| Wide band O2 is awesome [message #181415] |
Thu, 23 August 2012 10:21  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
|
Senior Member |
|
|
Running 68 jets with the lightest spring puts me in the 14.5:1 range, it movs around a lot, but cruise is pretty close to that.
I put in 66 jets and cruise went to 17:1 way too lean.
It was ay 18+:1 at idle and would bog terribly, I didn't adjust the idle mixture, but the cruise was still too lean.
So it looks like I need 67 jets.
Now I've always been told you cant tell the difference between jets less than 2 sizes apart, but that was pre wideband days.
So I think I'll buy a couple of sets of 66, 67 and 68 jets in cace the flow variations are different enough within a jet size
The other idea is to drill the 68's a little.
Anyone have experience drilling jets?
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
|
|
|
|
|
|
|
|
| Re: Wide band O2 is awesome [message #181572 is a reply to message #181565] |
Fri, 24 August 2012 12:01  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
|
Senior Member |
|
|
| hdforge wrote on Fri, 24 August 2012 09:41 |
Not sure what is healthy for these motors, but I have run around 16 to 1 on cruise without issue and got great mileage.
It was a turbo 5 audi motor with programmable fuel injection. I could set AFR by vacuum(MAP) and boost and set it for 16 to 1 at cruising speed on the flat. That was around 10-15 of vacuum. Fattened it up to 14 at 5 and then 12 when the turbo scrolled up.
The boost side doesn't apply but you might want to see how it runs at 15 to 1.
|
I'm using an LC1 with their analog gauge, I quite like it.
Absolutely, I'd love to see 15.5:1
I even bought an exhaust temp gauge to make sure I don't burn up the valves.
eventually I'll put on a TBI system and then can dial in the AFR better 
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
