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Are 550cc Injectors Essential For 250rwkw In An R33 Rb25det?

Gazee

By Gazee,
in R Series (R30, R31, R32, R33, R34)

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Gazee Grand Master

Gazee

Posted
Posted

Hi everyone,

As the topic states i'm just curious to know wether 550cc injectors are essential to reach the goal of around 250rwkw? Alot of people tell me that its better to get them but i've been offered (quiet often) sets of 440cc S15 injectors new and used. I'm just wondering if i can get away with the 440s and a fuel reg as i'm going to get it tuned pretty soon.

My engine mods are:

GT2876R

Power FC

Fuel pump 040 (or any other suggestions?)

full exh.

I/C

EBC

Z32 AFM

Also i'm only planning to run under 1 bar around 12-13psi.

Thankyou all in advance and I apreciate any input... :)

George

Gazee Grand Master

Gazee

Posted
  • Author
Posted
I've heard from both SK and Hitman that stock injectors and fuel reg are good upto about 240kw. However with a GT2876R it would be pretty silly :nyaanyaa:

Yea thats true, but i suppose you need to look at the condition of the standard injectors aswell if your making that power. When I buy injectors they'll be brand new as much as 2nd hand ones are tempting but i just wont want to take that risk on the motor.

Has anyone heard much about the SARD 550's at all? They are going cheaper than usual at the moment for a decent injector and i'm sort of considering buying them, otherwise i've found brand new set of S15 440s for a couple hundred cheaper but just not sure. Thanks again for the input everyone, all is apreciated.

Trooper Experienced

Trooper

Posted
Posted
Yea thats true, but i suppose you need to look at the condition of the standard injectors aswell if your making that power. When I buy injectors they'll be brand new as much as 2nd hand ones are tempting but i just wont want to take that risk on the motor.

Has anyone heard much about the SARD 550's at all? They are going cheaper than usual at the moment for a decent injector and i'm sort of considering buying them, otherwise i've found brand new set of S15 440s for a couple hundred cheaper but just not sure. Thanks again for the input everyone, all is apreciated.

I am making 252rwkw with stock injectors with out a problem. I have sold (pending payment) my 555cc injectors and will buy again when I do a rebuild for the next stage.

Gazee Grand Master

Gazee

Posted
  • Author
Posted
I am making 252rwkw with stock injectors with out a problem. I have sold (pending payment) my 555cc injectors and will buy again when I do a rebuild for the next stage.

Thats pretty good dude, but yea i just don't know my car well enough to trust it with standard stuff when its going to be making that sort of power. I suppose every car is different and react differntly to certain things you do to it. But no chance i'm using my standard injectors when i go for the tune.

Trooper Experienced

Trooper

Posted
Posted
Thats pretty good dude, but yea i just don't know my car well enough to trust it with standard stuff when its going to be making that sort of power. I suppose every car is different and react differntly to certain things you do to it. But no chance i'm using my standard injectors when i go for the tune.

i would rather have them in the car to be honest, but the tuner did not want them in, said to do it next time and i need the money for other things now...

  • 5 weeks later...
gtst25 Proficient

gtst25

Posted
Posted

Don't know how you'll go getting 240rwkw @ 12-13 psi. I would've thought you'd need 15psi plus. 440's will do it fine - I've got 550's and 250 rwkw and they're only at 60%.

Cheers

Gazee Grand Master

Gazee

Posted
  • Author
Posted
Don't know how you'll go getting 240rwkw @ 12-13 psi. I would've thought you'd need 15psi plus. 440's will do it fine - I've got 550's and 250 rwkw and they're only at 60%.

Cheers

Yea well you never know what happens on the day of the tune, besides who knows exactly how much kw cars push most dynos give you a higher figure than what your car really has.

For example, I tuned my car with my safc @ chasers, i only had full exhaust system, fmic, bleedvale @ 12psi (that didn't even hold boost properly), pod filter and thats about it, the dyno sheet said 214.9rwkw, now thats hard to belive....

Every cars differnt but i'm just saying if i dont get upto 240kw on that much boost i dont really care anyway, i'm not after a power figure i just want everything to work the way its set up to... And with the turbo i've got and the setup i've got i just want everything to complement everything else. I just want to be on the safe side really, but seems like 550s will be the safest choice ey...

datto260Z Experienced

datto260Z

Posted
Posted

Thats why shootout mode was invented, so I would have the same power readout in Canberra as someone in Sydney. Because things like different atmosphere and temperatures and the like.

Gazee Grand Master

Gazee

Posted
  • Author
Posted
Thats why shootout mode was invented, so I would have the same power readout in Canberra as someone in Sydney. Because things like different atmosphere and temperatures and the like.

So how can it be deadly accurate? A lot of people i've spoken to have said its rare to get a place to dyno your car that will give you a 100% accurate reading... is this true?

Gazee Grand Master

Gazee

Posted
  • Author
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DD Shootout Mode doesn't improve accuracy so much as it improves parity between different dynos.

Ahuh... so how do you get a 100% accurate reading? or is it impossible cos theres 2 many factors that could effect it? wheel spin and all that shit?

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