Engine/Transmission (1998.5 - 2002) EZ and RV275s or Comp

[TWilkening]

I'm wanting to get some more power out of my truck for towing and don't know which way to go. I already have an EZ and can't decide whether to drop in a set of RV275s or ditch the EZ and pick up a Comp. Which would be better for towing? I like the idea with the Comp of having a tow setting, then being able to smoke out a pesky tailgater instantly, but am more concerned about things like EGT control and reliability. Thanks

 

[ed9824v]

I didn't put these truck together thats good and bad at times saved a LOT of money someone doing all the work and just buying it that way. I have and edge EZ with 275 injectors and the turbo is hx35w. and this thing is great on the street and great towing. The trans has been all worked up also. I buff of smoke when you get on it 35" tires and 3. 55 gears and gets about 18mph 4x4. I have only towed with it one and was getting 15mph. It came with a I think is a tst 175hp chip and that is more then I would need. I am going to leave well enough alone. I am pleased. also the 4" pipe with muffler. the egt are not an issue at all even towing. Ed

 

[darkhorse]

Opinions vary but I favor larger injectors over the longer injection event that a wire tap provides.

 

[DCreed]

a mild injector is the way to go! No reliability issues, no VP problems or loose/corroded wires. just reliable power all day every day as your truck was intended to have. your next investment will be a trans/TC then you can add any box you choose!(WITH the injectors!)

 

[Boondocker]

My upgrade path went like this:
EZ (ran on level 2)
EZ + RV275s (ran on level 2)
EZ + F1 Mach 1. 6s (ran on level 2)
Comp + M1. 6s (ran on 1/1 towing, 4/1 street - not enough turbo)
Smarty + M1. 6s (run level 3 towing, can't decide for street, #5 today)

Once I went to Mach 1. 6 injectors, EGTs became a concern with the stock HX35 turbo.

The bottom line here is that the EZ + RV275 injectors give you almost 100 HP increase that is very usable, very towable, and by far the best value. If I did more towing and less commuting, and was less enthralled with performance, I'd still be a happy camper with the EZ+275 combo. Darn that performance bug, now I need a better turbo just to use all the fuel I have.

BTW, unless you've upgraded your trans (can't tell by your sig), I'd leave the Comp or the Smarty alone.

Regards,
Neil

 

[johncameron]

I'd go for a set of injectors before upgrading to a comp. You'll need a transmission and a turbo to run a comp.

 

[CCahill]

John, and boondocker are right on... .



I too stated with an EZ... . for about a month, then went to the trans upgrade, because I could... . then ran DD2's, and a comp box... . and then another trans, and another... . and I always run the truck on 2... . but towing, and all takes a toll on the trans with the power...

 

[TWilkening]

I think it's pretty much agreed that the 275s are the way to go. So I guess my next question is where the best place to buy is. I seen PDR has them on special for just shy of 300.

 

[darkhorse]

I think it's pretty much agreed that the 275s are the way to go. So I guess my next question is where the best place to buy is. I seen PDR has them on special for just shy of 300.

RV 275's are a best buy for the money but there are better injectors out there. You might check the classifieds for used Mach 1. 5's or 1. 6's.

 

[Jed]

My upgrade path went like this:



The bottom line here is that the EZ + RV275 injectors give you almost 100 HP increase





Boondocker,

Are you sure about this? I have been warned about trying to stack hp numbers like that. With my truck and that combo I did not feel 100hp stronger. With all of my listed mods I still dyno below 400hp, close but not quite.





Darkhorse,

In what way are they better? Are they the same hp rating?



jed

 

[bncech]

injectors for sure they seem to really give me a longer power band

 

[Mundgyver]

The mods on my signature have over 170,000 turns on them. My truck has 206,000+ turns on it now. I still have my original VP and original HX-35 Turbo.



With the 275's you have reliability and you gain mileage, about 1 to 1. 5. The Comp gives you the ability to have selectable power on hand when needed for freeway merging. If I load up the Smarty on top of the Comp, I can pretty much break things if I am not carefull.



I generally tow in stock mode just using the 275's with the comp turned off. The reason is the ECM will not allow me to overtemp, unless I turn the Comp on.



Its a balancing act. Oh and I can get 15 mpg at 23,000 lbs CGVW. Empty I can get 23 if I don't drive lead footed.



I have never had any problems with this set up. With everything turned on and running unloaded, my top end is about 131 mph tached out at 32/3300 rpm according to my Garmin GPS.

 

[darkhorse]

Darkhorse,

In what way are they better? Are they the same hp rating?



jed[/QUOTE]



The number , size & spray angle of the holes are different. The Mach 1's are about the same power as the RV 275's The 1. 5's & 6's are closer to 90 hp.

 

[PRout]

I have run the mach 1's and 275's. Went back and forth trying to make the final choice. Settled on the 275's for better overall drivability. The M1's ran a little hotter (due to more power, and were more responsive) but raised the idle higher that I cared for which essentially degraded the effectiveness of the exhaust brake, but do give more power and make it feel more "racey" to where the 275's feel more natural for the truck In My opinion only.

This is why I asked if Don M would produce one of his F1 style injectors that were in a similar power range as the 275's, maybe call them Mach . 75's, but I don't think that idea got very far. I would have tried them, because he does produce fine injectors.

You should have a power box with 275's as stated above for when you want/need more acceleration. With a timing box, and maybe a fueling box, they have made the best injector / box combo in my rig so far, they run pretty cool also on the pyro (next best was DD1's). Again, just one person's opinion.

 

[darkhorse]

I have run the mach 1's and 275's. Went back and forth trying to make the final choice. Settled on the 275's for better overall drivability. The M1's ran a little hotter (due to more power, and were more responsive) but raised the idle higher that I cared for which essentially degraded the effectiveness of the exhaust brake, but do give more power and make it feel more "racey" to where the 275's feel more natural for the truck In My opinion only.



Phil, I'm a little confused. None of the injectors I've run (stock, Mach 1. 5 & 3. 8) have changed my idle in the least. That is controlled by the ECM. I know a larger injector CAN create more heat but one does not need to use it all. I've found egt's easily controlled with my right foot. My milage improved about 1-2 with the 1. 5's & was not changed when I went to the 3. 8's. Again, it's all in the right foot.

 

[DCreed]

sounds like a minor pop-off pressure/timing or atomization issue at idle on the mach 1s compared to the 275s. In this case.

 

[DPrew]

I've got a bunch of mods but if I was in your shoes I would get a Smarty. You can stack the Smarty with your EZ. A Comp later would be even better to replace the EZ. The big benefit of the Comp (besides power) is in cab adjustability. The Comp stacked with the Smarty on level 8 is for fun and a Smarty on 9 is great for towing.

 

[PRout]

It all depends on what you want. IMO smarty on the high levels is WAY overfueled off the bottom, and the throttle range is too compressed. Causes cruddy drivability. I like my truck running smooth and reasonably efficient off the bottom. Much better for daily driving, cruising trails and rock crawling. Just different strokes I guess. .

Smoke off the bottom, is just wasted fuel and attracts the man.

At least the comp is adjustable to have reasonable response off the bottom, with the ability to crank up the power at any point, and it can be done while driving.

Comp vs smarty is a no-brainer on 2nd gen trucks. Comp gives a LOT more power options including the timing advance. No need for stacking boxes in this config.

 

[PRout]

sounds like a minor pop-off pressure/timing or atomization issue at idle on the mach 1s compared to the 275s. In this case.

Yeah, I hadn't seen this with any of the other bigger injectors I ran for the past few years either. For some reason, these 1. 0's (according to one very well-known and respected vendor can raise the idle about the same percentage as they are more efficient which is about 7%. ) His words were quote. . "That doesn't surprise me at all. " Received similar answers from about 3 other well-known performance guru's that frequent this site also, including an engineer at Industrial Injection. He told me this was not an unusual thing, and obviously idle is not adjustable on the VP44. The thing of it was that one of the techs I spoke with (you all know him on here) told me for some reason the 6 speeds seem to be more sensitive to idle speed / APPS idle switch validation. So, in hoping to like the injectors better, I even replaced the APPS (for just a few added bucks to the experience) and no change. (Not blaming the tech, just took a shot and now have an extra apps as a spare)

Ordered new copper washers, put the RV275's back in, and the idle is back down again. Runs very well in all conditions (just sometimes needs a little help via the power box, but that provides plenty of kick in the pants for me).

Like I said before, I'm not downing the Machs. The ones I had ran excellent, and were very well matched. I just like the 275's.

 

[darkhorse]

Smarty improved my throttle responce tremendously over the EZ I used before. I find it very "drivable". It didn't take long to learn to roll into the throttle to control smoke. The Comp taps the wire & the Smarty does not. That makes them different beasts. Smarty is better compared with an EZ .