -5 and -7 are variations of Garrett GT2860R right? It sounds like most people are recommending these instead of the GT2560R. What's the difference between these???

Also, would you recommend the HKS EVC as an EBC?

Thanks

[rev210]

I would look at the -9's too

[some_cs_student]

Same as everyone else (there are dozens of threads on this now by the way)

You the turbos you want are

GT-SS or -7s or R34N1's

R31Nismoid, just want to clear up something, your post advises GTSS/-7's/R34N1's are the same, but this thread, second page in particular:

http://www.skylinesaustralia.com/forums/Gt...tml&hl=2860

Advises -9's are GTSS and -7's are R34 N1's which are a smaller difference but they are different.

Just trying to work out who is correct on the turbo specs...

Oh, Phatboy, I think 2860 and 2560's are the same in the end, the above thread may clarify it.

[Phatboy]

Thanks, I think I understand now about the three most popular turbo upgrades in this power range for GTRs after reading the posts and looking at the Garrett website, which recommends all three as direct bolt-on replacement turbo upgrades for RB26DETT's standard Garrett GT2556.

-5 = Garrett GT-2860R variant = HKS GT-2530 (Rated at 250-360 HP each = 500-720 HP or 373-537 kw)

-7 = Garrett GT-2860R variant = R34 N1 Turbo (Rated at 150-310 HP each = 300-620 HP or 224-462 kw)

-9 = Garrett GT-2560R variant = HKS GT-SS (Rated at 200-330 HP each = 400-660 HP or 298-492 kw)

Does that mean that the -9s are probably a good compromise between power and response???

Please correct me if I am wrong.

[Penfold]

Thanks, I think I understand now about the three most popular turbo upgrades in this power range for GTRs after reading the posts and looking at the Garrett website, which recommends all three as direct bolt-on replacement turbo upgrades for RB26DETT's standard Garrett GT2556.

-5 = Garrett GT-2860R variant = HKS GT-2530 (Rated at 250-360 HP each = 500-720 HP or 373-537 kw)

-7 = Garrett GT-2860R variant = R34 N1 Turbo (Rated at 150-310 HP each = 300-620 HP or 224-462 kw)

-9 = Garrett GT-2560R variant = HKS GT-SS (Rated at 200-330 HP each = 400-660 HP or 298-492 kw)

Does that mean that the -9s are probably a good compromise between power and response???

Please correct me if I am wrong.

Those ranges seem crazy - HKS GT-SS is about 270kw to 320 KW & R34 N1 Turbos would be a tad less probably 240kw to 300KW. If you don't drag your car that often and want the power for the street - 300 KW from the GT-SS, or -7 would be fairly responsive. The only problem is you do need the supporting mods + your kinda stuck at that power level. But a GTR with an easy to use power band - 2500-7500 RPM with a friendlish clutch is good if its a daily driver.

[Phatboy]

Those ranges seem crazy - HKS GT-SS is about 270kw to 320 KW & R34 N1 Turbos would be a tad less probably 240kw to 300KW. If you don't drag your car that often and want the power for the street - 300 KW from the GT-SS, or -7 would be fairly responsive. The only problem is you do need the supporting mods + your kinda stuck at that power level. But a GTR with an easy to use power band - 2500-7500 RPM with a friendlish clutch is good if its a daily driver.

I'm just quoting from the Garrett website, but you're right, these are the power ratings the turbos are rated for, not what might be reliable for them or the engine.

That's good to hear that the GT-SS (-9) would be probably slightly more powerful than the R34 N1's (-7).

My impression was that around 300-330 awkw would be the sweet spot balanced between power and

- response

- driveability

- reliability

If you wanted to produce any more power the engine internals would have to be replaced/rebuilt at significant expense, and other mods like cams, fuel pumps/rails, intercooler, piping, radiator, plenums/manifolds, throttle bodies would need to be upgraded. The laws of diminishing returns kicks in as the cost rises exponentially for every kw you gain. And it would be a pig to drive on the street due to the turbo lag, unless I never leave 1st gear.

Edited November 5, 2008 by Phatboy