Megasquirt ms2 13b wont rev past 2800rpm
02-09-13, 12:26 PM
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ms2 13b wont rev past 2800rpm
My car is all f up. Lil background. 13b gal-se motor. S5 intake and stock cas. Ms2 v3. Zeal card. Ls2 coils. Ms extra v 321
Settings as follows.
Capture rising edge
Wasted spark
Going high
D14 spark a
Dual wheel
24tooth
Second ignition rising edge
Tooth angle 0
Cam speed
Every rotation of crank
Rotary on
Fd mode
Rx8 enabled
Neg split not allowed
Cas was stabbed and timed according to my setting. Leading 1 set to yellow timing mark -5 deg. If I stand on the throttle it revs to 2800 rpm and it falls on its face and does not rev higher. Sounds like it has anti lag 2 step. Afr on the rich side. Keep in mind car was running a couple mo ago perfectly fine.
Settings as follows.
Capture rising edge
Wasted spark
Going high
D14 spark a
Dual wheel
24tooth
Second ignition rising edge
Tooth angle 0
Cam speed
Every rotation of crank
Rotary on
Fd mode
Rx8 enabled
Neg split not allowed
Cas was stabbed and timed according to my setting. Leading 1 set to yellow timing mark -5 deg. If I stand on the throttle it revs to 2800 rpm and it falls on its face and does not rev higher. Sounds like it has anti lag 2 step. Afr on the rich side. Keep in mind car was running a couple mo ago perfectly fine.
02-10-13, 10:20 AM
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In a situation like this you can't rely on a wideband.
For example, how rich is it reading?
Does it always stop at 2800 RPM? At any throttle level?
What are your staging settings? Maybe post the MSQ?
For example, how rich is it reading?
Does it always stop at 2800 RPM? At any throttle level?
What are your staging settings? Maybe post the MSQ?
02-10-13, 01:17 PM
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I re cal my wideband for what its worth. Afr about 10-11:1. Smells extremely rich too. Between the 2800-3000 rpm range. I cand slowly roll the throttle to wide open and it revs smooth until that rpm range and just sputters and runs horrible.
Staged injection on
Primary 460 cc
Secondary 720cc
Rpm. Trigger
Limit 3500 rpm
Staging events 60
Hysterisis 30
My good laptop got stolen when my house was robbed last month. I'm using a pos laptop. I'll try and pull a msq and datalog today. This pos comp makes it hard. Think I'm going to try and swap my tps today.
Staged injection on
Primary 460 cc
Secondary 720cc
Rpm. Trigger
Limit 3500 rpm
Staging events 60
Hysterisis 30
My good laptop got stolen when my house was robbed last month. I'm using a pos laptop. I'll try and pull a msq and datalog today. This pos comp makes it hard. Think I'm going to try and swap my tps today.
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02-10-13, 03:15 PM
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ok took a couple quick data logs and got my msq off the laptop. took restarting it 4 times in the process.
ok got attached logs and msq thank you
ok got attached logs and msq thank you
Last edited by wankelbug; 02-10-13 at 03:30 PM. Reason: added logs
02-11-13, 09:02 AM
#10
Engine, Not Motor
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10-11:1 is extremely rich for an NA. Hell, it's even rich for most turbo cars depending on boost level. There's your problem.
Check for mechanical causes first. It sounds like you have a failing injector. You may be able to tell which rotor has the bad injector by pulling the spark plugs and finding the ones wet with fuel.
Checking through your MSQ...
You do have a large fuel increase at 3000 RPM. Larger than I would expect for an NA especially with that much injector (if the MSQ settings of 460/720 are to be believed).
You are also only staging using RPM as the reference. That's going to cause some fairly major issues tuning and I'd actually expect your VE table to make a huge dip after 3500 RPM, not the big mountain which is there now. You need to set up a 2nd staging parameter, MAP, and set it for about 90 KPA. Your AFR table is also whacked.
Basically your car is behaving as I would expect after examining your tune.
Check for mechanical causes first. It sounds like you have a failing injector. You may be able to tell which rotor has the bad injector by pulling the spark plugs and finding the ones wet with fuel.
Checking through your MSQ...
You do have a large fuel increase at 3000 RPM. Larger than I would expect for an NA especially with that much injector (if the MSQ settings of 460/720 are to be believed).
You are also only staging using RPM as the reference. That's going to cause some fairly major issues tuning and I'd actually expect your VE table to make a huge dip after 3500 RPM, not the big mountain which is there now. You need to set up a 2nd staging parameter, MAP, and set it for about 90 KPA. Your AFR table is also whacked.
Basically your car is behaving as I would expect after examining your tune.
02-13-13, 06:38 PM
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finally got a chance to get out in the garage. i loaded your AFR table aaroncake from your website. worked on the fuel map but its still rich. does anyone have a decent base map for a 13b 6 port stock ports? i would be willing to pay pal you a few bucks for one since i need to get this car running to sell it asap.
02-15-13, 09:14 PM
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It's fixed. I went through everything. Found out with going high coils you run it rx8 mode but I switched it to going low and it woke up. I guess rx8 mode inverts the signal for you?
02-16-13, 10:39 AM
#17
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You'll find some base settings for the accel pumps in my Megasquirt writeup. But like the VE tables, they are just base settings which work reasonably well. It will all have to be tuned to your engine.
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