Calling tuners with big boost....
#19
I think that this might be part of the reason that my truck only ran a 13.0 @ 102 last weekend. I had an excellent launch 1.7 60' pulled like a **** to the 1/8 mile then just kind of lolly gaged around to the 1/4. I ran a 12.8@ 107 with the following mods
6# lower
chip
airkit
slicks
the 13.0@102 was done with the following add ons
custom exhaust -cats
2400 stall
traction bars
ported plenum
new chip/burn
2# upper
Granted my a/f was way rich.. 10.5 and lower through the mid to high rpm's when I was on the dyno. It only put down 370hp and 485tq
last time I was dynoing it was at 397/497
6# lower
chip
airkit
slicks
the 13.0@102 was done with the following add ons
custom exhaust -cats
2400 stall
traction bars
ported plenum
new chip/burn
2# upper
Granted my a/f was way rich.. 10.5 and lower through the mid to high rpm's when I was on the dyno. It only put down 370hp and 485tq
last time I was dynoing it was at 397/497
#21
I have a 6lb lower, oval TB, ported plenum, and intake and I can hit 4.9V every time. I would think this is dangerously close to running out of headroom with the MAF. My 6lb is about the same as a 3lb on a lightning so if you have a 6lb, I'd love to know what you are hitting on your MAF voltage.
Sal told me that he can adjust the "default mode" settings in the event that the maf is pegging, so I think it is curable to some degree on a stock MAF, but not pegging it in the first place would be a nice option...
Sal told me that he can adjust the "default mode" settings in the event that the maf is pegging, so I think it is curable to some degree on a stock MAF, but not pegging it in the first place would be a nice option...
#22
#25
Here's a different way to aprroach it that may work.
As I understand it, the MAF voltage comes from the number of volts needed to heat the filament (wire) in the MAF.
Couldn't you use a more conductive or smaller gauge wire that requires less voltage to heat? That way you would have a lower voltage reading for the amount of heat required, ie, lower voltage reading at lower RPMs, which would allow more headroom for the MAF readings?
Please correct me if any of this seem's wrong.
You would have to recalibrate the MAF settings with the chip, but that shouldn't be too difficult?
Also, talk to Mark @ BOP, and ask him if the PCM can be reprogrammed to allow readings higher than 5 volts.
As I understand it, the MAF voltage comes from the number of volts needed to heat the filament (wire) in the MAF.
Couldn't you use a more conductive or smaller gauge wire that requires less voltage to heat? That way you would have a lower voltage reading for the amount of heat required, ie, lower voltage reading at lower RPMs, which would allow more headroom for the MAF readings?
Please correct me if any of this seem's wrong.
You would have to recalibrate the MAF settings with the chip, but that shouldn't be too difficult?
Also, talk to Mark @ BOP, and ask him if the PCM can be reprogrammed to allow readings higher than 5 volts.
#26
Seems like the proportional band across the range would work as long as the A/f ratio was compensated in the x y axis. With a chip reprogram of the reference look up tables to compensate for the upper range why couldn't the voltage reference work from 1.0 to 4.5 volts ? Numerous TPS sensors I have used on Merkurs worked well below 1 volt. If the range is 1.0 to 4.5 then the PB should work.....Or install a resistor or variable capacitor to fudge the current as needed.
Ok..tell me if I'm phucked up....
Ok..tell me if I'm phucked up....
#27
#28
#29
Uh.....let's see.....
Lie to the PCM......
In a control loop you have variables....
Setpoint
Reset
Proportional Band
Reset Delay so it does not jack off....or oscillate wildly..a stabilizing factor..incremental adjustments..
Fine tuning is a matter of Control.
Control will be the output voltage in this case...
Reference Voltage will be the sensor actuator , the TPS in this case.
An infinite loop with tweaks to maintain preferred Setpoint with applicable reference signals taken into accout.
The Brain..PCM....trys to feed proper Voltage +- :>5 volts DC.
The sensor supplies the reference voltage for any given position or temperature.. MAF sensor is a potentiometer of sorts....a bi metallic strip of sorts that allows current to flow from the referrence suppy..being 5 volts or less in this case.
Just my opinion...I could be wrong.
Lie to the PCM......
In a control loop you have variables....
Setpoint
Reset
Proportional Band
Reset Delay so it does not jack off....or oscillate wildly..a stabilizing factor..incremental adjustments..
Fine tuning is a matter of Control.
Control will be the output voltage in this case...
Reference Voltage will be the sensor actuator , the TPS in this case.
An infinite loop with tweaks to maintain preferred Setpoint with applicable reference signals taken into accout.
The Brain..PCM....trys to feed proper Voltage +- :>5 volts DC.
The sensor supplies the reference voltage for any given position or temperature.. MAF sensor is a potentiometer of sorts....a bi metallic strip of sorts that allows current to flow from the referrence suppy..being 5 volts or less in this case.
Just my opinion...I could be wrong.
Last edited by Twisted99; 05-08-2003 at 10:02 PM.
#30