- Location
- Spring Lake, MI
Although its getting late in the season in Michigan, I've been playing with the pump on my superfreak. Current configuration is a healthy jm718 with bpipe and msd enhancer. Stock 144mm pump and 9/15 hooker. Overall happy with the setup, I bored the reduction nozzle to 85mm, and felt a positive difference on getting the motor into the meat of the powerband sooner. I now swapped that over to an RRP trim system and took it out for the first time today. Overall was ok, lost some bottom end but got to feel what trim is all about. Measuring the reduction nozzle at 90mm and the trim/turn nozzle at 86mm. That size seems a bit backwards, as the turn nozzle should always be about 3-4mm larger than the reduction nozzle. On top of that, a 90mm reduction nozzle on a sub 800cc seems excessive. Is there a function to having a tighter turn nozzle? Does RRP assume most guys buying this kit have big motors, so the diameters they supply are already adequate? I'm thinking I can regain my bottom end by machining a sleeve to knock it back down to 84/85mm so I can load the pump up. I've also got a solas 144 pump to swap out as well, but I wanted to test the trim system first to eliminate an extra variable. Thoughts are welcome.
