Old article on 275rv injectors.. still ok?

[JAG1]

Would it be better to go ahead and request they go with all new nozzles anyway? 

[dripley]

May be. I did not ask them that. 

[Mopar1973Man]

I'm getting ready to send my OEM stock injectors in and get new nozzles and popped on the high side 310 to 315 bar. Closing in on 100k miles on these 7 x0.0085 injectors.

[jlwelding]

Hey Mike, long time no post. Fill me in on the stock injectors that sounds interesting. I don't run the EZ anymore, all I have is DDP 50hp injectors and they have always had strange miss. I think you mentioned adjust valves, no help there so I was looking to see what was the next best injector to go with.

[pepsi71ocean]

4 hours ago, jlwelding said:

Hey Mike, long time no post. Fill me in on the stock injectors that sounds interesting. I don't run the EZ anymore, all I have is DDP 50hp injectors and they have always had strange miss. I think you mentioned adjust valves, no help there so I was looking to see what was the next best injector to go with.

 

It really depends on your goal with the truck and motor. Closer to stock hp wise. Currently there's a huge discussion/debate about pop pressures and injector sizes. 

 

I have 100s, and I'm getting mine set to 320 bar to see how it clears up the smarty S03. 

 

In all reality anything you do hp c wise with injectors should be backed up by a programmer.

[Marcus2000monster]

2 hours ago, pepsi71ocean said:

 

It really depends on your goal with the truck and motor. Closer to stock hp wise. Currently there's a huge discussion/debate about pop pressures and injector sizes. 

 

I have 100s, and I'm getting mine set to 320 bar to see how it clears up the smarty S03. 

 

In all reality anything you do hp c wise with injectors should be backed up by a programmer.

Why do you say injectors need backedbup just curious? Iv got 75s and a boost fooler. Fairly laggy but not bad power and good mpg 

[jlwelding]

Had to many bad dealings with programmers, just wanting injector hp with out the smoke. Just checking around to see whats new in the injector world. 

[Mopar1973Man]

8 hours ago, jlwelding said:

Had to many bad dealings with programmers, just wanting injector hp with out the smoke.

 

Won't happen. Being the ECM timing curve is way too retard for most driving styles. There are only two tuners that give full control of the timing and fuel curves now. Quadzilla Adrenaline and the Smarty UDC. Hands down the Quadzilla Adrenaline gives the best control of the VP44 for the money. Smarty UDC is way too expensive and way too complex for most people here to even dive into the UDC tuning. Quadzilla with a handful of numbers can create a good tune. 

 

Being that most your time will be spent at about 12* to 14* BTDC timing with just a ECM tune. Now with the Quadzilla I'm floating 20* to 21* BTDC at 55 to 65 MPH. Then problem is once the engine load (commanded fuel) is above about 18% to 20% stock your timing falls off into a blackhole which now creates more EGT's and slight rises in boost pressure which is not needed at cruise state. My current Quadzilla tune drops the EGT's as low as 450*F at 55 MPH and boost falls to nearly ZERO this brings the engine load down as low as 15% (commanded fuel). I'm floating 20-21 MPG now and pushing upwards. 

 

[pepsi71ocean]

14 hours ago, Marcus2000monster said:

Why do you say injectors need backedbup just curious? Iv got 75s and a boost fooler. Fairly laggy but not bad power and good mpg 

The stock ECM timing and fueling map leaves much to be desired. Running larger injectors will decrease duration, but they won't give much more for flow. But having built a bunch of towing rigs over time I have yet to find a larger injector that fixing the EGT's. The higher EGT's tells me that the timing is too retarded across the board. When towing you need a programmer to get back some of your lost timing that you loose with the larger injectors. Its easy to advance the timing and duration with larger injectors, but the stock timing leaves much to be desired.

EDIT: Larger Injectors will still flow the same amount of fuel as meter by the VP-44. Without a programmer you can't compensate for the added fueling. Usually these injectors are also popped lower to allow for more flow, and sooner poop off. This just exacerbates the poor map.

EDIT: It looks like Mike already answered it in a better way then I could.

Edited September 9, 2018 by pepsi71ocean