Jump to content
SAU Community

Recommended Posts

Revs, PSI and cam profile are the three biggest/ if the only factors when considering valve spring upgrade

I don't see how power makes a difference

Generally Jap and standard cams have a pussy profile so a stronger spring is less required

I realise that......but FWIW, most people intent on running 20 psi put on a turbo big enough to do 20 psi at the best flow/most response they can get. People wanting to make more power will put on a turbo able to do 30 psi at the best flow/most response they can get at that level. etc. Doesn't matter if it's a HG highflow, HG replacement, Garret GT/X, Holset, whatever. At any given power level, the most appropriate current turbos (let's ignore old tech turbos) from different sources are all approximately the same thing. If you stray off that line then you're choosing something that is either being run below its best boost for the flow or below its best flow for the boost.

Edited by GTSBoy

Next we will be dragging out compressor maps to see where our valves will float.

The point is, power itself doesn't influence where or when this issue will arise.

Boost, revs and ramp rate of the cams are it. If the engine makes 200 hp at 15 psi at 6500 rpm and it floats, why would it float earlier with 600 hp at 15 psi at 6500 rpm?

  • 6 months later...
  • 1 year later...
7 hours ago, CHRIS MW33 said:

hey any updates on this topic? how have the Performance Valve Springs held up over time for the rb25det neo? also any other spring manufactures other than ferrea trusted for the NEO?

Mine have been in for 6-7 years with the car doing around 15-20 track days a year on top of many KMs of street driving before it was made into a dedicated track car.

Never missed a beat with the Performance Valve Springs! Good gear :thumbsup:

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • I'm normally copping my own abuse from neglecting my daily drivers. "Those suspension bushes will last a bit more", "Don't worry about the oil leak, just keep topping it up". The project cars I'm always doing things slowly on them as I'm wanting them to be done better, and neater, and nicer. Luckily I don't have to deal with 18 year old Matt's "Learning to wire" stuff in the project cars. And there's only one piece of wiring I'm displeased about in the Landcruiser, and it's about to be cut out... However, the box loads of parts that have been going through this place lately for the Landcruiser... Brake pads Brake Rotors Full handbrake overhaul Wheel Bearings Seals Swivel hubs Steering Boxes Half the suspension joints Shocks Air bags (Ones to go in the rear springs for towing) Water pump Timing kit Lower timing case Harmonic Balancer Radiator Lots of other little seals and shits Gas struts for the bonnet New power window switches And god knows what else I've forgotten... Ha ha ha I have my fingers crossed the pinion seals don't start leaking on the diffs, that the transfer case doesn't leak, and the gearbox input shaft doesn't leak, nor the rear main seal. As they're about the only seals I haven't replaced in the driveline! I'm seriously eyeing off buying new caliper rebuild kits front and rear brake calipers... I'll probably recheck all the valve clearances soon too, and hopefully, it should be all good and sweet to haul some long distance trips again!
    • Every time I pull my 3x gauges out of the console and see the crack-addict way that I did the wiring, and I just can't bring myself to tear it all apart and "make it nice", because it is currently working. In fact, the last time I was in there I probably made it worse.
    • The best part is when you own the car long enough that you look back and find your OWN ham fisted amateur shit!
    • The annoying part about neglect, is when you start to replace one thing, and find ten more broken things. Ham fisted monkey repairs you normally only find out about when trying to do something unrelated! Ha ha   Neglect you can kind of anticipate the huge costs to fix it all. Ham fistedness is normally a shock the first time your work on a new old car, as everything "looked" good before.
    • For DBA, check out their guide table here. https://dba.com.au/wp-content/uploads/2023/01/Direct_Replacement-Guide-2021.2.pdf   Additionally they have some other guides and info on how to make sure you choose the right pad.
×
×
  • Create New...