Rb25/vg30 Hi-flow Turbo: Results/comparison

[Bass Junky]

Cam's might have helped, but PFC Boost kit is the only boost risers, plus the ghetto actuator mod to hold the gate closed (as the GCG tends to rattle open a bit)

[benl1981]

Well Ill try the ghetto boost mod to ensure the wastegate isnt creeping open (drill out the holes slightly).

3000rpm is pretty damn good to have full boost!!!

It looks like Im getting about 9psi by 3800rpm in 2nd.

Running a bit rich and probably not optimum ignition timing so maybe I could get thatdown to 3500rpm..

Edited October 10, 2007 by benl1981

[Bass Junky]

no, you don't drill out the holes.

I got a cutting torch and spot heated a bit of the actuator and bent it one way about 45 degrees, then spot heated another bit along the rod and bent it back the other way..... then bent another bit back..... Kinda like the ASCII 'art' below....

.........__

......../...\

......./......\------

PS. Ignore the . look only at the lines...

Edited October 10, 2007 by Bass Junky

[benl1981]

Isn't drilling out the holes pretty much the same deal?

You are effectively shortening the rod and increasing the preload on the spring. Other turbos have an adjustable length rod to vary the boost.

[Bass Junky]

you can drill NEW holes in the end of the rod that attaches to the flapper. I actually tried that......

But boost was, hmmmm, how to I put it....... VIOLENT!

Boost was miles to quick to come on and the EBC couldn't regulate it.

so I changed back to a more moderate ghetto mod

[benl1981]

Thanks Bass - I was going to elongate the mounting holes so that I have some adjustment. Will take on board what you are saying.

[NYTSKY]

IMO i would go and get yourself a decent EBC,for piece of mind,

Bass full boost at 3k is bloody good.I have poncams and still full boost isnt untill 3800rpm.

Mine is a Precision BB highflow,shafts and wheels not balanced inhouse like GCGs but the cartridge(wheels and shaft) are sourced from Garrett already balanced.That is the only difference that i can see.

[benl1981]

I found a vacuum leak (one of the vacuum lines I left disconnected) and Ive just put the turbotech boost controller on.

Will test tomorrow and see if boost comes on a bit sooner..

[benl1981]

Cranked boost up to about 13 or 14psi. Can get that boost by about 3800rpm in 3rd. 2nd is about 4100rpm.

Not reving it past about 5000rpm but boy does it feel like a shove back in your seat as it comes onto the higher boost.

Cant imagine what 18psi +tune will be like. Currently running very rich.

You do have to get into the accelerator a bit more though with this turbo to make things happen

Edited October 10, 2007 by benl1981

[stolen_s15]

Pete what boost is that power figure at? What other goodies do you have that would affect the spool time? Are you running the standard actuator ir is it a 1bar one from GCG?

Cheers

Nick

[Bass Junky]

0.9 - 1.0 bar. Starts dropping at about 5500 rpm.

RB20 Actuator with ghetto mod.

Poncams.

[benl1981]

Forget about the lag - It's not really an issue - I think Im running about 13-14psi. I can't believe the hit it gets

Be careful if there is any wetness on the road. These cars are monsters. 3rd gear.. 3000rpm boost building. about 3800rpm steps sideways as it hits builds to 14psi!!

Not going to push it anymore till injectors then tune. Seriously though anymore than 240rwkw for the road is just plain silly !! Whatever its making now running as rich as buggery is plenty

Well I guess the 170rwkw it was making before at 10psi on stock turbo was plenty also hahaha

Edited October 11, 2007 by benl1981

[Cubes]

Not going to push it anymore till injectors then tune. Seriously though anymore than 240rwkw for the road is just plain silly !! Whatever its making now running as rich as buggery is plenty

Well I guess the 170rwkw it was making before at 10psi on stock turbo was plenty also hahaha

Increase grip.

[benl1981]

Yeah but still - you guys are mad

Edited October 11, 2007 by benl1981

[Cubes]

Give it a week or two. You'll be used to it and wanting more.

[MZTRBO]

I also have a vg30 turbo with r33 hi-flow front..Dont know much about it but it made 235rwkw at 10-12psi.

Ive recently converted the car to manual and taking it back to get retuned..

This turbo comes on really aggresive i love the feel and shove it gets, cant campare it to the stock turbo. Midrange couldnt really be tuned as Im only using a safc.

theres some old threads about this combination of turbos if yous arn't aware, that person had great results also.

Cheers

[MZTRBO]

I get some crazy compressor surge with the turbo though..not overly fussed about it.

Any ideas on this one.

[sloutch]

MZTRBO, if you could give us the link to the person you were referring to in your previous post, that'll be good

[MZTRBO]

Hi Sloutch,

Here is the link I was refering to, good read.

http://www.skylinesaustralia.com/forums/t22706.html

I was extremely interested in the thread as I have an unknown turbo on my car and its seems to be a similar one in the above thread.

Cheers

[Turk]

ummm what is the ghetto mod, I've had my 33 turbo HF/BB through GCG and am going to have the VG30 Housing machined to it, I'd love any advice I can get

cheers