Type IV upgrades and FI, Where's the cut-off to carbs? |
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Type IV upgrades and FI, Where's the cut-off to carbs? |
boxsterfan |
Jan 7 2014, 12:42 PM
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#1
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
At some point, my motor (1974 2.0L) will need a rebuild. I'm not going to go the /6 conversion on this car. If I rebuild the motor to a 2056 or 2270 displacement, can I still use the FI system (D-jet)? Or is there some spot in here where it is better to switch to carbs? Or if I wanted to have FI then switching to L-Jet instead?
Happy to do some reading if you have it... (IMG:style_emoticons/default/chowtime.gif) |
Chris Pincetich |
Jan 9 2014, 10:36 AM
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#2
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B-) Group: Members Posts: 2,082 Joined: 3-October 05 From: Point Reyes Station, CA Member No.: 4,907 Region Association: Northern California |
There's some great FI info to read about here on 914 World about applying CIS FI to larger displacement (and turbo) TIVs. The L-jet would be cool because it is an "original" 914 FI system, and CIS is cool because it would look more like a 911 (IMG:style_emoticons/default/beerchug.gif) CIS suffers from the same problems as the stock L-Jet with high overlap cams. The air flow plate flutters in the reversion pulses, causing incorrect fuel mixture. The CIS 911 engines had a LOT milder cam profiles than the carbed or MFI engines to correct this. Yep, cool, thanks! (IMG:style_emoticons/default/beerchug.gif) So Clay, if a hypothetical 2270 TIV was built with a mild cam focused on street driving and low-end torque (great for the weekend AX!) and designed around an FI system, and the build was by a novice hoping for low costs and easy assembly + tuning, would you go with L-jet or CIS?? (IMG:style_emoticons/default/huh.gif) (IMG:style_emoticons/default/idea.gif) PS: or D-jet with resistors, re-calibrated MPS etc?? PPS: I know the advantages of new, aftermarket FI options. Just inquiring about old "Porsche parts" retrofitting (IMG:style_emoticons/default/smile.gif) |
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