that noise is probably more pressure related than timing related.

 

Bob, If Marco does chime in. I would love to know his thoughts on if the timing that the Smarty is using, is enough to cause piston damage if the engine is run hard (heavy loads for long periods).

 

If you lost 5 MPG with your quad XZT something is wrong..... That is one of the side effects to a problem as I read in my packet that came with my exhilarator. Quadzilla sells based on low EGT and mileage increases and a fair price. I saw a 2MPG increase on 60, and a 1MPG increase on 30 when towing.
My engine does make more rattle as I crank the **** higher, but 2 stroke oil has helped offset that some (for offroad use only)

 

The XZT must add a decent amount of timing. With it installed in its original form, my egts would drop below 300 very quickly before shutdown. Now that I had the programming changed and the timing removed to run with my Diablo, it takes much longer, even when by itself. Pretty sure the XZT is pressure, timing and boost, all in one little box. Quad rocks...

 

How could it be that much timing if the gain is only 65hp? I thought it was mainly a pressure box with some timing. If it had more timing it would make more than 65hp. And if you lost 5mpg something else is wrong with your truck. Mine is definitely no worse than stock and most times is 1-2mpg better. I hand calculate every tank.

 

So should I worry about my pistons if I am constantly running sw3 with added timing?

 

Marco is not available for comments at this time but posted elesewhere.


#24
Marco
Offline
Join Date: Dec 1999
Location: Italy
Posts: 1,115

Quote:
OK, something is still not making sense to me. According to the first law of thermodynamics, heat (energy) can not be made to disappear. So, where is this heat going? If it is going into the "cooling system",

Bingo!
that's the right question!
Energy can not be destroyed but all we can do is to change it's state. Any internal combustion engine does change the state of energy. A small part of the energy contained in the fuel is trasformed into kinetic energy, the most part is wasted under the form of heat. Thus far...

What does that have to do with the "advanced" injection timing?
Simple, a correctly timed ( injection event, WHEN the fuel is injected ) diesel engine does it's job with a higher efficency. Thus, more % of the energy contained in the fuel is trasformed into kinetic energy instead of heat. Result: better mileage and higher combustion chamber pressure.

Sure enough, a retarded injection event provides less combustion temps, less combustion chamber pressure, less efficency, less NOx.

If we want to re-establish the efficency grade of the engine we'll want to get the correct timing back. On average, the modern diesel engines are retarded by 1.5-2.0 degrees for emissions. Bumb the timing up to where it should be if emissions would not be a concern...voilą.

One thing is setting the timing where it should be for the engine's efficency.
ANOTHER thing is over advancing the timing. That results in power loss and abnorm combustion temps...

Gentleman, I have done my homework extensivley. My toy does not over advance the timing.

Makes sense?

Marco

 

no. the added timing from just the programmer will not be enough to hurt anything. if you are stacking the smarty with a timing box, running hard, pulling, then there may be cause for concern. heck, i run the smarty on 8 and the quad usually on 100 all the time. no worries.

timing also increases cylinder pressure, so you'll probably pop the headgasket before you hurt pistons with timing. you do have a pyro and are watching it right? then as long as you keep the egt's in check, your pistons will be fine.

 

Yes sir I watch my pyro all the time

 

thanks for all the great info guys!
question for quad How much added timing on the std and race boxes?

I live on Oahu

 

Bob /Marco/ Don
How much timing are flux 3s adding to this equation?
Is to total too much, when added to Smartys timing?
thanks ,doug

 

One nice feature with the SMARTY is a downloadable program for aftermarket injectors. Marco reduce the amount of advance timing with the program.

MikeyB

 

The XZT is fuel the XZT+ is fuel and timing or just timing or just fuel depends on which program you download.

 

Flux injectors add no additional timing...the don't have the dump effect that EH's do.

I still run 6 degrees auto timing from my TST on top of Smarty programing w/ timing...

Quiet idle...no timing rattle on boost.

 

Is this why the 3rd gens seem to light off bigger turbos easier than the older trucks by having the heat in the exhaust? If so, then would one want retarded timing at low boost and low rpm and then advance it as the boost and rpm come up? The beauty of the computer controlled trucks is get that dynamic timing programmed in the ECM!