Flow Force injector help
#21
Cpt. Slow
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I autotune idle actually, well, usually I can. I get it to ~14s then auto tune to my afr target. Usually works. With these injectors it doesn't. I have min rpm set to 1500 and min fuel load set to 40. Idle cells look a lot like Deezums, a block of 56s, then 57, then 59, then finally at 1500 I'm allowed to do whatever I want.
I'll enter in Aiden's dead time table and hit the dyno later today. I'm thinking I want my required fuel to be correct though, so I'll multiply my fuel table by 2 and make all rpms under ~80kpa equal.
I'll enter in Aiden's dead time table and hit the dyno later today. I'm thinking I want my required fuel to be correct though, so I'll multiply my fuel table by 2 and make all rpms under ~80kpa equal.
#23
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I autotune idle actually, well, usually I can. I get it to ~14s then auto tune to my afr target. Usually works. With these injectors it doesn't. I have min rpm set to 1500 and min fuel load set to 40. Idle cells look a lot like Deezums, a block of 56s, then 57, then 59, then finally at 1500 I'm allowed to do whatever I want.
I'll enter in Aiden's dead time table and hit the dyno later today. I'm thinking I want my required fuel to be correct though, so I'll multiply my fuel table by 2 and make all rpms under ~80kpa equal.
I'll enter in Aiden's dead time table and hit the dyno later today. I'm thinking I want my required fuel to be correct though, so I'll multiply my fuel table by 2 and make all rpms under ~80kpa equal.
Your sig is outdated btw.
#24
Cpt. Slow
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Finally nailed my idle. Kris at KO Racing (highly recommended) helped. We started by increasing load to maximum except AC (cause that changes idle). So lights on bright, blower on full, etc. Adjusted the fuel table for 14.0AFR then turned on EGO correction. 60 ignition events per step, 1% step size, 10% authority. We also turned idle advance off, but idle RPM timing correction on. This allowed us to use the "Idle RPM timing correction curve", and set it to +10 for anything more than -100 rpms from target, and -15 for anything above +100 rpms from target. The ignition advance gauge moves a LOT like this, but idle is rock solid. Base timing is 25* at 950rpm.
I haven't started using closed loop initial values, I'm going to look at a few idle conditions before I enter in values for my best guess, then start generating my table.
Something is definitely up with off throttle conditions. When I let off, despite MASSIVE map based accel enrichments, and fuel cut shut off, and the fuel table being pig rich at low load/low rpm, it spikes to full lean right around idle, unless I give it massive dashpot adder. Currently I'm at 13.3%. It keeps it from dying, but it still has a lean spot and still dips a few hundred RPM lower than I'd prefer.
I haven't started using closed loop initial values, I'm going to look at a few idle conditions before I enter in values for my best guess, then start generating my table.
Something is definitely up with off throttle conditions. When I let off, despite MASSIVE map based accel enrichments, and fuel cut shut off, and the fuel table being pig rich at low load/low rpm, it spikes to full lean right around idle, unless I give it massive dashpot adder. Currently I'm at 13.3%. It keeps it from dying, but it still has a lean spot and still dips a few hundred RPM lower than I'd prefer.
#25
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Something is definitely up with off throttle conditions. When I let off, despite MASSIVE map based accel enrichments, and fuel cut shut off, and the fuel table being pig rich at low load/low rpm, it spikes to full lean right around idle, unless I give it massive dashpot adder. Currently I'm at 13.3%. It keeps it from dying, but it still has a lean spot and still dips a few hundred RPM lower than I'd prefer.
#28
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Look at the pulsewidths during the lean spikes first. If they also drop to zero then its a tune issue. If you still have high PW and afrs go lean then it might be an injector issue.
Because if you have high PW and lean AFR then the ECU is trying to inject and the injectors aren't listening. If PW go down then the tune is telling it to lean out.
Because if you have high PW and lean AFR then the ECU is trying to inject and the injectors aren't listening. If PW go down then the tune is telling it to lean out.
#29
Interesting. I've been having a similar issue with my GT500 FF injectors.
Off-throttle car acts like it has fuel-cut enabled when it 100% doesn't. My MS drops pulse-widths from ~1.7ms to 1.2ms as soon as TP dips below 1% and goes full lean. I have to have ridiculously pig rich over-run row to thwart this odd behavior.
My fuel map has idle VE around 56-58 very similar to other posted above, and idles higher than 3500-5500k cruise VE's.
Interested to see what people do to compensate for bizzare off-throttle issue.
Off-throttle car acts like it has fuel-cut enabled when it 100% doesn't. My MS drops pulse-widths from ~1.7ms to 1.2ms as soon as TP dips below 1% and goes full lean. I have to have ridiculously pig rich over-run row to thwart this odd behavior.
My fuel map has idle VE around 56-58 very similar to other posted above, and idles higher than 3500-5500k cruise VE's.
Interested to see what people do to compensate for bizzare off-throttle issue.
#31
Dunno. My previous EV1 stockers as well as EV6 RX8 injectors worked fine whilst under vacuum. On same Megasquirt as well. Just weird that MS dumps the pulsewidth so low off-throttle. Didn't remember changing anything besides required fuel, dead-times, as well as obvious VE changes when changing from RX8s to these.
#32
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Interesting. I've been having a similar issue with my GT500 FF injectors.
Off-throttle car acts like it has fuel-cut enabled when it 100% doesn't. My MS drops pulse-widths from ~1.7ms to 1.2ms as soon as TP dips below 1% and goes full lean. I have to have ridiculously pig rich over-run row to thwart this odd behavior.
My fuel map has idle VE around 56-58 very similar to other posted above, and idles higher than 3500-5500k cruise VE's.
Interested to see what people do to compensate for bizzare off-throttle issue.
Off-throttle car acts like it has fuel-cut enabled when it 100% doesn't. My MS drops pulse-widths from ~1.7ms to 1.2ms as soon as TP dips below 1% and goes full lean. I have to have ridiculously pig rich over-run row to thwart this odd behavior.
My fuel map has idle VE around 56-58 very similar to other posted above, and idles higher than 3500-5500k cruise VE's.
Interested to see what people do to compensate for bizzare off-throttle issue.
I did some testing at different pulse widths to build a linearity model. The equipment I was using. Wasn't precise enough to get an great linearity model, but it was clear that under 1.7ms at 12V there was basically nothing. At 13.2V it should be good for a bit lower than 1.7, but not much.
Similar to some of you guys, I went fully auto tune to get a decent tune. I just took my base map, multiplied the whole thing by 0.5 and then auto tuned for a couple hours. Idle I just guess and tested until it was on 14.7.
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#33
Aidan, what PW you idle at for 15.0 on 91 or whatever? This might explain why you die on low RPM CL idle issues.
For me on e85, 2.0ms=14.7 idle. 30% less is 1.4ms which is scary close to not being able to idle on regular gasoline. https://www.miataturbo.net/build-thr...4/#post1262925
When I was running 91 I'd idle 14.7afr ~1.7ms pulse which I could tell were getting a bit non-linear.
For me on e85, 2.0ms=14.7 idle. 30% less is 1.4ms which is scary close to not being able to idle on regular gasoline. https://www.miataturbo.net/build-thr...4/#post1262925
When I was running 91 I'd idle 14.7afr ~1.7ms pulse which I could tell were getting a bit non-linear.
#38
If I recall correctly I'm idling at high 1.4ms for 14.6 afr idles. Required fuel at 5.5, VE at 56-58 or so on the table. Vacuum referenced Fuelab FPR (43psi at atmosphere, so like 36psi at idle vacuum). Built 1.8l.
If these things pretty much shut off at 1.4ms that could explain my really really touchy idle.
How Can I get the pulsewidth up without lowering fuel pressure (already low) or running pig rich? Am I missing something real retarded?
If these things pretty much shut off at 1.4ms that could explain my really really touchy idle.
How Can I get the pulsewidth up without lowering fuel pressure (already low) or running pig rich? Am I missing something real retarded?