Colin, just megasquirt your bus already.
luft with squirt
Gas Mileage in the AC Vanagon, 1980
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- Old School!
- Location: Little Rock, AR
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Re: Gas Mileage in the AC Vanagon, 1980
1981 Volkswagen Vanagon Westfalia - air-cooled Type4 1970cc CV (hydraulic lifters, 42x36 valves, stock cam, microSquirt FI with wasted spark ignition)
1993 Ford F-250 XL LWB Extended Cab 7.3L IDI
1993 Ford F-250 XL LWB Extended Cab 7.3L IDI
- Amskeptic
- IAC "Help Desk"
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Re: Gas Mileage in the AC Vanagon, 1980
When its current L-Jet fails, we will talk about it (some time in 2037)luftvagon wrote:Colin, just megasquirt your bus already.
luft with squirt
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
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- Old School!
- Location: Little Rock, AR
- Status: Offline
Re: Gas Mileage in the AC Vanagon, 1980
In terms of vacuum, at 3300-3700 RPM, pulling about 65mph, I'm anywhere between 6.23 inHg to 3.57 inHg. I will need to attach GPS to my logging unit to give you exact numbers. Not sure about head temperatures. Probably significantly lower than with the perfectly factory tuned stock unit. I'm recording about 160-190F through the intake runner bolt sticking out of the head on cyl#3.
Anything lower than 3.28 inHg, and my mixture starts to go from 13.5 AFR to 12.6 whilst approaching 0 inHg.
:digital
Anything lower than 3.28 inHg, and my mixture starts to go from 13.5 AFR to 12.6 whilst approaching 0 inHg.
:digital
1981 Volkswagen Vanagon Westfalia - air-cooled Type4 1970cc CV (hydraulic lifters, 42x36 valves, stock cam, microSquirt FI with wasted spark ignition)
1993 Ford F-250 XL LWB Extended Cab 7.3L IDI
1993 Ford F-250 XL LWB Extended Cab 7.3L IDI
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- Old School!
- Location: Seattle, WA./HB. Ca./Shizuoka, Japan
- Status: Offline
Re: Gas Mileage in the AC Vanagon, 1980
With lean tune cruising it's important to remember the (1) area to stay out of when under load WOT....
14:0 - 15.5:1at WOT (Highest EGT/CHT temps.
Anything under 3/4 throttle and you are NOT hot enough to worry about being to lean AFR wise.
16-17 AFR is where you'll make great MPG's. No leaner than 17 (lean miss w/light load) Lean cruise tune only with vacuum advance distributor or mapped EFI. Not with centrifugal only. With a cracked throttle one is NOT on the main circuit (carbs/s). Main circuit is over ~1/4 throttle.
See where CHT's go from peak lean EGT (leaner)...
14:0 - 15.5:1at WOT (Highest EGT/CHT temps.
Anything under 3/4 throttle and you are NOT hot enough to worry about being to lean AFR wise.
16-17 AFR is where you'll make great MPG's. No leaner than 17 (lean miss w/light load) Lean cruise tune only with vacuum advance distributor or mapped EFI. Not with centrifugal only. With a cracked throttle one is NOT on the main circuit (carbs/s). Main circuit is over ~1/4 throttle.
See where CHT's go from peak lean EGT (leaner)...
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1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's
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- Addicted!
- Location: Thomasville Georgia
- Status: Offline
Re: Gas Mileage in the AC Vanagon, 1980
Holy thread resurrection, Batman!
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Re: Gas Mileage in the AC Vanagon, 1980
Always good to blast reminders from the past. To that end, I have never been able to get a Volkswagen to run at 16 AFR and successfully dive down into the 12s under acceleration without having a dreadful mid-throttle hot zone.
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
-
- Old School!
- Location: Seattle, WA./HB. Ca./Shizuoka, Japan
- Status: Offline
Re: Gas Mileage in the AC Vanagon, 1980
The pleasures of an IDF or Dell set up.
Define a mid throttle hot zone.
If your on the main jets (not part/cracked throttle) under load (correct jetting) you should be ~ 13:0 - 13:5 or so. But if you are loafing along on the highway flats or around town there is nothing wrong with a lean tune cruise of 15:5 - 17 AFR.
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's