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Gtr Injectors On Rb20 - How Do I Correct Power Fc?

abu

By abu,
in Engines & Forced Induction

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abu Grand Master

abu

Posted
Posted

Hey

I installed a set of GTR injectors onto my RB20 and am just wondering if someone can tell me how to correct the Power FC so I can drive the car to the tuners?

What settings do I need to go into and what values do I need to put in or even how to calculate the correction and I will work it out my self

Can I just go into the INJ correction section on the Power FC and put the values down from there?

Standard injectors are 270cc and GTR injectors are 440cc

Any help would be appreciated

:)

BOZ22N Grand Master

BOZ22N

Posted
Posted

Can remember the way of the top of my head but it is setting> then fuel correction or somthing you will have to have a look. Your old injectors are 61.3% the size of your new ones so pull all the injectors down by 30% to be safe and it should be ok if you dont have to drive too far just dont flog it NO BOOST, just keep an eye on you knock level.

Good luck

abu Grand Master

abu

Posted
  • Author
Posted
Can remember the way of the top of my head but it is setting> then fuel correction or somthing you will have to have a look. Your old injectors are 61.3% the size of your new ones so pull all the injectors down by 30% to be safe and it should be ok if you dont have to drive too far just dont flog it NO BOOST, just keep an eye on you knock level.

Good luck

Thanks man, I will give that a try

what sort of powerfc do you have?

Its an AP engineering Power FC to suit RB20DET with hand commander

abu Grand Master

abu

Posted
  • Author
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Okay I had a look and this is what I got according to your table

Old SIZE / New Size = Correction

260cc / 444cc = 58.558%

New Latency - Old Latency = Latency Correction

0.772msec - 0.89ms = -0.118

What settings do I got into on the Power FC to enter these values?

RaZ_TuRbO Community Regular

RaZ_TuRbO

Posted
Posted

I dont know if its similar, but using my safc2 i calculated -31% up to about 5500rpm where i went -29% to be safe, and guess what first run on the dyno 12;1 afrs to 7800rpm.. bit of a fluke really.

I think you will be safe tuning it down at least -25% as the flow difference is like 38% more compared to 270cc.

Cheers

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