I am assuming (dangerous i know) that earths are good because the chassis was completely stripped 2 years ago and the wiring for the MS was done by Dale at Bailey Performance.
I will soon be relocating the battery to the boot and i will be using brand new 50mm sq. positive and the same size for 2 earths to the chassis and engine. If i still have problems i will double check all other earths.
dbv8 wrote:I am assuming (dangerous i know) that earths are good because the chassis was completely stripped 2 years ago and the wiring for the MS was done by Dale at Bailey Performance.
I will soon be relocating the battery to the boot and i will be using brand new 50mm sq. positive and the same size for 2 earths to the chassis and engine. If i still have problems i will double check all other earths.
Check them anyway, 2 years is a long time for TVR electrics. I am not saying it has been done wrong just that its more than possible to have degraded since being done.
dbv8 wrote:
My TVR is currently running well on MS2 in normal day to day use.
I noticed at the dragstrip that when i switched on my nitrous bottle heater that the wideband would suddenly rise to very weak levels.
Recently i have noticed that even if the fans kick in or when i switch the headlights on it has a similar effect to a lesser degree.
Do i have an inherent electrical problem or can i somehow compensate to keep the car running as it should no matter what i switch on?
MegaSquirt adjusts the injector opening times to compensate for battery voltage - or rather the voltage it gets. Are you certain this is correctly set?
But obviously it expects a reasonably clean supply - including the ground.
MS should have its own supply direct from the battery, and not shared with anything else. Also its own ground direct to the engine block. And due to the type of connector it uses, there should be (at least) three 1mm or greater ground wires from the connector to the block, with each wire connected to two or more terminals.
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
Dale uses my ECUs as a rule, so it should have one of my looms as well.
Ensure all 4 ground wires on the loom are wired back to the engine block, also ensure the wideband has 2 ground wires that run seperatly to the engine block, one should go back to the MS ground point.
Sounds to me like the ground for the wideband are on the battery or the chassis, which isnt correct
thanks
Phil
daxtojeiro wrote:That does sound like a grounding issue.
Dale uses my ECUs as a rule, so it should have one of my looms as well.
Ensure all 4 ground wires on the loom are wired back to the engine block, also ensure the wideband has 2 ground wires that run seperatly to the engine block, one should go back to the MS ground point.
Sounds to me like the ground for the wideband are on the battery or the chassis, which isnt correct
thanks
Phil
Yes i bought the full kit off you Phil and let Dale wire and map it. Ran very well and i had a remap after i made some changes but the problem showed when using the bottle blanket at Shakey. Its getting worse now and even switching on the headlights can have an effect. I am sure the earths are in the correct places (will double check). I will clean up and secure all the earthpoints i can find and report back.
Its the position of the grounds that I suspect, but clean them up anyhow
Also check for a pair of grounds on the wideband, these mustnt connect together at the controller and then run as one wire to the ground point, they should be connected as a pair to the ground point (engine block) although the heater ground could run else where without any issues,
Phil
