SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
#1
|
|||
|
|||
Valvetrain
Well im getting to the tear down stage of my engine for the twin turbo build.
I have decided to go with two journal bearing T3/T4 57trim Garret turbos with .63AR hot sides. That being said I would like to rev a little higher to give me a most usable power band. I am thinking about BC stuff as TOM recommended before but what I would like to know if where will this move my available redline too. If it doesnt move it past the 8000rpm mark then I dont think the cost of the valve train upgrade will be worth it considering we can safely rev to 7400rpm stock. If anyone has any idea if you could shoot it my way that would be awesome!
__________________
1992 SVX: JDM STI short geared 6-speed swap, COBB short shifter, slotted cross drilled rotors, Smallcar Clear headlight lenses, 1997 Grill. 1992 RHD WRX: EJ20G, 16G, Cusco Coilovers, Wilwood 4pot/2pot brakes, Defi Genome 60mm gauges, Exotic speed downpipe, 3.5" A'PEXi spec GT catback |
#2
|
||||
|
||||
Re: Valvetrain
Camshaft profiles will change where you make your peak power, not valves.
The valves merely allow for more lift and oversized valves will allow for surface area. Tom |
#3
|
|||
|
|||
Re: Valvetrain
Quote:
I know that my WRX valvetrain (valves, sprins, retainers) were only safe till 7000rpm. When I upgraded to supertech dual springs, titainum retainers and nitrate valves, my tuner then raised my redline to 8400rpm
__________________
1992 SVX: JDM STI short geared 6-speed swap, COBB short shifter, slotted cross drilled rotors, Smallcar Clear headlight lenses, 1997 Grill. 1992 RHD WRX: EJ20G, 16G, Cusco Coilovers, Wilwood 4pot/2pot brakes, Defi Genome 60mm gauges, Exotic speed downpipe, 3.5" A'PEXi spec GT catback |
#4
|
||||
|
||||
Re: Valvetrain
So you are talking about staving off valve float with stiffer springs??
It all depends on the hardware you chose... If it is good for the profile you want on a 4cyl it should be known that the RPM transfers directly. So in short, try to match the hardware you use to the profile you desire Tom |
#5
|
|||
|
|||
Re: Valvetrain
Thats the answer I was looking for Thanks Tom
__________________
1992 SVX: JDM STI short geared 6-speed swap, COBB short shifter, slotted cross drilled rotors, Smallcar Clear headlight lenses, 1997 Grill. 1992 RHD WRX: EJ20G, 16G, Cusco Coilovers, Wilwood 4pot/2pot brakes, Defi Genome 60mm gauges, Exotic speed downpipe, 3.5" A'PEXi spec GT catback |
#6
|
||||
|
||||
Re: Valvetrain
Shall we go more indepth about what kind of gains there are from the different Valvetrain upgrades and mods? Poticularly things like the converting to Solid from hydrolic, springs, valves, cams, and porting. I think my build is currently gonna just lean heavy on the valvetrain mods to carry the increase I'm looking for with the standalone, MAP sensor, and larger injectors to keep up on the rest.
__________________
94 Bordeux Pearl LSi (Jun 2009) 109k Plate:GADDIS What they call it a vanity-plate. Shouldn't I be obligated to be vane with it? Rota Tarmac 3's 18x8" on 245/40/18 Dunlop SP Sport 600's, Perrin light weight crank pulley, PRW radiator, custom coilovers(not GC's), 9006 HID 4300k 50W low beams, DIY garage door lip, and SVXfiles brake kit. Fixxed exhaust so no more sweet sound. 97 White/Black trim Impreza Outback Sport (March 13/08) 150K-180K(sensor broken)Good news is EZ30R and 05' 6speed full powertrain swap is in motion!: Will be doing more work as I can. Gonna be run by a Hydra so yeah fun to be had. [SIGPIC][/SIGPIC] -Gaddis |
#7
|
|||
|
|||
Re: Valvetrain
Converting from solid to hydraulic? I am not sure if you meant that the other way around. Our lifters are hydraulic lash adjusters. They fill with oil.
I would highly suggest keeping this set-up because solid lifters must be adjusted extremely often. To adjust them you have to get to them. This means the engine comes out. Big pain in the butt to do every couple months. The other popular option are roller lifters but there is simply not enough space in our design to accomodate the roller.
__________________
Cam '92 Ls-L Dark Teal 11:1 CR ECUTUNE pistons ECUTUNE .256 duration intake/exhaust cams ECUTUNE STAGE 2AV1 ECU Z32 MAF/SR20DET injectors Balanced & Blueprinted |
#8
|
|||
|
|||
Re: Valvetrain
Quote:
My 98 RS cam with solid lifters, as do all modern DOHC subarus. Valve lash adjustment has to be done... pretty much never. |
#9
|
||||
|
||||
Re: Valvetrain
Quote:
Converting is a necessity if you want a high RPM engine... The hydroulics bleed out Tom |
#10
|
|||
|
|||
Re: Valvetrain
what would be the benefit of increasing the rpm limits and going with the solids?
|
#11
|
|||
|
|||
Re: Valvetrain
Plus, the hydraulic springs allow very little increase in lift, if that is important to you
__________________
Special Thanks to Our Friends and Sponsors: * http://www.alcyone.org.uk/ssm http://www.PhenixWheels.com http://www.dba.com.au/ http://www.ClassicSoftTrim.com http://ToyoTires.com/tire/pattern/versado-lx Gillman Subaru of Houston "QuickChange" http://www.TransGo.com/ http://www.PlanetSVX.com Bontrager Works, '92 Subaru SVX LS-L Claret ORIGINAL OWNER '92 LS-L Pearl~ '92 LS Pearl~ '92 LS-L Teal~ '92 LS-L Silver~ '95 LSi Polo~ '92 JDM Alcyone SVX Version-L 4WS Pearl~ http://www.subaru-svx.net/forum/showthread.php?t=54143 '92 JDM Alcyone SVX Version-L 4WS Ebony~ http://www.subaru-svx.net/forum/showthread.php?t=54117 |
#12
|
|||
|
|||
Re: Valvetrain
Oops, I misread that and thought he said converting FROM solid. Sorry about that. It is what I get for hurriedly checking in and posting on my break at work.
It would still be nice to have room for roller lifters though...
__________________
Cam '92 Ls-L Dark Teal 11:1 CR ECUTUNE pistons ECUTUNE .256 duration intake/exhaust cams ECUTUNE STAGE 2AV1 ECU Z32 MAF/SR20DET injectors Balanced & Blueprinted |
Thread Tools | |
Display Modes | Rate This Thread |
|
|