Why EFI?, maybe excellence was expected and they came as close as they could.. |
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Why EFI?, maybe excellence was expected and they came as close as they could.. |
Gunn1 |
Jun 11 2016, 03:59 PM
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#1
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Senior Member Group: Members Posts: 1,021 Joined: 14-February 16 From: Minnesota Member No.: 19,670 Region Association: None |
Did Porsche eff up?
No they didn't eff up, they did the best they could with the new technology they had. It seems as though the technology was purchased by the folks at Bosch from the aviation component of Bendix. That said most Injection systems were originally good at idle and full open throttle, so primarily racing applications. So in there infancy not well suited for automobile applications. Been reading on different types of fuel delivery systems and their pro and cons. There are very few con's to todays EFI systems, there were however performance and reliability issues with the original designs. Even today Claims of increased HP, Fuel economy, drivability, reliability and so on....some still dispute how much these differences really mean. It appears the main thing EFI does extremely well over Carbs is in the pollution factor, or in this case the ability to pollute less. Carbs are a some what open system allowing hydro carbons to escape/vent in to our atmosphere even when the engine is at rest, where as the EFI is essentially a closed system releasing no vapors or gases unless the engine is running and those gases are then coming out of the tailpipe from the exhaust cycle. Many of the Guru's (about 5 to 1) prefer carburation. The above Statement isn't correct, although what confuses this OP is the sheer amount of photographic evidence on this site and others including evilbay and CL showing most engine compartments with Carbs installed. Many here have spent thousands on their cars, and what do you see when the lid is lifted? a Carburated engine..... So while my intentions will be keeping my cars in their stock or near stock form, with EFI, I cannot understand why so many Carburated cars. (Because its easy isn't an answer, because its simple isn't an answer and because its cheap isn't an answer) With this being the case, Did Porsche mess up when they went the EFI route with the 914? I do not believe they messed up, I believe they did the best they could with the available technology they had. Granted they did sort of use the end user as of a kind of a guinea pig/test bed, but what manufacturer doesn't in some way. WHY DID THEY DO IT????? I think that just as much as seeing the Ljet and Djet as a performance and platform to develop future EFI systems off of, Porsche and others also incorporated EFI into there products to show they were progressive company's in design and practicality. EFI, Unibody, Targa, Mid engine, four wheel disc, and many more attributes can be cited as Porsches View into the future. I would like to keep my car stock with the factory EFI, but increasingly getting more difficult to do with so little information backing it up. Above statement is also incorrect. In my case I think I am fortunate because I believe I have most the parts needed to reinstall the factory EFI's on all three of my cars. There is a plethora of info on both sides, but for now.... just for originalities sake, EFI will be the way I go. To those that added constructive comments and or facts to this thread... it is much appreciated...to those that took this thread as some sort of attack on their beliefs, or way to "clutter" the site, I can appreciate how you feel, but I just see those arguments as shutting down the free flow of ideas and the give and take of facts that get each of us to arrive at our own understanding of the information. |
Jake Raby |
Jun 13 2016, 01:17 PM
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Either system works fine, IF the user can tune it. The stock system is very analog, can't really be altered, or tuned, and the parts are hard to find. That said, my '76 is bone stock with EFI.
For a period of 3 years I went exclusively to PEFI for all my engines. The problem that I found was people thought that EFI didn't need anything, even though I told them the system would need baseline tuning for different elevations and weather conditions. I even had to fly to Lake Tahoe to support one engine that had been to 3 different shops after an install. Guess why the engine ran like crap? The installer (Porsche shop) installed the TPS backwards, so the engine would only idle. It pulled fuel as the engine increased RPM. I diagnosed it in 10 minutes, and fixed it in 5, but wasted two days traveling. What we fight are complexities with installs, and the more wires, lines and etc an engine has, the better the chance that a human is going to screw something up that was perfect when it left here. Thats why my engines come with carbs, at most someone sets the fuel pressure too high, or low. There's not much to screw up, and thats what matters most to me. Once someone gets to an advanced level they can add EFI themselves, and by that time I have been forgotten about, and my engine has proven it's self. That means they don't call me, which is the best case scenario. This post has been edited by Jake Raby: Jun 13 2016, 01:18 PM |
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