this is telling me that rising rate fuel pressure regulators on boosted applications to "compensate for increased manifold pressure" is sort of detrimental...
I would like to see you do a dead time test on a low res 2.2 Ohm siemens 72lb injector at 43.5psi then I can program that in my megasquirt 2 for best fuel control.
I'd be curious to see the setup for this test. I can pay someone to test dead time, but I'd like to do it myself if it can be done accurately. I need to measure latency based on voltage instead of pressure, but the test would be the same unless I'm missing something.
great test... so increasing fuel pressure we always flow less? what if you only increase a little more like most fuel boost reference pressure regulators do?
Typically if pressure increases, an injector delivers more fuel (within reason). When Mr. Taylor told me he sprayed carb cleaner into the throttle and it ran better I thought about injector dead time and cooked up my experiment with the scope and injector bench.Two things caused the decrease here, the large increase in pressure and the large injector size. I ran this past a development engineer who said the same thing.
The scope voltage trace lead goes to the injector ground wire and the scope current trace uses a mili-amp inductive probe clamped around either one of the injector wires.
Latency is the fine tune valve that matches your ecm thinking and the actual output of fuel the same. Your ecm just turns fuel on and off, the latency is what scaled your ecm so the injectors are flowing the flow rate you told it to. Higher fuel pressure means smaller latency values to achieve the same flow
That's literally not the case at all and was clearly demonstrated if you watched the entire video. Also, this is why when you buy Injectors from a reputable company like FIC, you get different latency values for different fuel pressures, all of which increase as the fuel pressure increases. :)
If you're not a teacher, you've missed your calling. Thanks for the great info, proper troubleshooting is hard to find.
دمت گرم . جدا زیبا بود . توضیحاتت کامل بود
Amazing, thank you very much!
You are GOD DAMN GENIUS-GREAT VIDEO!
My car also went lean at idle when I replace the fuel pump , everything make sense now thankyou.
Really nice simulation with injectors and Oscope. Thanks!
Thank you,
this is telling me that rising rate fuel pressure regulators on boosted applications to "compensate for increased manifold pressure" is sort of detrimental...
I would like to see you do a dead time test on a low res 2.2 Ohm siemens 72lb injector at 43.5psi then I can program that in my megasquirt 2 for best fuel control.
I'd be curious to see the setup for this test. I can pay someone to test dead time, but I'd like to do it myself if it can be done accurately. I need to measure latency based on voltage instead of pressure, but the test would be the same unless I'm missing something.
The increase in pressure did not optimally allow the injectors to operate because they needed to exercise more force to open.
great test... so increasing fuel pressure we always flow less? what if you only increase a little more like most fuel boost reference pressure regulators do?
Typically if pressure increases, an injector delivers more fuel (within reason). When Mr. Taylor told me he sprayed carb cleaner into the throttle and it ran better I thought about injector dead time and cooked up my experiment with the scope and injector bench.Two things caused the decrease here, the large increase in pressure and the large injector size. I ran this past a development engineer who said the same thing.
PICO.... tHE ONLY WAY TO GO
how do you wire the scope to the injector to get the readings?
The scope voltage trace lead goes to the injector ground wire and the scope current trace uses a mili-amp inductive probe clamped around either one of the injector wires.
What type of PC scope are you using?
Latency is the fine tune valve that matches your ecm thinking and the actual output of fuel the same. Your ecm just turns fuel on and off, the latency is what scaled your ecm so the injectors are flowing the flow rate you told it to.
Higher fuel pressure means smaller latency values to achieve the same flow
That's literally not the case at all and was clearly demonstrated if you watched the entire video.
Also, this is why when you buy Injectors from a reputable company like FIC, you get different latency values for different fuel pressures, all of which increase as the fuel pressure increases. :)
You you have to tell the computer how long it takes for the injector to open and inject the scaler amount. It directly effects the entire tune.
Wģ