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Home > Help Needed / General Tech Chat > Fueling at start | |||||||
113 Posts Member #: 11786 Advanced Member |
12th Mar, 2019 at 09:44:51pm
Hey guys,
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2742 Posts Member #: 637 Post Whore Hertfordshire |
13th Mar, 2019 at 02:32:10pm
Try the standard bdd needle and block the part throttle lean off. Edited by JT on 13th Mar, 2019. My build thread..
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113 Posts Member #: 11786 Advanced Member |
13th Mar, 2019 at 03:00:59pm
The BDD is a bit leaner at the top - so i would get richer at bottom. Do you think i run lean when starting and thats the rattling? But why does it idle so rich then? |
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113 Posts Member #: 11786 Advanced Member |
16th Mar, 2019 at 06:20:44am
The part throttle lean off didnt change anything at start.
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2742 Posts Member #: 637 Post Whore Hertfordshire |
16th Mar, 2019 at 08:46:12am
Have you tried adjusting the idle mixture screw on the carb?
Edited by JT on 16th Mar, 2019. My build thread..
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113 Posts Member #: 11786 Advanced Member |
19th Mar, 2019 at 07:44:04am
I have now adjusted the mixture a bit to lean. also changed the damper oil to 20w50. It idles now at 11.5 and idles way smoother. The rattling is (almost) gone. The afr while driving looks good too.
Edited by JackZwiebel on 19th Mar, 2019. |
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806 Posts Member #: 989 Post Whore North Yorkshire |
19th Mar, 2019 at 11:09:26am
The rattling isn't pre-ignition, is it? Are you using a distributor or mapped ignition? |
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113 Posts Member #: 11786 Advanced Member |
19th Mar, 2019 at 11:42:31am
I'm using the standard metro turbo distributor and i set it to the factory settings (approx. 7degree at 1500rpm with disconnected vac.).
Edited by JackZwiebel on 19th Mar, 2019. |
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113 Posts Member #: 11786 Advanced Member |
19th Mar, 2019 at 03:46:17pm
I'v been thinking and pre-ignition doesnt particular mean that the ignition is too advanced right? Or should i try retarding the ignition a bit? |
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12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
19th Mar, 2019 at 07:21:05pm
Drop gear rattle? 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 https://joe1977.imgbb.com/ |
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113 Posts Member #: 11786 Advanced Member |
19th Mar, 2019 at 07:33:53pm
no, dont think its the drop gear. its a too low frequency for drop gear - also a too high for the clutch. Also too strong for the drop gear, it was reall hard rattle that shakes the whole car.
Edited by JackZwiebel on 19th Mar, 2019. |
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806 Posts Member #: 989 Post Whore North Yorkshire |
20th Mar, 2019 at 11:25:05am
With a correctly timed in distributor and tick over CO set correctly there should be no risk of pre-ignition at tick over. If you had had mapped ignition it might have been a rogue number causing a problem. Have you got a wideband air/fuel ratio meter fitted?
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113 Posts Member #: 11786 Advanced Member |
20th Mar, 2019 at 12:40:01pm
I will check the ignition again today and see if it still occours. If so i will take a video.
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806 Posts Member #: 989 Post Whore North Yorkshire |
20th Mar, 2019 at 04:32:49pm
My understanding is that it is caused by running too lean and/or too advanced ignition timing.
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113 Posts Member #: 11786 Advanced Member |
20th Mar, 2019 at 05:39:36pm
I had some, it was running better there
Edited by JackZwiebel on 20th Mar, 2019. |
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4619 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
20th Mar, 2019 at 08:53:07pm
If you’re already using 20/50 oil, try a stronger spring. It’s a bit of a balancing act to get right but worth some effort.
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113 Posts Member #: 11786 Advanced Member |
20th Mar, 2019 at 09:18:21pm
what afr am i looking for at transition to boost? Should it stay at 12.5 or is a bit of lean off ok? |
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113 Posts Member #: 11786 Advanced Member |
24th Mar, 2019 at 01:26:52pm
I'v been driving quite a lot this weekend and been playing around with the settings. When the engine is hot the fueli g is quite good now. 12.5 at boost and 13 when getting in boost. Off boost its quite rich...running around at 10 at cruise and 11 at idle.
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806 Posts Member #: 989 Post Whore North Yorkshire |
29th Mar, 2019 at 11:13:26am
Throw the ancient technology away and fit mapped ignition. Also, fit the correct needle and then setup your mixture. |
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113 Posts Member #: 11786 Advanced Member |
29th Mar, 2019 at 09:54:55pm
haha, yeah that thought crossed my mind several times.
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113 Posts Member #: 11786 Advanced Member |
1st Apr, 2019 at 08:15:45pm
Ok, i have been driving quite a distance now to really heat it through and test a bit.
Edited by JackZwiebel on 1st Apr, 2019. |
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113 Posts Member #: 11786 Advanced Member |
13th Apr, 2019 at 05:33:38pm
The engine now runs at 25° max advance under boost and 10psi boost with a CR of 9:1
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12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
13th Apr, 2019 at 09:12:18pm
in a word... no
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 https://joe1977.imgbb.com/ |
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113 Posts Member #: 11786 Advanced Member |
16th Apr, 2019 at 11:04:07am
ok, guess im going to drive about 1k km with the current setting to run it in a bit and then put it on the rolling road.
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113 Posts Member #: 11786 Advanced Member |
10th May, 2019 at 07:36:18am
I finally found the main problem with my engine:
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