Dear all,

I've had my original ECU remapped on my '02 Volvo V40 1.8i to improve
performance.

Now I've got an LPG system fitted (Zavoli Alisei-N multipoint sequential),
how do I ensure that the LPG system is also taking advantage of my remapped
settings in the original ECU?

Someone mentioned 'recalibrating the LPG system to the ECU' to do this.
What do they mean?
How is this done?
Are there any other ways of ensuring the LPG system is using the remapped
values from the original ECU?

Thanks,
Dave.

"Dav-G" wrote in message
k...
Dear all,

I've had my original ECU remapped on my '02 Volvo V40 1.8i to improve
performance.

Now I've got an LPG system fitted (Zavoli Alisei-N multipoint sequential),
how do I ensure that the LPG system is also taking advantage of my
remapped
settings in the original ECU?

Someone mentioned 'recalibrating the LPG system to the ECU' to do this.
What do they mean?
How is this done?
Are there any other ways of ensuring the LPG system is using the remapped
values from the original ECU?

The LPG ecu measures petrol injector ontime via the wiring harness and
subsitutes a corrected LPG injector on time accordingly, so it should
automatically fuel at an optimum level.

The re-mapped petrol ECU will possibly have more aggressive ignition advance
than standard too, which is a good thing for LPG..

Why not get it on the rollers and see how it compares petrol / lpg.???

tim.
..

Hi Tim.

So you mean that, regardless of whatever fuel pulse on-time and duration the
petrol ECU has, the LPG ECU will always refer to its own, ignoring any such
remapped data..?

So, my petrol ECU remapping won't be passed on to my LPG ECU?

So, to get an equally Sporty feel from my LPG system, I'd have to have IT
remapped as well..?

I thought the LPG system merely mirrored the petrol system, injecting when
the petrol system did, for the same length of time as the petrol system
did..?

Regards,
Dave.

"Tim.." wrote in message
...

"Dav-G" wrote in message
k...
Dear all,

I've had my original ECU remapped on my '02 Volvo V40 1.8i to improve
performance.

Now I've got an LPG system fitted (Zavoli Alisei-N multipoint
sequential),
how do I ensure that the LPG system is also taking advantage of my
remapped
settings in the original ECU?

Someone mentioned 'recalibrating the LPG system to the ECU' to do this.
What do they mean?
How is this done?
Are there any other ways of ensuring the LPG system is using the
remapped
values from the original ECU?

The LPG ecu measures petrol injector ontime via the wiring harness and
subsitutes a corrected LPG injector on time accordingly, so it should
automatically fuel at an optimum level.

The re-mapped petrol ECU will possibly have more aggressive ignition
advance
than standard too, which is a good thing for LPG..

Why not get it on the rollers and see how it compares petrol / lpg.???

tim.
.

On Sun, 4 Mar 2007 01:28:00 -0000, "Dav-G" wrote:

Hi Tim.

So you mean that, regardless of whatever fuel pulse on-time and duration the
petrol ECU has, the LPG ECU will always refer to its own, ignoring any such
remapped data..?

No. He means that the LPG injection pulse time tracks the petrol
injector pulse time. LPG ECUs are stupid, they don't have "maps" they
just convert pulse time taken from petrol ECU to one for LPG injector.
You may on the better ones get different conversions for cold, idle,
cruise and high load. If the person doing the mapping could be arsed
to set it up.

So, my petrol ECU remapping won't be passed on to my LPG ECU?

The LPG ECU has no mapping it's just a pulse time converter. Whatever
injection pulse the petrol ECU outputs the LPG ECU converts.

So, to get an equally Sporty feel from my LPG system, I'd have to have IT
remapped as well..?

No. Not unless it wasn't calibrated to your petrol injectors in the
first place.
If the LPG injectors need a longer on time than petrol injectors you
may have a problem at high load as they can max out. For example if
conversion petrolLPG on time is 1.1 and your re-mapped petrol
injectors hit 92% duty (time on/(on+off) ) then your LPG injectors
need 101.2% duty, which is not possible.

I thought the LPG system merely mirrored the petrol system, injecting when
the petrol system did,
Correct
for the same length of time as the petrol system
did..?
Changes pulse length - injector "on" time. (what Tim said)
--
Peter Hill
Spamtrap reply domain as per NNTP-Posting-Host in header
Can of worms - what every fisherman wants.
Can of worms - what every PC owner gets!

Hi Peter,

Can you describe what you mean by 'duty time'?
E.g. 92% of what?

'Time on/(time on + time off)': What?

Surely the limiting factor would be the duration the inlet valve is open
for.
Do you mean 100% = inlet valve open total time?

All sounds very interesting.

So, the LPG system tracks the petrol injector on-time and pulse width (thus
also being affected by remapping), but modifies it into an LPG-friendly
version, with slightly different (earlier?) on-time and pulse width
(longer?)..?

If my LPG system was fitted after my remapping, would this mean that the LPG
system has been calibrated to the remapped petrol ECU?

What exactly does 'calibrating the LPG system to the petrol ECU' consist of?

Thank you for your insights.
I'm appreciating the information!

Regards,
Dave.

"Peter Hill" wrote in message
...
On Sun, 4 Mar 2007 01:28:00 -0000, "Dav-G" wrote:

Hi Tim.

So you mean that, regardless of whatever fuel pulse on-time and duration
the
petrol ECU has, the LPG ECU will always refer to its own, ignoring any
such
remapped data..?

No. He means that the LPG injection pulse time tracks the petrol
injector pulse time. LPG ECUs are stupid, they don't have "maps" they
just convert pulse time taken from petrol ECU to one for LPG injector.
You may on the better ones get different conversions for cold, idle,
cruise and high load. If the person doing the mapping could be arsed
to set it up.

So, my petrol ECU remapping won't be passed on to my LPG ECU?

The LPG ECU has no mapping it's just a pulse time converter. Whatever
injection pulse the petrol ECU outputs the LPG ECU converts.

So, to get an equally Sporty feel from my LPG system, I'd have to have IT
remapped as well..?

No. Not unless it wasn't calibrated to your petrol injectors in the
first place.
If the LPG injectors need a longer on time than petrol injectors you
may have a problem at high load as they can max out. For example if
conversion petrolLPG on time is 1.1 and your re-mapped petrol
injectors hit 92% duty (time on/(on+off) ) then your LPG injectors
need 101.2% duty, which is not possible.

I thought the LPG system merely mirrored the petrol system, injecting
when
the petrol system did,
Correct
for the same length of time as the petrol system
did..?
Changes pulse length - injector "on" time. (what Tim said)
--
Peter Hill
Spamtrap reply domain as per NNTP-Posting-Host in header
Can of worms - what every fisherman wants.
Can of worms - what every PC owner gets!

"Dav-G" wrote in message
k...

I thought the LPG system merely mirrored the petrol system, injecting when
the petrol system did, for the same length of time as the petrol system
did..?


It does- thats what I said...

Tim..