My sensor came in. I put it on sunday. Seat of the pants- no really noticeable difference in empty acceleration power but certainly the engine runs smoother. I have no muffler and it changed the tone at 65 to be quieter and not as much drone sound ( I like the 2003 no muffler sound). Seems to need less throttle climbing hills and that may be the potential increased torque. Seems to have a little less lag coming out of idle. I am waiting for a mileage increase. My turbo does not spool as much coming up hills so I'm betting that the mileage comes from the increased torque less throttle to go the same speed and less throttle to climb hills. I have no EGT so I can't claim anything there. So far I like it, and the price was GREAT! Now, can i still use the Quad box with the sensor?

 

Just for reference we see no reason that you cannot use the sensor with any of our current products. The 2 deg advance is not that much and may add a nice kick to what we are currently doing. I think 18 degrees is about the max and you won't be anywhere near that.

Before everyone hollars I am not saying 18 deg is optimal, but the engine is ok with it. We think 12-14 is most optimal and we are not there on the current products.

The sensor will most likely help fuel mileage best for those that do a lot of low speed/rpm and idling. The sensor advances as idle and that is something that you cannot normally get the truck to do.

Hope that helps and have fun.


Quad

 

Quad,
I will be patiently waiting.....

MikeyB

 

"The sensor will most likely help fuel mileage best for those that do a lot of low speed/rpm and idling. The sensor advances as idle and that is something that you cannot normally get the truck to do."

Very interesting; I wonder if this has anything to do with the MPG gains in my truck vs. some other trucks. With 315s, 6sp, and 3.73s my rpm is fairly low (2050rpm @ 75ish). I have seen gains of 2 to 2.3 mpg in town and on the interstate. My in town mpg has always been just about the same as on the interstate.

Could this be due to my lower than average effective gear raito (based on Quad's qoute)? I don't idle much but my overall rpms are lower due to my tire/gear set-up.

 

Blown32,
Your 315's decrease your city/town mpg, the reason being that your 315's have a greater mass to get moving. However, they lower your highway cruising rpm's giving you the same or slightly better fuel mileage on the highway. Just remember, your truck sits higher with 315's and has more drag as opposed to stock tires. I would love to see a 2 mpg increase. I have the stock 265's on my truck, when this set is "toast" I think I'll be going to 285's or 295's.
Great news on the increase, what are your actual numbers on the highway?
Odie

 

Quad: you aren't saying that 12 degrees would be optimal across the RPM range are you ?

12 degrees of advance at 750 RPM is a lot. I can see that 12 degrees at 2900 isn't.

I think the limit of the advance is going to be set at the low RPM range.

 

Boost is the only thing that matters, rpm makes no difference. If you can make boost at 1000 rpm then 12 degrees is fine.

The other way to look at it is that 12 deg at idle would be bad like you are saying, but it is not really and rpm thing.

 

Wouldn't 12 degrees at 1000 RPM be terribly early ?

I've 2.22 degrees added via the tone wheel and I can tell the idle is a bit louder. With 10 more degrees of advance I think we'd have combustion before the piston hit TDC ?

I could add a few degrees to my tone wheel pretty quick. I'll see how it does at 2.22 degrees first.

"Boost is the only thing that matters, rpm makes no difference. If you can make boost at 1000 rpm then 12 degrees is fine."

What about peak cylinder pressures ? Although if that is the case and noise is an indicator of peak cylinder pressures, then the VP44 24Vs have a lot more peak pressure than the 3rd gens.

Comments ?

 

1,000 rpm would be a lot if there was zero boost pressure. What I am saying is that if there is boost present then you can run more timing. So if you can make boost at 1,000 rpm then 12 degrees would be ok.

Peak cylinder pressures require more than just advanced timing. If you don't add any fuel then the cylinder pressure increase is somewhat minimal. If you add a lot of timing advance and a lot more fuel then the pressure rise quickly.

It is all about balance.

 

Not to seem crazy or anything but I have a question for the members that did the sensor mod or the tone wheel. Did anyone noticed an improvement in A/C performance?

MikeyB

 

I haven't had time to plumb my A/C compressor, so I can't comment.

The engine idles a lot better with 2.22 degrees of advance, if that has anything to do with it.

 

odie2219,

My mileage has always been BETTER in town (so far after the mod they are about the same). Its odd but city driving has always been the same or better than hiway mileage...go figure. Now I do live in Wyoming and traffic is light and few stop lights get in the way. I can't say about the stock tires because they came off as soon as I got her home.
My thought was that this mod looks like it helps more at low rpm that high.

From my last post on actual after mod mileage:

"645 miles
32.856 gal
= 19.63 miles per gallon

By far the best two tanks (last tank 19.58 to/from work) ever by a LONG ways."

The overhead was off by .3 on the low side on both tanks. If that holds true this tank will be a bit higher. All the mileage posted is hand calculated, filled at the same pump and filled to the top of the filler neck.

Hope it continues to do this well!

 

Same with me mikey- I did the sensor mod and the air conditioning got better, how? I have no idea. When it idled for a time the air would not be as cold and as I accelerated it would get better then at higher speed it would be good. Now it is just really good all the time- seemed crazy but I really noticed it!

Now today I put on the XZT from Quad, I got it at his shop in fort Worth. Together with the timing sensor the thing runs like it's on glass- really smooth- I repeat really smooth. I bet the two work perfect together! Acceleration and torque are really strong but even more noticeable it was much smoother. I never stomp the pedal anyway everything I do is for mileage.

Monte

 

03quadduallyho,
Good! Now know I'm not going crazy. I really didn't pay attention to the A/C until last week and still wasn't sure until today. I saw a 20 degree drop in temperature inside the cab with the ambient temp of almost 100 degrees with the A/C set to normal mod after two miles of driving. Before the mod in normal mode it would take forever to cool down. Normally I would have it set to MAX to get this type of performance out of the A/C and would still take longer to cool down. I don't know why.


MikeyB

 

Wow, what a thread this has become! Interesting observation with the AC too. I believe it is from the lower turbo boost not heating up the intercooler as much, which is in front of the AC heat-exchanger radiator thing. So, cooler air is reaching your AC system, which makes it operate more efficiently. It's funny that it didn't take much timing change for people to notice it. I bet there is even a subtle effect at idle since the engine will automatically inject less fuel with the timing advance to maintain the same idle speed.