With a MAF car setting the MAF tables all to zero results in little fuel being injected. Some still is though for whatever reason.
Will setting the VE table values in a MAP ecu, all to zero result in almost no fuel being injected?
I just dont want my car to inject gas but a side effect of this with a MAF car is that LV8 values cannot be calculated so my spark table is meaningless.
With a MAP 7730 ecu it would still see LV8 from the MAP sensor so my spark table would be OK? Even with the VE table values all zero.
Hope someone understands me. I dont want gas injected as I'm on propane.

Simon

 

Interesting. There are other factors that can come into play to inject fuel. Best bet is to set the rev limiter to a low RPM setting.

Seems I am missing something. If on propane and a VE table of zero's, then would the fuel line be hooked up? Another method might be to switch off the fuel pump.

RBob.

 

Simon?
From Down Under?.

Anyway, sometimes 0's in the table just screws up the ecm's thinking. You can 0 out the Coolant Temp corrections and be fine, put a 0 in the main spark table, and what the value dance around from 0 to 90d.

Pull the injector fuses, and fuel pump fuse.

 

[QUOTE]Originally posted by Grumpy
[B]

Simon?
From Down Under?.


Never mind I just woke up.........

 

I need to give you some more information here about my car. I have described my system in previous questions but here is a reminder.

My car runs on propane and the control/injection system is completely seperate from the standard ecu controling the gas. The problem is that propane system cannot provide enough fuel under high load conditions ie when you floor it or are seriously breaking the speed limit. It is almost OK but not quite.
With my MAF system at MAF voltages above 3.2V the mixture goes lean so in the MAF tables I add gas to compensate. I subtract the airflow value at 3.2v from higher voltages to work out the values.
So my MAF values below 3.2v are zero but it does still inject gas I can tell because I can hear the injectors at idle and the fuel gauge goes down.

My main question is if I convert to SD are the VE tables the equivalent of the MAF tables so setting there values to zero will result in very little fuel injected?

Rbob, that is a good point about using the rev limit to switch off the fuel pump I had thought of that but the injectors will still operate and will overheat/be damaged if there is no fuel. Also in response to you and Grumpy I cannot fully disable the gas as I need it for top end power.

Can you guys see why SD may be better for me. LV8 is calculated from MAF and RPM but most of my MAF values are zero so it sees no load and ignition tables are screwed up. I dont think I would have this problem with SD but something else is sure to crop up.

BTW I'm still trying to work out if a 27c512 eprom will work instead of a 27c256 in a 7730 ecu, anyone?

I'm from the United Kingdom, Great Britain, England, Britain what ever you call us.


Thanks guys

Simon