Hello.
It seems I have a slight issue with tach spikes,
I'm running a 2.2 board, with 029r code,
EDIS for spark.
The car is bucking at light load, at crusing speed (3rd gear, 60km/h)
but is fine in heavy loads (4th gear, 60km/h)
I'll be able to get a log tomorrow. as I would like someone to look at my AFR which is mildly erratic, and has just got totally wacked.. (I'm going to do a free air calibration tomorrow to see if there's an inprovement)
Thanks.
EDIS tach Spikes
Moderators: jsmcortina, muythaibxr
EDIS tach Spikes
...Mitch
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
Mitch,
Post a datalog and .msq. That sounds very odd for EDIS, as the module itself does the signal conditioning, and a clean square wave tach signal fire the MS. Is this a new install? Don't worry about the AFR issues, as those issues are likely due to the tach spikes.
Post a datalog and .msq. That sounds very odd for EDIS, as the module itself does the signal conditioning, and a clean square wave tach signal fire the MS. Is this a new install? Don't worry about the AFR issues, as those issues are likely due to the tach spikes.
1979 Mazda RX-7, running MSnSExtra hi-res 09c for fuel and spark control on a turbocharged, intercooled, and (of course!) injected 13B rotary.
I have to agree about the actual AFR.
What does a fried LC-1 output act like??
I have a few logs on my comp in the car,
and a few older ones here.
I'm going to parse through them now.
Thanks..
Edit: No, not a new install, just this problem would've seemed like a tuning quirk in one bin. until I was at idle, and noticed it jump from 850rpm ->1200 then back again.. suddenly.
What does a fried LC-1 output act like??
I have a few logs on my comp in the car,
and a few older ones here.
I'm going to parse through them now.
Thanks..
Edit: No, not a new install, just this problem would've seemed like a tuning quirk in one bin. until I was at idle, and noticed it jump from 850rpm ->1200 then back again.. suddenly.
...Mitch
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
ok
here's a datalog which gives pretty good indication of actual tach spikes, proof that they exist.
One warning..
This was pretty much the highest/hardest time I've ran this car, it's currently not intercooled, and all temps are in *C.. yes i know my MAT reaches 90*... ouch..
intercooler is being installed soon..
Also, later in the run, the AFR stays constant.. i overheated the LC-1 sensor...
Hopefully someone can give me a hint on how to fix this tach spike.
I'm thinking I need to move the sensor closer to the wheel.
The two questions i want addressed:
early in the datalog, there are tach spikes. do anyone know what could cause them?
Also, at time ~1850 there is a huge swing in AFR. I'm experencing major "bucking" when driving, and wonder if it;s the afr swing, or the tach spikes that lead to this (i know it's been discussed previously.. but more talk can help..)
Thanks for your time.
here's a datalog which gives pretty good indication of actual tach spikes, proof that they exist.
One warning..
This was pretty much the highest/hardest time I've ran this car, it's currently not intercooled, and all temps are in *C.. yes i know my MAT reaches 90*... ouch..
intercooler is being installed soon..
Also, later in the run, the AFR stays constant.. i overheated the LC-1 sensor...
Hopefully someone can give me a hint on how to fix this tach spike.
I'm thinking I need to move the sensor closer to the wheel.
The two questions i want addressed:
early in the datalog, there are tach spikes. do anyone know what could cause them?
Also, at time ~1850 there is a huge swing in AFR. I'm experencing major "bucking" when driving, and wonder if it;s the afr swing, or the tach spikes that lead to this (i know it's been discussed previously.. but more talk can help..)
Thanks for your time.
...Mitch
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
Anyone care to give me any pointers?
how far away should the vr sensor be?
My setup was working previously, so I'm unsure what could've happened.
Thanks
how far away should the vr sensor be?
My setup was working previously, so I'm unsure what could've happened.
Thanks
...Mitch
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
Turbo'd Bmw M10 engine, 18psi, stock internals.
Using V3 board, with Ms1, HR code.
4 LS-1 Coils, 36-1 VR setup, and 4G15 (optical) Cas Retrofit for 2nd Trigger.
-
FixItAgainTony
- Helpful MS/Extra'er
- Posts: 64
- Joined: Thu Feb 03, 2005 2:09 pm
Hello Mitch,
I'll plead ignorance first - I have only run EDIS on a test bench...
These guys have done a lot of checking on gap and tooth design - it might be worth looking at:
http://www.msefi.com/viewtopic.php?p=11 ... nch#119509
I noticed in the log file - that all of the spikes were pretty much 2X your actual RPM. Perhaps you are getting some sort of an electrical ring that is registering as a pulse to either Megasquirt or to the EDIS module itself. No idea why this would change, but I would check the Vr connections and shielding, the module ground / power and the PIP connection out to MS. As pointed out, the PIP to MegaSquirt is a pretty clean interface - I'd doubt the problem is there. I would also consider increasing the Vr pick up gap from the wheel slightly. This will reduce the amplitude of the Vr signal and may remove the problem. The guys who worked on the test bench reported that the modules can run okay with a large variation in Vr gap. May or may not help, but it is easy to try. Are the teeth on the EDIS wheel in good shape?
Good luck,
Charles.
I'll plead ignorance first - I have only run EDIS on a test bench...
These guys have done a lot of checking on gap and tooth design - it might be worth looking at:
http://www.msefi.com/viewtopic.php?p=11 ... nch#119509
I noticed in the log file - that all of the spikes were pretty much 2X your actual RPM. Perhaps you are getting some sort of an electrical ring that is registering as a pulse to either Megasquirt or to the EDIS module itself. No idea why this would change, but I would check the Vr connections and shielding, the module ground / power and the PIP connection out to MS. As pointed out, the PIP to MegaSquirt is a pretty clean interface - I'd doubt the problem is there. I would also consider increasing the Vr pick up gap from the wheel slightly. This will reduce the amplitude of the Vr signal and may remove the problem. The guys who worked on the test bench reported that the modules can run okay with a large variation in Vr gap. May or may not help, but it is easy to try. Are the teeth on the EDIS wheel in good shape?
Good luck,
Charles.
Fiat - A great car for those who like to walk.