Treker

Could you explain the differnce between the no added timing and added timing?

Thanks

soulezoo

Well there are others that can explain it better than I can, but essentially the factory timing means the injection event comes on late in the piston stroke to help with emissions and engine quietness. Adding timing results in that injection event occurring earlier on the compression stroke which results in a more efficient burn, lower egts and better MPG and a little power too. Too much timing, which can occur when stacking two (like a programmer with a module) power adders that both add timing, can result in a grenaded engine. So, Smarty offers two tunes, even numbered sw's without timing and odd numbered sw's with timing. Smarty JR was not necessarily designed with stacking in mind, even though it can be, that is why it has timing on all 3 files.

38short

This might be getting off the subject , but I need to know if the Smarty Jr. with added timing results in injector rattle . IVe been running a pressure box and have injector rattle , willl the Smarty Jr. exhibit this ?? any info appreiated.

justutt67

I just installed my JR yesterday and did notice a little timing rattle, but it is not a significant amount IMO. At least not enough to shy me away from using it.

larryt

I have only run #1 (economy) so far and have not noticed any injector rattle from
idle up thru 65 mph cruising, or while shifting thru the gears.

Not a complete test but all I've noticed so far.
Larry

64camo

Mine is noisier than stock. Running the performance setting.

38short

I'd like to hear from the man himself concerning "injector rattle" with the installation or the Smarty JR. Is the added timing responsible for this annoying sound. I have the [pressure box on it right now and the rattle is something I"d like to get rid of. Will the Smarty Sr. have injector rattle also??

Marco

Since the Jr is thought for stock trucks it adds timing in all softwares.
That's the reason for the noisier engine.

Now let's define the difference between " injector rattle " and "engine rattle".

Injector rattle is a by product of raised rail pressure. Except for the beta 42, 43, & 44 softwares Smarty does NOT add any rail pressure thus the injector rattle is not caused by Smarty / Smarty Jr.

Engine rattle,well that's another story.
Let me start with saying, what's often called "engine rattle",

I call DIESEL.

It's the combustion noise of a correctly timed injection event. Correctly timed for DIESEL engine fuel efficency, not gasser type quiet engine.
Soulzoo has been pretty good explaining the injection timing. Yet the "little power" gained with a correct timing in the case of the CR = 40 Hp. Yup, that's 40 Hp gained with just the timing! Most of all, these 40 ponnies are FREE. No more fuel used than stock! The engine is more fuel efficient...

Furthermore, depending upon where we look at in the dyno graph the HP gain due to the advanced timing can be up to 70Hp. The 40 ponnies gained I mentioned above are the peak hp, while the 70 hp gain is in the higher Rpm range.

Engine rattle? Repeat after me, it's a DIESEL...

Marco

JCLeary

Yeah, you want to hear injector rattle, run the old-style EZ box on level 6 or the old-style Ramifier cranked up to 100%.

It's a lot different than the timing rattle from advancing timing on a TST, or the timing rattle from a Smarty.

I just wish there was a way to make our trucks sound like a 24V 2nd gen! Now, that's rattle!

(Plus they sound so much better straight-piped)

Treker

Thank you Marco & Soulezoo -- very interesting... This is my first diesel truck, have been involved with diesel tractors for years.

I'm curious though, how does a reprogram of the ECM generate 100+HP?

ptgarcia

What? I bought a diesel?

soulezoo

A lot easier to explain than to do, and Marco recently spelled this out elsewhere, on a CTD there are essentially four items to manipulate, as far as the ECM is concerned, to raise power. Timing and duration of the injection event, fuel pressure supplied to the injector, and boost levels. (Boost tends to be more a function of mechanics and dynamic exhaust flow but wastegate control, total boost and other ECM funtions have an effect). Because of inherent qualities of Diesel (vs gasser) being throttled by fuel as opposed to air (like gasser), those manipulations of the ECM can give substantially more performance than similar mods done to a gas engine.

Raspy

Well said Marco and JCLeary,

A properly running diesel has combustion noise. I don't want to sacrifice efficiency for quiet.

As soon as I got my truck I started looking for a practical way to advance the timing and how far. I'm very happy with my Smarty and the truck is to with it's rattle.

Celebrate diesels for what they are, torquey, efficient and noisy. If someone wants quiet they should get a gasser.


John

Marco

Yes, that sounds correct to the old diesel nut.

BUT, immagine the new guy on the block. He's always had a gasser... First thing to do with a gasser that all of a sudden develops such an "engine rattle" is to shut of the rattle rattle engine ASAP and start looking what's wrong with it!
I'd do it with a gasser.

I guess, once upon a time, we all were new to the diesel.

soulezoo

I've been around diesels all my life (40+ years; dad was a truck driver and diesel mechanic) and am still new to them...