That is again very helpful Obeisance
I will have time this winter to modify things, or send electronics out.
Cross boarder shopping is difficult, and there are no tuning places near.
RomRaider is interesting, and maybe the best option. If a simple, low boost option does not come knocking.
Some 70’s and 80’s cars have “Cold Start Injectors”. These can be made to turn on without too much. Don’t know if simply open, and a rising rate fuel pressure regulator would add enough. Speculation anyone?
Are larger injectors considered 550+? I suspect most folk who are adding boost, are going big. Race track stuff.
Low RPM injector flow in a 320-350 injector may not be so poorly metered?
Has anyone added one or two injectors, to add extra fuel at boost?
Unfortunately, turbocharging this car is not simple even with low boost. Don't confuse the technology of this car with the cars from the 80's and 90's. Simple low boost with those cars were easy. I had a 91' Miata and did exactly what you are wanting to do and it worked fine. Those cars had a return fuel system, a way to change the ignition timing without needing access to the computer, they were low compression and the engine was simple (no VVT or VVTi-L). The Lotus is the exact opposite of simple. I spent all of $1000 on a Greddy turbo kit, it was non-intercooled, used stock(ish) injectors, a high pressure fuel pump and a rising rate regulator (10:1 ratio). I ran 6psi with that kit but with around 100-110 psi of fuel for proper A/F ratio's.
If you run the math, you will need around 100-105psi of fuel pressure to support "low boost" using stock Elise injectors which I guess could be done if you convert to a return system (there is no reason to do this though unless you are looking to make big power). However, you still need a way to control the ignition timing which can only be done electronically through the ECU. Also, keep in mind in the grand scheme of things, injectors are cheap compared to the rest of the components of the turbo system.
Take a look at my full build log for boosting a 2ZZ. I would recommend you don't skimp on the fuel delivery and ignition control. With Forced Induction it doesn't take much have things go horribly wrong, especially with the stock internals and the high compression. I'm not running huge injectors Siemens 630cc at 49psi and they behave at lower rpms fairly well. I have seen a lot of really cheap budget turbo builds and they dont last long. The engines that are built for boost (correct compression\charge cooling) and proper (fuel/ign/wideband) control seem to keep running for years. I always say, Do it right the first time, or you'll be doing it again.
Also, I'm running 1000cc injectors and have no issues at idle or low speed.
Anyone know if stock injectors will support 7-8psi?
Or, is it simply easier to add one or more injectors in the plenum. Running off a second computer, or. Same computer, and a rising rate fuel pressure regulator?
Will a barometric pressure sensor, controlling another (or sixth) injector get close?
I will not be racing, simply climbing hills behind RV’s and Logging trucks. Really dont need a bunch of boost. Don’t care much for the second cam. As low rpm boost is fine, free power.
Innovative wideband installed.
The only place these cars make power is on the second cam, boost or not.