Gt35R or gt40R rb20?

[Carryl]

hey guys, recently this summer i fit an rb20det from a skyline gts4 into my s14. Running a custom intake manifold.. a GtR plenum fitted to the rb20 manifold, 3inch intercooler piping, ebay intercooler and a slowboyracing gt35R. Running with an n60 maf..i had lots of trouble correcting it on my super afc and i also had no oxygen sensor on the car ( didnt finish the build had to come back to america for college). The 35R i found spool up to be around 3500 rpm. Im currently in the process of gathering parts to rebuild the engine...and in my mind i want to net 500-600 wheel horse power. My question to you guys is what kind of spool up should i expect from a gt40R compared to a 35R and also do you think my hp figures are possible with the 35R? Carl H has been giving me some advice and suggest a gt3076R but im curious what you guys think.

[Carryl]

this is the car.. its really dirty here...and unfinished ...i intend to post up a swap diary at some point....

[nizmo zilvia]

My build this winter is going to include a GT3076R only because I think its perfect for my new setup. Its a good turbo that spools fast and still gives you that high number.

[Darius]

on an RB20 the GT35 is going to be a dog and honestly 600 hp on an RB20 will be tough without race gas and forged internals. The 3076 is a great turbo for the stock RB25 and will probably work well for the RB20, but the 35R is too big and laggy without other modifications like nitrous.

[Carryl]

as far as other modifications go i do intend on fully building the 20. with forged pistons etc. the only part that has proven impossible to find are connecting rods..

[Darius]

Have you plotted your power goals on the compressor map for the GT35R? or 40R? I'm assuming that you'll have to be running about 30-35 psi of boost or rev the thing to 9000-10000 rpms. I don't know how well that fits on either map, so plot those and see if it is feasible. You can also check out skylinesaustralia.com and I am pretty sure they have an RB20 HP thread.

[sohcslammed]

so where are u seeing full boost on your 35r? id imagine it would be laggy as all get out.

[Carryl]

ok let me be more speicific.. this is the exact turbo i was running

http://www.slowboyracing.com/e...age=1

and i was achieving 12psi from about 3500 rpm.

[Yellow4g63]

ok let me be more speicific.. this is the exact turbo i was running

http://www.slowboyracing.com/e...age=1

and i was achieving 12psi from about 3500 rpm.

What kind of mangment do you have? for your goal your going to need a map system. Quick spool and big hp is kinda hard to do with a 2.0, might want to look into a very good exhaust manifold.