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Low Ignition Timing

fmlycar

By fmlycar,
in Engines & Forced Induction

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hypergear Grand Master

hypergear

Posted
Posted

It's a 1500km (Adelaide to Alice Springs) drive to get back to him so I will just have to live with it for the time being. I will check and dress the dump and just get a 3.5 inch exhaust made to be certain I can rule that out.

I was told it was pinging so he got out of it straight away.

Should have done a run with exhaust dropped before the cat.

This is important, the exhaust side restriction on this turbo can affect your boost level and afr by lot. Usually once a free flow system is installed, it will be creeping boost using your current EBC settings and make your AFR run lean. In your case I will be getting my self a wide band gauge and touch up the fuel on WTO after the dump pipe is checked with new exhaust installed.

Also plug your boost gauge before the cooler and compare pressure differences to the graph.

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Ben C34
Ben C34

Good jokes rely on timing

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STATUS

Tap a fitting into ex manifold and measure the pressure, i bet its crazy high

t_revz
t_revz

For reference I have an Hypergear SS2, standard manifold opened up and port matched, bell mouth dump opened up and port matched as close as possible, 200cell cat and 2 straight through mufflers in 3 i

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

I agree too lean, on 98RON especially at peak torque you want it rich.. nearly pig rich to keep it cooler.

When I work with 98, I drop it down to 11.5afr even richer depending on how small the turbo is. Larger turbos "breathe" better so there is a lower chance of knocking.

Before you start doing anything silly, how's your timing belt? best to take off the cover and turn your crank to TDC and see if everything is aligned correctly.

fmlycar Proficient

fmlycar

Posted
  • Author
Posted

Timing belt hasn't been touched and never had an issue with last tune 12 months ago. Now has bigger turbo that should breathe alot better so maybe the exhaust is now a restriction. I will see what I can do to fatten it up in peak torque and at wot

XGTRX Veteran

XGTRX

Posted
Posted

Ha ha, love the workshop name.

I agree with the others though, that AFR graph looks a bit scary. Like the red one better.

I would be adding 10% more fuel across the board and then check the AFRs in the meantime mate just to keep things safe

mr_rbman Grand Master

mr_rbman

Posted
Posted

Ha ha, love the workshop name.

I agree with the others though, that AFR graph looks a bit scary. Like the red one better.

I would be adding 10% more fuel across the board and then check the AFRs in the meantime mate just to keep things safe

I thought the general rule of thumb was 15:1 on cruise and 12:1 @ WOT?!

I realise different applications this would vary but the redline appears to be almost 10:1..........quite rich!?

Dan_J Veteran

Dan_J

Posted
Posted (edited)

Petrol tunes running afr of 12.0 flat is too lean id fatten that up at 20psi even more so if your trying to add more timing and there is inefficiencies in the system.

do most tuners really run 10.1-11.1 for the final tune at WOT?

seems a bit too rich, i can understand running that rich to iron out the lean spots and then bumping up the afr to 11-12 at WOT for the final tune

Edited by Dan_J
fmlycar Proficient

fmlycar

Posted
  • Author
Posted

According to the tuner my wideband gauge reads leaner than his from the dyno.

Was looking at ign timing on the power fc at idle and it's showing 10 deg but I could've sworn my cas was set at 20 deg and it was marked and doesn't appear to have been moved.

mr skidz Veteran

mr skidz

Posted
Posted (edited)

If the idle ignition timing was initially in the ECU at 20* you want to set your base timing at 20* so obviously the ecu's adjustments are directly related to what is really happening at the crank angle he may have put it down to 10* while tuning.

Which means he has 10 degrees less timing @ idle.

Edited by mr skidz
Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

Yeah it was idling high so the timing was pulled back to rectify that. I'm not about to adjust the cas as it was tuned for where it's at now.

ehh... wtf? come on man, if your tuna is doing that.. I would have many questions to ask.

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