I like the right angle idea for added support. I did screw the wood into the trailer but you make a good point.
1 Like
The engine will run a little slower under load. So with a high pressure tip your gpm will be a little bit less than with no back pressure
1 Like
Makes sense 
I believe this boils down to is this. 8gpm of flow @ zero psi can be done with gx160. 5.5hp. Probably less. As you add back pressure, with the tip, the flow will decrease. More horsepower is needed to overcome the back pressure. As u put a smaller hole (tip) for the water to go through it takes more power to push the same amount of water through the smaller hole. In order to get more pressure we put a smaller tip on and the smaller it is the more back pressure you get. And the more power is needed. I’d be willing to bet an 8gpm pump and a gx200 would make a great 5-600psi house wash setup. I just may try that this year.
You might have trouble using a ds injector at that pressure.
@Infinity. I was thinking that also. I guess I could crank the pressure down on my 6gpm and test that out. I assume it takes a pretty good pressure differential to make the injector work.
1 Like
IIRC, somewhere around 250-300 psi. But you also have to consider the pressure loss through your hose and plumbing. At 8gpm, I think you lose at least 200-300 psi for 200’ of hose. So yeah, I kind of doubt if an injector would pull well with 600 psi and a decent amount of pressure hose.
And once again binged has to tell me what IIRC means. Surely I’m not the only one that doesn’t know what all these abbreviated terms mean?
3 Likes
If I recall correctly ( I had to bing it 
)
1 Like
At first I thought it meant laughing loudly something something. Why don’t key boards make capital I’s anymore? They make lowercase L’s instead
2 Likes
I never knew what that meant. I never would of guessed that. I thought is was somebody’s name. Lol
1 Like
Kinda of in the same ballpark, even if it is left field.
I have 8 gpm/3500 rig. Normally I run 150 ft hose - first 50 ft is 1/2 inch and then 100 ft at 3/8 inch. Not sure if it matters but both are two wire hoses.
Today, I had to add my back-up hoses which are single wire 3/8 inch hose. Added 100 ft. At the gun, it was a noticeable difference in force. I can one hand with 150 ft of hose on the gun/wand but it takes some strength. With the additional 100 ft hose added today, it was way easier. How much pressure am I really losing with the additional 100 ft hose added?
300 psi
1 Like
Thanks @Innocentbystander
I would have guessed more, just off the feel of it.
There are variables based on how much the hose has been crushed, whether you lead with male or female couplers yada yada, but that’s what the math equation works out to.
