![]() |
|
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. |
|
![]() |
OU8AVW |
![]()
Post
#1
|
Yacht Rigger ![]() ![]() ![]() Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region ![]() |
I have a built 2056 with stock D-Jet set up based on a 1974 motor. I have it pretty dialed in and my air-fuel ratios are pretty sweet. I'm happy with how it runs, pulls and how fast it is. (It's pretty quick (IMG:style_emoticons/default/biggrin.gif) )
My next challenge is to sort out the deceleration issues. I have a decel valve installed but I am not sure that it's working or even plumed properly. I have a vacuum gauge on the way so I can test it accurately. I understand that I should test the valve by revving to 3k and dropping back to idle while looking for vacuum to happen for a short period when the air intake closes. I also see a vacuum fitting on the retard side of the distributor. I think that the die-on-decel issue comes from the AF mixture changing too quickly when the air intake is closed while the dizzy is still advanced from being revved at 3k. Is the retard side vacuum fitting used to counter act this tendency? Right now it's left open.... Thanks in advance, or retard, whichever is applicable (IMG:style_emoticons/default/blink.gif) |
![]() ![]() |
LowBridge |
![]()
Post
#2
|
Member ![]() ![]() Group: Members Posts: 370 Joined: 10-August 15 From: Lunenburg, MA Member No.: 19,045 Region Association: North East States ![]() |
I don't have an answer, but EPIC close on the post (IMG:style_emoticons/default/clap.gif)
|
era vulgaris |
![]()
Post
#3
|
J is for Genius ![]() ![]() ![]() Group: Members Posts: 982 Joined: 10-November 13 From: Raleigh, NC Member No.: 16,629 Region Association: South East States ![]() |
Are you using the 2.0 DJet setup? The vacuum fittings on the dizzy canister should connect to the ports on the throttle body.
On my old 1.7 I simply adjusted my decel valve by trial and error. Turn the adjuster nut until it behaves the way you want it to. |
boxsterfan |
![]()
Post
#4
|
914's are kewl ![]() ![]() ![]() Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California ![]() |
|
r_towle |
![]()
Post
#5
|
Custom Member ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States ![]() ![]() |
So, the advance and deceleration in the distributor are for emissions.
Try plugging both ports on the throttle body and leaving both ports on the distributor open to the air. See how you like it. Advance gives you a slightly better slow acceleration off the line without you needing to rev it up to 3k to pull away from a light...which most of us do anyways. The main advance is mechanical and happens at about 3k Rpms. The advance pulls the plates slightly advances as you pull away from a light, it has some positive affect, but not loads. The decal valve is to prevent over run as you slow down, it helps keep yr mixture lean. It pulls the plates back from full advance as y slow down, burning less fuel. The car runs perfectly fine with no Deceleration valve hooked up It runs slightly worse with no advance hose hooked up, but it's negligible if you are an aggressive driver... Rich |
OU8AVW |
![]()
Post
#6
|
Yacht Rigger ![]() ![]() ![]() Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region ![]() |
Rich,
Thanks for always replying to my questions. I have honestly tried every bit of advice you have given me. Mostly they work out pretty bad. (IMG:style_emoticons/default/poke.gif) What I'm trying to do is hook all this stuff up as it came from the factory and then back up from there. Seems like it gets better with every original bit I hook up and get tuned. |
r_towle |
![]()
Post
#7
|
Custom Member ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States ![]() ![]() |
Well carry on then.
You will learn by doing. |
Highland |
![]()
Post
#8
|
Senior Member ![]() ![]() ![]() Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California ![]() |
My car only has the distributer retard port ('74), so is it okay to leave it not connected?
Am I doing any damage by not retarding the timing at idle cause the engine seems to idle much better without the retard line hooked up? |
OU8AVW |
![]()
Post
#9
|
Yacht Rigger ![]() ![]() ![]() Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region ![]() |
Well carry on then. You will learn by doing. If we learn more from our failures than our successes I ought to be a frigging genius by now (IMG:style_emoticons/default/blink.gif) |
OU8AVW |
![]()
Post
#10
|
Yacht Rigger ![]() ![]() ![]() Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region ![]() |
A few points of question on the image....
![]() |
rhodyguy |
![]()
Post
#11
|
Chimp Sanctuary NW. Check it out. ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 22,098 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch ![]() |
Did you check the stacked elbow for cracks? Where the green and red lines in ? connect.
|
OU8AVW |
![]()
Post
#12
|
Yacht Rigger ![]() ![]() ![]() Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region ![]() |
|
r_towle |
![]()
Post
#13
|
Custom Member ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States ![]() ![]() |
Don't follow my advise.
If you are trying to sort out the vacuum leak, and performance, you may want to actually hook everything up as it's supposed to be hooked up, all elbows etc. |
OU8AVW |
![]()
Post
#14
|
Yacht Rigger ![]() ![]() ![]() Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region ![]() |
That's the idea. Maybe then i can work backwards and pull unnecessary stuff off.
|
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 16th June 2024 - 09:23 AM |
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 ... |