Gtr_lee

Managed to do the VVT calibration this afternoon and it now floats around 0 at idle with around 30ish% duty cycle. I don’t know how it got the number it did in the first place, I definitely calibrated it at 2000rpm. I remember reading a post Adam replied to with instructions on how to do it, so I screenshot what you said and did it the next day. I will see how it drives in an hour or so while on the way to an MOT and fingers crossed all is good and it passes. Will make sure to get a few logs and report back with an update. appreciate all the help.

I will give that a go later and see if it changes anything. I did think it was strange how at barely any throttle and rpm it was sometimes shooting up to 80kpa and turbo spooling up like mad. Just had a look through your tune file, the one the local tuner sent me and the stock base map. My no1 VVT tooth offset looks a bit off compared to the others especially compared to the base file and the one the local tuner sent. They both has an offset of around 90 and mine is 203. Could this be causing my issues? I had to rebook the MOT for this evening. So going to have a play when I get back from work.

I did do the VVT angle test when I first got it up and running but I will try it again in case I did not do it correct. I did notice the angle never really changes from 9 degree advanced regardless of target. Yes, timing was set and I double checked this a couple of days ago to make sure. thanks for the tune, I will have a look in the morning to see what I could be missing to make mine run so bad. I am using EV14 0280158235 713cc injectors. They come with the Kraken turbo kit. I have noticed that too actually when I had the car idling for long periods. I had a walbro 255 pump in originally, which seemed to also make it worse! Figured out it was overpowering the stock reg in the tank, so put the stock pump back in. Made it slightly more manageable.

I know that it was a sample map and is just to get it started, the reason I got the an mx5 and put a link on it in the first place was to teach myself how to tune. I have spent a decent amount HPA courses and read hours and hours of info from this forum. I get that the easy way out is to just get someone to do it for me, but I like trying to have a go myself. I have made the changes in the ecu myself apart from the ignition table which a local tuner sent me to try. It is the first time I have attempted to even drive the car today. If it's a case of there is nothing seriously wrong and it just needs more work on the tune, then I will just keep having a go until I figure it out.

No, has not been tuned before. Had a new ecu sent over from NZ after my orginal one needed the mod for the VVT. Because it was unopened and the guys in the Uk couldn’t do the mod they agreed to send a new one.

I had an MOT booked today. Tried to drive round the block a few times to collect some data before I went to the MOT station. I was using the math block that lets me use mixture map with closed loop active. But the car was driving pretty bad Was trying to cut out when coming to a stop and did cut out once, Map readings seemed very high with barely any throttle. Afr's were all over the place even after making adjustments using the logs. Something is definitely not right at the moment. While I had it on the drive I had adjusted fuelling out of closed loop and got idle stable and it seemed to run smooth. Could someone take a look at my log and tune file to see if they could spot something. PC Datalog - 2024-04-4 6;23;40 pm.llgx Lee MX5 Back up Traditional from 1.4.24.pclx

I will load up that dead time table tomorrow and see what happens. Thanks In the mean time I have been doing some reading, part of my issue looks like it could be my walbro 255 pump over powering the stock regulator in the tank. A guy on the miata forum was seeing pressures of 80psi at idle and it would fluctuate too. Would explain why my afr’s never stay stable. Will look in to buying a return style set up with fuel pressure/temp sensor

The tune is in the first post I made. I must of made a mistake somewhere then if that is the case. I will redo the deadtime table and check again. The only reason I looked in to deadtimes in the first place was because the VE numbers are really high at idle and idle afr’s were constantly moving after setting it at lambda 1. I will see if i can dig out a decent log when I get back home.

No I haven’t got a fuel pressure gauge or sensor at the moment. But is on the shopping list. Changing to a return style system with an adjustable regulator might be the way to go in the future. I made a 3d table just like you showed above but because I don’t have a pressure sensor it just sat in the 250kpa/14v row the whole time. Ended up going back to a 2d table. I actually ended up with the value of 1.060 for 400kpa at 14v to get it closer to where it wants to be. I am in the UK and have not got an Mot or road tax as the car has been off the road for over a year. Which means I can’t drive on the road to test and log at the moment. Should hopefully be on a dyno soon.

Tried doing the test yesterday and change dead times to try and get afr to track after changing target table. But something doesn’t seem right. I would change it from Lambda 1 to 0.9 and it would overshoot to 0.82-0.85. So would adjust dead times up and repeat the process. But no matter what I changed the dead times to I couldn’t get it to track. It seems even if I don’t change the dead times at all and get it bang on Lambda 1, change to 0.9 and then back to 1, it will overshoot past Lambda 1 to 1.1-1.2. It’s like it’s constantly changing. I didn’t have any fuel corrections on at the time so that shouldn’t have affected the test. Any ideas?

Thanks for that dx4picco I am going to do the test that KOracing shared in the post above later today. I take it that once I have filled out the 3d deadtime table, I can highlight the whole table and move all deadtimes up and down until I can get more realistic VE numbers?

How do I go about setting up a dead time table for that?

Thanks for sharing that post, will give that a try this week. As for the dead time table with differential fuel pressure, do I need a fuel pressure sensor for that to work? As I do not have one installed at the moment.

Hi, Could someone take a look at my tune to see if they can spot something wrong with the set up please. It's a mk2.5 mx5 turbo that runs 4bar return less system with walbro pump The Ve at idle is really high and in the 80's which does not seem right. I am using bosch 0280158235 injectors that come with the turbo kit. I found what I thought was good data on them from Finjector - pic attached Please ignore the majority of the Ve table, It's not been touched and I have only tried to get it to idle and get afr's ok by revving up to about 3,000rpm. I stopped trying to do anything else until I can figure out why the numbers are so high. Thanks MX5 modelled Fuel 25.3.24.pclx

Hi Vaughan, I went to have a look at the connection at the ecu and can Lo had somehow snapped from the terminal in the jst plug! This is most likely the issue but cannot confirm until I get some new terminals delivered to test. But yes it was set to Lambda 1 and was wired to Can 1 in the nb2x plug in ecu. Once I have redone all the wiring I will see what happens in the runtime view if it still is not reading correctly I appreciate the help