Am I the only one who has a quad that makes the whole truck stumble, buck and shake like the VP is emptying when the throttle reaches the % you set max TPS to? I'll still have 10psi of fuel on the mechanical gauge right before the VP and after extensive test driving i worked out that if my throttle applied percentage equals or exceeds the max TPS it acts like the truck is running out of fuel. Lots of smoke ensues and it cuts out and bucks. I see 2.8.4 ADR is still the latest version. Am I the only one?

 

I'm running aggressive settings without min of 32% max of 40, 50, 60, and 65 as a final setting so the truck doesn't fall on its face. Boost scaling is 20psi, 2100ms (it stumbles and does the same out of fuel fit if I use 2200ms), 150% fueling from 6psi on up.

 

200hp f1 injectors 

62/68 .70ar

475/96/1.32

New Industrial Injection SO VP

New head gasket and no boost leaks, makes 60psi max. On the street 42psi is usually the most I see because I can't play in overdrive without speeding.

Airdog 4g 200 with sump and full gas tank.  New filter and water seperator.

 

I have a drive pressure gauge, s475 boost gauge and an overall boost gauge. Drive is 2-3psi less than boost until 60psi has been sustained for a few seconds, then drive climbs to 80psi eventually (on a 100mph pull).

Edited July 5, 20204 yr by rogerash0

22 hours ago, Me78569 said:

@mopar1973man what would be the cause of a lazy map sensor in terms of voltage?  I can't remember if it is a pull down or pull up sensor? 

 

No idea...

 

All I know I've never seen one Quadzilla yet with accurate boost numbers. I love looking at my logs and seeing Quadzilla reporting some crazy super high boost number. Right now I'm pretty sure my wastegate is blowing open easy. I top out at 35 PSI of boost (ISSPro EV2) and sure enough the Quadzilla will report like 45 to 50 PSI. Previously I was getting 47 to 49 and it would report 67 to 69 PSI of boost in the logs. The only time mine is close to right is below 25 PSI.

Edited July 30, 20204 yr by Mopar1973Man

The main thing is below 16 psi. 

 

When boost is below 16psi the quadzilla is reading the canbus message and sniff out the reported boost number from the ecm.  It is NOT reading the sensor directly.

 

In situations below 16 psi where boost on the quad is not matching a mech gauge we know for a fact that the ecm is not getting an accurate read from the sensor or the ecm is not reporting an accurate read on the canbus.

 

This is not a quad issue rather an issue somewhere else in the system. 

 

Boost numbers over 30 psi not being accurate are not really a big issue. 

It is when people don't have gauges and trying to use strictly the Quadzilla for gauges. I al ways highly suggest gauges vs. Rely on digital tuner. Even Edge has this same problem. 

 

I more or less just use Quadzilla boost reading for diagnostic more so. Use boost gauge is more accurate and Quadzilla will at least tell you if the sensor is working. Thats it. Accuracy just isn't there.

However there is an issue if the ecm is not seeing good boost reads.     My truck was perfectly accurate until ~25 psi.  

 

question is would low 5v source to a 5v reference sensor cause a lazy map read?  Maybe a damaged voltage regulator on the 5v bus?

Would it be reasonable to backprobe a 5v circuit with a fluke while the truck is running to see the delta from 5v? I know atleast on computers you never have a perfect 5v on the 5v rail, its always +/- say 0.25v depending on the PSU.

I believe it should be voltages between 4.5 and .5 voltage.  I dont remember if the sensor is a pull down or pull up sensor.  So at 0 psi I would expect to see either .5 or 4.5v, then as boost comes up I would want to see voltage change.  

 

I've never been able ot have hands on a truck that does what yours is doing so I am only guessing, but maybe the 5v bus is off causing that 0 psi  reading to hold on longer?  I dunno.