09-23-2009, 12:09 PM #1
Valve train. Stock springs, aftermarket, etc.
Thinking about doing a Riva ecu to make the switch to turbo easier even though i don't want to up the rev limit. I've heard debates here and there about the different setups but don't know which way to go. I guess these are the options.
-Springs, lightweight retainers, light valves
-Springs, lightweight retainers
-Lightweight retainers, shims
Obviously there is an advantage in price but what about protection against valve float? Is "the whole 9 yards" really needed? Are aftermarket springs with the stock cam over kill?
09-23-2009, 12:13 PM #2
i would do the Les retainers only and leave the rest alone and your good to 8650 rev limit with the Riva ecu...this is my set up now........then later if u do a head job or have it off for any reason and want more rpm just get the stock valves lightened and then u can rev to 9100 with the SAME valve train set up with a different ecu rev limit to 9100 and its the least expense all the way around! BET!!!!!!!!!!!
09-23-2009, 12:19 PM #3
What about the Riva titanium retainer kit?
09-23-2009, 12:29 PM #4
If you want full 8650 RPM then the best way is the full valvetrain upgrade.
No guesswork and no taking chances.
Just adding retainers over the stock springs may work great for high speed passes on flat water but keeping it pinned through chop is asking for trouble.
I know lots of people just install the retainers and have had no issues but if you choose to do this at least replace your valve springs with newer stock springs if your engine has 100+ hours on it. The spring tension tends to weaken over time with the stock springs. I recall Malte mentioning that the 08 springs were updated so if you are going to replace them they would be the ones to go with.
09-23-2009, 12:31 PM #5
- Join Date
- May 2005
- Cumming, GA
The Riva kit is good too but has stiffer springs. With the Les Cooke retainers you don't need stiffer springs or lighter valves until you go past the 8650 rpm limit.
09-23-2009, 12:36 PM #6
09-23-2009, 01:45 PM #7
09-23-2009, 01:55 PM #8
09-23-2009, 02:17 PM #9
the way some guys want to re-engineer stuff it could happen if it hasn't already.
09-23-2009, 03:54 PM #10
- Join Date
- Nov 2006
- Delray Beach, Florida
We have been racing the Riva spring/retainer kit with lightened valves up over 9000rpm all season on 2004 valves with zero issues.
The riva springs do cost a bit of RPM with the increased spring rate, but I like the insurance. With a turbo engine, I can just add 1/2 psi or so and get it right back..
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