DIY tuners and mappers unite
Discussion
I would be interested on thoughts and opinions on mapping our Rover V8s. It would be good to see other peoples AFR, fuel and ignition tables.
Ive finally took the plunge and started mapping my MS2 on the fly. I originally had it mapped by Dale at Bailey Performance who was excellent and the car drove perfectly. But i had to do a full engine rebuild late last year and used some diffenent parts. A fresh set of injectors probably being the main contributor to the car running rich.
So upto now ive got my cruise AFRs up into the high 14's nudging into 15's at anywhere from 75 to 90 between 2000 and 3000 rpm and ive richened up the very low throttle/ low rpm to almost eliminate shunting completely. I want to do full throttle next as its a little weak then moves a little rich. Maybe a good idea to let someone else drive while i tune it. Very happy with my results so far but i realize i am very early on the learning curve and am keeping all previous maps to step back to just in case.
Ive finally took the plunge and started mapping my MS2 on the fly. I originally had it mapped by Dale at Bailey Performance who was excellent and the car drove perfectly. But i had to do a full engine rebuild late last year and used some diffenent parts. A fresh set of injectors probably being the main contributor to the car running rich.
So upto now ive got my cruise AFRs up into the high 14's nudging into 15's at anywhere from 75 to 90 between 2000 and 3000 rpm and ive richened up the very low throttle/ low rpm to almost eliminate shunting completely. I want to do full throttle next as its a little weak then moves a little rich. Maybe a good idea to let someone else drive while i tune it. Very happy with my results so far but i realize i am very early on the learning curve and am keeping all previous maps to step back to just in case.
As far as the shunting goes, rich ending it up improves it, that's what Austec did but Shaun had a different approach.
He set the AFR back to normal and reduced the advance on the ignition timing at that point. The shunting I had was completely lliminated.
Happy to do the driving Derek and share my map.
He set the AFR back to normal and reduced the advance on the ignition timing at that point. The shunting I had was completely lliminated.
Happy to do the driving Derek and share my map.
I can see me coming back dar sarth in the Chim again next week.
Need to do some man maths to justify.
I only get 33 mpg out of the Mazda anyway. Ive had 27 mpg out of the TVR and with recent mapping and if i drive at 85 max i should achieve that again. Can then take the car to Peters for a map and play day next weekend.
Maybe i should also get that McLeod RST and fly ordered from Real Steel and get it fitted asap ahead of a rolling road shootout
Need to do some man maths to justify.
I only get 33 mpg out of the Mazda anyway. Ive had 27 mpg out of the TVR and with recent mapping and if i drive at 85 max i should achieve that again. Can then take the car to Peters for a map and play day next weekend.
Maybe i should also get that McLeod RST and fly ordered from Real Steel and get it fitted asap ahead of a rolling road shootout
macdeb said:
How much have you backed off advance on Nitrous map bloke?
The second Ignition map looks has 6 degrees taken out at everywhere above 85% throttle.I will probably alter this too. Maybe keep 6 degree at activation (3-3.5k) then cut the retard down to just 2 degree at full rpm.
You're missing a whole world of economy in that ignition map db, and are you running lambda trimmed feedback with learning or just just trimming with no learning? If your ecu is learning you would benefit from changing the ms/bit and getting much better incremental resolution in the fuel map. at the moment you're limited to a smallest fuel change around idle of 5%, you could get a smallest change of 2% just by re-jigging your fuel numbers.
spitfire4v8 said:
You're missing a whole world of economy in that ignition map db, and are you running lambda trimmed feedback with learning or just just trimming with no learning? If your ecu is learning you would benefit from changing the ms/bit and getting much better incremental resolution in the fuel map. at the moment you're limited to a smallest fuel change around idle of 5%, you could get a smallest change of 2% just by re-jigging your fuel numbers.
Lamdas arent used. Was mapped on the rollers and now on the move.Can you explain further where you think i can make some improvements please.
Chilliman said:
Derek, which version of tuner studio are you using?
I'm trying to use MS Lite v2.0.8 - EFI simplified but I can't open my last map in it.....
Ta,
R.
Mega Tune 2.25 p3 modified for MS2-Extra by ExtraEFI..... apparently.I'm trying to use MS Lite v2.0.8 - EFI simplified but I can't open my last map in it.....
Ta,
R.
Its what came with the laptop that Neal so kindly donated. Thanks again Neal
phazed said:
As far as the shunting goes, rich ending it up improves it, that's what Austec did but Shaun had a different approach.
He set the AFR back to normal and reduced the advance on the ignition timing at that point. The shunting I had was completely lliminated.
That does work and does so by effectively forcing you drive the car with more throttle at that point - doesn't cure the problem but can mask the symptoms and is a good work around He set the AFR back to normal and reduced the advance on the ignition timing at that point. The shunting I had was completely lliminated.
Great thread Derek. Was thinking of starting a similar thread myself but you beat me to it.
I’ve just finished upgrading to wasted spark from fuel only megasquirt. But haven’t really had chance to do any mapping yet other than setting it up for idle and warm up using my original fuel only table as a basis.
However, I did take the car out for a first run on the coil packs on Sunday and immediately noticed a huge difference in the engine response and drivability. Although this may be partly due to the poor condition of the old dizzy. The car also starts and idles much better now.
I have a set of larger injectors to install at the weekend, so not much point in posting my fuel table until I at least have a decent base map with the new setup.
For the ignition advance I think I’ll stick with the base table provided by Phil at ExtraEFI, until I can get the car mapped on the rollers later this month as I don’t have the expertise or confidence to mess with this yet. However, I did notice that my table has much higher advance (low forties)than yours, in the cruise area between 1800 and 3000 RPM, which I assume is to improve fuel economy. I might tone this down slightly before driving again as I’m a bit nervous that this is too high.
I’ve just finished upgrading to wasted spark from fuel only megasquirt. But haven’t really had chance to do any mapping yet other than setting it up for idle and warm up using my original fuel only table as a basis.
However, I did take the car out for a first run on the coil packs on Sunday and immediately noticed a huge difference in the engine response and drivability. Although this may be partly due to the poor condition of the old dizzy. The car also starts and idles much better now.
I have a set of larger injectors to install at the weekend, so not much point in posting my fuel table until I at least have a decent base map with the new setup.
For the ignition advance I think I’ll stick with the base table provided by Phil at ExtraEFI, until I can get the car mapped on the rollers later this month as I don’t have the expertise or confidence to mess with this yet. However, I did notice that my table has much higher advance (low forties)than yours, in the cruise area between 1800 and 3000 RPM, which I assume is to improve fuel economy. I might tone this down slightly before driving again as I’m a bit nervous that this is too high.
Edited by angus99 on Tuesday 9th April 14:03
angus99 said:
However, I did notice that my table has much higher advance (low forties)than yours, in the cruise area between 1800 and 3000 RPM, which I assume is to improve fuel economy. I might tone this down slightly before driving again as I’m a bit nervous that this is too high.
I think this is the area spitfire4v8 was referring to on mine. I am going to add advance here and recheck AFRs and see how it goes.Edited by angus99 on Tuesday 9th April 14:03
Can you take a snapshot of your sparktable for me please to compare.
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