Best Turbo For R34 Without Opening The Engine

[infected flow]

IF you want the BEST turbo available on the market, bar none, its the Apexi RX6B series.

Blistering response, massive power potential. But you pay through the nose.

Unquestionably best of the best for response and good power.

The Apexi turbo will make 280 rwkw and better than stock response on a skyline.

really this is new......

thats a big call for response even though i love the apexi turbo ... the rx6 with a p22 housing will still be laggy and it wont be as responsive as the stock turbo ..the rx6 is still very responsive as big turbo's go hey ill even say its awesome but it still wont be as respnsive as a 2835pro s or 3037 pro s.. the apexi turbo will make over 280rwkw no probs with that exhaust housing but bottom end beware!

now options

-gcg hiflow

- gtrs

- 2835pro s

- 3037 pro s

also fuel upgrade would be great , computer, hmmm shit i got a mental blank ...hahah

ohh and the full kit for apexi costs over 7k but u also get the exhaust manifold...(they crack also..)

Edited April 19, 2007 by infected flow

[SS8_Gohan]

where do the slide turbos' fit in? are they the same/better than the GCG?

[Adriano]

Please do a search, this has been answered 100's of times, a slide is almost as goos as a GCG, as it isn't ball bearing, however it is about $600 cheaper, and maybe 5kw less

[Bass Junky]

The GCG is going to have better response than the Slide, but neither will be as good as the GT-RS or the Apexi.

Speed costs money, how fast do you want to go?

[illusiVe]

now options

-gcg hiflow

- gtrs

- 2835pro s

- 3037 pro s

also fuel upgrade would be great , computer, hmmm shit i got a mental blank ...hahah

Thanks for the list of options and help

from what i've been doing more research the RX6 seems to be laggy and very expensive. but hit boost hard.

Will i definatly need a standalone ecu even though i have an SAFC or would i need to tune other stuff and get rid of RNR?

do i need bigger injectors and other stuff aswell ?

[cln]

AX53B70 ftw!!

[jazza08]

There's f**k all info on apexi turbo's around and they cost a fair bit!

HKS gtr-s has come down heaps in price lately, awsome turbo.

gcg is ok, i have my opinions about it but it will make decent power no problems.

[SS8_Gohan]

yeah, i wasn't able to google much on the apexi turbos, but what i did find = $$$$$$$$$$$$$$$$$$$$$$$$

i too have heard good things about the HKS GTR-S

what $ are we looking at for one of those?

[jazza08]

$1800+ 2nd hand

$2500+ new

Includes turbo/actuator/fittings/lines etc

Mates R33 (rb25) has full boost by 3000rpm and 350rwhp on a measley 1.1bar (15.5-16psi).

My old GCG made 310ishrwhp by was fairly laggy on my tired r32 (rb20) running 20psi. Not really a good comparison hehe

Peronsally im going to fork out for the hks turbo, just not for awhile!

Edited April 20, 2007 by jazza08

[Beeble]

^That's 260rwkw. very nice.

Another happy GTRS person here

Response is awesome, I've got mates with bigger turbos on various different flavours of car, and on anything other than the drag strip mine is the quicker all-round package. not quite the same "shove in the back" factor though. If i had the choice again, I'd probably go with the 2835 ProS for the few extra $$, but that's just because i'm used to the power now.

re: GCG Vs GTRS - I researched this a lot, and i'm sure a lot of others have too.. at the end of the day the power outputs are similar enough to be the same; the GTRS maaaay be a wee bit more responsive, but there's really nothing in it.

But remember on the RB25 with that sort of power you're really pushing the limits of the stock injectors, and the stock AFM.

You'll find quite a lot of the guys with these, and larger turbos, have done the PowerFC/Injectors/AFM/Fuel pump upgrade gig.

edit : yep, i've got fuel pump / injectors / AFM / coilpacks / ECU etc ,run up to 17-18psi (but 15psi day to day)

but i DO know of a guy with a GTRS with just a SAFC and no other supporting mods.. he's had it over a year now with no dramas. yet.

Edited April 20, 2007 by Beeble

[jazza08]

260rwkw was on an r33 rb25 and also only on that boost, bump it up a few more psi and abit more aggressive tune and it'll make 270-280rwkw no drama's!

Ive seen 300rwkw with cams but i believe the motor was built.

Erm a GTRS on 1bar wud kill your motor without afm/injectors

I run 276rwhp and on cold nights get up to 94% injector duty cycle!! Pump would of maxed up before then and afm can't stretch much past 300rwhp.

I'd love to see a comparison graph between a 2835 ProS and a GTRS. How much more power does the ProS make and how much more lag?

I like track work the most so the GTRS will be pefecto! hehe

Edited April 20, 2007 by jazza08

[Beeble]

I think as a general rule with the correct supporting mods, GTRS 240-260kw, 2835 ProS 260-280.

Any other takers?

[illusiVe]

Sounds awesome, so at the moment only thing restricting me to get more power is the turbo. What size injectors would you suggest? i WONT be opening the engine or need more than 270rwkw ever. Also are coilpacks required. ill deff do a fuel pump

[Dale FZ1]

ill deff do a fuel pump

I have 225kW and through data logging found the fuel pump wasn't up to the task. Upgrade from stock fixed it.

Make sure you do it too.

[Beeble]

Sounds awesome, so at the moment only thing restricting me to get more power is the turbo. What size injectors would you suggest? i WONT be opening the engine or need more than 270rwkw ever. Also are coilpacks required. ill deff do a fuel pump

Nismo 555's will go straight in and be more than up to the task (well on the R33 they do anyway, i can't vouch for R34s)

You don't need coil packs unless yours are stuffed. I had the stockies for over a year, developed a worsening missfire, went for Splitfires and picked up a few kw along the way - so maybe mine weren't quite up to scratch to start with. You have a newer car so hopefully it shouldn't be an issue.

Log on to Nengun/Greenline etc and have fun shopping

Edited April 20, 2007 by Beeble

[Andi]

Nismo only make 480cc for the GTT, but that she be good for around ~260rwkw at around 80-85% duty cycle. I believe Blitz have a 555cc option and Sard make 650cc and up.

[gtst25]

Hi fellas,

I've got the 2835 pro s - it's making an honest 261rwkw with cams and everything else the norm but I'm unhappy with the boost levels and tune (again!) Boost wise it goes to 18 psi and fades away to 16 psi up the top. I'd be happier running 22 psi that's where it feels a lot better. I doubt I'll run this sort of boost on the stock bottom end though

I think the only problem with the 2835 pro s is the wastegate opens up past 5000rpm so you can't hold your desired boost. I'm waiting for a datalogic as I want to start tuning myself. Here's a few dyno graphs of the pro s - the 341hp and 261 rwkw runs are both mine 341 hp before cams.

Cheers

[TommO]

Hey gtst25,

Perhaps it's a restriction somewhere that's causing that boost drop? I mean, I know they are prone to it, but didn't think they were that bad. For example, check out the dyno sheet (and boost) of this R33 GTS-T with stock motor and 2835ProS:

http://www.skylinesaustralia.com/forums/in...howtopic=164602

Ps. Fark, that's a pretty average tune from the looks of things!!

[illusiVe]

AX53B70 ftw!!

Just bought one

turbo is on its way from japland

big thanks to all who did their part in helpful input

[gtst25]

I've heard that the turbosmart e boost boost controllers like the guy is using in that link are better than the pfc boost control kit as they are a true bleed style boost controller whereas the power fc one is a on/off solonoid valve. It's probably what I need but after awhile you get a bit sick of spending more and more money. I've tried increasing the pre load on the wastegate spring and it seems to just spike higher earlier on and still fall off. User name Grepin had the same problem with his set-up and went to the extent of changing to the bigger ar exhaust housing and putting a stronger wastegate spring in - didn't fix the problem though.

So there you go - by the looks of it you need to goto a bleed type boost control on the 2835 - it can't be a restriction as it's been the same on two exhausts - I have a 4'' magic cat/new trust 3'' exhaust, large blitz intercooler and clean K&N air filter - have also tried doing a run with out the air filter and no top on the airbox and zilch power/boost difference. I've also pullled out the cat to check - it's fine and the dump is hks and down pipe a well made 3''.

It's hard to compare dyno figures between shops - the quarter mile is ok is spose - I've done a best of 12.7 after 6 runs down the strip but that's with 3 grand launches as suspension wasn't the best and no slicks.

Cheers

Hey gtst25,

Perhaps it's a restriction somewhere that's causing that boost drop? I mean, I know they are prone to it, but didn't think they were that bad. For example, check out the dyno sheet (and boost) of this R33 GTS-T with stock motor and 2835ProS:

http://www.skylinesaustralia.com/forums/in...howtopic=164602

Ps. Fark, that's a pretty average tune from the looks of things!!

Edited April 21, 2007 by gtst25