Most people have never driven an rb30det, so have no idea what the differences/gains are.
When i built my rb30det, i did it in a way that i would have done if i wanted to build an rb25det. I didn't down-grade to a rb25de head and waste more money. The only extra costs to do an rb30 conversion are as follows:
- rb30 block = $80-$120
- VCT oil line = $100
Not sure if there was anything else, so lets just add another $200 for the hell of it.
Grand total: $400 extra
All other mods would have been done on the rb25, if i chose to go down that path, and would have cost just as much.
How many rb25's make 140rwkw, in 4th gear at 80km/h? (Mind you this is in run-in tune.)
How many 300rwkw rb25's make full boost by 2800rpm?
Every rb25 dyno sheet i have seen is making almost half the power and torque in the low rpm range.
I have posted my dyno comparisons numerous times, so i'll not post them up again , and the low-mid range is mind blowingly great!
Rb30's do not produce greater peak power, just like the rb25 Vs the rb20, peak power is pretty much the same, using the same mods, it's USABLE POWER or the AREA UNDER THE GRAPH that makes the rb30 such an awesome package.
People love taking about "band for buck"; so for less than $400 i have doubled the low-mid range torque and power. What other mod can have such a significant impact for the same price?
PS: My rb30det will have a rev limit set to 8000rpm; the only thing that will change this is if the turbo runs out of puff before then, as i have fitted the smallest recommended turbo.