How much can backpressure effect hp and turbo spooling?
#84
if the system is looging at 10 hz there will be random values within a range. at 100 hz it will not be very different i guess, but dont know. if you have an undamped map signal, you will see the same.
#85
summarising (have not reread, thread is getting long):
- nothing weird with the 27 psi pull
- you see an exhaus/boost pressure ratio of 1.3 at 27 psi. nothing wrong.
- you say the ratio is higher at 18 psi. while i would not have assumed that would happen with the same turbo, nothing weird either, your compressor/turbine combination just likes that region better. its good and not bad.
- you say the 27 psi pull did not produce more power. now, to make any judgement on that, we would have to see a logg. but assuming the injector on time and fuel flow (whatever your measuring there) has increased according to boost and the mixture didnt change, its hard to understand.
im not sure how you measured hp. you say you took it to the track, you also mention a dyno. how exactly did you determine the power level?
btw, no idea how the co2 controll of the gates work. would you care to explain?
- nothing weird with the 27 psi pull
- you see an exhaus/boost pressure ratio of 1.3 at 27 psi. nothing wrong.
- you say the ratio is higher at 18 psi. while i would not have assumed that would happen with the same turbo, nothing weird either, your compressor/turbine combination just likes that region better. its good and not bad.
- you say the 27 psi pull did not produce more power. now, to make any judgement on that, we would have to see a logg. but assuming the injector on time and fuel flow (whatever your measuring there) has increased according to boost and the mixture didnt change, its hard to understand.
im not sure how you measured hp. you say you took it to the track, you also mention a dyno. how exactly did you determine the power level?
btw, no idea how the co2 controll of the gates work. would you care to explain?
#87
#88
Agree with logging pre-post intercooler boost and temp. I don't have 3 boost gauges for fun.... 2 under hood for diag and dyno purposes and 1 on steering column for driving. 1st on compressor housing, 2nd on cold side immediately after IC core, 3rd in intake manifold post-TB. Once you confirm pressure drop of IC core the diagnostic ports can be plugged until you need to use them again.
I'm betting this is a mechanical issue. Never been a fan of CO2 controlled systems but haven't gone so crazy to need it yet, what can be done to confirm its working as intended?
I'm betting this is a mechanical issue. Never been a fan of CO2 controlled systems but haven't gone so crazy to need it yet, what can be done to confirm its working as intended?
#90
MAP Based Dwell
Hi, thanks for the Dwell report.
The 5.2 ms should work fine with 65% of rated coil output available.
The V-4 has a MAP DWELL object.
You could add a MAP (BOOST) dwell increase of 1.5 MS @ 27 psi.
My method for EMAP measurement IS to dampen the report BY use of a Weber Idle JET in the line to the sensor, near the sensor, of a .45 size.
Does your crankshaft have the 58x TW ?
You could "log" the Crankshaft Acceleration with FIVE tooth reads, interval reads, within the 30 degree peak combustion window.
This method will allow a combustion quality report for each cylinder at 6 K RPM AND 200 Hz log rate.
Lance
The 5.2 ms should work fine with 65% of rated coil output available.
The V-4 has a MAP DWELL object.
You could add a MAP (BOOST) dwell increase of 1.5 MS @ 27 psi.
My method for EMAP measurement IS to dampen the report BY use of a Weber Idle JET in the line to the sensor, near the sensor, of a .45 size.
Does your crankshaft have the 58x TW ?
You could "log" the Crankshaft Acceleration with FIVE tooth reads, interval reads, within the 30 degree peak combustion window.
This method will allow a combustion quality report for each cylinder at 6 K RPM AND 200 Hz log rate.
Lance
#95
I love when the people that have similar setups come together and solve issues, both for the fun, enjoyment aspects and to provide much needed tech support to non-business end users that share the hobby. I hope one day to have such luck.
as to the pressure sensor, it moves up and down ~10psi. That is quite a substantial difference, and in my opinion is somewhat useless the way it is. I understand that it reads that way for "some reason"- I am not saying it is broken or not working correctly, I am only saying that the way it currently displays data is partially useless, I would want to know how to read the sensor properly or how to dampen it, as has been suggested. In other words, is it 35psi? Is it 25psi? Do we take the mean of the reading at 30psi? How can we tell what the pressure really is? Nobody has addressed this issue yet.
as to the pressure sensor, it moves up and down ~10psi. That is quite a substantial difference, and in my opinion is somewhat useless the way it is. I understand that it reads that way for "some reason"- I am not saying it is broken or not working correctly, I am only saying that the way it currently displays data is partially useless, I would want to know how to read the sensor properly or how to dampen it, as has been suggested. In other words, is it 35psi? Is it 25psi? Do we take the mean of the reading at 30psi? How can we tell what the pressure really is? Nobody has addressed this issue yet.
#96
Weber Idle Jet = Orifice
Hi King, I am that "Nobody", your "speak".
I could make a better explanation : The use of a R/C circuit for an Air Filter.
Use the Weber Idle Jet as stated (the R), then add a small canister (the C) to the circuit.
The fitment is "inline", first the Idle Jet, then into the Canister, then into the sensor.
The size (volume) of the "C" will effect the Dampening.
Lance
I could make a better explanation : The use of a R/C circuit for an Air Filter.
Use the Weber Idle Jet as stated (the R), then add a small canister (the C) to the circuit.
The fitment is "inline", first the Idle Jet, then into the Canister, then into the sensor.
The size (volume) of the "C" will effect the Dampening.
Lance
#99
Hi King, I am that "Nobody", your "speak".
I could make a better explanation : The use of a R/C circuit for an Air Filter.
Use the Weber Idle Jet as stated (the R), then add a small canister (the C) to the circuit.
The fitment is "inline", first the Idle Jet, then into the Canister, then into the sensor.
The size (volume) of the "C" will effect the Dampening.
Lance
I could make a better explanation : The use of a R/C circuit for an Air Filter.
Use the Weber Idle Jet as stated (the R), then add a small canister (the C) to the circuit.
The fitment is "inline", first the Idle Jet, then into the Canister, then into the sensor.
The size (volume) of the "C" will effect the Dampening.
Lance
its weird the software doesnt have some smothing feature, though.
#100
That said, even when electronic filtering is available...plain and simple mechanical filtering often still does a better job.
Whether a carb jet, nitrous jet or MIG 0.6 or 0.8mm tip
They just do a good job of it, and it can also help the sensor survive longer too.