Hi all, Looking for the most injector I can handle with my HX35 (with boost elbow for max efficiency without EGT worries. I tow up to 12.5k max mainly @ sea level with a few trips to the Sierras every now and then. Would like to hit about 325-350HP max RWHP and be able to hold a long mild hill @ 55-60mph and have EGTs stay in check.

I've considered RV275s but am leaning toward Mach 1 or 1.6s because of their reputation, feedback, low EGTs and mileage but I fear the 1.6s might be a little much. When towing the trailer I feel I could use "just a little more" to feel fully content when towing; unfortunately, I don't what that "just a little more" is.

So, thanks for checking this out, all opinions welcome.

Thanks very much, Mike.

 

Personally, unless your lookin for competition truck you can't beat the 275's. by far the best injector for the money.

 

with my hy35 edge juice and some 40hp injectors I hit 357. and the driving egts were cool. can't beat them. actually I am going to get bigger as the 40hp ones I just had rebuilt are not enough fuel for my s300 62/71/14. so they will be for sale soon

 

Thanks guys, I assume you're referring to the RV275s. Were EGTs higher? What power numbers could one expect from a timing box with injectors?

Mike

 

egts were less on mine and I made 357 at the wheels with edge juice and the injectors.

 

I'm really want to jump at a set of RV275 Injectors just to gain the extra few MPG points... I'm not to worried about HP/TQ numbers really...

 

well maybe you will be in the market when I take mine out.

 

A few things about injectors.

RV275. There are more than one type in the market. Genuine Bosch, Cheap Chinese imports and optimized injectors.

The differences are that the "real" RV275 does not have the "correct" spray pattern for our pistons. This is the reason the optimized set starting popping up. Thy correct spray angles, run a touch cooler and provide the same power. I would avoid the Chinese sets altogether.

Now, who has what? I have found from doing some secret shopping that many of the diesel aftermarket does not advertise their RV275's as what they truly are. So, buy from a trusted source.

With aftermarket injectors. Many of the honed injectors start life as a real RV275. Since you are honing the wrong pattern to begin with, it gets no better after honing. And other aftermarket injectors are built to a specific spray pattern. It's still up to the end user to figure out what is best for that application.

Regarding making the power and not having EGT issues. I can tell you that virtually any injector 150HP and smaller will work. It's all in how you apply your right foot. Having run 200HP injectors and towing over 18K in the mountains of the PNW, I can tell you it can be done. But you will be driving by the gauges. The bottom line is that more air will have to be added at some point to keep the temps down. And it's not just adding pressure, it's about air density.

So decide what your long term goals are for the truck and modify the SYSTEM, not just throw a bigger stick in there and expect it work like stock. For the most part, you'll be disappointed. While the small aftermarket injectors and RV275's are a pretty safe bet, be prepared for the "what ifs".

Dave

 

That's good info, thank you Dave.

My long term plans are simply to have this truck be my tow rig and DD.. no huge power. I'd like to stay with the HX35 as long as it will handle my needs.

If I were a betting man I would say that another 60hp and 110 lbs of tq would be just enough to make me smile while towing; again, I'm not looking for a fire breather, just something that will pull our 5th wheel nicely with adequate power.

There was a post on one of the other forums where a guy had pretty much the same equipment as me and added Don M's 1.6s and got very favorable results. He said the truck felt "lighter" and drove pretty effortlessly so I was hoping to acheive the same thing only with Mach 1s to be more on the safe side.

Besides, I assume with 300-325 RWHP I "should" be able to tow 12.5k adequately .

Mike

 

I would skip the RV275's then.

Any of the small aftermarket injectors you are talking about will work. Or, you can go to non wire tap box and also get the 60-65HP.

Since you have an automatic, any additional power can lead to an early trans death. Just something to be aware of.

You'll get better mileage out of a box VS injectors in your engine as well. The typical timing added box will usually yield cooler EGTs over a comparable injector. And some boxes can be turned down or off if needed. The injectors are usually a bit easier on the trans however. This is due to needing more throttle input to go the same speed (make same HP) as the box. This is turn raises line pressure, especially at slow speeds and this is what will help the trans survive.

Any way you go, a heavy foot when you are out of lockup and in 3rd lockup is usually the best practice for trans longevity. I sounds contradictory, but it's true. This is why most guys turn their boxes down or use a less aggressive tune. Better EGT control and the side benefit of higher line pressures since your foot is matted most of the time.


Dave