# 93 Rx7 Ls2 Project. **URL:** \ **Category:** Builds\ **Created:** [March 18, 2008, 5:45am UTC](https://forums.speedlife.net/t/93-rx7-ls2-project/196180 "2008-03-18T05:45:59Z")\ **Posts on this page:** 1\ **Showing post:** 367
**Author:** ![Quik](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/quik/32/5979_2.png) [@Quik](https://forums.speedlife.net/u/Quik)\ **Post date:** [May 24, 2010, 6:22pm UTC](https://forums.speedlife.net/t/93-rx7-ls2-project/196180/367 "2010-05-24T18:22:55Z")
> [@5/24/08 - OFFICIAL NYSpeed Spring BBQ @ Dunnville Autodrome](https://forums.speedlife.net/t/5-24-08-official-nyspeed-spring-bbq-dunnville-autodrome/42266/56): > > Try to find out. An aggressive cam lobe will wear down springs after a certain amount of time. Its not uncommon to have to change springs every 6-10K miles depending on the lobe. Some can make it longer but you would see power drop off. > > What was the cam used and what rpm? You maybeale to get away with stock springs on a stock cam with boost. Spring rates will vary with cam lobes and valvetrain mass. Boost may require more spring rate and seat pressure to control a lobe over a n/a setup, but its the rpm range and cam lobe design that really determines what springs are needed for any application. setup im taling about was stock cam and stock rpms range. Dual springs should be changed every 10-15k miles if used with an aggressive cam or alot of boost pressure AR will also effect back pressure a 81 would make sense for your high torque number and lack of HP, if you can measure back pressure preturbo it would tell you if that is your issue. .96 will deffently help carry further out, sharp bends in the exhaust will also hurt some but probably not enough in your case. what are specs on cam? you can encounter valve float if you have to much back pressure, your cam along with small AR can be hurting you. Some say overlap is bad but to much neg over lap will shorten your RPM range. I prefer some overlap since it carries alittle better. Makes nicer for topend power --- _[View the full topic](https://forums.speedlife.net/t/93-rx7-ls2-project/196180)._