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Microtech Help!sputter,backfiring at low rpms on turbo bridged motor (3k to 4k)

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Microtech Help!sputter,backfiring at low rpms on turbo bridged motor (3k to 4k)

Old 10-04-10, 05:53 PM
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87 SE WITH S5 T2 SWAP
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PA Help!sputter,backfiring at low rpms on turbo bridged motor (3k to 4k)

I have a 13B turbo HBP running stock coils,LT8S,76MM turbonetics turbo(divided 1.00 AR Qtrim)
walbro pump,aeromotive regulator,parallel fuel system,680/1600 injector combo and all the supporting mods.Engine has 200 miles on it and it start right up but i have a sputter,hesitation,backfiring issue at around 3K to 4K and is most noticeable when i am free revving the motor,it backfires and loose power at that rpm range until i get of the gas or go easy on the throtle.Under heavy load it feels like i hit a wall but after i hit 4200rpms it takes off hard but my gauge and microtech only registers a max of 2 psi of boost.I checked for leaks on my intake system and found nothing,wastegate is a 50mm hks unit and it was working on a another setup.Could this be a fuel issue?maybe timing?secondary injector not coming online?low compression on the motor?Please help me out guys!Sadly i cant post a log cause my laptop took a dump today but here is the map that is loaded on the microtech,Ask me if you guys need any other info.


Idle Map
Screen 1

30" ~ 1.38
25" ~ 1.48
20" ~ 1.33
15" ~ 1.71
10" ~ 1.71
05" ~ 1.62
00" ~ 2.00
2-20psi ~ 4.95

Load Map
Screen 3

30" ~ 0.95
25" ~ 1.19
20" ~ 1.33
15" ~ 1.71
10" ~ 2.14
05" ~ 2.57
00" ~ 2.86
2psi ~ 2.2
4psi ~ 3.2
6psi ~ 3.8
8psi ~ 4.4
10psi ~ 4.9
14psi ~ 5.5
16psi ~ 5.9
18psi ~ 6.5
20psi ~ 7

RPMwot Map Screen 17

5000 ~ 05
5500 ~ 08
6000 ~ 08
6500 ~ 10
7000 ~ 11
7500 ~ 11
8000 ~ 11
9000 ~ 12

The rest are zero

RPMcrs Screen 18

1000 ~ -12
1500 ~ -11
2000 ~ -12

THe rest are zero



Pump Map
Screen 19

Pump2Start ~ 2000
Pump1Amt ~ 00
Pump1Pulse ~ 04
Pump1Trig ~ 18
Pump1Stop ~ 00
Pump1Adv ~ 05

Pump2Time ~ 10
Pump2Amt ~ 30
Pump2Trig ~ 16
Pump2Stop ~ 00
Pump2Adv ~ 05

PumpDwell ~ 3.00
PumpTimers ~ No
Pump1Sync ~ No
PumpSpare ~ 00
PumpCold ~ 00

Water Map
Screen 20

-25 ~ 0
-17 ~ 70
-9 ~ 60
-01 ~ 50
05 ~ 45
11 ~ 45
18 ~ 42
24 ~ 34
31 ~ 26
38 ~ 24
46 ~ 19
60 ~ 12
68 ~ 06
82 ~ 0
99 ~ 0
124 ~ 0

Air_t Map
Screen 21

-25 ~ 0
-17 ~ 8
-9 ~ 6
-1 ~ 5
5 ~ 4
11 ~ 3
18 ~ 3
24 ~ 0
31 ~ 0
38 ~ 0
46 ~ 0
60 ~ 0
68 ~ 0
82 ~ 0
99 ~ 0
124 ~ 0

Crank Map
Screen 22

-25 ~ 72
-17 ~ 72
-9 ~ 72
-1 ~ 67
5 ~ 62
11 ~ 57
18 ~ 50
24 ~ 41
31 ~ 31
38 ~ 26
46 ~ 20
60 ~ 15
68 ~ 5
82 ~ 0
99 ~ 0
124 ~ 0

t*rpm
Screen 23

Idle ~ 00
1000 ~ 10
1500 ~ 15
2000 ~ 20
2500 ~ 25
3000 ~ 25
3500 ~ 25
4000 ~ 25
4500 ~ 25
5000 ~ 25
5500 ~ 25
6000 ~ 25
6500 ~ 25
7000 ~ 25
7500 ~ ??
8000 ~ 25
9000 ~ 25

t*map Map
Screen 24

Idle ~ 00
25 ~ 05
20 ~ 04
15 ~ 03
10 ~ 02
05 ~ 00
00 ~ 00
2psi ~ 00
4psi ~ 00
6psi ~ 02
8psi ~ -04
10psi ~ -06
14psi ~ -10
16psi ~ -12
18 psi ~ -16
20 psi ~ -20

t*air Screen 25
Correction value Is expressed as number of degrees you wish to advance or Retard to the Ignition curve and values Is set at zero.

t*gap
Screen 26

0500 ~ 15
1000 ~ 15
1500 ~ 15
2000 ~ 14
2500 ~ 12
3000 ~ 10
3500 ~ 10
4000 ~ 10
4500 ~ 10
5000 ~ 10
5500 ~ 10
6000 ~ 10
6500 ~ 10
7000 ~ 10
8000 ~ 10

t*Inj Map
Screen 27

0500 ~ 120
1000 ~ 150
1500 ~ 150
2000 ~ 150
2500 ~ 150
3000 ~ 150
3500 ~ 150
4000 ~ 150
4500 ~ 180
5000 ~ 210
5500 ~ 210
6000 ~ 240
6500 ~ 240
7000 ~ 270
8000 ~ 270
9000 ~ 270

t*wat Map Screen 28


ANd the rest are zero

Option Map
Screen 30

Af_StE ~ 10
Dwell ~ 3.25 *set at Time Base - not at Duty Cycle*
REVstg ~ 1320
MAPstg ~ 02"
%stg ~ 50
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Old 10-04-10, 07:07 PM
  #2  
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okay i just discovered that my stock tach is around 750rpms lower than the rpms that are showing on my pc(i ran a long usb connector out 2 my garage to do some changes on my map)so lets say that it backfires from 4k to 5k,Dam i need to fix my laptop!running b9es on all 4 plugs and 91 octane.motor pulls 12 of vacuum at 1600 RPM(big bridgeport on the secondaries and just polished primaries)
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Old 10-05-10, 10:48 AM
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To me it looks like you need a lot more fuel judging by the RPMWOT settings. However, why aren't you in matrix mode? Ditch the carburetor mode and switch to a proper EFI mode.
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Old 10-05-10, 05:02 PM
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Thanks for the replay Aaron!
I have being using this map as a startup point to get the car running,so the RPMWOT settings have to be changed(adding more fuel)
I will switch 2 matrix mode and add more fuel(i have a plx wideband to check my afr)and go from there.
Also the cars floods sometimes during cold startup,if i dont hold the throtle open a little bit during cold startup the car will idle funny misfire and kill the rear rotor(flooding it)this only happens once i a while(lets say 3 or 4 times a month)other than that the car starts right up when hot,maybe i need to adjust my cranking map?leaky rear injector?Any other ideas guys?
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