afternoon all,
i am currently playing with my MS and VE table, i have a question,
1)the car is ticking over at about 600-700 rpm and seems to be struggling a little. how do i adjust the figure to make it idle at about 800, do i
increase the values?
here is the VE Table im using.
the bar idles around the 6 boxes highlighted
what happened to using a screw driver? 
whippy serious answers only, go back to ooogling!
what is the torque roughly of a 150 bhp pinto, with kent cam, and ported?
i just want to see what ve table MS will generate, but dont know that torque of my car.
[Edited on 30/7/08 by omega0684]
I think whippy meant adjust the idle speed screw.
yet have done that but still struggling to tick over.
here is the spark table that is in could in be the column of 20 in the 1st column, shouldn't this be between 12-15 degree btdc? more like this
[Edited on 30/7/08 by omega0684]
quote:
Originally posted by whitestu
I think whippy meant adjust the idle speed screw.
apologese whippy just really want to get out for a blast! brilliant sunshine here!
The engine is dropping to an idle speed where it has the optimum advance. If you alter the RPM bins on the spark table to move 700 rpm to 800 and 500
rpm to 700, then the engine should drop to somewhere between 700 to 800, rather than 700 to 500. If that isn't enough, you will need to increase
the physical throttle stop to allow more air.
Alter the fuel table to bring the AFR to between 14 and 14.7. The recommended way is to tune for lowest MAP value at idle.
with the values i have in at the moment the AFR is about 13:1, what do i have to do to the values to get the AFR up
its reading my kPa to be about 92-94 at idle, is this in the right region?
another question, what is autotune?
[Edited on 30/7/08 by omega0684]
quote:
Originally posted by omega0684really want to get out for a blast! brilliant sunshine here!
want to get a reasonable fuel consumption, its running but its rough as a bear after a night out on the vodka! the engine timing at idle is causing the whole engine to shake quite violently so i dont want to think what its like at high rpm
ITBs are notorious for inadaquate MAP resolution. If you are running 92-94 kPa at idle, and there are no leaks, you need to switch over to Alpha-N
(TPS based) fuelling.
AFR is the air-to-fuel ratio, so the higher the ratio, the more air is needed (i.e. less fuel) so you will have to decrease the VE values. 13:1 is
rich for a regular engine, but the more highly tuned the engine, the richer it needs to be at idle.
oh I see, the colours represent the flame colour like when using a colour tune.
The colours don't really mean anything. They just change colour from blue at the lowest values to red at the highest values. They don't actually relate directly to the mixture. The entire table could be too rich and the colours wouldn't change.
oh
If the VE table is volumetric efficiency how can you get over 100% volumetric efficiency?
Also; if you're ticking over at 90 odd Kpa why does your table read as low as 30Kpa - I would have thought (and I may well be wrong!!) with the
throttle closed/ticking over the MAP reading would drop to it's lowest reading. So why have lower values in your VE table?
should i have the values say from 50-100 then?
[Edited on 30/7/08 by omega0684]
you've got plenty of advance (unless it is a wacky rally cam) and a surplus of fuel so I would also suggest opening up the throttle...increasing the VE table for the idle region will just run even richer than you are already (which is quite rich).
so i need to reduce the values in the idle region?
The VE table is only volumetric efficiency if you are aiming for 14.7 AFR over the whole table and the Req Fuel value is spot on. I choose to half the
req fuel to double the values in the VE table, so I have effectively twice the precision in each cell.
>100% VE is theoretically acheivable on NA motors using pulse-tuning of the headers.
The MAP value will be lowest on over-run. I have 50 kPa at idle, and get as low as 15 kPa on over-run. At least one row should be dedicated to
over-run if you don't use fuel cut.
8 kPa isn't enough resolution to use SD fuelling. You need to use Alpha-N.
if its idling at 90kpa you will defo need to switch to alpha n
ok then, has anyone got a pinto alpha N ve table they can e-mail me that i can work from.
if its idling at 90 kpa there is a vacuum leek between inlet manifold and megasquirt
The config file needs resetting for Alpha N, there is a setting in the config files under Car 1 settings.Also in the settings menu in megatune.
It should work in SD with some trial and error, My zetec ticks over at 45 kpa and goes down to below 20kpa on over run.
Have you got all the vacuum points on the TBs connected and the throttle bodys balanced correctly?.
You need to get the vacuum at idle down before you try tuning the map at all as you have only 1 line of usable map at present.Set the idle advance to
12 degrees in all the boxes around idle to start with.
Paul.
quote:
Originally posted by omega0684
ok then, has anyone got a pinto alpha N ve table they can e-mail me that i can work from.
summat wrong somewhere wih an idle of 90kpa