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Home > Technical Chat > Running rich

TurboTim

13 Posts
Member #: 12041
Member

6th Mar, 2021 at 03:18:56pm

So I’ve finally got my engine up and running, 1310cc 8.1 compression ratio, intercooled, bdd needle, green spring, 20wt oil, part lean off blocked. Now anything more than 30% throttle and goes straight to 8.0afr. Only running 7psi boost as I run it in, and not really reving it past 4K. But any ideas why it’s so rich? It’s perfect at idle and minimal throttle.

stevieturbo

3574 Posts
Member #: 655
Post Whore

Northern Ireland

6th Mar, 2021 at 06:48:57pm

wrong needle, wrong dashpot spring, wrong something, blocked air filter

Or a wrong wideband....many widebands don't even offer much below 10AFR, so if it's stating 8.0 ( It must be running terribly at that ? ), it's probably even richer.

Is the dashpot able to move freely ?

Is fuel pressure ok ? not overcoming the needle/float valve ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


TurboTim

13 Posts
Member #: 12041
Member

6th Mar, 2021 at 07:18:34pm

May have found a small air leak at the plenum. To be honest it pulls fine when it comes in boost so may be a wrong reading on the wideband? There is also no smoke when it does boost and reads rich.
Dashpot moves freely. What would be a leaner needle from a BDD to try and work from?


hazpalmer

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1648 Posts
Member #: 9038
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Carlisle, Cumbria

6th Mar, 2021 at 08:24:35pm

On 6th Mar, 2021 TurboTim said:
May have found a small air leak at the plenum. To be honest it pulls fine when it comes in boost so may be a wrong reading on the wideband? There is also no smoke when it does boost and reads rich.
Dashpot moves freely. What would be a leaner needle from a BDD to try and work from?


Use the minty lamb su site to compare needles. BDD is standard metro turbo needle so I don't see how it can be so rich all the time. The air leak would probably make it run lean rather then rich
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