So, I decided to start a new thread on this.  My truck has been running like crap since I installed my 100hp ddp injectors.  I know they set the pop pressure at 290, which is low.  But when it's idling, or driving under light throttle it almost sounds Iike it has a fuel knock.  Not sure what is going on, but is there any reason why I can't pull them and set pop pressure to 320? Not sure if this will help or not.  They are really smoky, which is the nature of them I guess, but it leaves a slight clearly visible haze even driving under lite throttle, so not sure if there are other underlying issues.  Truck does have a airdog 100 and a new vp.

What issues did you have with the DAP besides fuel knock?   

 

Smoke and haze is normal with DDP.    I am not sure if that has gotten worse or not since DAP injectors.  

 

Is there an actual driveablity issue beyond the noise and haze?   

The smoke is much worse with the DDPs. The fuel knock is still there, but not all the time. There is no driveablity issues. Just smokes all the time regardless of throttle. It does not smoke at idle, only under throttle, EGTs are about 750 to 800 at 65mph.

that's DDP,   replace the injectors or the nozzles and repop.  I wouldn't worry about fuel knock

Edited March 10, 20214 yr by Me78569

8 hours ago, Me78569 said:

that's DDP,   replace the injectors or the nozzles and repop. 

Will do. Any suggestions for decent nozzles at a reasonable price?

I would talk to DAP.   they have good budget stuff.    

 

Why did you change from DAP to DDP?   

Like myself I'm still a 7 x 0.010 DAP injector VCO popped at 320 and nearly zero smoke. Initial stomp of the throttle its will smoke some but clears quickly. I just had @Jthor driving my truck home as I followed with a customers vehicle. Still more than enough power to spin the tires loose on dry pavement.

1 hour ago, Me78569 said:

I would talk to DAP.   they have good budget stuff.    

 

Why did you change from DAP to DDP?   

They were used from a buddy and thought they were the causing the issues I was having, but I was wrong. They were definitely better on smoke than the DDPs, so I'm just going to swap the nozzles and re pop the DDPs and call it good

I'd send your DAP's back to DAP and ask them to go over them for you.  It will be cheap and they can fix any issues.  Then throw them back in and sell your DDP's and get back what you can.  

 

@dieselautopower   

Edited March 11, 20214 yr by Me78569

We can go over the injectors and re-pop them.  If they are our injectors we cut labor in 1/2.    Regarding DDP injectors I recommend working with them directly.  They have a good reputation.

2 hours ago, Me78569 said:

I'd send your DAP's back to DAP and ask them to go over them for you.  It will be cheap and they can fix any issues.  Then throw them back in and sell your DDP's and get back what you can.  

 

@dieselautopower   

3 hours ago, Me78569 said:

I would talk to DAP.   they have good budget stuff.    

 

 

I dont have the DAPs anymore or I would, I gave them back and my buddy sold them. So I might just buy some DAP vco nozzles and put them on the DDPs and re pop and be done with it so my truck is not down while I send them to DDP