MAP for ignition with Weber IDF - Suitable port?
- samcat
- Posts: 1088
- Joined: Tue Jun 12, 2001 12:01 am
MAP for ignition with Weber IDF - Suitable port?
Okay, going to be going ignition first then switching to full EFI once I have my head around that.
Crank trigger etc are on the way but I know I will need to either measure throttle position (TPS) or Manifold Air Pressure (MAP)..
Are the vacuum ports on the bottom edge of Weber IDFs suitable? These are NOT used for vacuum advance on a dizzy as they are not exposed by the butterfly, they are used normally for syncronising using a manometer.
Suitable?
Obviously I need a MAP sensor and some way of combining these 4 ports.. Suggestions?
Or is a TPS the way forward, and if so I do you fit one to weber IDF with Sync-Link?
Will get some pics this weekend and start head scratching and planning etc.
Thanks,
Sam
Crank trigger etc are on the way but I know I will need to either measure throttle position (TPS) or Manifold Air Pressure (MAP)..
Are the vacuum ports on the bottom edge of Weber IDFs suitable? These are NOT used for vacuum advance on a dizzy as they are not exposed by the butterfly, they are used normally for syncronising using a manometer.
Suitable?
Obviously I need a MAP sensor and some way of combining these 4 ports.. Suggestions?
Or is a TPS the way forward, and if so I do you fit one to weber IDF with Sync-Link?
Will get some pics this weekend and start head scratching and planning etc.
Thanks,
Sam
-
- Posts: 7420
- Joined: Sat Mar 10, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
Yes those ports work for map. Watch for a pulsing signal. I use all four ports, run them into a small averaging plenum, then to a restrictor right before the map sensor.
I wouldn't bother with TPS for a basic ignition setup. You just need RPM and load (map). A coolant reference is nice because you can run extra advance to help cold running manors.
I wouldn't bother with TPS for a basic ignition setup. You just need RPM and load (map). A coolant reference is nice because you can run extra advance to help cold running manors.
Steve
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- samcat
- Posts: 1088
- Joined: Tue Jun 12, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
Got cht and can easily add inlet air temp.. Any use?
-
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- Joined: Sat Mar 10, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
You can certainly play around with those later on for extracting the most from the combo.
Steve
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- samcat
- Posts: 1088
- Joined: Tue Jun 12, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
Excellent, thanks for that. Was planning on using all 4 to give a true picture of what's going on anyway.
Any idea of the diameter (id) hose needed for this?
What do people use for an averaging plenum? What sort of volume is needed?
Would an anti-pulse valve be of use as well?
Thanks once again.
Sam
Any idea of the diameter (id) hose needed for this?
What do people use for an averaging plenum? What sort of volume is needed?
Would an anti-pulse valve be of use as well?
Thanks once again.
Sam
- pdub
- Posts: 76
- Joined: Tue Feb 08, 2011 4:20 pm
Re: MAP for ignition with Weber IDF - Suitable port?
I use those ports for my MAP on my MS2. Im not sure what size vacuum line I used but it is small ID. Probably around 1/16". I use a stock fuel filter for evening out pulses. CHT/IAT sensor can be used to add timing when cold or pull when hot, assuming your ECU has this capability.
- Dale M.
- Posts: 1673
- Joined: Mon Oct 05, 2009 8:09 am
Re: MAP for ignition with Weber IDF - Suitable port?
The ports on Webers are 4 x 0.75 mm threads and there is a model airplane engine crankcase pressure tap that will fit port... Just for your FYI...
Somebody here on this site mentions it in a thread... Or maybe it was on samba..
Dale
Somebody here on this site mentions it in a thread... Or maybe it was on samba..
Dale
"Fear The Government That Wants To Take Your Guns" - Thomas Jefferson
1970 "Kellison Sand Piper Roadster"
1970 "Kellison Sand Piper Roadster"
- trbugman
- Posts: 119
- Joined: Mon Apr 01, 2002 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
2333(103x70) Type 4 DTM MS3+X on 73 Karmann Ghia ignition only with LS2 truck coils firing in sequential, fuel next.
- samcat
- Posts: 1088
- Joined: Tue Jun 12, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
Perfect, thanks. Have found the same on Amazon UK and have ordered 9 nipples (4 for the carbs, 5 for the plenum).trbugman wrote:Here you go.
Going to be using MS3 of some description for spark only initially, adding efi later.
Thanks again,
Sam
- Jadewombat
- Posts: 1447
- Joined: Sat Jun 22, 2002 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
Some example ignition maps to get you started:
http://www.shoptalkforums.com/viewtopic.php?t=98618
http://www.shoptalkforums.com/viewtopic.php?t=110006
You can start out with an ignition map similar to a distributor curve and then revise adding more advance with whatever you feel comfortable with. You'll find that crank-trigger systems can give the engine a LOT more advance though than a distributor because the systems make a far more efficient spark.
http://www.shoptalkforums.com/viewtopic.php?t=98618
http://www.shoptalkforums.com/viewtopic.php?t=110006
You can start out with an ignition map similar to a distributor curve and then revise adding more advance with whatever you feel comfortable with. You'll find that crank-trigger systems can give the engine a LOT more advance though than a distributor because the systems make a far more efficient spark.
- samcat
- Posts: 1088
- Joined: Tue Jun 12, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
Excellent, thanks for that.
MS3Pro has been ordered along with ls2 coils, coolant temp sensor, crank and cam sensor is already ordered.. Wideband is already fitted, as is CHT and Oil Temp.
Been tidying up some of the 'historic' wiring lately, getting rid of crappy connectors, fitting better (weatherpack) connectors where needed and replacing wires if there were questionable lengths/connector uses (blue bullet connector used to 'extend' a piece of wire that was too short to name but one)
Fortunately wiring is one of those jobs I enjoy!
MS3Pro has been ordered along with ls2 coils, coolant temp sensor, crank and cam sensor is already ordered.. Wideband is already fitted, as is CHT and Oil Temp.
Been tidying up some of the 'historic' wiring lately, getting rid of crappy connectors, fitting better (weatherpack) connectors where needed and replacing wires if there were questionable lengths/connector uses (blue bullet connector used to 'extend' a piece of wire that was too short to name but one)
Fortunately wiring is one of those jobs I enjoy!
- samcat
- Posts: 1088
- Joined: Tue Jun 12, 2001 12:01 am
-
- Posts: 7420
- Joined: Sat Mar 10, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
That will work as long as it is perfectly vacuum proof. I made mine out of PVC and JB. I would advise putting it in a bucket of water and blowing air pressure into it to make sure it doesn't leak. Vacuum is harder to seal than + pressure but it will give an idea.
Steve
My Baja Build
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- samcat
- Posts: 1088
- Joined: Tue Jun 12, 2001 12:01 am
Re: MAP for ignition with Weber IDF - Suitable port?
Good call.. I did run a bead of impact glue around it, but am not convinced.. Will give it a test.