Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[tigers_gonads]

As in the other thread running on here.
Am I right in thinking that the stag ecu only learns its data parameters while you are calibrating the map ?
Once you have saved the map, it cannot update its block data like the petrol ecu 

One I manage to get the petrol ecu side to behave its self, will I have to re calibrate the gas again to match the new petrol settings ?

[feeutfo]

Depends which stag ecu you have I believe. Stag plus will learn if set to do so.

[tigers_gonads]

Depends which stag ecu you have I believe. Stag plus will learn if set to do so.

Stag 300 plus 
Only had it fitted 9 months so I believe it will be the latest one.

Is it a case of once you have saved the map, thats it, it runs that map regardless of the cars HT ignition condition 

[Lazydocker]

The LPG map will always keep adjusting itself However, if it's mapped properly to start with it shouldn't make too much difference!

If you have sorted a major issue I'd recommend calibrating again. I've found that it also drifts if the driving style varies for a long enough period of time.

[tigers_gonads]

The LPG map will always keep adjusting itself However, if it's mapped properly to start with it shouldn't make too much difference!

If you have sorted a major issue I'd recommend calibrating again. I've found that it also drifts if the driving style varies for a long enough period of time.

Thanks LD 

The lpg map line was consistently just below (within 5mm) the petrol line on the map and from day one, it has rev'd upto the rpm red line with no problems 
The Manifold Air Pressure tends to wander around anywhere between 0.9 and 1.2 bar but it seems to run ok 

[Lazydocker]

The LPG map will always keep adjusting itself However, if it's mapped properly to start with it shouldn't make too much difference!

If you have sorted a major issue I'd recommend calibrating again. I've found that it also drifts if the driving style varies for a long enough period of time.

Thanks LD 

The lpg map line was consistently just below (within 5mm) the petrol line on the map and from day one, it has rev'd upto the rpm red line with no problems 
The Manifold Air Pressure tends to wander around anywhere between 0.9 and 1.2 bar but it seems to run ok 

Have a read through the guide to mapping... Ideally you want the lines to overlay. This is achieved by moving the points of the multiplier line up/down as needed

[JamesV6CDX]

5mm suggests it's multipliers are a little too low, to me... may be worth starting again and getting them to overlay

Most importantly, check your lambdas are not reading 0v when your foot is nailed through the carpet...

[tigers_gonads]

Thanks for the advise LD & James 
Will do 
But ................ just took the shed out for a spin this morning (swmbo to work) and its started missing and backfireing like a good un on petrol and it would hardly run on LPG 

We have 40 mph winds and its pishing down here so i'm going to have to pull it down again in morning because something ain't right big time under the bonnet 

I have changed plugs / leads / coilpack, and all the other bits that has been mentioned in this and the other thead.

Basicly everytime things get moved around, the symptoms change or it gets worse 
I'm begining to think I have a fault with the engine wiring loom 

[TheBoy]

what are trims like

[tigers_gonads]

what are trims like

Sorry, not 100% what you mean 

If you mean the o2 readings, 1 and 2 are bouncing around between low 10's and 8 or 9 hundreds 

[feeutfo]

No, fuel trims.

A measure of correction the petrol ecu adds or subtracts to give the correct fuel mixture according to what the lambda reports. It will be a + or - of zero figure. Long term being the important one. Iirc more than 20% error brings the light on with a dtc.

You need a live data capable diagnotic tool to see them.

[TheBoy]

No, fuel trims.

A measure of correction the petrol ecu adds or subtracts to give the correct fuel mixture according to what the lambda reports. It will be a + or - of zero figure. Long term being the important one. Iirc more than 20% error brings the light on with a dtc.

You need a live data capable diagnotic tool to see them.

Pre DBW don't have Long and Short term trims, they have a different setup - Idle and Partial Load. Its an integer between 0 and 255 (can you guess its an 8 bit system ), with the 'ideal' being at mid point (in the 120-135 region).

[feeutfo]

No, fuel trims.

A measure of correction the petrol ecu adds or subtracts to give the correct fuel mixture according to what the lambda reports. It will be a + or - of zero figure. Long term being the important one. Iirc more than 20% error brings the light on with a dtc.

You need a live data capable diagnotic tool to see them.

Pre DBW don't have Long and Short term trims, they have a different setup - Idle and Partial Load. Its an integer between 0 and 255 (can you guess its an 8 bit system ), with the 'ideal' being at mid point (in the 120-135 region).

8 bit? Ffs is that all? where do you shovel the coal?


Sorry tiger, missed your engine type. 

[TheBoy]

8 bit? Ffs is that all? where do you shovel the coal?

Seriously, I vaguely recollect one of the ads for a ZX81 claiming it could run a small power station

[Kevin Wood]

8 bit? Ffs is that all? where do you shovel the coal?

Seriously, I vaguely recollect one of the ads for a ZX81 claiming it could run a small power station

.. until someone wiggles that nasty 16k RAM pack whereby it's Chernobyl all over again.

An 8 bit CPU is more than adequate for running an engine management system.