[SCCAForums]

Hi Guys, as the title of the thread states, I'm actually just looking to do the Gotboost 3" intakes and an HKS Offroad (no Cats) midpipe. Can the 2014 GTR stock injectors flow enough fuel for the added increased air, and increased exhaust flow?

Still will have the stock down pipes.

Appreciate your input.

Dave

 

[tjlazer]

up to 16psi for all GT-Rs. 2014's is no different. More than that and more mods and stock injectors tap out.

 

[R35 Dan]

I was planning on some downpipes but told I need upgraded injectors and fuel pump

 

[5252turbo]

Always good to change out injectors and pumps and add flex fuel kit very cheap mods but big increase over stock !

 

[Goonthree]

I had that setup 4 years ago and car cut off at 165 mph in the summer!!! The other support mods such as injectors are cheap. No need for pumps unless you do e85

 

[SCCAForums]

up to 16psi for all GT-Rs. 2014's is no different. More than that and more mods and stock injectors tap out.

Ok thanks, I read that '14's received an updated injector, didn't know if was better or worse than prior ones? Are you saying, the stock injectors can handle the intake & midpipes? Or no? I am not going to do e85 or other mods.

[background=rgb(246, 246, 246)]I had that setup 4 years ago and car cut off at 165 mph in the summer!!! [/background]

What exact mods did you have? And what altitude?

Best Regards,
Dave

 

[tjlazer]

Yes on intakes and midpipe you can stay with stock injectors and stock pumps (only needed for E85). I ran that for almost a year and could not go higher than 16psi without hitting 100% Injector duty cycle. But the car ran well and was a great point to stop if you don't want to go all out.

When I added a Switzer 90mm cat back I hit 105% IDC. Next mod was catless cast downpipes and I was planning on injectors soon after but wanted to see what my IDC was and it was over 120%! I scaled it way down for the meantime and installed 1050cc injectors a week later...

 

[Goonthree]

3" intake, aam resonant midpipe, Tonabe catback and Cobb with custom tune. At sea level

Ok thanks, I read that '14's received an updated injector, didn't know if was better or worse than prior ones? Are you saying, the stock injectors can handle the intake & midpipes? Or no? I am not going to do e85 or other mods.

What exact mods did you have? And what altitude?

Best Regards,
Dave

 

[SCCAForums]

Thanks guys! Do the bigger injectors allow a car with intake and exhaust to run more boost than another car with same intake and exhaust, but stock injectors?

Meaning if 16psi is max for stock injectors with 3" intake and mid pipe, would 1100 cc and same mods allow for 17 or 18psi?

Best Regards,
Dave

 

[tjlazer]

and 2014's have the same injector size as all GT-R's.

 

[bse]

Yes you can run more boost. But after about 6000 rpms your boost will taper down to around 14 psi by redline do to turbos maxing out on flow.

 

[Malakas]

Great thread. Asking myself this exact question as I look to get 3" intakes to compliment my Quadzilla mp.

I'm going to get injectors next mostly because I've read (and someone please chime in if this in inaccurate) that the stock injectors have inconsistent performance near 100% IDC.

I'm looking more for a reliable power setup than a max power setup so injectors seem to make sense...

 

[SCCAForums]

and 2014's have the same injector size as all GT-R's.

Yes, but according to the press release they had been revised for better response and mid range power.

 

[blumenthal1]

What are the cc on stock injectors for a 2013

just living the dream

 

[bse]

570cc

 

[blumenthal1]

Thanks ........ so l should definitely change them

just living the dream

 

[gta88ws6]

Most injectors on any car are considered maxed out @ 90% idc, they are considered static (open100% of the time essentially)

Sent from my HTC6535LVW using Tapatalk

 

[tjlazer]

Yes, but according to the press release they had been revised for better response and mid range power.

If you do a search it turns out this was NOT the case. From the 2008 JDM R35 to the 2016 GT-R's, they are all 570cc.

 

[gta88ws6]

Maybe different nozzle or patern plate?

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[SCCAForums]

Here is the info from the original press release of the '14 GTR:
New fuel injectors are adopted for enhanced torque response in the 4,500 - 6,000 rpm range, improving throttle and acceleration feel at mid- and high-rpm ranges. Also, an oil pan baffle has been added to stabilize oil behavior and oil pressure under high performance driving conditions. The baffle reduces rotational friction, which contributes to the increased responsiveness.