| Author |
Message |
Sigurd
Samba Member
Joined: April 18, 2006
Posts: 2639
Location: Rockford, IL
|
 Posted: Wed Oct 12, 2011 4:37 pm Post subject: |
 |
|
| Is the progression circuit fixed, or can how long it lasts be changed? I ask because that what it seemed like when I had the 55s in there. Maybe a better way of asking is this; does putting in a huge idle delay transition? Because with that 50 in there sure made transition appear real quick. |
|
| Back to top |
|
 |
Sigurd
Samba Member
Joined: April 18, 2006
Posts: 2639
Location: Rockford, IL
|
| Posted: Thu Oct 13, 2011 7:46 am Post subject: |
|
|
| I went to start it this morning and things went a little rough without the accelerator pumps. I usually have to nurse things along with my foot until it warms a bit. So here's the thought even though I may have answered this in an earlier post. Now that I know how much of a transition hole I have, can I turn the pumps up a little to patch that hole? The side benefit is easier starting in the morning. Or should I continue tuning the air jets to get rid of the hole without overlap and THEN turn the pumps up? |
|
| Back to top |
|
|
boxcar
Samba Member
Joined: July 23, 2008
Posts: 20
Location: North NJ
|
| Posted: Thu Oct 13, 2011 4:08 pm Post subject: |
|
|
hi,
im interested in which wideband analyzer you use.
thanks
EK |
|
| Back to top |
|
|
Sigurd
Samba Member
Joined: April 18, 2006
Posts: 2639
Location: Rockford, IL
|
| Posted: Thu Oct 13, 2011 4:10 pm Post subject: |
|
|
| Innovate LM-1. |
|
| Back to top |
|
|
[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
|
| Posted: Thu Oct 13, 2011 8:45 pm Post subject: |
|
|
keep the pump squirts small, you don't have to turn them off. Just don't over-use them, they really confuse carb tuning if they are too big.
_________________
It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
"Like" our Facebook page at
http://www.facebook.com/vwpartsaircoolednet
and get a 5% off code for use on one order for VW Parts ON OUR PARTS STORE WEBSITE, vwparts.aircooled.net |
|
| Back to top |
|
|
Sigurd
Samba Member
Joined: April 18, 2006
Posts: 2639
Location: Rockford, IL
|
| Posted: Fri Oct 14, 2011 9:46 am Post subject: |
|
|
| [email protected] wrote: |
| keep the pump squirts small, you don't have to turn them off. Just don't over-use them, they really confuse carb tuning if they are too big. |
...and they were doing just that. I couldn't feel that lean hole with ANY air jet I tried previously. Driving without the pumps has REALLY helped me understand how these carbs work (and made cold starts fun LOL).
52/180/200 now, pumps disconnected. This is all at part throttle around the transition point. No WOT at all. The 200 airs have lessened the stumble that I got with the 180 airs (180 main is obviously wrong). If I'm in third around 45mph and JUST on the throttle just maintain speed, and then open it a little more, it goes, stumbles and then goes. That stumble is the lean hole, and I can see it on the meter as 23 and then a quick swing to 14. I'm going to try the 210 air.
One peculiar thing I noted with the 200, (and didn't think to test with the 180) was that at speed (45mph, 3rd gear, light throttle), if I roll on the throttle ever so gently, I get no lean hole or stumble. Does this mean that I'm done with the air jetting? Because if that's the case, I'll do the mains, and then hook the pumps back up.
 |
|
| Back to top |
|
|
[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
|
| Posted: Fri Oct 14, 2011 9:50 am Post subject: |
|
|
it's NORMAL to have a slight lean hole when you open the throttle, that's what the pump squirt covers.
When the engine is running, the air in the main and fuel in the main circuit are moving. If you increase the throttle, the air can speed up quickly, the fuel cannot, because fuel has more mass and takes a "delay" to get going. This causes a temporary lean hole which is completely normal. The squirt is meant to fill that in, but many people use it to cover up other carb tuning problems.
I think at 200 air you are probably where you need to be, so add pump squirt now to cover it, then put the main you need and you are finished.
_________________
It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
"Like" our Facebook page at
http://www.facebook.com/vwpartsaircoolednet
and get a 5% off code for use on one order for VW Parts ON OUR PARTS STORE WEBSITE, vwparts.aircooled.net |
|
| Back to top |
|
|
Sigurd
Samba Member
Joined: April 18, 2006
Posts: 2639
Location: Rockford, IL
|
| Posted: Fri Oct 14, 2011 10:24 am Post subject: |
|
|
Thanks, John. I'll leave the 200 for now, though I might put the 180 back in to see if I can get a smooth transition by rolling on really slowly.
This is 52/148/200 in 3rd gear from 2000-5000rpm. You can see the hole, the stumble and then it goes down to 11:1 and then climbs. I lifted just before 14s. Why does the AFR climb and peak and plateau like that?
I also have 140, 142 and 145 mains. |
|
| Back to top |
|
|
Sigurd
Samba Member
Joined: April 18, 2006
Posts: 2639
Location: Rockford, IL
|
| Posted: Sat Oct 15, 2011 7:31 am Post subject: |
|
|
| Thoughts from anyone? I've got a free and clear weekend to do tuning. |
|
| Back to top |
|
|
[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
|
| Posted: Sat Oct 15, 2011 8:29 am Post subject: |
|
|
the graph is pretty meaningless without knowing load (throttle position).
_________________
It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
"Like" our Facebook page at
http://www.facebook.com/vwpartsaircoolednet
and get a 5% off code for use on one order for VW Parts ON OUR PARTS STORE WEBSITE, vwparts.aircooled.net |
|
| Back to top |
|
|
Sigurd
Samba Member
Joined: April 18, 2006
Posts: 2639
Location: Rockford, IL
|
| Posted: Sat Oct 15, 2011 8:42 am Post subject: |
|
|
| I was at part throttle to get through transistion from 2-6s. At 6s, I went WOT. |
|
| Back to top |
|
|
modok
Samba Member
Joined: October 30, 2009
Posts: 26778
Location: Colorado Springs
|
| Posted: Sat Oct 15, 2011 11:42 am Post subject: |
|
|
What rpm is the rich spot?
How does the car run with with normal jetting (57,140,180)?
Do excuse me not reading the first 8 pages but I just see this odd jetting, then a graph that looks exactly like what that odd jetting would produce, and apparently that is a problem? |
|
| Back to top |
|
|
|
