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What Size To Get?

CAT_SPEW

By CAT_SPEW,
in Engines & Forced Induction

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CAT_SPEW Rising Star

CAT_SPEW

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I am wanting to upgrade my injectors on my RB25 but don't know if 740cc's will be too big..

It's currently making around 250rwkw on about 12.5psi and I'm pretty sure they are maxing out about now.

Will 740cc's be a problem if I have the car dyno tuned after installing them??

I'm looking at making more power later on so I don't want to go too small..

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CAT_SPEW Rising Star

CAT_SPEW

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I was running 550cc and getting 330 rwkw

What % duty cycle were they running at??

Did the car run fine after you installed them, or was it running too rich??

I need to know if I will be able to drive it to the dyno shop after installing them or if it will cause damage..

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blind_elk Grand Master

blind_elk

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Do you have an aftermarket ECU?

As a cheaper option, why not try installing a Malpassi, or similar, rising rate FPR, and increase the base (idle) pressure. Installing huge injectors will cause the car to idle too rich.

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CAT_SPEW Rising Star

CAT_SPEW

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I had a search on google and found some info from Meggala's site on injectors.

Heres the link.

LINK

Going from the 550CC's should be able to support at least 500hp if I worked it out right??

Still don't know if they will screw the engine while I'm driving to the shop to get the tune but..?

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R31Nismoid Grand Master

R31Nismoid

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I was using nismo 740's... i'd reccomend to get those. There were great for me. No issues.

direct fit to the stock rail... (unlike sard)

kept stock reg also (no need for a bigger one)

Using a PowerFC it'll be 100% fine. You'd never notice injectors that big were in there

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