Lawrence martin

thanks for the reply, be as blunt as you like i wont take offence, the reason i stuck with tps is that ive spent alot of time on it and did try mgp briefly but it still acted the same i will bin my map and start over, i just found tps easier to understand than the mgp then a tps overlay the o2 sensor is in the decat silencer which is after the downpipe, the car is an nissan r33 gtr, fuel flow is 3bar idle and runs a split feed to a sard fuel rail, never less than a quarter of a tank, the ignition dwell timing is set to 1.7ms they are splitfire coilpacks but i cannot find the dwell timing settings anyway for then apart from they are 1.7ms at 14v injector dead times are set to 0.95 and timing ids set to 400degrees they are sard 700cc with the standard timing of 0.65 ther car barely runs( i am thinking of changing these to the injector dynamics 1000cc's) its an xtreme ecu using adapter link and ive run a earthing kit in the engine bay, water and air temp stay solid air temp goes up at idle down when driving coolant always at 67 degrees when warmed up (using bosch sensor), fitted a new battery fuel pump has same as battery voltage as ive bypassed the fuel pump speed ecu to give it full 12v constant the reason i want to do this myself is that i find it very interesting for one, ive done all the work on the car myself and want to ideally keep it that way, also ive used 3 tuners before and all 3 have had great reputations, the tunes were to say the least, alot worse than ive been able to do myself this has cost me about £400, each time and has been a waste of alot of money i am very very reluctant to spend this again especially as ive just moved house and am getting married next month (so money is short) eveyone has to learn somehow i even assume the professionals need to learn by trying things themselves!

hi thanks to you ive sorted this anyway with the better resolution mgp mapping but it would still be good then you can use the ecu as an inbuilt turbo timer or for other things

ive been out today to try to fix this issue, i am sticking with tps vs rpm for fuel table 1 as i logged it happening and it seems to be very small fluctations in mgp causing the issue, especially after turning off vehicle then restarting after a couple of mins so i setup up 5d fuel as a mgp correction spanning it from -70 to -30 and rpm from 500-1200 the areas where idle is are roughly in the middle, i then logged and adjusted to get the right values it took absolutley ages but it seems alot better i still had to remove 6% of fuel at 20 degrees but at 30 and 40 degrees its all good with 0 adjustments on the iat im not sure why i had to remove the fuel there but it was making it too rich below 25 degrees after adjusting the mgp values when iat warmed up over 25, air temp def affects it somehow as there is still no warmup active at these values

Hi dave thanks for looking at my map I also have a log now if you want me to send it to you I am pretty determined to sort this myself every tuner to which I've been to before charges a fortune for a not 100 percent map which I understand as different variables cause different results which may not be reproducible in the setup they have/use also I can't really afford to spend 100s of pounds on trying to sort this issue The way I have setup My map was recommended to Me by Simon off of here I'm Not sure how much I can change to be a mapping fault unless it's a setting I've Missed surely it's just getting that cells fueling correct and timing correct ESP at idle what more is there to do apart from stuff such as the iat control which really i shouldn't need to use at these temps I'm sure you know what your talking about and I really thank you for your help I'm just not sure what I need to change to sort it out ( I did try mgp but without 4d activated and It behaved the same as tps as per the fault, is it your thought that there is a slight variation in mgp that needs sorting at these temps then using the tps to ovelay?) Again many thanks I know Osborne critical it's just that the rest of the map makes the car drive great! Regards Lawrence

the problem is that depending on how you wire your inputs it effects how you setup your ecu hence why you cant really get any base maps unless you are plugin of course

hi dave ive sent my map to you in an email, as per your quotes i did also say that it always ran nice and smooth which the link does not its barely running and cuts out sometimes when it happens

if im suffering from heatsoak what can be done about it? as when i leave the car for half hour then go back to it the afrs are really lean 18-21 as the iat is around 40-45 much leaner than when reaching the same temp on idle then a quick drive and all lowers its ok the weird thing is i never had this with the power fc and my setup is the same except the link

as above really is it possible to include a timer for the length of time you can switch on a virtual auxillary for example if i have a heatsoak issue and wanted to switch on increased fuelling if the iat is above 40 degrees and throttle position below 10% for say a minute to compensate for the heatsoak

one other thing what should my fuel equation be at im using tps vs revs on the fuel table and mgp on the 4d my equation is load = map should i be using bap or x over?

well i played around with injector lag yesterday and no difference however studying the run times has revealed that the voltage from the tps lowers with the heat going up, im guessing meaning that the ecu tries to remove more fuel giving me my lean issue it starts at 0.8%tps and 0.41v to 0-0.1% and 3.9v at 35degrees if i slightly hold the throttle open and recreate the 0.8 with my foot then the afrs look ok, now i just have to work out why its doing it, im guessing an engine earth problem for that sensor, as all others look ok

hi ive installed the bosch coolant temp sensor and that didnt fix it, is it possible that its an injector lag problem? maybe that the spray pattern is not correct and the temperature cause it to atomise early? i use sard 700cc had them cleaned before installation and all are ok and the lag time is set to 0.95ms the manufacturers time wouldnt even let it idle, im wondering trying to bump this up a bit more and see if it makes a difference again there is no correction active on the warmup or iat tables (so really the sensors arnt doing anything apart from reading) i do remember when i had the pfc installed it did idle at around 17afr, i thought this was the pfc leaning it out to get the correct idle speed (as it always ran really smoothly at idle) but maybe more is going on than i thought?

hi even if it did have heat soak then it shouldnt do anything when the trims are set at zero for those temps anyway should it? (which is what i have set)

hi martin thanks although i struggle to find time during the day is evenings or weekends ok? i went to work in my car today this morning at 7am iat were at 15-20 idles at 14.7 afr spot on on the way home at 5.30pm iat started at 20 14.7 afr then up to 30 and afrs up to 15, between 30 and 40 (sitting idling) afr changes from approx 15 to 16, coolant temp is ranging from 65 to 85 going up with iat no ect correction is active iat temp sensor is calibrated correctly but there is no iat correction at these temps at idle anyway ect sensor is not calibrated correctly i have ordered the bosh unit but cant see how it will fix it as it reads 65 at 65 and 68 at 80 both positions where there is no correction the problem only really occurs at idle driving it behaves pretty much as it should do

Hi thanks for the reply my iat is located in the intercooler pipework just before it enters the manifold which is the recommended place on the gtr it was supplied from link so should be good. All warm up enrichment is off when it happens. Unfortunately I can't measure fuel temperature but this may be the issue as i have braided fuel hose but if you sit at idle with it fully warmed up you can see from 30 degrees to 35 degrees iat it becomes leaner by 1-2 afr you can hear the change in the engine also. My main issue with the experienced tuner bit is there are very few in the uk that ARE any good and many who claim to be and they are along way from me it should be something I can fix myself I will check sensor calibration tonight

hi my tuning is now going well! but have come across another problem, as it was a nice warm day today i was seeing inlet temps of 30 degrees and it needed adjustment on the iat table however as the temps went up the afr leaned out needing me to add more fuel not take away, i always thought (and the help menu confirms this) that higher temps means thinner air which needs less fuel is there an easy explaination for this (ive had to add 7% at 40 degrees to keep the idle at 14.7

hi having a few different issues now! the knock control im not sure is working correctly with timing set at 10 degrees at full throttle at actuator power i see readings in excess of 100 on the knock scale and it retards the ignition, i connect det cans as well but i cant hear any knock (i connected to the bracket for the engine hoist on the cylinder head at the front) only mainly happens in 2nd gear i tried different frequencies which made no difference or worse but im not sure what is a good number for the knock to go to as max is over a 1000 - which im sure is engine rebuild territory! also with the 4d overlay you cant adjust the cells higher as it only allows a max of 11 rows and your map starts at 50 but i cant set that as the lower limit it only allows -100 or -80 and then up in increments so the max pressure is 100 mgp which wont be enough for the boost i will run so i could run map but then i would have no altitude correction is there any way round this?

hi updated been out in the car and its alot better now no more leaning out thank you ever so much! And i think i realised why i need the mgp, is it so i can run different boost levels etc? as it only knows the throttle position so without a mgp overlay it will run lean or rich depending how much boost i add/remove

hi simon thanks for that just to get this right this is the way i see how it works please correct me if im wrong use the throttle postion for the main fuel table then use the mgp as an overlay where the figure refer to a percentage of the main fuel table, so a figure of 2 is adding 2% ontop of whatever the fuel table reads? can you just explain why i need to do this, i am very much a novice at mapping and only have used the power fc before hand why do i need to have more fuel than the throttle position alone? and also how will i know where i need to add these additional percentages? sorry!

hi i also have a log to look at it happening around 10 secs in if you look at the parameters of rev,mgp, tp, accel enrichment and wideband it shows the acceleration enrich is not active when going from 60% throttle to 100% the reason my wideband only shows a max of 16 is that ive lost the cable for the lm 1 (as i set it up for the power fc i had before and need to reset it)

sounds good are there no plans to incorperate the vipec table into the link stuff? as that would be really handy, i tried the xy plot table as it appears on the logging screen but i could not make out the marks as it was way to small and i couldnt work out how to enlarge is the next release due soon?

hi simon i have sent my ecu file to you via email many thanks lawrence

hi i am trying to tune on my own on the street which is quite difficult but possible, i am used to the datalogit of the power fc which gave you a 20x20 table the same as the fuel table which the afrs from the wideband were input to, i found this really easy to get a smoother map as you could tell which were the torublesome cells straight away also it had a "ghost" function which would highlight the boxes used in colour then you would press f5 and it would erase it and it would start again automatically, the links trail it seems very hard to use you have to manually record then play back whats happend and the little asterix are hard to see, at least coloured boxes would be easier!

hi ive got a link g4 xtreme and have fitted it to my r33 gtr it all runs well but im having an issue with what i think is the acceleration enrichment, when i go light throttle its ok but when i use full throttle or a quick dab of the throttle it seems the enrichment is turning off too early and it leans out, basically the more throttle the worse it is, its not the fueling map as i put in some really high numbers to check and its fine once its got past that bit hopefully i have a screenshot of my setup attached if i increase the hold it doesnt make any difference as well as decreasing the decay, if i increase the main table numbers in the engine speed again just makes it richer but still get the lean spot, if i take a log of it you can see the enrichment at 68% then to nothing with the throttle at 99% any ideas of where to go with it all?