LSJ Tuning Woes

[Gtstorey]

I definitely agree on checking the boost solenoid. I see no sign that it’s in limp mode. I agree the air tables are likely off.

i did see that you map sensor and baro where the same on one of your earlier logs with key on and not running, so your map sensor likely has the correct data.

Are both of you running the same DF stock intercooler setup? Both running the fan? Ghostknife’s got a much larger difference in iat and iat2. Maybe the intercooler pump isn’t working?

 

[Ghostknife]

while I’m at work I’m going to use some brake kleen to spray around the injectors to see if the idle changes.

 

[Ghostknife]

I definitely agree on checking the boost solenoid. I see no sign that it’s in limp mode. I agree the air tables are likely off.

i did see that you map sensor and baro where the same on one of your earlier logs with key on and not running, so your map sensor likely has the correct data.

Are both of you running the same DF stock intercooler setup? Both running the fan? Ghostknife’s got a much larger difference in iat and iat2. Maybe the intercooler pump isn’t working?

I have the dual pass set up and I can visually see the flow through mine. I should make sure my fan is running though.

 

[baustin]

I have the DF heat exchanger up in the front, no fan on it, just the naca ducts through the hood sides to feed air to it, no dual pass, just the stock intercooler setup.

Only fan up front for mine is the main radiator one but the naca duct setup separates my heat exchanger from the radiator heat pretty well. Coolant lines to the intercooler are run through the tunnel.

 

[Ghostknife]

It looks like there are at least some tables that you didn't copy over, I see your first gear BCS still was targeting 75% whereas my tune has that at 85%. If only some tables were updated, it could be causing odd behaviors.

This is a screenshot of your data log:
View attachment 35079

Here's a similar screenshot from a recent data log I did:
View attachment 35080

I don't know what your foot was doing but it looks like there is a lot of bouncing in the throttle trace which comes from the accelerator position being all over the place. Your injector DC % and INJ B1 (ms) values are far lower than mine at that similar time and this is during open loop with AFR target of 11.3, yet your open loop fuel tables were essentially identical to mine. That must mean your air tables are off if it thought it only needed a small amount of fuel to hit 11.3.

Not sure if you provided this detail and I probably forgot to list it, what octane fuel are you using? My tune is for 93.

Other basic questions you may have covered but are worth asking:
are you sure you don't have any intake path leaks?
do you have all of the intake paths connected or plugged?
have you tested your boost control solenoid to see if it functions (this bypass valve with 2 hoses that rot away, youtube link to test it)? if it's actually opening all the time then you'll have a massive boost leak and limited to low boost and I would expect misfires from wrong air calcs

Looking through my tune compared to yours, the Max Boost and the COT Boost were the only thing i didnt change. COT was already at 100% and my Max was 75 vs 85.

 

[baustin]

Ah, then that no impact with only those being different.

I'd definitely look closely at the bypass valve and the control solenoid to make sure they are doing as expected, like the video I linked before. From my glancing last night, you can test the valve and electrically test the solenoid if the valve checks fine. But you could probably also pinch 1 of the lines to block it and prevent the boost leak of that also the problem but it's best to not leave it like that for long term.

 

[Ghostknife]

Ah, then that no impact with only those being different.

I'd definitely look closely at the bypass valve and the control solenoid to make sure they are doing as expected, like the video I linked before. From my glancing last night, you can test the valve and electrically test the solenoid if the valve checks fine. But you could probably also pinch 1 of the lines to block it and prevent the boost leak of that also the porroblem but it's best to not leave it like that for long term.

I’ll just pull it off to get full boost for the cruise tonight, BIG SMOKEY BURNOUTS!!

 

[baustin]

Have you had any chance to test the boost solenoid or control valve?

 

[Ghostknife]

Have you had any chance to test the boost solenoid or control valve?

I’ve been out of town for a bit and busy celebrating my birthday lol. I’ll have a chance to check it tomorrow. I have the boost actuator disconnected from the solenoid to see what happens to the boost. I will be driving it to the gym in the am.

 

[Ghostknife]

Took the long way to the gym this morning, like I stated, pulled the bottom line off of the actuator and put a bolt in the line to the solenoid. HOLY BOOST! Think the gauge hit 15psi but I was watching the road lol. No Check Engine lights popped up

 

[Ghostknife]

So I replaced the solenoid with a new one and still have a low boost issue when re-connected, took it back apart and I get my boost back. I guessing it is the actuator at this point.

 

[baustin]

Yeah, it's only those 2 parts in that system so that makes it easy.

Full boost really is a lot of horsepower difference vs 3psi... I had a stock pulley maxing at 12psi before going to 2.9" and that alone was a big horsepower difference.

 

[Ghostknife]

Yeah I see what people mean when they say watch second gear when getting on it. My 225s don’t really stand a chance and things get a little sideways

 

[ctuinstra]

I've had my boost solenoid disconnected for the last couple of years. When I took the car in to get it dyno tuned, the tuner saw it fluttering at the very top and disconnected it. I unplugged it and plugged the vacuum port. There are tuning parameters for the bypass, I'll have to see if you posted that earlier in the thread and look at it.

 

[Chubbs]

Reviving an older tread here, because I'm not sure where else to ask.

I'm having some trouble with my LSJ ('07) going full rich on me from time to time. At first I thought it was just my VE tables or MAF being off a bit, so I kept tuning. But the other day I noticed while the AFR went full rich (10.0 on my gauge) that the ECM was actually commanding a 10:1 ratio. It wasn't a mistake in tuning, it was intended to go full rich. This was at about 60mph in 4th gear, around 3000 rpm, just cruising. I should not have been in power enrichment at such a throttle opening, and I don't think that's what has caused it. Note that I was trying to tune the MAF, so I had 02 sensors disabled, fuel cutoff disabled, and commanded it run off the MAF instead of the VE tables.

Does anyone have an idea of what may cause the ECM to command full rich, besides the PE?

Second question (potentially related); I stumbled upon the "Open loop IVT gain" option, see pic. I have not messed with it before, but it appears to be altering the AFR based on temps and MAP pressure, which seems like the kind of thing we want to disable when tuning. Are you guys turning these parameters off while tuning to keep it from messing with your results? I can't remember the Goat rope guy ever addressing this, but it seems relevant, since we are commanding open loop mode.

 

[ctuinstra]

You shouldn't be in Open Loop other than during a cold start and should only last a short time. Upload your full tune and if you have a scan log of the event.

 

[ctuinstra]

I wonder if it was cat protection kicking in for some reason. Especially with the O2 sensors disabled. Just a thought. I see mine command lower than 14.7 from time to time, but not 10. It does it for no real reason, just out of the blue it will command like 12.5 for a short time, and it's not because of throttle or demand.

 

[Chubbs]

You shouldn't be in Open Loop other than during a cold start and should only last a short time. Upload your full tune and if you have a scan log of the event.

Responses like this make me worry that I have a fundamental misunderstanding of what I'm doing. I"m not very good at tuning so far, and think I might be doing something wrong.

I thought we wanted to force open loop while tuning the MAF and VE tables. If the o2 sensors are on, constantly correcting the "wrong" AFR, then how will we know if our AFR is in fact wrong? Or am I misunderstanding that? Am I just supposed to leave the o2 sensors on while trying to log a run?

I've attached the tune. This started out as a tune from the HPTuners repository for a "stage 2" tune, which I thought was close to what my car was (60# injectors, 2.8 pulley, dual pass, zzp headers, and of course the goblin intake). As the tune was, it was WAY too rich.

I believe I have the catalyst protection turned off completely .

I don't have a log file (i've never saved one before). I'll try to get one next time I drive it if the problem shows up.

 

[ctuinstra]

Sorry, I didn't mean to confuse you. I was speaking in the general sense, and later realized that you meant it was happening specifically during a tuning session.

 

[ctuinstra]

You may be able to filter out the commanded 10 AFR data so it doesn't effect your tune data. I wouldn't worry a lot about it unless its happening during a normal tune. It maybe the ECM trying to run a test.