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115 Posts Member #: 2830 Advanced Member Costa del Northern Ireland :) |
18th Aug, 2008 at 06:04:21pm
ok going to have a go at setting this mini up tonight wot a/f ratio should I be aiming for ive heard 13 is ideal but a mini has to run richer so 12- 12.5??? That mini is determined to Kill me!!!! |
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
18th Aug, 2008 at 06:40:19pm
13 is a tad lean On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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152 Posts Member #: 1074 Advanced Member Northamptonshire |
18th Aug, 2008 at 07:46:29pm
I am running a downpipe lambda of 0.86 with 0.6bar boost at the moment with TBI (12.6 afr).
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 1060 Posts Member #: 588 Post Whore Delaware, USA |
19th Aug, 2008 at 03:12:19am
On 18th Aug, 2008 matnrach said:
I am running a downpipe lambda of 0.86 with 0.6bar boost at the moment with TBI (12.6 afr). I would guess at 13:1 the leaner cylinders would be too lean hence an average tailpipe reading of 12.3-12.7 would be ideal The numbers above look great to me. 13 is the theoretical best power point but the tendancy is to give a turbo a liitle more fuel to help cool the cylinders. Some peeps run even richer but there is a suspicion out there that overfuelling can make any detonation more destructive...plus it will be a bit lower on power. BTW these numbers are under accelleration, for cruise and idle you want nearer 14-14.7 and dont worry if you see 16 or so on the ovverrun Edited by Turbo Tel on 19th Aug, 2008. website:- http://www.terryhunt.co.uk
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 189 Posts Member #: 1774 Advanced Member Sydney AUS |
19th Aug, 2008 at 08:01:55am
Dont forget also that the lambda sensors send spikes too... so 'too rich' can show up wrong and too lean also show up wrong, its good to get the overall A/F true though... mine was at one stage hitting 16+ on full boost... but richened up now.
1132cc Turbo ~120 bananas ATW - Fun Fun Fun
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152 Posts Member #: 1074 Advanced Member Northamptonshire |
19th Aug, 2008 at 10:14:54am
Not sure what you mean by 'spikes'.
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115 Posts Member #: 2830 Advanced Member Costa del Northern Ireland :) |
19th Aug, 2008 at 09:08:01pm
forgot to read in distructions That mini is determined to Kill me!!!! |
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 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
19th Aug, 2008 at 09:12:11pm
I would suggest getting a PCMIA to 232 card, i got one for half the price i paid for a usb cable and it seems much more reliable.
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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115 Posts Member #: 2830 Advanced Member Costa del Northern Ireland :) |
19th Aug, 2008 at 09:54:07pm
aah i see cheers for that :) im not a very computer person for a mechatronic engineer ha ha That mini is determined to Kill me!!!! |
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189 Posts Member #: 1774 Advanced Member Sydney AUS |
20th Aug, 2008 at 02:27:17pm
On 19th Aug, 2008 matnrach said:
Not sure what you mean by 'spikes'. When the sensor is in such a position so as it will not see exhaust leaks or be too close to the end of the pipe then when calibrated correctly will give very good results. 'Spikes' can occur on rapid tranisents but these are very real. If you map too close to lambda 1.0 then a rapid transient will push the average lambda well over 1.0 causing some hesitations. With correct transient fuelling multipliers these can be minimised so that the response can be very good indeed. It takes some experimenting but the results are worth it. Thats actually what I meant, depending where its reading from, etc. Mine was reading fine, but hitting full throttle or completely backing off things would go haywire. There was a leak between dump pipe and the exhaust, which made the lambda a little off. Also there was not enough flow in idle for it to read right, it was reading 19+ on the A/F on idle, which was completely wrong, giving it another 200rpm by pressing the pedal and it all settled down and sat on 12.7 A/F The dyno op also said there are a few factors which can throw them out. Dont get me wrong, anything I change, I got and check the A/F with the lambda, just pointing out that they can give some odd results sometimes if not setup 100% right. I know cars like the GTR's have the o2 sensor in the turbo itself for the computer to adjust to... and we usually stick our in the tailpipe... so any leak at all comes up as a wrong (or slightly off reading) Pete Peter 1132cc Turbo ~120 bananas ATW - Fun Fun Fun
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