# Evo 9 RS vs. Arod hatch **URL:** https://forums.speedlife.net/t/evo-9-rs-vs-arod-hatch/243771 **Category:** Shift518 Automotive **Created:** [April 26, 2009, 11:39am UTC](https://forums.speedlife.net/t/evo-9-rs-vs-arod-hatch/243771 "2009-04-26T11:39:33Z") **Posts on this page:** 1 **Showing post:** 111
### Author: ![Mk4\_30R\_Ban](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mk4_30r_ban/32/6347_2.png) [@Mk4\_30R\_Ban](https://forums.speedlife.net/u/Mk4_30R_Ban) #### Post date: [May 1, 2009, 9:22am UTC](https://forums.speedlife.net/t/evo-9-rs-vs-arod-hatch/243771/111 "2009-05-01T09:22:51Z")
> [@rude people/work rant](https://forums.speedlife.net/t/rude-people-work-rant/17703/9): > > There’s really no such thing as a “tune” for nitrous. Nitrous is completely stand alone. It doesn’t care what you have done to your car. Any car that is planning to have nitrous added to should be tuned prior to the N2O installation. The nitrous itself is tuned by changing the jets. You want to maintain the same AFR that the tune on the car is making prior to the installation. (or sometimes a little richer) i know how it works, but thats not always the case. take for instance, the K20 guys that are spraying. alot of them use K-pro. and they have a flip switch map for the nitrous where timing is pulled and fuel is ADDED by the injectors, and not by the fuel jet. its a direct port system, set up as a dryshot, compensated through the ECU/injectors to run as a wetshot. --- _[View the full topic](https://forums.speedlife.net/t/evo-9-rs-vs-arod-hatch/243771)._