Hey up everyone, I'm back in an LCR after almost a 2 year break - it's an AMK with a P-Torque stage 1 map, however there seems to be a slight issue with fuelling... I've been doing a bit of searching and reading and running lean definitely seems to be a fairly common issue with the old 1.8T engines...
As far as I can gather, the stock map should be requesting around 0.95 lambda under load, but the general consensus is one of the parameters adjusted during a remap should be the fuelling, which should be richened to 0.8x under load in order to combat pre-combustion as a result of running higher boost+advanced timing?
I have done a couple of logs of block 031 in Vagcom and my car is requesting 0.953 lambda right up to about 6000revs, where it starts to request a slightly richer mixture round the 0.8 mark. As far as I know, this is the correct pattern of fuelling, but is delayed until a bit too far up the rev range - I'm led to believe that it should be richening up from lower down the rev range, around 3-4000 rather than just before the red line?
I understand that fuel supply (filter/pump/fpr) or air supply (boost leak/vac leak/faultyMAF) would affect actual fuelling, but surely the only thing dictating the fuelling request are the parameters defined in the fuel map? Does anyone (hoping Will will read this) know what the P-Torque fuel requests should be as standard to see whether I have an issue with the map itself?
I have also checked my fuel trims, which are currently sitting at 9.0 and -12.5% respectively.
As far as I know the first figure would indicate that I have a vac leak?
When I saw a negative value on the second figure I thought this mean that the engine was running rich and was having to lean out the mix to hit the fuelling requests... I am now thinking this may be the other way around and the engine is infact running lean and trying to richen the mixture - this is because I am receiving a 'bank 1 too lean' error code in Vagcom (I can get the exact fault code later but am in work at the mo).
Can anyone give some advice on this? I have some ideas on what I think is going on but wouldn't mind someone else's view to see how it matches up? I can post my existing logs and I am happy to run more logs if needed.
As far as air goes, boost is hitting requested (around 1.2/1.3bar) and the boost gauge in the car tends to sit happily just below 20psi generally. MAF readings are around 200g/s so these are also as expected (MAF was faulty when I bought car which I have since replaced).
Cheers
Ben
As far as I can gather, the stock map should be requesting around 0.95 lambda under load, but the general consensus is one of the parameters adjusted during a remap should be the fuelling, which should be richened to 0.8x under load in order to combat pre-combustion as a result of running higher boost+advanced timing?
I have done a couple of logs of block 031 in Vagcom and my car is requesting 0.953 lambda right up to about 6000revs, where it starts to request a slightly richer mixture round the 0.8 mark. As far as I know, this is the correct pattern of fuelling, but is delayed until a bit too far up the rev range - I'm led to believe that it should be richening up from lower down the rev range, around 3-4000 rather than just before the red line?
I understand that fuel supply (filter/pump/fpr) or air supply (boost leak/vac leak/faultyMAF) would affect actual fuelling, but surely the only thing dictating the fuelling request are the parameters defined in the fuel map? Does anyone (hoping Will will read this) know what the P-Torque fuel requests should be as standard to see whether I have an issue with the map itself?
I have also checked my fuel trims, which are currently sitting at 9.0 and -12.5% respectively.
As far as I know the first figure would indicate that I have a vac leak?
When I saw a negative value on the second figure I thought this mean that the engine was running rich and was having to lean out the mix to hit the fuelling requests... I am now thinking this may be the other way around and the engine is infact running lean and trying to richen the mixture - this is because I am receiving a 'bank 1 too lean' error code in Vagcom (I can get the exact fault code later but am in work at the mo).
Can anyone give some advice on this? I have some ideas on what I think is going on but wouldn't mind someone else's view to see how it matches up? I can post my existing logs and I am happy to run more logs if needed.
As far as air goes, boost is hitting requested (around 1.2/1.3bar) and the boost gauge in the car tends to sit happily just below 20psi generally. MAF readings are around 200g/s so these are also as expected (MAF was faulty when I bought car which I have since replaced).
Cheers
Ben
