[KingLT1]

A friend just finished up his build and went with one of these SMG drop in pumps for the low side.

2016 SS A8

Mods:

Rods/Pistons 377
Ported Heads
Btr stage 2 38% lobe cam
LPE HPFP
+30 FIC injectors
P1x stage 2 w/ 3.9 upper 8" lower. Makes 12 psi on this setup.

on E50 this low side pump will not keep up on its own. Tried the SMG settings and everything in-between still no dice.

Hooked the JMS up since it was previously installed with a LT4 pump and low side pressure holds great.

SOI- 366
EOI- 190
5.3ms injector
2600psi rail
.84 lambda
101lb/min dynamic airflow

The problem is the FSCM doesn't like this SMG/JMS combo. It literally throws a CEL for insufficient fuel even when cruising part throttle and the JMS isn't active. Unplug JMS no codes. Logs show fuel system is fine but pressure won't hold.

Old setup with the LT4 low side pump and JMS no issue.

Tried lowering JMS voltage...same issue.

Not sure what's up but it looks like this pump has to come out since it won't play nice with the JMS...shame because there is plenty of fuel with this combo but no bueno with the codes.

Either way the claims of 900whp using this pump only with no other assist appears to be false...at least targeting .83-.84 on E blend. Might be ok running leaner or race fuel.

Just sharing info.