11-22-2012, 08:35 PM #1
Potential Rev Limit - Stock Valvetrain with Ferrea Valves
I have an 06 RXP and will be getting a Vtech map in the next few weeks. A while ago I removed the stock valves and replaced them with Ferrea lightweight valves for reliability. I left the rest of the valvetrain stock. I have done a search and can find plenty of info on potential rev limits with springs and retainers (or retainers only) but cannot see any reference to what rev limit I could run with valves done only. I plan on upgrading to the supertech valvetrain in a while, but in the meantime I need to know which rev limiter to specify. I was thinking 8500rpm? I am sitting on the rev limiter at the moment after a recent X charger upgrade so this would give me some headroom instead of pitching the prop.
11-22-2012, 09:56 PM #2
Not sure of the rev limit on a 06 but if your prop is pitched correctly that's an easy 2-6 mph bump.
I've seen as little as 2-6 mph on every pitched prop.
Pm me if you want my mechanics #
11-22-2012, 10:56 PM #3
I think the general consensus is 8400 without springs/retainers so I would keep it close to that. You can always swap your maps later on. IMO grab the supertech spring/retainer kit when you have the funds.
11-22-2012, 11:13 PM #4
Cheers mate, I will stick to around 8400. Once I get the springs/retainers I can up the rev limit from there. I know I could pitch the prop at the moment to be off the rev limiter but I am planning more mods in the future so the Vtech will be good to get off the rev limit now, as well as have it there for future maps etc.
11-23-2012, 12:32 AM #5
I think with light weight ferrea valves you can go more with stock springs - i know les runs stock springs with lightened valves higher (but probably with titanium retainers)
11-23-2012, 12:43 AM #6
11-23-2012, 12:48 AM #7
- Join Date
- Sep 2009
- Aussie Land
Supertech valve springs and retainers: best bang for buck.
I've rev'ed mine to 9100 on holeshot and they still seem to be ok
The rev limiter is now 8700 with excursions to 8940.
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