Right now my truck is stock except for gauges. I plan on adding a 4" exhaust and BHAF. I
currently tow a 6000# TT that sits up pretty high( lots of wind resistance). At 65-70 mph,
where I like to tow I have to give it enough throttle to keep it at this speed. My question is I am looking at the Diesel Dynamics True Torque Module and it says it adds 40hp and 90ft/lbs
of torque. Is this peak ? and is there a greater increase where I need it (1900-2100 rpm). They want $450-$500 for it so I want the most power for the buck.

 

edge products has the ez module 65 rwhp and 185ft/lbs of torque

 

I would go with injectors on an HO truck. RV275 injectors will get you you some nice towing power. You can get a set for around $250.00.

Edit: I spoke with these nice folks. http://www.midwest-diesel.com/

 

One key advantage of the TTPM over the EZ is that the TTPM isn't as aggressive on timing advance as the EZ. With its higher compression, the HO doesn't want to see as much timing advance as the EZ provides, especially when towing heavy.

The TTPM and EZ both plug into the CANbus diagnostic port. This means that neither (unlike a pump wire tap box) can fuel beyond the absolute limits programmed into the ECM/VP-44 firmware. The net result of this is that these boxes increase fueling in the mid-range but tail off toward 2700 RPM and above. The horsepower gain advertised by the EZ is (IIRC) around 2100 RPM, not at the rated 2700 RPM BHP peak.

From a "seat of the pants" perspective, when I was running stock HO injectors, my EZ gave much improved throttle response and BHP/torque from 1600 RPM up to 2400 RPM or so, then I could feel it tailing off as the fueling curve dropped back toward the ECM/VP-44 absolute limits. For towing, this is just what you want.

Another benefit of the TTPM/EZ boxes is that, if you use the supplied boost elbow, boost levels will increase (mine went from 21 PSIG to 30 PSIG with stock injectors) and peak EGTs will decrease (mine dropped from 1300 degF to 1100 degF when towing).

Either will make an excellent towing box, but if I had it to do over again for my HO towing our 16K GVWR 5th wheel (see signature), I would have gone with the TTPM for the reasons cited above.

Since the stock HO is prone to high EGTs when towing (1300 degF, in my case), adding more fuel with larger injectors should (IMHO) be done only if more air (boost) is added as well - this means that in addition to the injectors, you'd need a boost elbow and boost fooler to complete the package. The TTPM and EZ already have a boost fooler built in, so there would be an advantage from that perspective to go with the box first, then add the injectors (as I did with the DD2s) if you want more later.

JM2CW

Rusty

 

Good info Rusty! Didn't know the TTPM had less timing than the EZ. If DieselCamper goes with a box, won't he need to get a turnbuckle as well?

 

Nope. His HO engine uses the HX35W-12 turbo that can take a boost elbow. The HY35W-9 turbo used with the SO automatics requires the turnbuckle (or a strategically placed 22 jacket) since the wastegate is hardlined.

Rusty

 

Thanks for the info. Now if someone would just come up with
a ready to use heatshield for sale for my BHAF I would be set.

 

Check out Larry B (of LarryB's Starter Contacts fame). He sells a small, attractive polished stainless steel heat shield that I use with my BHAF.

Rusty