Engine/Transmission (1998.5 - 2002) 275's are in, are my results what they should be?

[DManey]

I didn't notice much increase in power by the way of seat-o-pants meter, but the biggest thing I noticed was pulling hills with 8 ton behind me thats when I noticed how much the injectors helped...

 

[AFoulk]

yeah, I did notice that today. Even empty, I can feel it pulling a little harder up a long grade.

 

[Houser]

275s and EZ

I run 275s and an EZ on my HO and love the extra power at higher rpms. Its a little to punchy at low RPMs so I set it on the low jumper setting. Also I have noticed the timing advance increases the MPG @ higher speeds only and doesn't at low speeds so I installed a switch in the 2 wire EZ harness and am able to turn the EZ on and off while driving. This reduces the low RPM ping below 60mph. While crusing @ 65 i turn off the cruse, flip on the EZ and when I turn the cruse back on I gain 2 mpg on the overhead reader.



Houser

 

[rluft]

I didn't notice much increase in power by the way of seat-o-pants meter, but the biggest thing I noticed was pulling hills with 8 ton behind me thats when I noticed how much the injectors helped...

I experienced the same thing. The difference was evident when pulling a load, not so much running empty around town.

 

[johncameron]

While crusing @ 65 i turn off the cruse, flip on the EZ and when I turn the cruse back on I gain 2 mpg on the overhead reader. Houser

You are not actually getting 2MPG better because you overhead says so. You EZ is fooling your computer into thinking so. Have you hand calculated this gain to confirm what your overhead is saying?



John

 

[Diesel Dummie]

I noticed a nice little increase in power with my 275's. As far as the pumps the SO has a 8mm barrel in it, where the HO pump has a 7mm, this is why people switch to the SO as it will make a little more power when you get it to heavy modding.

You will still get the CEL when you get the boost elbow, this is why an EZ will be good because it will fool the comp. int think it is seeing under 20PSI. I have the new Adrenaline and it an awesome box.

 

[PRout]

You are not actually getting 2MPG better because you overhead says so. You EZ is fooling your computer into thinking so. Have you hand calculated this gain to confirm what your overhead is saying?

John

Its interesting, with all the mods we have that their Mfg claims MPG gains, Im still at 18. 5 avg (if you add up all the claimed improvements it should be higher). Thats with RV275's even. I think the truck when it was stock didn't do too much different than that. I only say this so that people keep their expectations "realistic". The MPG differences may not be all that noticeable, but drivability definitely changes a lot between different injector/box/turbo combos.

 

[Vaughn MacKenzie]

To take full advantage of upgrading to the SO pump wouldn't you need to swap out the ECM for a SO version as well?

About the EZ, I'm another one who had a HO which did not like the EZ box, way too much rattle.

Vaughn

 

[AFoulk]

I don't know if that would help any or not. I know theres quite a few guys out there though that have done it and have had good results, but they are running much bigger injectors than me and a module. I've got a EZ on the way. Jed sold me his old one super cheap, so even if it rattles like crazy and I don't like it, its not a real huge loss. I just wanna try it out till I have the coin and supporting hardware to get a Adrenaline.

 

[PRout]

My truck is an SO not the HO but I've tried the original VA box, Smarty, EZ and now have been running the TTPM with milder timing. It is by far the quietest (least timing rattle) and smoothest running box on my rig so far. The VA was somewhere in between (second favorite) and was a pretty good box, but this TTPM combined with the RV275's has made this truck what I had hoped for. Its funny because originally they sounded too mild (low bang for the buck) to ever spend the money on for quite a few years. Wish I had started out with them, might have saved a lot of time & money.

Keep in mind I wasn't looking for drag racing performance, just a smooth but snappy running truck that is enjoyable to drive (on road or just putting offroad trails) and will still pull anything without any problem.

If you want racing performance, RV275's won't do it. You need big sticks, turbo mods, then there's the drivetrain and head work to think about. :-laf

Got bucks??

 

[cArNiVaLwOrKeR]

I love the Rattle, the louder the better!!!

 

[AFoulk]

Its not so much the noise I'm worried about, but any damage it might cause to the engine in the long run.



Prout, what does the TTPM stand for?

 

[Ram4Sam]

Its not so much the noise I'm worried about, but any damage it might cause to the engine in the long run.



Prout, what does the TTPM stand for?

Back in the day, Diesel Dynamics had their version of the Edge EZ, called the TruTorq Power Module. Same box as the EZ, just had less total timing advance than the EZ and has a timing only setting(no added fuel)



Sam

 

[PRout]

It stands for "Diesel Dynamics True Torque Power Module" and is a box that was produced by Edge Products that was basically an EZ, but programmed to Diesel Dynamics' specs instead per their lessons learned from extensive dyno testing early on in the performance game.

The main differences are a milder timing advance, a setting for "timing increase only" (no added fueling) and I think the fueling per boost levels are slightly different (possibly milder - but not sure). The milder timing was to ease the additional timing advance caused by going to larger injectors. It lowers peak cylinder pressures a bit under heavy load and definitely makes the motor rattle less than the EZ does (on an SO motor anyways). I believe DD found that the slight decrease in timing offered less cylinder stress under extended heavy pulling, with a very small loss in performance. The milder fueling maps (if true - am just speculating here) produce less smoke at low boost, but I do know for a fact it has a nicer, seamless fueling curve that is mild and kind of like stock off the bottom, but ramps up nicely as the go pedal is depressed further. IMO, and if this is true, it is a nice compromise for those of us that are shooting for higher overall miles on our rigs. Plus I don't care for all that rattle noise anyways, and this box helped in that dept. significantly.

Again that's just one person's opinion and as others say, your results may vary.

 

[AFoulk]

Well, I just got my ez today, will get it installed tomorrow. Can't wait!

 

[PRout]

That aughtta wake 'er up. . Will be interesting to hear the results.

 

[AFoulk]

Well, got her in today, and man does she go now! I installed a boost elbow at the same time and cranked the screw all the way in. Took it out, and she went pretty good, but I still was only seeing 20psi on my boost gauge. Got it back in the shop, took the elbow out, and I could blow right through it with my mouth. Now I don't know which way your actually supposed to adjust them, but I assumed you turn it all the way in to delay the opening of the wastegate. Anyways, I wound up just pluggint he hole in the turbo and took it out again. Now I'm seeing 29-30psi. The sound of the turbo kind of scared me the first time I hit that high I can lug it down in 5th or 6th and I get a descent haze out the tailpipe till the turbo lights, then it clears up. And no clutch slippage yet, so I'm ok there No timing rattle either that I can tell. All in all I'm pretty happy with it, but I know it wont last long, I'll want more power

 

[LowFly]

Some info i learned about the ISB and defueling:



From 98. 5-00 the truck would defuel if boost got over 20 PSI or so.



2001+ the trucks don’t defuel for high boost. I know, because i have had Mach II with a boost elbow for the last 3 years... seeing 31 PSI all the time with no defueling or codes.



Marco (Smarty) was the one that relayed this info on another forum way back when.



Also you could put SO injectors into an HO for a small HP bump…but hardly worth it unless you just had time to kill and a set of stock injectors floating around.

 

[HookMeUp]

You won't notice the timing rattle until your pulling a load. I have the Van Aaken box, I sent it in to VA to have the timing backed off. Now no timing rattle when pulling our TT.

 

[SnoKing]

It stands for "Diesel Dynamics True Torque Power Module" and is a box that was produced by Edge Products that was basically an EZ, but programmed to Diesel Dynamics' specs instead per their lessons learned from extensive dyno testing early on in the performance game.



The main differences are a milder timing advance, a setting for "timing increase only" (no added fueling) and I think the fueling per boost levels are slightly different (possibly milder - but not sure). The milder timing was to ease the additional timing advance caused by going to larger injectors. It lowers peak cylinder pressures a bit under heavy load and definitely makes the motor rattle less than the EZ does (on an SO motor anyways). I believe DD found that the slight decrease in timing offered less cylinder stress under extended heavy pulling, with a very small loss in performance. The milder fueling maps (if true - am just speculating here) produce less smoke at low boost, but I do know for a fact it has a nicer, seamless fueling curve that is mild and kind of like stock off the bottom, but ramps up nicely as the go pedal is depressed further. IMO, and if this is true, it is a nice compromise for those of us that are shooting for higher overall miles on our rigs. Plus I don't care for all that rattle noise anyways, and this box helped in that dept. significantly.



Again that's just one person's opinion and as others say, your results may vary.

I have a reply somewhere from back a few years, where they (Edge guy) said the early Edge products had this extra timing, but the later ones all matched the "Diesel Dynamics True Torque Power Module". SNOKING