lean cut in 3rd gear...

[kornsined]

Lean cut in thrid....
I'm getting lean cut in 3rd gear when entering boosting part throttle then punching it to full boost. It's happened 3 times all in third and only 3rd gear. The temp has dropped in the area last couple of weeks. I'm also ... so i'm not sure if that's contributing to the problem. My setup specs are 2004 Civic EX Coupe w/K20a3 RSX spec, Greddy turbo kit w/FMIC, Apexi WS II Turbo muffler, 3" ... mandrel exhaust, 650cc.

Lean protection settings are as follows:

Protection 1
14.2:1
over 3 inches
250ms

Protection 2
12.5
Over 1.9psi
100ms

Any advise is greatly appreciated.

[Razathorn]

Protection 2
12.5
Over 1.9psi
100ms

Any advise is greatly appreciated.

Protection 2 is far to agressive. Realize that column 10 is probably tuned in the high 12s to low 13s and the 4psi column is tuned around 11.5...

Try raising the boost on protection 2 and increasing the miliseconds... I run like 12.5 a/f over 3psi for 200ms.

Wayne

[kornsined]

Thank you Razathorn. finally got a lean cut in 5th. so i'm thinking it's improper temp comp settings.

they are as follows
light & idle -22 32 86 175 208
11 5.0 0.0 -6.0 -8.0

Med & heavy -22 32 86 175 208
11.7 5.1 -0.1 -6.8 -8.9


i'll try changing the lean protection 2 settings.

[Razathorn]

Thank you Razathorn. finally got a lean cut in 5th. so i'm thinking it's improper temp comp settings.

they are as follows
light & idle -22 32 86 175 208
11 5.0 0.0 -6.0 -8.0

Med & heavy -22 32 86 175 208
11.7 5.1 -0.1 -6.8 -8.9


i'll try changing the lean protection 2 settings.

If you're going to change the compensation tables, you're going to need to re tune a good chunk of your a/f. I can't tell you if that is WHY you are going lean -- all I can say is that what you had for lean protection was a little agressive if you're experiencing cuts right when you get on it. I generally use the compensation tables from the coldair calibration. I don't know how well the others work to be honest with you.

[kornsined]

I actually was using conrad's air temperature compensation calculator, http://forums.clubrsx.com/showthread.php?t=204865 Although I made a mistake on the tune temp to figure out the proper values. I used the air temp outside the car instead of the IAT. The correction bumped up the compensation values.

Either way I adjusted the protection to your recommendation as well as the new temp comp values I got. Went for a quick datalog/test and no cut. Hopefully this will correct the issue. The a/f stays 11.5 - 11.8 through full boost consistently. I think you were right about column 10. I think it triggered my lean cut with the previous setting.

[TransformedBG]

so you think my lean protection is a little to agressive to?

Lean protection 1:
maximum lambda 14:2:1
Engine load is over 3 inches
Trigger time 250ms

Lean protection 2:
maximum lambda 13:6:1
Engine load is over 2.9 psi
Trigger time 250ms

I get wierd random lean cut out in every gear just on certian occations not all the time.

[Razathorn]

so you think my lean protection is a little to agressive to?

Lean protection 1:
maximum lambda 14:2:1
Engine load is over 3 inches
Trigger time 250ms

Lean protection 2:
maximum lambda 13:6:1
Engine load is over 2.9 psi
Trigger time 250ms

I get wierd random lean cut out in every gear just on certian occations not all the time.

Personally, I consider yours not agressive enough. I'd leave it at around 12.5 or 13 at most.

Wayne

[kornsined]

^^^I was thinking the same. Is there any consistency to when you get the cut? Temp is colder, certain actions, anything that you could narrow it down to. It sounds weird for a s/c engine to be hitting that high of an a/f ratio.

[TransformedBG]

^^^I was thinking the same. Is there any consistency to when you get the cut? Temp is colder, certain actions, anything that you could narrow it down to. It sounds weird for a s/c engine to be hitting that high of an a/f ratio.

Remember im a 11:5:1 compresion engine thats supercharged. so i dont know how much of a role that plays.. But I havent quite figured out when it cuts out. I know that if i get less than a qaurter of a tank it does it more, but thats only because of the return set up im using *figured that much out*.. But its like some time ill just step on it, it will do a brief acceleration and then if it will start loosing power even though my foot is on the gas.. So i shift up, and it goes away. Usually in 1st or 2nd. Is when i notice it the most. Its been summer time and i tuned the car in about 78 degree weather in cali, here its been up in the 90's to 100's and it was tuned on 91 vs 93 octane here. So i know my A/f is a little out of wack and need to do a little correction to it. But im still wondering about the cut out part.

[Razathorn]

Sounds like there might be a problem with the intank pump and how it's attached to the pickup filter.

[TransformedBG]

Sounds like there might be a problem with the intank pump and how it's attached to the pickup filter.

Well its just a common problem ive already played with it, and its better for the pick up of fuel, But no matter what i do below 1/4 of a tank it still likes to cut out sometimes... *thinking about drilling a whole in my tank and tapping it so i can use gravity to feed the pump* but no, thats not the problem for my everday thing. Cause it will still cut out sometimes when i have a full tank of gas.

[kornsined]

Well i had my 3rd gear cut again but my alternator is toast. I'll have to get that fixed before I can diagnose any problems.

[kornsined]

Fixed my alternator.

Happened to be doing a datalog when I got another lean cut. Checked out the a/f and I'm hitting 12.3 ish. Must be the cooler weather because this happened late evening. My IAT was about 88.

[Razathorn]

I'd seriously just try using the temperature compensation tables from the cold air calibration, retuning fuel, and seeing if the problem comes back. Also that with cooler air usually comes less humidity and the ecu cannot correct for humidity -- if I tune on a warm humid day, I always tune richer as I know it will lean out a bit when it drys out.

[kornsined]

Quick question RAZATHORN:

My original KAL that was tuned on the dyno showed the type-s gear ratios. I changed it to the correct RSX base one. Is that only for datalogging to make sure it properly shows which gear i'm in? Or does it in fact effect the tune in a way?

EDIT: ok after doing some reading and searching, I'm starting to think i'm overboosting. I did say this was originally from partial throttle to WOT. As this happens the boost guage flutters at just over 10psi. The stock MAP sensor is good to 10.5psi according to Hondata so i'm not seeing how high it's really spiking. I think this spike is the really lean and causes the cut.

Now if this makes sense to you guys how do I get the boost to go no higher then 10psi? Boost controller? or go for a 3 bar MAP sensor that can read higher boost?