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Originally Posted by illumina Allante 4.5 liter intake manifold, both upper and lower,
Allante steel rocker arm supports,
Allante fuel rail,
Allante throttle body (TB).
All of this can be had for $250.00!!! (Another $20.00 for shipping.). |
Awesome!! Hopefully it isn't too tuned, turbos aren't the fondest of intake tuning for NA engines, it can make them peaky. But I don't think it should be a problem at all.
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Originally Posted by illumina Basically what I was thinking was that the Allante intake manifold is much more open and could possibly support 8 more fuel injectors in addition to the 8 already on there for a total of 16 injectors: 8 for the stock system; 8 for the auxiliary system. I can fine-tune the auxiliary fuel system for boost and keep it quiet under normal driving so as not to disturb the stock fuel system while under closed-loop/part throttle operation. With all 16 injectors, it should be safer to tune this thing out.
Let me know what you think. |
8 injectors addtional seems pretty excessive, you won't need that much. Not to mention the plumbing of them. But then again, they require the same pressure as the rest. A potential issue is with all 16 injectors dumping fuel it very well might overcome the capacity of the fuel pump. A 255 liter/hr pump might be needed to keep up with the demand. Again, an issue is if the injectors are boost side, you will need boost pressure+fuel pressure to keep the same fuel pressure relative to the injectors. A special boost referenced regulator is required.
I like the ease of the TBI unit, and how easy it would be to trigger it (2 drivers instead of 8). I will look into having 8 injectors to drive and see what I can come up with. I can't imagine needing large injectors, smaller here might be a good thing. Consider at WOT and 14.7 psi boost (1 bar) you, in theory, would need 2x the fuel delivered over stock. That is assuming that you have 100% VE at stock and used all of what you had, and boosted you are equally efficient, 200% VE by then. But in reality a boosted engine will see more like 120-130% VE (Volumetric Efficiency). And stock engines are typically more like 80-85% VE at best. And that is not always at all RPM's. It might be 50% VE at 1000-2000 rpm, 75% by the time you hit 2500 rpm, etc... Maybe peak at 85% for a short time at 5000 rpm. MAYBE. If the planets line up.... And how to calculate?? Dyno time.... BSFC, power and rpm make up some of it.
So I would anticipate if all was running well, you would need upwards of 45% more fuel than stock. So like 30 lb injectors would handle it all with only the stock 8 locations. And then tweak the code in the ECM (the BLM value and the fuel cells) to supply it when boosted (>1 bar on the MAP)