Last edited by Matheus428; 27-01-2005 at 20:22.
I believe that pipercross sell (or at least it comes with some of the vauxhall kits) an adapter plate to allow a conical air filter to fit the square opening on the MAF
Last edited by Matheus428; 27-01-2005 at 20:24.
No room to keep the standard airbox in there?
I get it in automotive store here! HEHE NICE!!
the air flow metre works by judging how much air the engine is sucking in, i.e negative pressure. if you fit a turbo and apply positive pressure (above atmospheric) it will not be able to judge the correct airflow and will underfuel immensely.
The air flow meter is placed on the input to the turbo isn't it? i.e where the air flows, not on the positive pressure side. A MAP sensor needs to be used there, or as Matheus is doing, using a presure switch.
Indeed, air flow meters are pre turbo.
matheus has a gate type jetronic setup, at wide open throttle on the n/a setup the gate is almost fully open, with a turbo sucking through it wheres the extra sensing gonna come from, the gate can only open so far.
Thats what the pressure switch was for I thought? When he has boost, ECU= full fueling, plus his extra injector, which he will set to run OK at full power. Thus it will overfuel, but should work.
which pressure switch ? if your talking theoretical, as in thats what he will have to fit, then fine, thats what im getting at, hows it gonna work.
Yeah, in another thread he said he was going to use a pressure switch to enable the fifth injector to full under boost.
Last edited by Matheus428; 27-01-2005 at 20:25.
Just reading this, I thought it was L-Jetronic not LE-Jetronic (Nova GTE) fitted to Astras then L-Motronic on later ones. Early Astras still used throw weights in the distibutor and vacuum hose. AFMs don't like turbos being added as they can't measure the flow properly. When the AFM is fully open more air is not measured so it runs lean. This is why they went over to the Air mass meter. Your then restricted by it's diameter. Much better fitting a whole turbo engine and loom if you can....
The "D" in Vaux-MD, "X" It's where you bury your money
noe, you had LE jetronic back in the dark ages, then next came L3 jetronic, then motronic varaiations, and multec.
Last edited by Matheus428; 27-01-2005 at 20:26.
DUMB QUESTION ALERT......
does the LET use a afm or map sensor to read intake pressure,if so can it be adapted to work on the above application.
or will the non turbo ecu be unable to increase fueling to the level required ???
Last edited by Matheus428; 27-01-2005 at 20:28.
uses air flow metre. non turbo ecu would be unable to connect to the air flow metre in matheus instance.
i assume thats because the ecu reads different values or something like that , looks like mappable ignition is the best starting point for major mods , i know rising rate regulators can and are used but how accurate are they??
well its because the LET uses a completely different ecu and airflow metre than matheus older 2.0 8v
sorry yeah i realise that , i was just checking if the afm metres were interchangable , obviously both ecu's will be set up different but , they are basically there to ajust fueling etc according to infomation sent via various sensors ie afm , and although the non turbo afm is negative pressure reading and im assuming the turbo is positive pressure reading , but fundamentally all they do is send a signal to the ecu so it ajusts fueling up or down.
now if a positive pressure afm could rigged upto the standard non turbo ecu and calibrated some how (getting theoretical now) so that it sends a signal to the ecu in values it can read , than the only prob is the tolerances of the standard ecu and how much it can adjust fueling!!!
am i talking ar se ..............................i think so
oh and thanks for containing the laughter long enough to answer my questions , i realise they are a bit stupid.
but if you dont ask you dont know
well, the LET uses negative pressure the same as n/a gm engines, but you can appreciate the amount of air passing the turbo afm is gonna be a million times more