Smarty Jr. Torque Curves?

[Steev]

Curious to know: does anyone out there have any dyno information on basically a stock truck running the Smarty Jr. in all three of it's settings?



I'm running level 1 at the moment and I know my peak torque is no longer at 1,600 rpm...



Thinking about fuel economy here - I see higher engine loads with my Scangauge when it's under 2000 rpm in certain gears.



Thanks!!

Steev

 

[Motorhead]

Be ready to buy a clutch if yours is still stock! I am going through that now and I only have 21,000mi.
I am wondering what the torque is also as I also run a Smarty jr. I am tossed up as to buy a Southbend ConOFE single disc 3400Lb pressure plate or their 3250 DD set-up.

 

[CToney]

Got Torque? With the JR you will have it. With the HE 351 I now have cool torque. On the '03's our peak was supposed to be 1400. I downshift at 1700 rpm under full load full throttle to save the powertrain. Too much torque is hard on stuff. HP doesn't kill parts. These trucks have a nice flat torque curve enjoy.

 

[Steev]

Thanks guys - I saw text dyno results on the smarty with a factory truck & cold air:
- level 1 - 365 hp / 698 tq
- level 2 - 398 hp / forgot tq
- level 3 - 412 hp / forgot tq

But at what rpm that torque happens I don't know, I'm convinced peak tq has been moved to the above 2000 rpm range, up from 1,600 where it was before on the 325/610 motor. That's what I'm looking for.....

 

[cerberusiam]

Thanks guys - I saw text dyno results on the smarty with a factory truck & cold air:

- level 1 - 365 hp / 698 tq

- level 2 - 398 hp / forgot tq

- level 3 - 412 hp / forgot tq



But at what rpm that torque happens I don't know, I'm convinced peak tq has been moved to the above 2000 rpm range, up from 1,600 where it was before on the 325/610 motor. That's what I'm looking for.....

Peak TQ on a CR is around 2500 rpm's. The Smarty doesn't move it just increases the peak at that point.



Unless the TM is removed the CR engines defuel pretty hard under 1800 rpm's. Smarty Jr removes some of the TM so the TQ will ramp faster but the

peak will still be around 2500.

 

[AH64ID]

This is my dyno sheet. . While the dyno sheet shows a higher tq curve it really isn't I attached the stock dyno below, it's because the truck doesn't get loaded at low enough rpms to make the full power by 1600rpms.


This one would be TM2 TQ2
#ad


This one would be TM4 TQ2 w/ stock thrown in.
#ad


SW1 is timing only and shouldn't affect anything in a negative to the power, it will add to it as you can see in the dyno charts.

As far as the LOD on the SG its a usefull too, but not accurate at low load levels. . And it's an instant load, not overall load. . (so lower rpms, low boost will show a higher load easier than high rpms, high boost). . You can be at 1200 rpms at 30% load, downshift to 1800 rpms and 10% load but be burning more fuel...

Based on the advanced timing on SW1 you should be burning less fuel per hp made than stock. But at low loads you may not notice it as much as high loads (5% of 3GPH or 5% of 6GPH)

 

[Steev]

Incredible response - thanks guys!

I always felt the Scangauge's mileage follows the LOD too precisely - and it never occurred to me that the LOD wouldn't be accurate at the lower RPMs. Makes perfect sense as the boost hasn't had time to build yet.

Goes to show ya a digital gauge is no where near a substitute for a real set of gauges