SGII Not quite right

[dremd]

Monroe: See Post #1 I still like it, I'd still buy it, I still recommend it, but I wish it were at least close.


Does anybody know what Load is calculated by?

As far as I can tell the 3 primary inputs the SGII is Load, RPM, MAP.

That said the Bug seams to always have much higher indicated Load, due to vehicle differences, or . .. . .

[cfg83]

dremd -

Originally Posted by dremd

Monroe: See Post #1 I still like it, I'd still buy it, I still recommend it, but I wish it were at least close.


Does anybody know what Load is calculated by?

As far as I can tell the 3 primary inputs the SGII is Load, RPM, MAP.

That said the Bug seams to always have much higher indicated Load, due to vehicle differences, or . .. . .

I think that LOD is a PID that is derived from the ECU/PCM in your car. The SG works with what it is given :

Project obdii Summary
http://prj.perquin.com/obdii/

Tester Commands
request and response packet diagram format: 
cmd0 cmd1 ... -> result0 result1 ...   comment
Note: only the data of the request and only the result of the response are show.
yy 00 -> xx xx xx xx   bitmask of capabilities for mode yy, bit7 represents pid 1, bit6 pid 2, etc, if 
data4:bit0 is set then pid 20 contains capabilities for pid 21-40
00-0F: SAE J1979 Diagnostic Test Modes
01 00 -> xx xx xx xx capabilites 
01 01 -> [b7: MIL light, b0-6: dtc count] [b4-7: readiness] [b5: o2monitoring] [b0-7: readiness]
01 03 -> xx xx  Fuel System Status		bitmap 	b0:Open, b1:Closed, b2:Open-Driving, b3:Open-Fault, b4:Closed-Fault
01 04 -> xx     Calculated Load Value		%	x*100.0/255

EDIT: I got the above from dcb :

ElmScan + Customized Scantool Software = data logging!
http://forum.ecomodder.com/showpost....65&postcount=2

CarloSW2

[dremd]

Originally Posted by cfg83

dremd -



I think that LOD is a PID that is derived from the ECU/PCM in your car. The SG works with what it is given :


CarloSW2

Agreed, it is a reported value from ECM; but from what data/ how . . . .
Any Ideas?

[dremd]

Well My SGII instant mpg now appears to be reasonable.

What did I change you say?

Injector Nozzles, 2 of them were in fact fairly sticky (definite "pop" when sliding pin by hand.

I also had the injectors Balanced.

Will it calibrate close?

Who wants to guess?

But my highway mpg, and city mpg are in the "reasonable" range now so I'm bound to be closer than before.

[tasdrouille]

Did you went with stock size? I got a set of .216 waiting, which I will probably sell. I bought those b4 I started being FE minded. I'm a little over 200k on stock nozzles, maybe I should have a look at them.

[dremd]

Running Power Plus 520's http://www.kermatdi.com/servlet/-str...LUS-520/Detail
on advice from TDI club. Apparently they have the best spray pattern. It has also been theorized that larger nozzles inject more fuel closer to the optimal timing point, and therefore have better economy. Regardless the car is quitter at speed, pulls smoother, and lets face it Torque is fun from time to time.

Most see some fe gain from the pp520's some see no change, some see losses.

[tasdrouille]

An other report of TDI related SGII inaccuracy. ANYONE getting accurate ScanGauge readings on their VWs? - CleanMPG Forums

If the MPGuino can work on the TDI and prove accurate, I'm pretty sure there will be good money to be made over at tdiclub.com for finished units or even just kits.

[dremd]

Originally Posted by marthyj

I don't want to rely on the variation in the bladder to cooperate with SG's calculation. Do I really need to calibrate the readings (i.e fuel consumption, tank size, distance, etc) of the SG?

YES Setup is required . . ..

What bladder are you talking about?

However after making this thread, I had a thought, what if I mis-informed the SGII of engine displacement? It could alter the equation in such a way that it would be correct . . . . .