You can get less pressure. If I go full throttle at a 20psi boost setting my 6758 makes 20psi of boost. 50% throttle makes like 10ish to the manifold?
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It is the skinny pedal that gets you in trouble (or not) not the boost control switch.
and my "pro tip": Run the wastegate pressure that you have and be happy with it until it is tuned perfectly. "Don't blow your shit up" |
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I've been having an issue that just started recently. The car cranks and doesn't start. It'll seem to catch, jump up in revs, then fall flat on its face. It has never done this before. After the 2nd or 3rd try starting it... no issues. Car runs absolutely fine when it gets going. Idles fine, drives fine, AFR's fine. The works. But... crank.... sputtterrrr sputtterrrr.... killll meeee slooowwww rpmmmmm droppppp.....dead.
Stefan had looked things over and said that it looks like it was a fueling issue at startup. Any input? Tune and log attached. I also have some issues with the alternator control where the car tries to die under load and the battery V drops like woah and the alternator duty cycle hits 100. I feel like I don't even have much on in those moments, but.... I'll have to sit in a parking lot and take a log of this once the car is warmed up. Thanks for any input.
Originally Posted by dr_boone
(Post 1416891)
It is the skinny pedal that gets you in trouble (or not) not the boost control switch.
and my "pro tip": Run the wastegate pressure that you have and be happy with it until it is tuned perfectly. "Don't blow your shit up" Given what my schedule is going to be like for the next few months, I'm not really planning on messing with anything that requires an uncertain amount of time to get right. My biggest upcoming project is getting the coolant reroute in. I dropped the car off to have the clutch done earlier today. I wanted to do it myself but that entire time thing... It's definitely going to hurt the parts budget for a bit. There's always ramen! So it goes. |
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I had the same kind of problems with the FlowForce injectors. I found that the engine would run but that fueling was inconsistent and I'd have weird idle problems until I (actually Curly) dialed in the dead times. Suspecting you had the same problem, I checked your tune and see that your settings are different than those on the Instructions ? Flow Force Injectors website.
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I went back and forth with Brain et al on this and the conclusion was that the base size is what it is and the adjustments are made after the fact. It's a 640CC injector, but it has higher fuel pressure than what it's rated at so it can push 739CC, but it's still a 640CC injector. So I'm not sure what to make of that.
I thought I got my dead times from one of nigel's old posts so I'm a bit confused as to how I got it wrong. Thanks, I'll double check my settings. However, this issue is weird to me for a few reasons, the biggest of which is that this is a new issue. The car has been running absolutely fine till now with these injectors. Including with the turbo setup. I don't even think the temperature swings have been all that drastic since I drove it a fair amount when it was warm out a month ago. It does it when it's cool out too. I don't think I have inconsistent fueling so much as that there's something in the startup/cranking settings that seems to have changed (?) or seems to not be dialed in anymore. This seems to only be a startup/cranking problem. Edit: Look at the first 10 seconds of the log. That same thing happened this morning twice. Then it started up on the third go around. |
I can't comment on what might have changed since I'm a total noob compared to most on here. I simply wanted to share what fixed some of the same problems on my car in the hope it could help. The incorrect dead time settings created the most problems for me at startup and idle. I remember Curly telling me that dead times need to be totally correct under those conditions because that's when precise fueling is most important.
FWIW, I went through several iterations on the dead time settings with the Flow Force injectors, including working directly with Nigel. He sent out a set for additional testing and found they behaved differently than he first thought. This additional testing also resulted in the small pulsewidth settings. Nigel told me before that the numbers on his website are the latest and greatest. Just my 2 cents... |
My injectors are also not 'technically' flow forces. I bought a set of 8 mustang take offs and bought Nigel's adapter kit. He had commented a few years ago saying that all of his testing had shown an incredibly small amount of variation and that he was confident that picking a random batch of 4 injectors would yield something that would be within 3-5% of one another.
If I had to do it over again, I may have just bought everything from him. But... you know.... |
Required fuel doesn't matter. If you change it now you will need to adjust your fuel table. It's just a multiplier.
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Thanks for the clarification, Aidan. Still learning here. I was poking around the forum and found a thread about measuring dead times on a car instead of relying on published numbers. Perhaps that would be helpful in this case. https://www.miataturbo.net/ecus-tuni...ad-time-56061/ As a bonus, that thread helped me finally understand why my unboosted AFRs go lean and boosted AFRs go rich when the engine gets heat soaked. I've long suspected the issue was in the injectors and a few threads suggested that as well. Trying to fix that behavior led to all the work on dead times. Now I understand it's just the way things work. Very happy to know that. Figure I'll need to set VE in the middle and let EGO handle the changes. |
Thanks for the clarification, Aidan. Still learning here. I was poking around the forum and found a thread about measuring dead times on a car instead of relying on published numbers. Perhaps that would be helpful in this case. https://www.miataturbo.net/ecus-tuni...ad-time-56061/ As a bonus, that thread helped me finally understand why my unboosted AFRs go lean and boosted AFRs go rich when the engine gets heat soaked. I've long suspected the issue was in the injectors and a few threads suggested that as well. Trying to fix that behavior led to all the work on dead times. Now I understand it's just the way things work. Very happy to know that. Figure I'll need to set VE in the middle and let EGO handle the changes. |
Out of curiosity, what are the symptoms of a cranky fuel pump?
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Shitty fuel pressure.
Oddly I never had heat soak issues with my mustang injectors. Id1000s have it real bad. It's only at low pw though. So I just run ego correction down low. I would shy away from letting ego correction take care of it in boost. In my experience it's the low pulse width where the issue shows up. So even if you do a hot restart, then do a full boost pull you will hit your targets in boost. Even if your idle is lean |
@Nigel & @aidandj
Where does MS apply the Small Pulsewidth Correction, before or after Dead Time is added in the fueling equation? I would think it would have to be after, based on the size of the values. Also, Aidan is correct, injector coil temps affect actual injector Dead time, so only affects low pulse widths in any meaningful amount. |
Originally Posted by aceswerling
(Post 1419451)
Blah blah blah, RTC your numbers for injector settings might be off, blah blah blah. Thanks! |
Originally Posted by DNMakinson
(Post 1419519)
@Nigel & @aidandj
Where does MS apply the Small Pulsewidth Correction, before or after Dead Time is added in the fueling equation? I would think it would have to be after, based on the size of the values. Also, Aidan is correct, injector coil temps affect actual injector Dead time, so only affects low pulse widths in any meaningful amount. Also wondering if anyone has spent some time playing with engine state settings and has a good way to get things to work. Aidan had a good suggestion for doing things earlier in the thread and I was wondering if there was anything else to add to it. https://www.miataturbo.net/megasquir...5/#post1406629 |
Originally Posted by ridethecliche
(Post 1494710)
I'm going to bump this thread in the hope that this gets answered.
Also wondering if anyone has spent some time playing with engine state settings and has a good way to get things to work. Aidan had a good suggestion for doing things earlier in the thread and I was wondering if there was anything else to add to it. https://www.miataturbo.net/megasquir...5/#post1406629 I'm a fan of 1.4.0 or 1.4.1. |
Not sure what issues, if any, I'd run into downgrading firmware. I got the tune working pretty well on my old motor, but the engine states didn't carry over to the new motor obviously.
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