[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
Yes, to a degree. Lumpy cams tend to have an issue with the pressure sensors though. Yes, the systems compensate to a point... but that point can be extended out by increasing the fuel pressure which enrichens the entire mixture curve evenly. > > Can you hop up motor and still run the FI? I've fallen in love with the FI > on my son's '69SB and want to keep it on my car. As I understand the FI, it > is working mainly on the manifold pressure. This seems to be based on the > idea that the manifold pressure would exactly relate to actual volume of air > passing throught the intake tubes. So. . . it seems that if I added large > valve, hi flow heads and a mildish cam to take advantage of the flow, the FI > system would compensate and continue to add in just the right amount of > fuel. The BMEP would stay the same, only at higher RPM's, thus giving more > power. > I guess the specific questions would be: > > 1. If I keep the displacement the same, can I add a mild cam (275-285 > degrees, like in a Porsche 912) and hi flow heads with the same compression > ratio, will the FI work? Target red line would be about 5200 rpm. Mild cam should be OK, Youll have to noodle with the injection a bit but the stock system should do it. > > 2. What happens if I increase compression, or achieve the same result by > ceramic coating piston domes and combustion chambers? Increased compression makes the motor run hotter... and your limited by the Type 3 cooling system unless you start doing some really fancy things. Anyone heard from Shad Laws lately? he'd have some infor on coated pistons and compression chambers, maybe Jim A will chime in here too. > > 3. Will the FI work with an increase in displacement? Up to about 1800 or 1900 cc no problem, just increase the fuel pressure. > > 4. I see two easy ways to make adjustments to the FI, by fooling with the > Pressure sensor, and with the fuel pressure regulator. Upping the fuel > pressure would seem to richen the whole range from idle to WOT. I'm not > exactly sure how fooling with the Press sensor would affect things. Yes, but the pressure sensor ISNT easy to simple adjust... there is alot of info out there as to how they are built and how they work. Learn learn learn before you start adjusting it or you are likely to end up with a sensor that is defunct. > > 5. I remember reading at some point in the past that there was a company > somewhere on the west coast that could rebuild the ECU, onyone know who that > was and if they are still around? Not aware of any > > Any comments or experience about this would be greatly appreciated. I know, > it sounds like I wanna be a darksider and not, like having my cake and > eating it too. :o) Here is another idea... if you go 1.9 or 2L get a stock 2L injection system off a 914 Porche with the larger injectors and it is going to be a closer match to the bigger engine your building. OR get really dark (have I spent too much time breathing parts washer fumes tonight?) and fit an L jet system to it and have more tuning options and a more advanced system.... Keith > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~