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wideband A/F meter and tuning.

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mini-dunger

Post subject: wideband A/F meter and tuning.

Posted: Mon Dec 29, 2014 4:35 pm

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

Hi all

just wondering if anyone on here is using a wideband AF meter in their mini with a single SU.

I have had limited experience with it but it has been quite an insight into the actual tune of my engine. Ive been able to set my idle mixtures to exactly 14.7 to 1.

Im just curious how rich is too rich? under hard acceleration it richen up all the way to about 10 - 1.
it begins to lean up again as the engine load is lowered.

on over run and cruising speeds it may creep up to 16-1. this is not really an issue as the engine is making very little power at this point.

I am running a needle that most charts sites etc etc have recommended for my engine with the mods i have done. I think its an aau.. (1 1/2 su)

I would be inclined to think the needle should be slightly under fueling as the engine and head have been worked quite a bit.

just curious what readings you guys have seen?

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blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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mini-dunger

Post subject: Re: wideband A/F meter and tuning.

Posted: Mon Dec 29, 2014 4:44 pm

1275cc

Joined: Thu Jun 08, 2006 9:34 pm
Posts: 2372
Location: Adelaide

im currently running an aau needle

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blokeinamoke wrote:

Yep Mokes are ugly - but Moke owners know that. Its like ugly women - she may be a dog but you know your going to get some :wink:

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drmini in aust

Post subject: Re: wideband A/F meter and tuning.

Posted: Mon Dec 29, 2014 4:54 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

10:1 is way too rich.
An SU should run around 13.0 under load.
Cruising at light throttle, 15.0 or a bit more is fine.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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michaelb

Post subject: Re: wideband A/F meter and tuning.

Posted: Mon Dec 29, 2014 7:30 pm

1275cc

Joined: Sun Jan 21, 2007 9:16 pm
Posts: 3166
Location: North of the Harbour planning my next mini project

Quote:

10:1 is way too rich.
An SU should run around 13.0 under load.
Cruising at light throttle, 15.0 or a bit more is fine.

Unless you are running a Supercharger..... :roll:

_________________
1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)

2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

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drmini in aust

Post subject: Re: wideband A/F meter and tuning.

Posted: Mon Dec 29, 2014 9:49 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

Yeah, or a turbo. He's not, so I didn't confuse him.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Diesel27

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 4:14 pm

848cc

Joined: Sat Sep 21, 2013 9:47 pm
Posts: 324
Location: Melbourne West

can any one tell us if the Minty Lamb needle chart can be used to plot a graph and then have it suggest the appropriate needle?

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It's easy once you know how.

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SCA1PER

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 5:24 pm

848cc

Joined: Tue May 26, 2009 9:53 pm
Posts: 31

Sounds like you need a lighter oil in the dashpot if it is only going that rich on initial acceleration. I've used a wideband with my 1.5 SU and I was aiming for 14.5 idle, 12.5 full load, and about 16 or 17 cruise. I've used Minty Lamb and it works ok, just choose needles that are common more correct (rich or lean), in the areas needed.

Last edited by SCA1PER on Mon Jan 12, 2015 11:41 am, edited 2 times in total.

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danny_

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 5:39 pm

998cc

Joined: Sat Jul 23, 2011 9:32 pm
Posts: 1171
Location: Sydney (St George area)

Sorry to hijack.
What af would you recomend for a 8v fuel injected twinky?
Load is as low as 9:1 and 10:1
light throttle is 10-13.6
idle is unknown at this stage.

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drmini in aust

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 5:58 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

danny_ wrote:

Sorry to hijack.
What af would you recomend for a 8v fuel injected twinky?
Load is as low as 9:1 and 10:1
light throttle is 10-13.6
idle is unknown at this stage.

I reckon 12s under full load,
15-16 light throttle cruise,
14-15 idle.

As you DON'T have a huffer or a turbo. :lol:

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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danny_

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 6:06 pm

998cc

Joined: Sat Jul 23, 2011 9:32 pm
Posts: 1171
Location: Sydney (St George area)

drmini in aust wrote:

danny_ wrote:

Sorry to hijack.
What af would you recomend for a 8v fuel injected twinky?
Load is as low as 9:1 and 10:1
light throttle is 10-13.6
idle is unknown at this stage.

I reckon 12s under full load,
15-16 light throttle cruise,
14-15 idle.

As you DON'T have a huffer or a turbo. :lol:

I will adjust again.
The pipe you made up is working great.. It's been on the car all week and still going strong.
cheers.

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drmini in aust

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 6:15 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

The tailpipe sniffer doesn't allow idle readings because of the in-out airflow at idle. That dilutes the exhaust so it reads max lean.
If you want to get an accurate idle reading, weld the spare sensor nut onto the bottom of the headers and plug the sensor in there. When you're done with testing, screw an M18x1.5 plug into it.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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danny_

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 6:19 pm

998cc

Joined: Sat Jul 23, 2011 9:32 pm
Posts: 1171
Location: Sydney (St George area)

drmini in aust wrote:

The exhaust set up had a bung with no thread (capped with some metal rod) .. It popped off on the m5 and i had to weld a nut onto it about a month ago.
I might go to my local exhaust shop and see if they sell the correct size bung.

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doc.martin

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 7:14 pm

848cc

Joined: Fri Jun 01, 2007 9:46 pm
Posts: 35
Location: Gold Coast

As a side.. I have been looking at these for a while...
What brand/model of wide band A/F meter are you using? And would you recommend?

Cheers
Doc.Martin

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danny_

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 7:45 pm

998cc

Joined: Sat Jul 23, 2011 9:32 pm
Posts: 1171
Location: Sydney (St George area)

http://www.streetfx.com.au/product/inno ... part-3844/

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drmini in aust

Post subject: Re: wideband A/F meter and tuning.

Posted: Tue Dec 30, 2014 7:58 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

I have the same. I put it in a box and made it portable.
Sensor supplied is a Bosch.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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