4000rpm stummble?
4000rpm stummble? Regular driving AF is at 14.5-15 untill 4000rpm then 10.5AF, same problem in WOT AF 12-12.5 until 4000rpm and after that 10.5-11AF 
I am a newbie to tuning but no matter what I try in the PE for WOT same problem. Any suggestions I am 
Here is my setup:
2000 VCM Howell harness & HP Tuners
1993 mazda RX-7
01 LS1 with T56
28.8lbs injectors
LS6 intake, 241 heads stage 1 TEA Milled 0.030, stock valves
Cometic 0.040 Head Gaskets
intake exhaust
.100 71.0 52.6
.200 136.4 109.2
.300 207.2 159.1
.400 249.1 203.8
.500 280.1 230.8
.550 288.5 239.2
.600 291.1 245.2
CAM- Futral F6 226/230 .575/.595 112lsa
Also 1 7/8 LT's, 2.5 true dual exhaust with dynatech cats, 85 SLP Maf deristorized running 01Z06 maf table, Ported TB, Billet flwheel, LS2 timing chain, Ported LS6 oil pump, ARP rod Bolts,ASP pulley
I am a newbie to tuning but no matter what I try in the PE for WOT same problem. Any suggestions I am Here is my setup:
2000 VCM Howell harness & HP Tuners
1993 mazda RX-7
01 LS1 with T56
28.8lbs injectors
LS6 intake, 241 heads stage 1 TEA Milled 0.030, stock valves
Cometic 0.040 Head Gaskets
intake exhaust
.100 71.0 52.6
.200 136.4 109.2
.300 207.2 159.1
.400 249.1 203.8
.500 280.1 230.8
.550 288.5 239.2
.600 291.1 245.2
CAM- Futral F6 226/230 .575/.595 112lsa
Also 1 7/8 LT's, 2.5 true dual exhaust with dynatech cats, 85 SLP Maf deristorized running 01Z06 maf table, Ported TB, Billet flwheel, LS2 timing chain, Ported LS6 oil pump, ARP rod Bolts,ASP pulley
looking at your file there shouldnt be any issues in the tune...
it looks like you have a different MAF table than stock and my guess is that you need to calibrate that table correctly
if youare running SD then your problem is in the VE table...
also I would check your ECT sensor...its possible its not connected fully or its bad and its only seeing a temp of like 14*F or something and that would get you in the same problems with AF being so rich
other than that all I can say is maybe your wideband is going nuts or overheating or losing power when you hit WOT at 4000 rpm...possibly a loose connection or something??
it looks like you have a different MAF table than stock and my guess is that you need to calibrate that table correctly
if youare running SD then your problem is in the VE table...
also I would check your ECT sensor...its possible its not connected fully or its bad and its only seeing a temp of like 14*F or something and that would get you in the same problems with AF being so rich
other than that all I can say is maybe your wideband is going nuts or overheating or losing power when you hit WOT at 4000 rpm...possibly a loose connection or something??
I am not running SD, but I will check those things out. Thanks for the suggestions. By the way I am running a 85mm SLP Maf deristorized running 01 Z06 maf table. Is this OK?
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Verdad Gallardo I think Jimmy Blue has had good success with the 5.3L truck tables...
but personally I prefer to change the dynamic airflow stady state values to let the MAF have more control than stock...then I tune the MAF using AFR wideband error % and then change teh valuse fir steady state back to stock later when its all dialed in..then do a touch up with it set at stock values.....
but personally I prefer to change the dynamic airflow stady state values to let the MAF have more control than stock...then I tune the MAF using AFR wideband error % and then change teh valuse fir steady state back to stock later when its all dialed in..then do a touch up with it set at stock values.....
Originally Posted by robertbartsch
GET RID OF THE SLP MAF AND PUT IN THE FACTORY UNIT.
See if that cures the issues first. My bet it that the SLP MAF is causing all this.
See if that cures the issues first. My bet it that the SLP MAF is causing all this.
thats not the issue...
the issue is that the MAF and the MAF table do not agree with one another...
once he reacalibrates the MAF table then it will be fine
Which one should I try, been doing some researching...
http://home.cfl.rr.com/jimmyblue/MAF...s_20040914.xls
https://ls1tech.com/forums/showthrea...hlight=slp+maf
http://home.cfl.rr.com/jimmyblue/MAF...s_20040914.xls
https://ls1tech.com/forums/showthrea...hlight=slp+maf