 FI or Carbs?, Performance |
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| f4fighter |
 Sep 21 2010, 05:19 PM
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#1
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Newbie  Group: Members Posts: 4 Joined: 2-September 10 From: Churubusco, IN Member No.: 12,130 Region Association: None  |
I was debating on sticking with the FI or going to duel carbs on my 72 1.7. The FI on the engine is in pretty sad shape and probably need new everything (not to mention I'm no FI wizard). My father-in-law says to convert to duel webers.
As far as performance, do I stand to gain more with a duel carb set-up or should I spend the money on upgrading my FI set-up? Thanks, Bret |
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| underthetire |
Sep 21 2010, 05:21 PM
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#2
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
(IMG:style_emoticons/default/welcome.png)
And here we go again........ (IMG:style_emoticons/default/ar15.gif) Stock motor FI is way better. |
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| SirAndy |
Sep 21 2010, 06:09 PM
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#3
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Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(underthetire @ Sep 21 2010, 04:21 PM)  Stock motor FI is way better. (IMG:style_emoticons/default/agree.gif) The carbs will get you going if the FI is in bad shape, but don't expect to gain any power from them. On a stock motor FI is the better choice. (IMG:style_emoticons/default/popcorn[1].gif) Andy |
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| trent1542 |
Sep 21 2010, 08:57 PM
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#4
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Member Group: Members Posts: 98 Joined: 19-August 10 Member No.: 12,074 Region Association: Pacific Northwest |
stick with FI. I would go with D-jet fuel injectors if you want to keep it simple. I'm going to have twelve 1.7L injectors here pretty soon so I might be selling the ones I don't use later...
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| RonnieJ |
Sep 22 2010, 06:19 AM
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#5
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RonnieJ Group: Members Posts: 230 Joined: 16-June 03 From: Sterling Heights, Michigan Member No.: 829 Region Association: Upper MidWest |
If you switch to dual carbs change your cam to accomodate carbs, that's the only way you'll be happy with them. I'm having my engine rebuilt right now and beefed up and am changing my cam because it never ran well with carbs.
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| sean_v8_914 |
Sep 22 2010, 07:56 AM
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#6
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
I love the way the early 1.7s run with FI. gas milage is awesome and the 1.7 is the toughest type 4
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| sean_v8_914 |
Sep 22 2010, 07:58 AM
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#7
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
...but like Andy says: carbs will get it off the jack stands sooner. sad but true
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| Tom_T |
Sep 22 2010, 07:01 PM
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#8
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TMI.... Group: Members Posts: 8,318 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California 
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Bret - d-jet is the best for your engine, cuz re-camming is rebuilding the motor, then - as long as your in there - more displacement, power, etc. & it's way more expensive rebuilding the motor, than getting the stock D-jet fixed on a stock 72 1.7 if it's running right & not needing an engine overhaul anyway.
BTW - 72 was the last year on CA 1.7's where you still got 85 hp on the d-jet stock, due to more stringent smog limits, so they detuned it for 73 MY. IMHO 72 is the best MY for a 1.7, also due to the interior & shifting improvements. I don't know WTF "Churubusco" is, but if you're close to GPR, AA, or any of the other parts suppliers around you or on the member vendors section, etc., then get with them for the EFI parts you'll need to get yours right. |
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| Cj Honeycutt |
Sep 22 2010, 07:10 PM
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#9
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Member Group: Members Posts: 50 Joined: 7-August 10 From: Fallbrook, CA Member No.: 12,020 Region Association: Southern California |
unless u are planning on racing it carbs work fine, the only problem would be starting it up cold, u may need to let it "warm up" for about 5 mins in higher altitudes or below freezing weather but i have duel webers and they work just fine as long as they are balanced and tuned correctly
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| Rod |
Sep 23 2010, 01:13 AM
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#10
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Senior Member Group: Members Posts: 616 Joined: 1-January 08 From: Farnham UK Member No.: 8,526 Region Association: England |
I have an early 1.7 running FI and I love the engine combo.
The only problem I have had was with the 37 year old wiring getting a bit fragile and the connectors cracking at the fuel injectors causing it to drop a cylinder, it went through three before I bought a new engine bay loom from Jeff Bowlsby... Which transformed the car.. It pulls from 1000 rpm in fourth without any judder or complaints. If you can get the FI working, leave it in - it is a very reliable and surefooted system and my car has NEVER Let me down! It has always started, run and restarted when hot and has never been on jackstands (IMG:style_emoticons/default/smile.gif) |
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| johannes |
Sep 23 2010, 05:06 AM
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#11
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Club Porsche 914 France President Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
Your FI may not be faulty and changing for carbs will not necessary solve the problem. How is your compression and ignition ?
If FI is faulty, it also may be cheap to fix because wires and connectors could be the weak point. Changing for carbs will also affect value of your car for future resale. |
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