Precision Billet Turbos

[ohno1]

What brand and size are your wastegates Simon?

[fatz]

Track I do 21psi

Coffee shop I do 30psi

Basically same set up and stays reliable. You should do the same :-)

3 laps or 30 minute sessions?

[SimonR32]

What brand and size are your wastegates Simon?

Single Freddy 50mm

3 laps or 30 minute sessions?

Coffee shop about 2 min away :-P

But you are right, car does last very well but I don't normally push it for more than 7 min at a time

[czy18e]

Finally had the tune...

So stoked for the little rb25 with 647 hp @ wheels on 28psi.

It actually comes on the converter 200rpm sooner than the to4z.

I need cooler plugs and a bigger wastegate and it should make 700hp pretty easy as the 647 was with early shut off cos of break down and boost creep.

[Lithium]

Very nice, that's with the 6870 eh? What hotside?

[czy18e]

Yep 6870 with split .84

Rev limit set at 8000 but it made that power at about 7500.

[czy18e]

Quick vid of how ridiculously quick it gets on transbrake. Remember it's a 25.

[czy18e]

http://vid214.photobucket.com/albums/cc47/jap2dr/IMG_4017.mp4

[ohno1]

I realise its through an auto with a loose convertor, but when does it start ramping up hard?

[czy18e]

4500rpm compared to 4700 with the to4z

[QUP29]

What was the hotside on t04z?

[czy18e]

.70

[fmlycar]

I am about to go down the 6262 (0.63 rear) path on my rb25. I'm chasing 280kw ish low boost and 320 - 350kw high boost. Engine is built and has supporting mods. Just unsure as to what gate pressure I should run for low boost. Fuel will be 98. Was thinking between 16-18psi low and 20-22psi high.

[Blackkers]

hard to say. with the .63 rear you will have to run more boost to make those numbers.

maybe I'm wrong but 19-20 psi on petrol should ballpark in the 280kw region. If that's what you want to achieve

[Mick_o]

I am about to go down the 6262 (0.63 rear) path on my rb25. I'm chasing 280kw ish low boost and 320 - 350kw high boost. Engine is built and has supporting mods. Just unsure as to what gate pressure I should run for low boost. Fuel will be 98. Was thinking between 16-18psi low and 20-22psi high.

Small rear housing plus 98 isn't a very good idea imo.. I made 288kw on a GTX 3071 on 98. Id look at something smaller than a 6262 for 280kw.

That kinda power can be had on a stock lowmount position kinda turbo.

Big $$$ changing manifolds and plumbing up EWG etc for a laggy 280kw - 350kw IMO.

Edited June 19, 2015 by Mick_o

[fmlycar]

I drove a supra locally here that makes 350kw @ 16psi on a gt3582 with a 0.63 housing on 98. Looking to make 320kw+ in the high boost region, so it must be able to get there if the 3L can do it without it choking. If I have to run a little more boost to get there I will. Just trying to work out what spring I should be running in the gate for low boost to roughly get in the 280kw area.

[SimonR32]

I am about to go down the 6262 (0.63 rear) path on my rb25. I'm chasing 280kw ish low boost and 320 - 350kw high boost. Engine is built and has supporting mods. Just unsure as to what gate pressure I should run for low boost. Fuel will be 98. Was thinking between 16-18psi low and 20-22psi high.

5858 0.84

[fmlycar]

I've already got the turbo, I just haven't fitted it yet. Car is a daily but will see drag use

[Blackkers]

Fair enough. Gate spring don't go lower than 15ish psi as you generally want stiffer and closer to your boost target for better boost control. Only downside is you can't go lower

[fmlycar]

Yeah thats why I was thinking 17psi low and 20 or 22 high and see what it pulls