R34 GTT Rebuild - Manifold/Turbo Advice

[niZmO_Man]

2 hours ago, Dose Pipe Sutututu said:

^ yep!

then buy proper tyres, a proper LSD, proper suspension arms to fix up the crappy Nissan rear geometry.. If you can't even put 200kW down to the ground, don't bother with power upgrades.

But if you're single pegging everywhere, who cares brah! 300kW uleh.

[Dose Pipe Sutututu]

wallah!

shuuuu cuz, look brah.. fries 3rds with 200kW

[macca911]

On 9/16/2016 at 10:50 AM, Dose Pipe Sutututu said:

^ yep!

then buy proper tyres, a proper LSD, proper suspension arms to fix up the crappy Nissan rear geometry.. If you can't even put 200kW down to the ground, don't bother with power upgrades.

The later model 34 GTTs have a Helical Diff yea? Is it worth the upgrade providing this is in a healthy condition? 
I do plan to take her to the track, I'm assuming a true 1.5 way would be better... 

Edited September 18, 2016 by macca911

[GTSBoy]

For street, a helical is pretty much the nicest diff.

For track, a proper mechanical diff is better.  Especially if you have really high roll stiffness - where you may lift the inside rear wheel off the ground - or if you tend to hit kerbs hard enough to do the same.  Getting a wheel up instantly converts a helical into an open diff.

Also S2 R34 helical diffs are like hen's teeth and if you find one I would prefer you let me buy it.  Or at least the 5 bolt stub axles from it!

Edited September 18, 2016 by GTSBoy

[jet_r31]

Atr45sat hypergear on a havoc modded stock

Ex manifold with one 50mm  ex gate

Theres you cheap and cheerful setup

Cheers

Darren

Edited September 18, 2016 by jet_r31

[Rekin]

Am watching thread with much interest - just pulled apart a wrecker Neo engine for an inspection & rebuild (post results)

[kolaxjason]

Have brand new tomei 256 pon cams for Neo if you're interested pm me

[macca911]

On 9/16/2016 at 1:53 AM, hypergear said:

lets say. I can get you 3582's power with better then 3076's response. and much cheaper in price.

Hypergear, I'm listening... Would this be something like the Atr45sat?
Internal or external gate? 

Cheers,  

[hypergear]

Thats the latest ATR45SAT RV2 model in ceramic ball bearing center. Is maxed at 330rwkws on 22psi p98 fuel internally gated Bolton, 20psi by 3650rpm, unopened neo motor.  Run that externally gated e85 it will be making around 400rwkws region. Check my fb or dyno sheet section for result.

[macca911]

Gents,

It's been some time since my last post. 
The car has been finished and it made a super responsive 625rwhp and 680nm (e85)

I went with the following setup: 

• JHH Built RB25 Neo 
• EFR BW 7670 1.05 TS
• 6boost Manifold with twin gates.
• 2000cc Bosch Injectors
• Haltech Platinum Pro
• Hypertune Plenum + TB 
• PWR Intercooler and Oil Cooler

I can't recommend GT Auto Garage at Slacks Creek enough.
Their attention to detail in both fabrication and tuning is fantastic!  

Still running the stock gearbox...

 

Cheers, 

[KiwiRS4T]

Overshot your target by more than 100kw! Sounds like fun.

[Dose Pipe Sutututu]

@Kinkstaah I thought you said the EFR7670 was laggy on your ex RB28?

[Kinkstaah]

It turns out every car I drove after mine felt like an absolute dog.

The EFR smashes the GTX3071 in every aspect.

I have unrealistic expectations for response it would appear relative to 100% of RB's ever built. I would assume that a 2.5 with a 7670 would be laggy, or at least laggier than mine. Still going to be better than anything else bolted to a 2.5.

The result does backup my thinking on the matter, that the 7670 is actually a pretty big turbo and is more a 450kw turbo than a 350kw turbo that people seem to consider it to be. Would be curious to see if there is speed sensor data as 466rwkw is really up there.

[Lithium]

On 7/3/2018 at 12:04 PM, macca911 said:

Gents,

It's been some time since my last post. 
The car has been finished and it made a super responsive 625rwhp and 680nm (e85)

I went with the following setup: 

• JHH Built RB25 Neo 
• EFR BW 7670 1.05 TS
• 6boost Manifold with twin gates.
• 2000cc Bosch Injectors
• Haltech Platinum Pro
• Hypertune Plenum + TB 
• PWR Intercooler and Oil Cooler

I can't recommend GT Auto Garage at Slacks Creek enough.
Their attention to detail in both fabrication and tuning is fantastic!  

Still running the stock gearbox...

 

Cheers, 

Very nice!  Can you please share the dyno plot?  The peak power is solid, but not the most interesting part of that setup

[macca911]

Kinkstaah Unfortunately I don't have a speed sensor installed. It's coming... 
I have to agree, it must be pushing the limits!! 

KiwiRS4T, It wasn't intentional... I've now got concerns for the gearbox etc... Matter of time haha.  

E85 run attached. I believe the dip at 5400 would be VVT... Please correct me if I'm wrong. 
Unfortunately, I'm in the US and only have the 625hp/640nm run photo on me. You'll get the idea though.
The final power run video is on the GT Auto FB page. 

As always, bugs to iron out and more mods to do.
At this stage, I've planned as far as brakes and an accusump setup in the coming weeks... 

 

[Dose Pipe Sutututu]

I would log your RPM vs. time, I wonder if the VCT turning off is causing some form of timing belt slap/vibration thus causing the CAS to spaz out.

That would explain the harsh dip

[Lithium]

52 minutes ago, macca911 said:

E85 run attached. I believe the dip at 5400 would be VVT... Please correct me if I'm wrong. 
Unfortunately, I'm in the US and only have the 625hp/640nm run photo on me. You'll get the idea though.
The final power run video is on the GT Auto FB page. 

As always, bugs to iron out and more mods to do.
At this stage, I've planned as far as brakes and an accusump setup in the coming weeks... 

The dyno run attached does look quite a bit like it could be VVT turning off too early, I'm assuming that's sorted now?   

Saw a post on NZ Wiring's workshop page of a very similar setup/workshop which upgraded to an NZ Wiring CAS setup on an RB25 Neo recently, wasn't you by any chance?  Very solid delivery for an RB25 making that kind of power, though.  Should be a fun drive

[macca911]

6 minutes ago, Lithium said:

The dyno run attached does look quite a bit like it could be VVT turning off too early, I'm assuming that's sorted now?   

Saw a post on NZ Wiring's workshop page of a very similar setup/workshop which upgraded to an NZ Wiring CAS setup on an RB25 Neo recently, wasn't you by any chance?  Very solid delivery for an RB25 making that kind of power, though.  Should be a fun drive

Nah, not me. I'll take a look though! 
Not sorted yet... Mainly due to work commitments. I'll aim to spend some time on it starting next week.

Edited July 4, 2018 by macca911

[Lithium]

3 minutes ago, macca911 said:

Nah, not me. I'll take a look though! 
Not sorted yet... Mainly due to work commitments. I'll aim to spend some time on it starting next week.

(y) This is the post that got my attention btw: https://www.facebook.com/nzwiring/photos/a.263208990533912.1073741827.263205613867583/915378341983637/?type=3&theater

[Dose Pipe Sutututu]

big power, noisy valvetrain and Nissan's high resolution optical sensor (CAS) never works out well haha

VCT "shouldn't" be giving you a massive dip, I dare say (without any data) that there may be triggering issues