FPR vs defuel

[TheBac]

Does the FPR contribute to the defuel on shifts??

I installed an LBZ reg and revised the B1010 table to better match the stock LBZ table, and lately Ive noticed shifts under normal driving have a "dead spot" where power drops way off, then comes back.

At the track, I have huge defueled shifts, too. I am thinking it is TBIQ and TLIQ contributing to it, but if the FPR is cutting fuel, would that also affect shift quality?


Also, if I have the values in B1010 too high for the higher mm3s, would that also contribute to lower rail pressure than Ive seen in the past?

 

[TrentNell]

not it doesn't affect the shifting defuel , but is used if a pressure drop is happening on the shift , but commanded fuel pressure would be the culprit to fix and not the regulator tuning .

 

[TheBac]

Oh ho...I see. Thanks Trent.

*looking on efi* "wheres that commanded fuel pressure table at"....


If I posted a screenshot of my log of my last run, you'd laugh at the huge defuel on 3-4 and 4-5. IN fact, shifts get worse as I go thru the gears.

Im going to try my old 12.40 tune this time, and I just dropped main pulse down to 2800 and adjusted FPR to idle smooth. Left everything else alone.

 

[TrentNell]

Oh ho...I see. Thanks Trent.

*looking on efi* "wheres that commanded fuel pressure table at"....


If I posted a screenshot of my log of my last run, you'd laugh at the huge defuel on 3-4 and 4-5. IN fact, shifts get worse as I go thru the gears.

Im going to try my old 12.40 tune this time, and I just dropped main pulse down to 2800 and adjusted FPR to idle smooth. Left everything else alone.

Base pressure , and if its defuling to heavy there are severl things too look at / modify , give me a call Tom and i will go over some stuff with you .