OCTOBOX Posted April 26, 2020 Share Posted April 26, 2020 Hi all i am new to this forum business so please bare with me. I have a 3.5 efi and can’t for the life of me work out how the ecu knows wich injector to open. I know it picks up a pulse off the coil that comes from a halleffect sensor on the dizzy. But all the ecu recives is 8 identical pulses? How does it know to squirt on say cylinder 7 and not on say cylinder 2 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 26, 2020 Share Posted April 26, 2020 Flapper EFI is not sequential, nor is hotwire.... It has little benefit in the real world. Quote Link to comment Share on other sites More sharing options...
OCTOBOX Posted April 26, 2020 Author Share Posted April 26, 2020 Hi bowie69 so you are saying it just squirtes fuel at any of the 8 ports regardless of wether the inlet valve is open or closed. Then when the inlet valve opens the incoming air will drag the puddle of fuel through haha 😂. That has to be the crapest system i have ever heard no wonder they don’t just fire up on the first kick. Thanks for the reply🙂 Quote Link to comment Share on other sites More sharing options...
lo-fi Posted April 27, 2020 Share Posted April 27, 2020 It's how most fuel injection up to the very modem stuff works. There's vanishingly little advantage to sequential injection, as Bowie says above, for the simple reason that at anything more than very moderate loads the injectors are open significantly more time than the inlet valves. There are many things to complain about in Land Rover fuel injection systems, but batch fire injection is very low on the list. 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 27, 2020 Share Posted April 27, 2020 Yup, as above, it sounds terrible, but has worked for all efi for decades until , say, the mid 2000s where sequential started becoming more mainstream. Quote Link to comment Share on other sites More sharing options...
OCTOBOX Posted April 27, 2020 Author Share Posted April 27, 2020 Fair play i guess it makes sence to of preloaded the fuel instead of trying to jet it all through in such a small time frame. It kinda makes me think spray pattern shouldn’t be so crucial if it hasn’t got spray Perfectly around the valve just dump the right amount in and then suck it through right? But then i guess a neat spray is the correct amount and anything other than neat is less fuel? Cheers for the info guys its much appreciated! Quote Link to comment Share on other sites More sharing options...
lo-fi Posted April 27, 2020 Share Posted April 27, 2020 57 minutes ago, OCTOBOX said: dump the right amount in and then suck it through right? Pretty much this. The pressure fluctuation as the flow in the intake runner stops and starts helps with atomisation. The angle the injectors sit at in relation to the ports is kinda important, but not super critical unless you're trying to squeeze every last drop of euro rating out of your fuel, as is flow pattern. Quote Link to comment Share on other sites More sharing options...
OCTOBOX Posted April 27, 2020 Author Share Posted April 27, 2020 So does anyone know if the 4.0 thor engine is sequential of not? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 27, 2020 Share Posted April 27, 2020 Why do you care? Sequential has almost no benefit apart from emissions at idle, and firing at the back of a closed valve is actually beneficial, it cools the valve / charge, vaporises the fuel and allows it to swirl. 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 27, 2020 Share Posted April 27, 2020 They didn't not do it because it wasn't good enough -quite the opposite, it *IS* good enough. Quote Link to comment Share on other sites More sharing options...
elbekko Posted April 27, 2020 Share Posted April 27, 2020 4 hours ago, OCTOBOX said: So does anyone know if the 4.0 thor engine is sequential of not? It is. 1 Quote Link to comment Share on other sites More sharing options...
OCTOBOX Posted April 27, 2020 Author Share Posted April 27, 2020 6 hours ago, FridgeFreezer said: Why do you care? Sequential has almost no benefit apart from emissions at idle, and firing at the back of a closed valve is actually beneficial, it cools the valve / charge, vaporises the fuel and allows it to swirl. I care because i like to know how things work and what i am dealing with. Hence joining this forum and asking questions. Although I appreciate the info. Quote Link to comment Share on other sites More sharing options...
smallfry Posted April 28, 2020 Share Posted April 28, 2020 23 hours ago, OCTOBOX said: So does anyone know if the 4.0 thor engine is sequential of not? It is. Apparently. But is produces no more power or economy than a Hotwire 3.9 Does produce slightly more torque though, but that more by virtue of the inlet manifold. Quote Link to comment Share on other sites More sharing options...
Escape Posted April 30, 2020 Share Posted April 30, 2020 The higher torque at lower revs is indeed due to the longer intake runners. At the cost of a very little bit of top end power. The Bosch sequential injection was for emission purposes, to comply with Euro3 and similar. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.