Ask the Radical Factory #6 – There’s a lot of conjecture around use of noise killing cans like Supertrapps, decibel devils, and so on. Some people say they are not good for prolonged use due to the back pressure, others say it’s fine but will cut power dramatically. Are they ok to use, and if so, for how long? Are there any you’ve tested out in the field which work, and could you recommend any? Thanks, Raj (@rojid)

Hi Raj Correct, there is a lot of conjecture around this subject and exhaust tuning in general. A common belief which is key to this subject is that some back pressure is a good thing and is required to make good low to mid-range torque, this is a fallacy. Think of the engine as an […]

Ask the Radical Factory Question #4 – Hello, I Have a new to me a 2009 sr3 (chassis #438). Two questions I have are where about in the setting range for the dampers is a good place to start for a high speed fairly smooth track (CTMP (Mosport) in Canada)? The dampers are the intrax racing with the single adjustment knob at the top car has medium Nik link bars front and rear. Second what set up difference change between the Michelin and Hankook radical tires? The car came with a set of each, and I am free to run either in the club racing that I am doing. cheers, Corey Bradburn

Hi Corey, as you know the optimal suspension setup is dependent on driver style, weather, and track conditions.  The latest Radical SR3 Owner’s Manual (SR3 XXR) describes good Initial suspension set up for dry and wet conditions.  These set-ups work well as a starting point for most drivers at most tracks, and the Radical Handling […]

Ask the Factory Q#1 – I am writing to you from Japan. I work in automotive maintenance. I am working on a Radical SR4 engine that will not start. The fuel pump and ignition coil are not working either. I want to check if the engine control module is working properly. Can I have a wiring diagram for the Radical SR4 (Chassis No: SR4 00082j) Best regards, Atsushi K.

A:  Hi Atsushi, attached is a copy of the Wiring diagram that will help you with your car.  The SR4 you are working on shares the same engine wiring harness as the SR3, so the attached SR3 wiring diagram should be very helpful in troubleshooting your issue. Additionally, plugging into the Life ECU and using […]