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Gtr Injectors

black sky

By black sky,
in Engines & Forced Induction

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black sky Rising Star

black sky

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Yep, GTR injectors are 440cc.

I know the standard injectors are 440 cc but

will the 550cc be able to do it without needing a fuel pressure reg and with a little head room on top

what i'm trying to say is what do you think the duty cycle will be on with say 350AWKW on the 550cc injectors??

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The Mafia Grand Master

The Mafia

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I have a nismo 275lph pump, and nismo 555cc injectors. They are running 300rwkw, and are at about 80% duty.

I reckon they'd see 320rwkw easily, and more with a FPR up their ass.

But i'd just go for the 770cc Nismos, as they are about $5 more. Also, people on the datalogit user group say they have absolutely no idling troubles with large injectors (up to 1000cc).

770cc Nismos are the best bang for buck IMO. Wish I got them.

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ISC-Performance Veteran

ISC-Performance

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I was going to post up this same topic. Iam getting my car tuned in a few days time and will be aiming for 300-330rwkw whilst using denso 550cc injectors. Ill prob use a FPR though just so I can get a little more out of them. As far as 350awkw you will definetly be pushing it especially without a FPR. If you havnt purchased the injectors yet definetly go the 700cc....

Ryan

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T04GTR Grand Master

T04GTR

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just for referance. i used bosch 650's. with poncams. at .85 bar they were at 75% duty. (i was aiming for 400kw.) with standard cams on 1.5bar they were at 80% putting out 315awkw.

and these are 100cc bigger! id be safe to say 550's on 100% would strugle to safly make over 310.

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SLIPPERY Experienced

SLIPPERY

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770cc Nismos are the best bang for buck IMO. Wish I got them.

What are they going for dollar-wise?

A set of sard 700s were $480 from nengun a little while ago.

Nismos seem to be double that at some places.

For GTR you cant go past the sards if the spray pattern doesnt put you off

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black sky Rising Star

black sky

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What are they going for dollar-wise?

A set of sard 700s were $480 from nengun a little while ago.

Nismos seem to be double that at some places.

For GTR you cant go past the sards if the spray pattern doesnt put you off

Thanks for all the post's guy's i think i'll be going for 700cc injectors

is that what the sard's usually go for?? and are they direct bolt in replacment??

Cheers

anthony

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SLIPPERY Experienced

SLIPPERY

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yeah the sards go straight in. They sit inside the head slightly further than the oem injectors and other after market ones because they are a generic injector. The only downside (this depends on what side of the fence you sit on) is the spray pattern is a little more *squished*, if that makes sense. But by judging by the amount of ppl that use them and the great results they have, then it really shouldnt be a problem. Check out the rb26 dyno thread for proof.

The $480 was when the yen to dollar ratio was the best a couple of months back....i timed it right :P

theyd be low 500s atm i *think* (on nengun)

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The Mafia Grand Master

The Mafia

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Nismos have a much better spray pattern as they are a 4 hole injector.

Also the sards are cheap because you need to get Collars for them, and are usually an extra $200 - $300

They are not a direct replacement.

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TiTAN Grand Master

TiTAN

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The maths to work out how much power your injectors will handle is simple (there are more accurate ways but this is damn close)

(CC of the injectors used) divided by 5 times 6 (the number of injectors used). That calculates how much power at the crank your injectors can handle at 100% duty.

EG.

444 / 5 x 6 = 532hp @ 100% duty at the crank

550 / 5 x 6 = 660hp @ 100% duty at the crank

740 / 5 x 6 = 888hp @ 100% duty at the crank

So running at 90% duty you could make around 480hp at the crank minus drive line losses using the 444's

So running at 90% duty you could make around 600hp at the crank minus drive line losses using the 550's

So running at 90% duty you could make around 800hp at the crank minus drive line losses using the 740's

I have seen 444cc injectors holding 350+kw @ the wheels 12:1 AFR's.

You don't need to run massive injectors to get the power figures you want.

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