Maybe. If the stock pump could not keep up on its own, it will always be the weak point in your system.
An O2 sensor and some data logging would tell you what you need to know about whether the fuel system is the problem.
NYTurbo
TY 4 Stroke God
I’d get rid of the second pump, drop a 255lph walboro in the tank and call it good. The Walboro will support 350 hp without issues.
Big_Phil
TY 4 Stroke Master
- Joined
- Feb 5, 2014
- Messages
- 1,182
- Location
- Wasaga Beach, Ontario
- Country
- Canada
- Snowmobile
- Sidewinder RTX LE
2nd pump shouldn’t be an issue with idle. My viper runs that setup and idles like a stocker, but stock injectors with secondary injectors for extra fuel.
Yamarace998
Veteran
- Joined
- Dec 26, 2018
- Messages
- 47
- Age
- 34
- Location
- Mo i Rana
- Country
- Norway
- Snowmobile
- Yamaha nypex mcx 400
Have a catch tank in front to be sure it not run into starvation on WOT so the extra pump feed injectors directly from catch tank. Works exellent, and good to have if you run high hp. Have a bigger turbo then stock. I found the problem, when I installed the new camshaft I have measured the valve clearance without the correct torque on bolts. So when I set torque the valve clearance become to tight. Have now the correct clearance and the idle is stable on 1500 rpm again. Thanks for all the good tips
