mrgracer

Before there is a big arguement in which is the quickest, are the stock twins reliable? I have heard they are very unreliable and should be thrown out in favor of a single turbo. If this is untrue, please explain. If there are any single turbos out there that are as quick spooling as the stock twins, tell me. All I want is quick spool. I would also be fine with less than 400 hp. It would make it alot easier to understand if you compare the single turbos to the stock twins in terms of spool up time. THANKS !

2manytickets

try the apexi rx6b, I have it made 386rwhp at 14psi with a boost leak from 6k to 7500 rpms, Im sure I would have been over 400rwhp, once I boost it up to 17psi or 20psi I should be making ridiculous power. Spools very fast, quick, and reliable now that the wastegate issue has been corrected.

mrgracer

Is it ball bearing? and what size apex seals do you use?

2manytickets

yes its ball bearing, and I have a stock ported motor with stock seals

rx72c

iTrader: (8)

Use higher compression rotors and standard seals and your spool up times would be better, cause of the higher compression, when i say higher compression i mean s5 rotors which are 9.1:1 or use s6 rotors which have the same compression but are lighter.

BLUE TII

iTrader: (9)

Are you limiting yourself to available kits or available turbos to use in a custom set-up? How much $$$?

Aren't the GT series turbos available in VGT variants?

GEINN FC3S

sorry imma noob, ur saying u can use FD rotors in an FC? wow, barely learning here, hows it run?

fastrotaries

according to all the info i have from Mazda and other published books, the S5 and on rotors are 9.0:1 and weight the same as the S6. Unless Mazda made them different down under. But these numbers are also true for the ones sold in Europe.

mrgracer

Well, I am not really limited in money on a turbo kit, so I will be willing to custom make a kit for the custom price $$$.


Also, where could I get the s5 and s6 rotors, what do they come from, and how much do they cost. I really want the details.

One more ? What is a VGT variant? I am not really strong in my turbo talk yet. lol

BLUE TII

iTrader: (9)

The newer GT ball bearing turbos are available as Variable Geometry Turbine (VGT) housing units as used in the new Ford Powerstroke 6.0l turbo diesel.

VGT uses robust stainless vanes that are hydraulically actuated to clamp down on the exhaust turbine for very fast spool and then fan out for more flow potential once boost is realized.

No wastegate in the system- more efficient.

Have to make/ adapt a manifold, downpipe and VGT vane actuation system.

mrgracer

With VGT what happens if boost gets to high? How does it bleed off, or does the vgt not allow it to boost to that point?

Oh, turbonetics sells them don't they?

bill Shurvinton

VGT increases the A/R to control boost. Effectively you can make A?R so big that it won't spool.

Warning though, maps I have seen are not that efficient (60% or so) and only good for 10PSI or so. Haven't looked at the diesel maps.

milkman2k52

I just wanted to clear this up. Buying a turbo and piecing together parts w/ some fabrication can be cheaper if you look around for the lowest prices and/or buy some used items such as the manifold, intercooler, or wastegate.