I have noticed that I have been getting black soot on my tail pipe after I have installed my 1715 tuner and a K&N intake. Any idea on why or if I should worry about it.

Thanks

 

This is due inter alia to the fact that the air/fuel mixture in the combustion chamber is what is referred to as layered or, more usually, stratified. A further reason for soot formation in the exhaust gases is that, under certain operating conditions, the fuel injected directly into the cylinder strikes the piston and the surrounding cylinder walls. In GDI engines, it is desirable under certain operating conditions to work with a stratified air/fuel mixture because a lower fuel consumption can then be obtained. In order to ignite a lean air fuel/mixture in the combustion chamber using a spark plug, a locally richer mixture must be produced around the region where the spark plug is located. This state with the mixture being divided into a lean and a rich mixture in the combustion chamber is consequently referred to as stratified. The opposite of a stratified air/fuel mixture is a homogeneous air/fuel misture

http://www.wipo.int/cgi-pct/guest/ge...EMENT_SET=DECL

 

Yes sir, more simply put, the engine is running to rich and would get poor fuel milage.
If you have emisssions testing, the engine will fail.
Sounds like somthing amiss with the chip program or some other thing has happened.
Remove the program back to stock and see what happens..

 

Hi y'all;

Y'know, I thought I remembered reading about this before... yup here it is:

https://www.f150online.com/forums/sh...+soot+tailpipe

Soooo... could actually be normal - I have it too, and I'm custom tuned and it's very unlikely I'm running too rich

Cheers
Grog

 

Actually, the reality is that this is perfectly normal in today's vehicles, they do it in stock trim, too.

There is absolutely *nothing* in the 1715's tuning that is going to cause the vehicle to run "richer" than it does in bone-stock trim under any conditions - absolutely nothing. The MAF transfer function is not changed, cold start fueling is not changed, the A/F's are not made richer than stock in the open loop fuel table, the controls for precisely when the injectors start their shot of fuel, and the timer for when it has to be completed in it's shot of fuel, as well as other adjustments to the fuel tables for "lost" fuel & other things that affect the actual amount of fuel available to be combusted are not affected in any manner that causes a richer A/F ratio - as anyone with any actual experience testing in a properly controlled manner the actual before & after A/F's or the emissions output would know.

Additionally, the 1715 is in fact CARB-approved as well. So no, the 1715 is NOT causing the engine to run richer or to pollute more, etc., CARB would *never* have approved it if that were the case.

So no, the 1715 by itself is not going to cause richer A/F's or additional pollution - in fact, there have been plenty of posts made right here for years of actually getting *cleaner* emissions test results when running that tuning in the 1996-2003 F-150's as compared to the emissions when running on the stock factory tune.

 

thanks for the reply mike, I wasn't sure if it was something to worry about.