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Injectors are close to max!

Cristian

By Cristian,
in Engines & Forced Induction

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Cristian Collaborator

Cristian

Posted
Posted

hey guys,

On the weekend I put the apexi PFC in my car, and tonight I got a turbosmart boost controller(mechanical). Im currently got it running 10-11psi and the injectors are at 81.1% they are close to max, and I want to run 12 psi.

What are the standard R33 gtst injector sizes?

Does anyone know if S6 RX7 injectors will fit stright in?

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paulr33 Grand Master

paulr33

Posted
Posted

stockies are 370cc and theyll starting getting near 98% duty about 190rwkw - 200rwkw

as long as they dont sit on 100% for long duration, ie a few seconds its okay

just put it on graph mode with duty and take it for trash and make sure it doesnt flat line at the top. upto about 240rwkw ish is the "safe" limit where you can start to lean out and go bang (or get close to). i see 96% odd peak very occasionally and im only at 170rwkw so it varies but you should be fine, i run 12psi all the time

Dee 33 Community Regular

Dee 33

Posted
Posted

Larger pump and Malpassi here, pushing 240rwkw through standard injectors. Can't safely run more than 16psi though. My turbo wants more damnit :)

What's the point of a 460hp turbo if the car can't pump enough fuel to use the turbos potential? Money is the prob at the moment...

BHDave Grand Master

BHDave

Posted
Posted

S6 rx7 injectors can be made to fit with some minor mods to the bottom screen to allow them to fit into the rail. They are a slightly longer injector but still seal ok. Unfortunately they are only single pintle.

Mine has them in atm, though due to a niggling missfire issue i have no idea what duty they will be running at what max power.

edit: Forgot to mention that the s6 rx7 injectors use a denso plug (rather than a nissan plug) which can be picked up from any old fuel injector specialist. The plug needs to be notched to fit due to the large lip on the r33 rail.

DRFTR33 Contributor

DRFTR33

Posted
Posted

get an adjustable fuel pressure regulator

if you have a power fc you dont need to get a retune

all you have to do is measure your standard fuel pressure

fit your new reg and set your fuel pressure a certain percentage above standard

then go into your injector settings and take the same percentage off each injector

if you take your time and do your maths right you wont have a problem

GTRgeoff Grand Master

GTRgeoff

Posted
Posted
S6 rx7 injectors can be made to fit with some minor mods to the bottom screen to allow them to fit into the rail. They are a slightly longer injector but still seal ok. Unfortunately they are only single pintle.

Mine has them in atm, though due to a niggling missfire issue i have no idea what duty they will be running at what max power.

edit: Forgot to mention that the s6 rx7 injectors use a denso plug (rather than a nissan plug) which can be picked up from any old fuel injector specialist. The plug needs to be notched to fit due to the large lip on the r33 rail.

Wouldn't that be RB20 or 26 Dave?

  • 4 weeks later...
Bass Junky Grand Master

Bass Junky

Posted
Posted

I now need injectors to fit up my high flow.

I need to know what bolts up, and what are the best to use.

I don't want to use the bg suckers, as I would like more tuning resolution, as my car is a daily driver and needs to get resonable fuel economy and blah blah blah

Anywhoo.. think that I will make more than 250 and less than 300 rwkw.

What size should I use, I will never be upgrading from these injectors, as 250+ is quite enough for a rwd skyline.

I don't want to get the HKS injectors as you need a new rail and whatever, I'd prefer a 100% bolt in injector.

Car is an R34 GTT, high flow turbo. I'll run a FPR only to increase base pressure slightly as I understand that bigger injectors need slightly higher pressure to work properly.

All help appreciated.

BASS OUT

Sydneykid Grand Master

Sydneykid

Posted
Posted (edited)
I now need injectors to fit up my high flow.

I need to know what bolts up, and what are the best to use.

I don't want to use the bg suckers, as I would like more tuning resolution, as my car is a daily driver and needs to get resonable fuel economy and blah blah blah

Anywhoo..   think that I will make more than 250 and less than 300 rwkw.

What size should I use, I will never be upgrading from these injectors, as 250+ is quite enough for a rwd skyline.

I don't want to get the HKS injectors as you need a new rail and whatever, I'd prefer a 100% bolt in injector.

Car is an R34 GTT, high flow turbo.  I'll run a FPR only to increase base pressure slightly as I understand that bigger injectors need slightly higher pressure to work properly.

All help appreciated.

BASS OUT

Hi Bass, SARD make a straight fit injector for the Neo, I think they were rated at 460cc's but they flowed a bit more than that at standard pressure (36 psi above boost). They are on 85% duty at 265rwkw, that's at standard pressure. I did try them at 50 psi and the duty dropped to 70%, so there is plenty to go. I stayed at standard pressure though, as I am not keen on replacing all of the rubber hoses with braided ones. Rubber hoses, screw clamps and 50 psi doesn't sit too well with me.

:D cheers ;)

Edited by Sydneykid
mass_iv Grand Master

mass_iv

Posted
Posted

hey Bass, i just went through the same thing with my car i wanted a set of injectors that fit straight in, people were telling me that the nismo injectors are a straight bolt on, but when i went to powerplay imports they told me i need a new fuel rail so i changed my mind and went for the sard injectors with some colars, they fit straight in, but i got a r33 so i think its the same but not 100% sure.

Sydneykid Grand Master

Sydneykid

Posted
Posted
hey Bass, i just went through the same thing with my car i wanted a set of injectors that fit straight in, people were telling me that the nismo injectors are a straight bolt on, but when i went to powerplay imports they told me i need a new fuel rail so i changed my mind and went for the sard injectors with some colars, they fit straight in, but i got a r33 so i think its the same but not 100% sure.

RBInjectors.jpg

The injector on the left is top feed for an R34GTT RB25DET Neo

The injector in the middle is side feed for an R33GTST RB25DET

The injector on the right is top feed for an R32GTST RB20DET or R32 GTR RB26DETT.

Obviously they are physically not interchangeable.

:D cheers ;)

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