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Home > Help Needed / General Tech Chat > Lean on idle? different needle?

JT

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2496 Posts
Member #: 637
Post Whore

Hertfordshire

Hi

I've got the mini back in the road again.
Now I have a AFR gauge fitted. So I can see what's going on with the fueling.
I have a standard bdd needle in with transmission oil in the dashpot. On with a thicker spring.
At idle it reads blank ad in really lean. It doesn't idle happily either and has bad throttle response.
I've checked for an air leak but found no leaks.
Full throttle it spikes to about 10.2 then settles to about 12.
Is there a needle that is the same top end as the bdd but richer at idle and part throttle?

Thanks
Josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985


Joe C

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11869 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

Well for idle you just need to turn the screw...

If it's jumping around afraid wise, I'd swap the plugs out, and also check the dashpot oil. Maybe thicken it up a bit.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

http://s95.photobucket.com/albums/l154/min...2006/?start=all



gr4h4m

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4649 Posts
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Chester

Move the jet down a little?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!


Joe C

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11869 Posts
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Carlos Fandango

Burnham-on-Crouch, Essex

Also, choke seals is a good one for screwing up the idle mix

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

http://s95.photobucket.com/albums/l154/min...2006/?start=all



JT

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2496 Posts
Member #: 637
Post Whore

Hertfordshire

What do you mean swop the plugs out?

I've got transmission 90 in. So it's thick stuff in there.

I rebuilt the carbon a few years ago and used the carb for about 500 miles.

Do I screw it in to ritchern it?

Thanks

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985


Joe C

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11869 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

pugs dont like getting wet with fuel, it can cause misfires, or just not firing at all, a misfire will skew the AFR , so its worth swapping the plugs for a new set to see if it makes a difference, basically always have a new set of plugs on standby, because you will get one go down at some point.

yeah, i'm sure its in to ritchen on the HIF's

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

http://s95.photobucket.com/albums/l154/min...2006/?start=all



tadge44

2836 Posts
Member #: 2500
Post Whore

Buckinghamshire

If it is no better after new plugs have you not considered filing the needle ?


Turbo Phil

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My sister is so fit I won't show anyone her picture

Lake District

Set the idle mixture correctly then see what the fuelling is like when driving then. Once you've set the mixture at idle (screw in to make it richer & out to lean off) it's the profile of the needle that dictates the mixture elsewhere. If you find it's incorrect under load you'll need to start filing it.

Phil.

WWW.TURBO-MINI.COM


JT

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2496 Posts
Member #: 637
Post Whore

Hertfordshire

It doesn't sound like it's missing. But I have wetted the plugs a few times!
I've got the idle screw all the way in now and I've pushed the needle up into the dash pot a bit to richer it up. It's still a bit lean at idle. Showing 16 on the far, but as soon as I blip the throttle it goes richer and has better response.

Is there not a difervent needle I could try off the shelf beforeI start filing my current needle?


Thanks
Josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985


burcy35

96 Posts
Member #: 10990
Advanced Member

Hornsea

Hey josh
Avonbar sell different needles that are already filed down that should get you nearer.

Roy B


JT

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2496 Posts
Member #: 637
Post Whore

Hertfordshire

Thanks Roy I ordered a 14psi one earlier. Just hope it's a bit richer at idle.
Top end the bdd isn't far off.

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985


Turbo Phil

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4113 Posts
Member #: 20
My sister is so fit I won't show anyone her picture

Lake District

There should be no issue at idle with a BDD , there's plenty of adjustment on the mixture screw. I doubt the Avonbar needle is any different at idle. I'd say you've got an issue elsewhere.

Phil.

WWW.TURBO-MINI.COM


JT

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2496 Posts
Member #: 637
Post Whore

Hertfordshire

Hmm I'll look for a air leak again but it seemed fine when I checked the other day.
What else do you think it could be?

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

Home > Help Needed / General Tech Chat > Lean on idle? different needle?
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