Upgrade pump or nozzles
- Thread starter Yngdmax92
- Start date
When I had my big tune on my lb7 it would drain the rail with stock injectors. I upgraded to 50 overs with the same cp3 and the truck picked up 4 tenths in the quarter. So unless the cp3 was bad I'd do injectors first.
Injector would be your wise choice. Do you want more power or just take some stress off the engine? Is 3150us your daily tune? Bigger cp3 could do both if your not holding rail on your daily tune. That way you could run less PW and make same/more power because you have more pressure.
Size injectors depends on you end HP goal. 60 overs are going to limit you if you twin your truck down the road, but I don’t know you can do 100overs with a stock cp3.
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Size injectors depends on you end HP goal. 60 overs are going to limit you if you twin your truck down the road, but I don’t know you can do 100overs with a stock cp3.
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3150 is my race tune. I'm looking to take less stress off the engine. I figure staying with a stock cp3 will keep my engine alive the longest as well.
I thought if I got larger nozzles, I could cut the duration a bit and on the back side of things bring back up the psi in the rail.
I thought if I got larger nozzles, I could cut the duration a bit and on the back side of things bring back up the psi in the rail.
It's a good idea to have any oversized injector tested/balanced. We test, calibrate, and balance all our injectors here within less than 4%. Let me know if I can help you out or get you pricing.
Yeah it’s worth $40 and I think everyone needs one to prevent issues later on. I’ve replaced a lot of failed plugs
if your rail plug was popping open youd be in the 11-13k psi range though until you let off the throttle.
Do the bottle test. Pull the little hoop rubber hose in front of the fprv, put a longer hose on the rail side and plug the return side. Put the long hose in a gal jug and tuck under the hood somewhere. Go drive it hard on the big tune and see if there is any fuel in that jug afterward. If there is, put a plug in or shim the fprv. If there isn’t any, that’s not your issue
Ah depends on your goals and location. I ran and still do run stock injectors with a modded pump. 3300pw, 75mm turbo and Modified LLY pump. 700hp and 11.8 1/4 mile ET. Plenty of ways to get it done.