crazy fuel pressure & engine speeds

[Mopar1973Man]

23 hours ago, Quadzilla Power said:

What this means is that if you have larger tires and a corrected speedo via programming, you will probably never have the right trans slip ratio or gear, but the MPG calcuations should still be close. 

 

235/85 R16 vs 265/75 R16 which is 1mm taller and 2 Rev/Mile less. But +3 MPH off at 65 MPH ??? Hua? Manual Transmission no slip...

[Quadzilla Power]

Every time you push in the clutch your transmission is "slipping". In a manual case, it would be closer to clutch slipping than trans slipping, but it is still just a calculation. 

 

[beren]

One thing I'm noticing is the speed sometimes jumps around. Like it'll  jump 3 to 10 miles an hour high and then come back down. This is with smooth study acceleration also

Edited April 29, 2018 by beren

[Quadzilla Power]

This is most often caused by malfunctioning speed sensors. Does it jump on your dash gauge as well? or only the iQuad app? 

I am assuming that these jumps in speed aren't real and only what is reported. 

[beren]

On 3/9/2018 at 9:04 AM, Mopar1973Man said:

Nope, the water hammer killed the fuel pressure sensor. You'll need a new fuel pressure sensor and relocate the sensor away from the VP44. This is one reason my fuel pressure sensor is mounted near the ABS module this gives over 6 feet of tube run away from the VP44 and pulses fade with distance. I'm sunning an ISSPro snubber and a needle valve which the needle valve has no purpose other to close the line if a leak occurs. 

 

So what did you do to move it, just get some ends and a length of fuel line? Do you think a small line would help to even out the pulses since it would stretch/absorb more? I just ordered a new sensor, gotta love eBay sales, I got 15% off :-)

[Mopar1973Man]

12 minutes ago, beren said:

 

So what did you do to move it, just get some ends and a length of fuel line? Do you think a small line would help to even out the pulses since it would stretch/absorb more? I just ordered a new sensor, gotta love eBay sales, I got 15% off :-)