Another One Of Those Turbo And Engine Combination Questions

[warpz0r]

I cannot read dyno charts so im not too sure where i would be looking

Engine is a rb30det. 3", front mount, power fc and the turbo will be a kkr 480

can anyone maybe plot on the rb25 with kkr 480 graph where it should be with my setup?

or when i should start boosting and reach max boost?

just estimations...

thanks

[R31Nismoid]

Very hard to say as there isnt a lot of information around.

If you have a look in the KKR thread that i've seen you post in.

You will see that they are a little less responsive than similar sized/priced turbo setups.

There are a few graphs in that thread now, bearing in mind they are 2.5ltr motors and not the same as yours.

Obviously it would be more responsive on a 3ltr as opposed to the 2.5ltr, without a doubt.

How much however is hard to say

Maybe 500rpm... maybe more.

It depends on cam choice, timing and a lot of other variables like Comp Ratio etc.

I would have a stab, and a rough stab, that the KKR480 would come on around the same as a GT30 on a 2.5ltr based on the limited information that is avaliable.

There are loads of GT30/RB25 graphs in the sticky thread in this section that will give you a better idea

Are you using a stock RB25 head? Or do you plan on having cams etc?

[warpz0r]

std cams....

rb25det head

the tubo should come on a bit earlier then... but atleast its a steady increase and pull til redline... hopefully it should help with keeping traction

[R31Nismoid]

It will definately be earlier, how much is hard to say.

It might not be traction friendly though.

in the other thread teejay quite rightly said it seems to be a light-switch style power delivery.

It would be more liner on the bigger motor, again, hard to say how much.

Is it a build bottom end?

[warpz0r]

bottom end has been rebuilt using casties....

rods and stock and so are pistons - just cast coated... i only want 250rwkw, and i will keep it under 6000rpm... budget buildup

daily driver...