First Log on the new FMIC

[assa 98gsx]

I had a leaky fmic and replaced it with the SBR kit. Now I lowered the boost to 15 psi and retune my car, the timing seems to be very off. I used to be able to get around 18 degree timing advanced.. now, I can only achieve 14* on the second gear pull. My mods are FP big16G, 550cc injectors, safcii, 14.5psi, 3" turbo back, and the SBR fmic

Here is the log, please let me know what you think. The o2 seems to be on the rich side but I don't want to tune by O2. It drops down to around 6 and raise only up to 14* on a second gear pull. Fuel trims are all fine and my hi points are -20 across the board on the SAFCii.

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[Ronin17]

Have you tried leaning it out any, or better yet up the boost a couple psi and then log another run? Looks like you have plenty of room to run more boost.

 

[rowlex]

I'd lean it out a bit in the "blue" rpm band where your timing should continue to climb. You can get knock from running overly rich as well.

 

[assa 98gsx]

I didn't lean it all the way out or up the boost because I didn't wanna do anything to the engine before I figure wether if the car is running too lean or too rich. I didn't understand why would the car be knocking enough tho I had plenty of fuel, but I will give it a shot tomorrow and report in the result. And why the timing dropped so low when the boost hit?

 

[fwdturbobov1996]

your probably knocking ... . 2nd gear pull ? I thought it was supposed to be third gear.

 

[Blk_99gst]

I didn't lean it all the way out or up the boost because I didn't wanna do anything to the engine before I figure wether if the car is running too lean or too rich.

Your car is running REALLY rich. You have a good setup; all the right fuel mods, turbo and a nice fmic. You need to turn the boost up to 18 or 19psi, and will still probably need to lean things out after that. But do one thing at a time. Keep the same settings, and up the boost.

I didn't understand why would the car be knocking enough tho I had plenty of fuel,

Why do you think your car is knocking? Because you ended at 14degs of advance instead of 18deg? The log looks good, no knock, but rich as hell. The thing is if you lean out the safc settings, the ecu will see less airflow, and give you more timing advance. So you'll make more power because of a leaner mix, and you'll make more power due to the increase in timing advance.

And why the timing dropped so low when the boost hit?

I'm sorry, but if you're asking this question, then you need to read a little bit more about how to tune are cars and what they do under boost. It's a rule of them that when you floor it and boost hits, the ecu freaks out and pulls timing down to about 8degs, give or take. Then it was steadily advance timing as long as it does not see knock. So when you see timing drop when boost hits, that's normal.

 

[assa 98gsx]

I did the pull on an industrial road, so no 3 gear pull. It's on 1st and 2nd gear.

 

[markgholland]

02s are not ideal to tune with, but they do give you an idea of where your tune is. If you are seeing 02s of 1.0, you are rich.
~Mark

 

[CanadianTSi]

Turn up the boost, that would be the easiest way to get rid of your super rich condition

 

[markgholland]

I concur

 

[PropXprt]

I feel akward asking questions in other's threads, (second time this week, and I know some people get very pissy) but I am trying to better understand the basics of datlogging and tuning. My question is should the timing on a 1g should drop to 9 degrees when the boost comes in like above log and what I have read before about a 2g. I just haven't read anything with mention to the timing doing that on a 1g.

 

[assa 98gsx]

I had tuned my friend's 1g before and the timing was never dropped below 10.. I turned up the boost a little bit, around 16psi. The car felt faster but I had no chance to tune the car. I will post another log tomorrow when I get a chance to log. Thanks for the inputs.

 

[assa 98gsx]

Okay, I've done some more 2nd and 3rd gear pull today. I started to get boost creep up to 20psi at the end of each gear. The first log is a second gear pull. Timing and everything looks smooth. These are done at -20 all across and the boost from 15psi to 20psi.

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And this next one is on a 3rd gear pull. Exact same tune, the outcome is drastically different. Can anyone help me figure out why the 3gear knocks? Also go from 15psi creeps to 20psi. thank you.

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