Initial Throttle Stab Hesitation
 

Having an issue where when aggressively pressing the throttle off idle is causing a huge hesitation, sometimes enough to cause the car to stall. I've pulled a datalog (I know...it's limited) as well as a copy of my tune.

Basic overview
Half bridge motor with 2 - 1000cc primary injectors (moved to intake runners via CX racing intake manifold), 2 - 2200cc secondary (not sure this is of any consequence as the issue is only coming off idle or when going on off throttle quickly near the idle point).

Date Created - Tuesday, May 19, 2020 2:33:52 PM
E.C.U. Description= MicroTech LT-10c

Setup Type= MazAux40

PAGE No.1
Screen No.(xx)
(01) Idle 30"Hg 1.19 (02) Idle 24"Hg 1.19 (03) Idle 18"Hg 1.19 (04) Idle 12"Hg 1.19 (05) Idle 06"Hg 1.24 (06) Idle>00"Hg 1.52 (07) Aux 02psi 1.57 (08) Aux 04psi 1.38 (09) Aux 08psi 0.00 (10) Aux 10psi 0.00 (11) Aux 14psi 0.00 (12) Aux 16psi 0.00 (13) Aux 18psi 0.00 (14) Aux 20psi 0.57 (15) Aux 24psi 1.76 (16) Aux 28psi 2.52

PAGE No.8
Screen No.(xx)
(01) Load minMS 1.00 (02) Load 24"Hg 1.10 (03) Load 18"Hg 1.19 (04) Load 12"Hg 1.43 (05) Load 06"Hg 1.90 (06) Load>00"Hg 2.67 (07) Load 02psi 2.86 (08) Load 04psi 3.14 (09) Load 08psi 3.71 (10) Load 10psi 4.43 (11) Load 14psi 5.19 (12) Load 16psi 5.95 (13) Load 18psi 6.81 (14) Load 20psi 7.76 (15) Load 24psi 8.62 (16) Load 28psi 9.43

PAGE No.17
Screen No.(xx)
(01) RPMwot>0500 +00% (02) RPMwot 1000 +00% (03) RPMwot 1500 +00% (04) RPMwot 2000 +00% (05) RPMwot 2500 +00% (06) RPMwot 3000 +02% (07) RPMwot 3500 +02% (08) RPMwot 4000 +02% (09) RPMwot 4500 +02% (10) RPMwot 5000 +02% (11) RPMwot 5500 +02% (12) RPMwot 6000 +02% (13) RPMwot 6500 +00% (14) RPMwot 7000 +00% (15) RPMwot 8000 +00% (16) RPMwot 9000 +00%

PAGE No.18
Screen No.(xx)
(01) RPMcrs>0500 +00% (02) RPMcrs 1000 -06% (03) RPMcrs 1500 -10% (04) RPMcrs 2000 -11% (05) RPMcrs 2500 -10% (06) RPMcrs 3000 -05% (07) RPMcrs 3500 +03% (08) RPMcrs 4000 +01% (09) RPMcrs 4500 +00% (10) RPMcrs 5000 +00% (11) RPMcrs 5500 +00% (12) RPMcrs 6000 +00% (13) RPMcrs 6500 +00% (14) RPMcrs 7000 +00% (15) RPMcrs 8000 +00% (16) RPMcrs 9000 +00%

PAGE No.19
Screen No.(xx)
(01) Pump1 Amt +10% (02) Pump1pulse +02 (03) Pump1 Trig +10 (04) Pump1 Stop 00"Hg (05) Pump2start 2000 (06) Pump2 AMT +30% (07) Pump2 TIME +10 (08) Pump2 TRIG +16 (09) Pump2 STOP 05"Hg (10) Pump1 ADV +05 (11) Pump2 ADV +05 (12) Pump Dwell 4.00 (13) PumpTimers NO (14) Pump1 Sync NO (15) Pump Spare +08 (16) Pump Cold +00%

PAGE No.20
Screen No.(xx)
(01) Water 124 C +00% (02) Water 99 C +00% (03) Water 82 C +00% (04) Water 68 C +08% (05) Water 60 C +11% (06) Water 46 C +15% (07) Water 38 C +22% (08) Water 31 C +29% (09) Water> 24 C +35% (10) Water 18 C +45% (11) Water 11 C +48% (12) Water 05 C +54% (13) Water -01 C +58% (14) Water -09 C +60% (15) Water -17 C +70% (16) Water -25 C +00%

PAGE No.21
Screen No.(xx)
(01) Air_t 124 C +00% (02) Air_t 99 C +00% (03) Air_t 82 C +00% (04) Air_t 68 C +00% (05) Air_t 60 C +00% (06) Air_t 46 C +00% (07) Air_t 38 C +00% (08) Air_t 31 C +00% (09) Air_t> 24 C +00% (10) Air_t 18 C +00% (11) Air_t 11 C +00% (12) Air_t 05 C +00% (13) Air_t -01 C +00% (14) Air_t -09 C +00% (15) Air_t -17 C +00% (16) Air_t -25 C +00%

PAGE No.22
Screen No.(xx)
(01) Crank 124 C +00% (02) Crank 99 C +00% (03) Crank 82 C +00% (04) Crank 68 C +05% (05) Crank 60 C +15% (06) Crank 46 C +20% (07) Crank 38 C +30% (08) Crank 31 C +38% (09) Crank> 24 C +49% (10) Crank 18 C +60% (11) Crank 11 C +65% (12) Crank 05 C +70% (13) Crank -01 C +75% (14) Crank -09 C +80% (15) Crank -17 C +80% (16) Crank -25 C +85%

PAGE No.23
Screen No.(xx)
(01) t rpm Idle> +20 (02) t rpm 1000 +20 (03) t rpm 1500 +20 (04) t rpm 2000 +20 (05) t rpm 2500 +20 (06) t rpm 3000 +20 (07) t rpm 3500 +20 (08) t rpm 4000 +20 (09) t rpm 4500 +20 (10) t rpm 5000 +20 (11) t rpm 5500 +20 (12) t rpm 6000 +20 (13) t rpm 6500 +20 (14) t rpm 7000 +20 (15) t rpm 8000 +20 (16) t rpm 9000 +20

PAGE No.24
Screen No.(xx)
(01) t map Idle> +09 (02) t map 24"Hg +07 (03) t map 18"Hg +05 (04) t map 12"Hg +03 (05) t map 06"Hg +02 (06) t map>00"Hg +00 (07) t map 02psi -03 (08) t map 04psi -05 (09) t map 08psi -07 (10) t map 10psi -09 (11) t map 14psi -10 (12) t map 16psi -10 (13) t map 18psi -10 (14) t map 20psi -10 (15) t map 24psi -10 (16) t map 28psi -10

PAGE No.25
Screen No.(xx)
(01) t air 124 C +00 (02) t air 99 C +00 (03) t air 82 C +00 (04) t air 68 C +00 (05) t air 60 C +00 (06) t air 46 C +00 (07) t air 38 C +00 (08) t air 31 C +00 (09) t air> 24 C +00 (10) t air 18 C +00 (11) t air 11 C +00 (12) t air 05 C +00 (13) t air -01 C +00 (14) t air -09 C +00 (15) t air -17 C +00 (16) t air -25 C +00

PAGE No.26
Screen No.(xx)
(01) t gap >0500 +10 (02) t gap 1000 +10 (03) t gap 1500 +10 (04) t gap 2000 +10 (05) t gap 2500 +10 (06) t gap 3000 +10 (07) t gap 3500 +10 (08) t gap 4000 +10 (09) t gap 4500 +10 (10) t gap 5000 +10 (11) t gap 5500 +10 (12) t gap 6000 +10 (13) t gap 6500 +10 (14) t gap 7000 +10 (15) t gap 8000 +10 (16) t gap 9000 +10

PAGE No.27
Screen No.(xx)
(01) t inj >0500 090 (02) t inj 1000 120 (03) t inj 1500 120 (04) t inj 2000 120 (05) t inj 2500 120 (06) t inj 3000 150 (07) t inj 3500 150 (08) t inj 4000 150 (09) t inj 4500 180 (10) t inj 5000 180 (11) t inj 5500 210 (12) t inj 6000 240 (13) t inj 6500 270 (14) t inj 7000 270 (15) t inj 8000 270 (16) t inj 9000 270

PAGE No.28
Screen No.(xx)
(01) t wat 124 C +00 (02) t wat 99 C +00 (03) t wat 82 C +00 (04) t wat 68 C +00 (05) t wat 60 C +00 (06) t wat 46 C +00 (07) t wat 38 C +00 (08) t wat 31 C +00 (09) t wat> 24 C +00 (10) t wat 18 C +00 (11) t wat 11 C +00 (12) t wat 05 C +00 (13) t wat -01 C +00 (14) t wat -09 C +00 (15) t wat -17 C +00 (16) t wat -25 C +00

PAGE No.29
Screen No.(xx)
(01) Aux RPM_ON OFF (02) Aux MAP_ON OFF (03) Aux RPMoff OFF (04) Aux TPSpos +00% (05) Aux FAN_ON 90 C (06) Aux AIRmin 10.33 (07) Aux AIRmax 10.76 (08) Aux AIRwat 0.48 (09) Aux AIRafs 0.10 (10) Aux RPMset OFF (11) Aux FANadd 0.05 (12) Aux FANair 0.00 (13) Inp RPMlim 6500 (14) Inp AIRadd 0.29 (15) Inp Enrich 0.00 (16) Inp Timing +00

PAGE No.30
Screen No.(xx)
(01) Opt MIXtrm +00% (02) Opt TPScal +10% (03) Opt TIMtrm +00 (04) Opt Static +00 (05) Opt TIMmax +28 (06) Opt RPMwot 00"Hg (07) Opt rpmCRS 02"Hg (08) Opt Af_StE +10% (09) Opt IGNlim 8500 (10) Opt REVcut OFF (11) Opt BstCUT 20psi (12) Opt REVstg 3180 (13) Opt MAPstg 01"Hg (14) Opt %stage +95% (15) Opt Decel OFF (16) Opt Dwell 3.50

PAGE No.31
Screen No.(xx)
(01) Maps = Normal (02) Config +04 Cyl/R (03) FiringSEQUENTIAL (04) LOAD= MAP sensor (05) DWELL= time base (06) Input Trig +POS (07) Spark Trig IGBT (08) Timing check OFF (09) Rpm_ON 3500 Log (10) Map_ON 02psi Log (11) Trim#1 +00% Log (12) Trim#2 +00% Log (13) SHIFT 7000 Dash (14) WATER 99 C Dash (15) AIR_T OFF Dash (16) BOOST OFF Dash

PAGE No.32
Screen No.(xx)
(01) PROG = ENABLED (02) E.C.U= ENABLED (03) Char1=A ADT22K93 (04) Char2=D ADT22K93 (05) Char3=T ADT22K93 (06) Char4=2 ADT22K93 (07) Char5=2 ADT22K93 (08) Char6=K ADT22K93 (09) Char7=9 ADT22K93 (10) Char8=3 ADT22K93 (11) Pin#1=0 00 00 00 (12) Pin#2=0 00 00 00 (13) Pin#3=0 00 00 00 (14) Pin#4=0 00 00 00 (15) Pin#5=0 00 00 00 (16) Pin#6=0 00 00 00

Datalog
https://cimg3.ibsrv.net/gimg/www.rx7...452f27f9b7.jpg

Does the hesitation only happen with a throttle stab between idle - 2000 RPM? Is so, you can try and up the Pump1 AMT value on page 19

If the hesitation happens between idle and any RPM range, you could try adding more fuel to the 6" - 0" Hg area on Page 8.

Once you've fixed that hesitation, switchover the Pump enrichment settings to TPS for a quicker, less laggy response (Pump1/2 Stop OFF)

Thanks for the advice. The hesitation seemed to occur between idle and any RPM. The data log was from my old idle of about 1800rpms and my current idle is set to around 2200 and it still occurs.

I'll increase the high vacuum range fuel as you suggest and move the pump settings to TPS and report back. Appreciate the feedback.

Moving it to TPS netted the best improvement. I'll continue today with the load cell adjustments to see if I can further improve. Much appreciated!