|
Post by Zed on Apr 5, 2018 8:20:33 GMT
Me too and I'm trying to be honest as I go rather than waiting until (hopefully) I get on top of it to post how clever I am.
|
|
|
Post by Zed on Apr 5, 2018 10:03:44 GMT
Bunged my 145's back in.
WOT should be : 12.5-13.1. I think I'm a little richer than that.
Fast cruise is maybe a tad rich too
This is jumping the gun as I'm supposed to get the idle jets sorted first and I have too much timing advance...I think.
Back to basics when I get back from jet shopping later on. π
|
|
|
Post by Zed on Apr 5, 2018 17:47:25 GMT
Now down to 50 idles. Still drives fine on these with the main stacks removed. When I say fine I mean it doesn't object, cough or splutter, but it doesn't go very fast, 35mph tops. The 48's I bought hadn't arrived so I'll have to wait a couple of days before I can try them. The more I learn, the more I find just how little I know.
|
|
|
Post by 77westy on Apr 5, 2018 18:53:57 GMT
The more I learn, the more I find just how little I know. And how little most other people know.
|
|
|
Post by sANDYbAY on Apr 6, 2018 7:06:42 GMT
The more I learn, the more I find just how little I know. And how little most other people know. And the more he learns the better heβll be when he pops over to me for the weekend and tunes up my van. ππ
|
|
|
Post by Zed on Apr 6, 2018 7:40:00 GMT
And how little most other people know. And the more he learns the better heβll be when he pops over to me for the weekend and tunes up my van. ππ Stock engine, stock carbs, doesn't need tuning. π
|
|
|
Post by sANDYbAY on Apr 6, 2018 13:33:29 GMT
And the more he learns the better heβll be when he pops over to me for the weekend and tunes up my van. ππ Stock engine, stock carbs, doesn't need tuning. π Yeah, but Iβm as tight as a ducks arse and want 40 to the gallon.
|
|
|
Post by Zed on Apr 6, 2018 16:38:27 GMT
Stock engine, stock carbs, doesn't need tuning. π Yeah, but Iβm as tight as a ducks arse and want 40 to the gallon. The way you drive I'm surprised you aren't already! The problem we heavy buses have is that anything above 30mph on a flat windless surface takes us onto the main jet circuit. This can't be much leaner or when you do occasionally press the fast pedal to maintain speed up a hill you'd make holes in your pistons. Best keep to less than 30mph if you want to lean cruise, maybe even slower... If you had a beetle, you'd be lean cruising up to 50 or even 60mph but it wouldn't make a good camper.
|
|
|
Post by chad on Apr 6, 2018 16:46:01 GMT
So that's why you now have a top speed of 35mph:
" When I say fine I mean it doesn't object, cough or splutter, but it doesn't go very fast, 35mph tops."
|
|
|
Post by Zed on Apr 6, 2018 16:52:50 GMT
So that's why you now have a top speed of 35mph: " When I say fine I mean it doesn't object, cough or splutter, but it doesn't go very fast, 35mph tops." Yep, main jets, air jets and emulsions in a sandwich box. I don't think you can do this withh all carb types. π
|
|
|
Post by popegregoryxi on Apr 8, 2018 14:21:01 GMT
So, based on these new learnings, if you where now tasked with fitting icts to a bog standard twin port, would you do anything differently, or just go for the old method of "if it runs hot, go up a jet size"?
This is definitely a hypothetical question, and nothing to do with me having to do this next week you understand....
|
|
|
Post by Zed on Apr 8, 2018 16:19:12 GMT
So, based on these new learnings, if you where now tasked with fitting icts to a bog standard twin port, would you do anything differently, or just go for the old method of "if it runs hot, go up a jet size"? This is definitely a hypothetical question, and nothing to do with me having to do this next week you understand.... You were always better at this than me! Bus, yes. Beetle with svda you could lean the idles. If you take out the emulsions you can drive just on idles. It's always low load, if you put your foot down it'll die so so lean until it won't have it then up one, it's safe and good to go lean of 14.7 because lean is also cool, the vac advance gives the lean mix time to burn. Then mains WOT without pinking or getting too hot. Here you cool by going richer than stoich, but if you go mad you loose power. Tricky without afr maybe but my mains seem to be about right, it's the idles I had richer than needed. In a beetle without svda, you need idles as rich as the mains because it's only the extra advance with vac that gives the lean mix time to burn. Don't blame me if it goes pop.
|
|
|
Post by Zed on Apr 8, 2018 16:24:31 GMT
You can lean the idles in a bus with svda but you don't get so much benefit. You might get up to 55 mph in a beetle but only 30 in a bus on just idle jets.
|
|
|
Post by Zed on Apr 8, 2018 16:26:23 GMT
LEAN ONLY THE IDLES AND EVEN THEN ONLY LEAN IDLES WITH WORKING SVDA!!!!
|
|
Eoin
Full Member
Posts: 101
|
Post by Eoin on Apr 8, 2018 16:52:52 GMT
You can imagine how many circles I went in mapping the EFI with ignition and fuel variables for every rpm / throttle position. In the end I found a good guy who knew what he was doing (found him to solve a sensor problem, then he did the tune after) and it didn't take him long watching the AFR while I drove. WOT is the easy bit, lean cruise is a PITA.
|
|