max boost exceeded after fitting R Intercoolers to LC
- Thread starter Phillc
- Start date
what andy said.
are r and lc map sensors identical? is the ecu getting the same info as before?
forge and pro alloy both used my original sensors iirc
id try original sensors before anything else
are r and lc map sensors identical? is the ecu getting the same info as before?
forge and pro alloy both used my original sensors iirc
id try original sensors before anything else
I'm practically positive. It would be worth trying the old sensor (as long as it's not a 16mm one), but as Dave said, if the MAP was overreading, the boost gauge would show a lower figure.
from the sensors point of view its expecting ko4 power. its now getting lower ko3s power. so wouldnt it read low boost? ....give me more type thing?
from the ecus point of view the boost is now lower as its further to get around... so it increases boost?
falls a bit flat looking at actual vrs requested though. but if the ecus getting very different info who knows how it might play up.
in the new system id guess it needs higher boost to maintain the power in the extra pipe work?
can you tell im guessing?
Thanks for all your input, the n75 was removed from the tip when the work was done but the hose that goes from it into the charge pipe was not, so i could'nt have conected it the wrong way round,if it was faulty would it show up on vagcom? what are the implications of it running lean and what would the cause likley to be? the part numbers for the map sensor are the same.
Nah, it's not the map sensor - you can see from the logs that it's doing it's job. The readings aren't even going to 2540 like with mapped spikes. Look to an acuator that isn't opening the wastegate - N75 not functioning properly - because it's piped wrongly etc..
Yes (the guessing bit). Boost is pressure, not flow (which is volume). The only thing that will happen is (if) there is more pipework and intercoolers to fill is that it'll take longer to pump the air up to the required boost pressure.
The major view of boost that the ECU has is the MAP sensor (it will estimate it from MAF and IAT to cross check), if the MAP was underreading, the ECU wouldn't see the extra boost, as it's using the MAP sensor...
Think what would happen when someone fitted an FMIC...
Ok, just been out and looked the pipe coming from the N75 to the charge pipe had split and come off, is this the answer.
i think my confusion is that im thinking the map is measuring the pipe pressure(in relation to the effect of boost)
but i think its actually measuring air pressure ... the stuff they talk about on weather forecasts?
Thanks again i am going to wash the car now as it has stopped raining, hopfully i will get to meet some of you tomorrow.
Cheers again.
Cheers again.
Nope, I think your problem is you're just confused
You mentioned earlier about the MAP sensor reading the "power" of a K04 vs a K03, and therfore wanting to get the k03 to make k04 power.
It doesn't work like that. The MAP sensor measures the absolute pressure in the intake (atmospheric + boost), so it doesn't matter what turbo you're running, it "just" opens and closes the wastegate to try and get the turbo to produce requested boost.
The only thing that would matter would be a restriction between the turbo and the Throttle plate as the turbo would be working like a bitch to produce enough boost to meet requested at the MAP PLUS the pressure drop over the restriction.
Not all MAP sensors are the same though, the output signal varies for example, the famous diesel 3 bar MAP sensor reads higher than the others, but even so the output voltage for a given pressure is, apparently, close enough.
Anyway, it's fixed.
Nope, I think your problem is you're just confused
You mentioned earlier about the MAP sensor reading the "power" of a K04 vs a K03, and therfore wanting to get the k03 to make k04 power.
It doesn't work like that. The MAP sensor measures the absolute pressure in the intake (atmospheric + boost), so it doesn't matter what turbo you're running, it "just" opens and closes the wastegate to try and get the turbo to produce requested boost.
The only thing that would matter would be a restriction between the turbo and the Throttle plate as the turbo would be working like a bitch to produce enough boost to meet requested at the MAP PLUS the pressure drop over the restriction.
Not all MAP sensors are the same though, the output signal varies for example, the famous diesel 3 bar MAP sensor reads higher than the others, but even so the output voltage for a given pressure is, apparently, close enough.
Anyway, it's fixed.
yep... hence the questions. but its a little less muddy now
Well, they say the only daft question is one that isn't asked.
Sorry if I was a bit harsh.
no problem
the 20vt is much more rocket science than janet and john. (at least it is to me) but thanks to many on here such as yourself and the "buddy Dave" my understanding creeps along.Similar threads
