Type IV upgrades and FI, Where's the cut-off to carbs? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Type IV upgrades and FI, Where's the cut-off to carbs? |
boxsterfan |
Jan 7 2014, 12:42 PM
Post
#1
|
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) |
r_towle |
Jan 7 2014, 11:13 PM
Post
#2
|
Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Either system can go as large as you want....
You are measuring air with either the AFM for volume, or MPS for pressure. same technology used today, it's the only two ways modern cars measure air... Pressure or volume. You can tune and mps or an AFM to a certain point, and you can change your injectors and fuel pressure to make up the loss. At that point, with all the tuning...you are still limited to what the camshaft is doing. To much overlap will create flutter that affects both systems in different ways. It can be overcome...just takes more tuning. drag cars use manifold pressure huge camshafts, lots of overlap. Those cars run at WOT....so the mps is not in the way of the air flow and it's meaningless at WOT... ford still uses manifold pressure for fuel injection in some cars. Lots more use air volume measuring it with and AFM or other inline systems. Rich |
Lo-Fi Version | Time is now: 19th May 2024 - 12:13 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |