Chevy and GMC Duramax Diesel Forum - View Single Post

**TYREBOYZ_DEMAXIN** · 05-11-2007, 10:00 AM

the reson guys go with the shim kit is due to the fact if you run a large hp tune it will ask for alot of fuel and when it doesn't get enough fuel the fuel rail psi drops down and if it drops to far down it will give you a 2k rpm governer so with the shim kit it will allow more fuel thru the stock fuel rail..hope this makes sense

i had to do it on my 05 LLY and haven't had a 2k rpm governer since then..

05-11-2007, 10:00 AM	eBay Motors #2 (permalink)
TYREBOYZ_DEMAXIN Diesel Addict Join Date: Feb 2007 Location: Barnesville OH Posts: 4,528	the reson guys go with the shim kit is due to the fact if you run a large hp tune it will ask for alot of fuel and when it doesn't get enough fuel the fuel rail psi drops down and if it drops to far down it will give you a 2k rpm governer so with the shim kit it will allow more fuel thru the stock fuel rail..hope this makes sense i had to do it on my 05 LLY and haven't had a 2k rpm governer since then.. __________________ James TyreBoyz Pulling Team Pulling Truck called Late Nights.05 LLY 3500 EC LB DRW tuned By Idaho Rob. Work truck,06 LBZ 2500 CC SB SRW,tuned by Idaho Rob and PPE at times My Truck now,1987 Chevy 2500 350 tweaked,6" SuperLift,350 V8 bored 60 over,Elderbrock headers Cam and Titanium Rockers,750 Twin Pumped Holley Carb and some other goodies.crank dynos over 400HP.