Smarty 30 HP timing vs TST 30 HP timing

[JStieger]

I just got back from my 1900 mile vacation running the Smarty on 30 HP "timing" with the TST turned off the entire time. I wanted to compare driveability and mileage of the Smarty versus the TST on timing only (1 x # settings) since these are setting that I run at 95% of the time with my 90 HP injectors, which is about 400 rwHP based on previous SPS62 / TST dynos. These are my impressions:



Smarty only = Porsche

TST only = 2-stroke Yugo running on rusty rims



I had my repaired Stage 1 CP3 ready to go on, but I ran out of time to install it before the vacation. What I can say is that running the Smarty is like running the modded CP3 with a TST on 1x0 with all the INSTANT low end and smooth linear power delivery. A TST twins program with a stock CP3 is still a laggy, peaky power adder in my opinion.



The only thing that really sucks about the Smarty is running in a parking lot with speed bumps with the very touchy throttle. I was putzing through a parking lot in 1st gear and idled over a speed bump with my foot barely on the throttle while my wife was taking a sip of water and just about gave her whiplash if it wasn't for the seatbelt kicking in. Smoke is somewhat an issue just off-idle, but very much controllable - and I typically drive at 5,000 to 6,700 feet elevation. Lastly, I did get a code P0602, which is something to do with ECM programming.



I can't say exactly how much mileage gain there was because a lot of the TST miles were towing with big laggy singles or towing with the twins. However, the worst mileage during the trip was 17. 55 mpg running on the interstate at 78 mph at 5,000 feet with an 8,000 lb truck. The following is a snapshot out of my fuel mileage log since new. Interesting to note how much big, laggy singles cost you in mileage BTW!



My next test is loading the Smarty 30 HP "no timing" program and then using the TST on timing only (or add more injector duration with it). I did try running the 30 HP timing with the TST on timing and it didn't produce any weird timing rattle. The power delivery was strong and smooth on the low end and then became peaky when the TST kicked in.



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[JDerbedrossian]

Nice write up, which bd twins do you have, and do you have horsepower numbers between the singles and twins.



Jake

 

[JStieger]

I just have the regular/original 3rd gen BD twins - the one with the Super B top turbo and S300 primary.



I'll get some dynos with the twins once I get the modded CP3 put back on, which should be in the next few weeks.



I checked my mileage records again and all my records of BD twins with TST timing only have been towing something.



The best single turbo, 90 HP injector, TST timing only mileage was 18. 73 mpg (with the SPS 62).



The best BD twin, 90 HP injector, Smarty 30 HP w/ timing mileage was 19. 82 mpg.

 

[Diesel Power]

cool good write up

 

[Bob Wagner]

Julius, Thank you for taking the time and effort, its really appreciated

 

[MoparBob]

That's interesting for sure... makes me wonder how much of the mileage gain over stock was the Smarty and how much were the twins... that would make for an interesting test. Take a stock to relatively stock truck and measure the performance with the stock turbo, the stock turbo plus Smarty, then measure the performance with a set of twins and then the twins with Smarty.

Looking at the posted results, the mileage gain appears to be mostly Smarty, but it could be the combination of the mods... it's hard to tell. The only way we would know for sure would be to do the testing...



I'd be happy to donate the truck and time if someone else would supply the Smarty and the set of twins :-laf

 

[JStieger]

I'd be happy to donate the truck and time if someone else would supply the Smarty and the set of twins :-laf

Yeah, me too! But there were no takers so I had to take matters into my own hands :-laf



The current tank I'm on is going to be all in town with Smarty on 30 HP timing w/ TST off. There will be a few pedal-to-floor runs since I re-installed the modded CP3 yesterday.



Last night I think I finally slipped the FE clutch while in 5th gear. Either that or spinning out on the partially chip sealed roads around here. I need to go verify later this evening...

 

[jwhetsell]

I have run the smarty on timing only pulling a 13ft. v nose inclosed trailer. I know this

timing mode should be for a empty truck,but only had 2 dirt bikes going to W. Virginia

from S. Carolina. Up hill at 70 to 75 pyro would reach 1200. Fuel milage was not as good as expecter. Only 14 mpg on stock turbo,exhaust,lift pump,injector,and vp44.

I am getting bettet milage now on#5 smarty. Fuel pressure is low under load. Will upgrade to 4" exhaust and fass 95. Bob I love the SMARTY.

 

[Bob Wagner]

you need the timing to reduce egt's

 

[ASchwartz]

you need the timing to reduce egt's

What if I am running the TST on level 1x1 and the Smarty on level 2 (60hp with out timing)? Is too much timing a bad thing?



Avi

 

[JStieger]

more mileage results: in town hot rodding

Here's some more hand calculated mileage results from strictly hot-rodding, stoplight-to-stoplight, with some WOT interstate romps:



Smarty on 30 HP timing, TST off: 17. 70 mpg

Smarty on 60 HP no timing, TST on timing only: 17. 73 mpg



Considering the driving conditions I unleashed the above mileage is pretty darn impressive!



Smarty on 60 HP no timing with the TST on timing only makes the truck sound like marbles rolling around a 1 lb coffee can from all the timing rattle. Makes me think that:



1) Smarty on no timing programs is still doing something to indirectly manipulate the injection timing since it fuel so aggressively down low AND/OR

2) Aggressive fueling of the Smarty no timing programs combined with bigger injectors that give the same volume of fuel in a shorter period of time in effect equates to advancing the injection timing.



Thoughts?

 

[ASchwartz]

JStieger,



I would say 1). I hear the same thing on 60hp with no timing on the smarty and 1/0 on the TST. I do not have any injectors to muddle the situation. Is this rattle bad?



Avi

 

[JStieger]

JStieger,



Is this rattle bad?



Avi

Do you mean bad for the engine? Or bad sounding?



It's very loud and it's literally like metal marbles rolling around in an empty coffee can or, if there were such as thing, a bunch of people under your hood while driving and then hammering on the block with small ball peen hammers.



If I power through it by matting the peddle, the rattle is loud, but short lived. If I baby it, then the rattling is very audible all the time.



I guess it could be bad for the engine long-term especially if you're running around heavily modified and trying to use all that power all of the time. That would be a lot of cylinder pressure to deal with in addition to the boost (i. e. , additional pressure to head gasket) one would run when heavily modified.