how do your logs look after warmer weather?

[MitsuBoost]

Well around Feb-Mar (60 degrees) i was tuning & logging and i got my logs looking pretty damn good, but now with the 80+ degree weather i cant seem to get rid of this mid range knock even with an FMIC.. is 17psi simply too much for 91 octane above 80 degrees? My O2 voltages are already around .97-1.0V throughout, it pulls 1-2 degrees of timing at a couple points between 4K-5.5K RPMs but i want it PERFECT!!! Am i asking for too much?

MODS:
14B @ 17psi
JRC fmic
Walbro 190
2.5 /3" turboback
1g bov
BPR7ES plugs


stock 450cc injectors

 

[CanadianTSi]

I would try logging your intake temps, they might be too high and you could benefit from some ducting.

 

[1SloColt]

If the car isn't lowered too much a Jason Bonner motorsports cold air intake might cure all your knock problems

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J/k, but seriously, it might help your intake temps some. I have no problems running 24psi on pump gas in 60-70 degree weather and I run a shit ton of timing when boost comes in also cause I'm so far off the map.

 

[tstkl]

to answer the question asked in the thread title directly:

just as shitty as they did in the winter. In all seriousness, getting some colder air to your air filter or more air to your intercooler would help. You should think about some simple mods such as the air scoop for the 2g's (this is a 1g but whatever)

http://vfaq.com/mods/1G_cold_air_box.html

or those holes in your front bumper like user artictsi has in his car.

water injection would be kinda be the solve all expensive lets see you knock now solution, but then again, your talking about a couple hundered. Maybe I'll design something cheaper that involves a valve that can be controlled by boost. that would be interesting.

 

[Byrd]

Depending on what kind of setup you have. This cost me $25 at home depot and dropped my intake temps 50+ degrees. Let me know if you want a how-to and parts list.

1g w/ a 2g mas.

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Isn't .97-1V pretty damn rich? Possibly knocking because of that? Water injection is my next mod to combat knocking.

 

[tstkl]

I didn't even notice that the first time around, seriously, take out about 15% and see where that leaves you, your o2 voltage should be around .83-.87, but DO NOT use it as a tuning device religiously. ALL narrowband o2 sensors are slightly different, but .97-1.0 volts is WAY too rich. Lean it out and watch knock like you currently are. You will probably pick up a LOT more power by leaning it out.

 

[CanadianTSi]

I didn't even notice that the first time around, seriously, take out about 15% and see where that leaves you, your o2 voltage should be around .83-.87, but DO NOT use it as a tuning device religiously. ALL narrowband o2 sensors are slightly different, but .97-1.0 volts is WAY too rich. Lean it out and watch knock like you currently are. You will probably pick up a LOT more power by leaning it out.

2g's tend to be happy around .94-.96, unlike 1g's which like mid 80's...

 

[tstkl]

that could have turned out really, really bad

 

[MitsuBoost]

yeah i was originally around .93-.95V, i richened to .97 and it helped a lot thats why i thought i was going in the right direction. Im thinking 91 octane is just not good enough for this setup, ill try lowering the boost 1psi at a time

 

[spyderturbo007]

I didn't even notice that the first time around, seriously, take out about 15% and see where that leaves you, your o2 voltage should be around .83-.87, but DO NOT use it as a tuning device religiously. ALL narrowband o2 sensors are slightly different, but .97-1.0 volts is WAY too rich. Lean it out and watch knock like you currently are. You will probably pick up a LOT more power by leaning it out.

WTF

If I am reading this post correctly , please do not listen to anything that tstkl said.

1. Taking out 15% fuel when running stock injectors is suicide. That is way too lean. You never want to change your settings by more than 2 or 3% at a time. Except for the initial compensation when you change injector size, which doesn't apply here as he is running the stock injectors.

2. Do not using the O2 voltage to tune with. The only thing it's really good for is a "guideline". But even then, it's pretty much worthless. The only way to tune properly is by looking at a log. How can you tell him that it's too rich at 0.97V when you haven't even see a log.

tstkl, please do not post things like this when you obviously have no idea what you are talking about. Someone could seriously damage their vehicle by removing 15% fuel while running stock 450's.

This not ment as a personal attack, so please don't take it that way.

yeah i was originally around .93-.95V, i richened to .97 and it helped a lot thats why i thought i was going in the right direction. Im thinking 91 octane is just not good enough for this setup, ill try lowering the boost 1psi at a time

I would leave everything how it is until you post a log. Log timing, rpm, airflow and O2 voltage (if you want). What is your plug gap? Where did you set your TPS trigger points? Did you verify that your TPS is reading >95% at WOT? Results of a leak test? What are your individual Ne points and their corresponding correction factors?

 

[tstkl]

its a good thing you read ALL of my post. I personally have 30% taken out with stock injectors, and I have my maft set for 520cc injectors. Every car runs differently, and running the maft in blow through makes things really screwy. On a 1g if you are running .97 volts, your running rich, to say the very, VERY least. I did not know that the 2g narrowband sensor is different, and that point was already made. If you didn't notice I too mentioned that the stock narrowband o2 sensor should not be used as a tuning device as well. The only thing I said that was wrong was because I did not know that the 2g sensor was so different.

 

[spyderturbo007]

its a good thing you read ALL of my post. I personally have 30% taken out with stock injectors, and I have my maft set for 520cc injectors. Every car runs differently, and running the maft in blow through makes things really screwy. On a 1g if you are running .97 volts, your running rich, to say the very, VERY least. I did not know that the 2g narrowband sensor is different, and that point was already made. If you didn't notice I too mentioned that the stock narrowband o2 sensor should not be used as a tuning device as well. The only thing I said that was wrong was because I did not know that the 2g sensor was so different.

You can take out 30% airflow on stock injectors if you want, but it's your car, not mine. The factory AFR is 9.5:1. Most people tune for about 11.1:1 - 11.3:1 AFR (Pump Gas). Taking out 30% on a SAFC-II would most likely put you in the 12.8:1 AFR range. That is not where you want to be.

You are also contradicting yourself. On one hand you say that if you are running 0.97V on the O2 that you are rich, then in the next sentence you are saying that the O2 sensor should not be used as a tuning device.

I'm not trying to start a fight, but telling someone to take out 15% airflow on stock injectors all at once is asking for trouble.

 

[tstkl]

Im saying the stock narrowband o2 sensor should be used like a fuzzy picture, it just gives you a basic idea as to what you are running and you should use it cautiously at your own risk. thats what I've been saying the whole time. As for trying to pin down an exact number for my air fuel ratio, my wideband o2 sensor doesn't agree with you.... Im running like 10.5:1 afr. I didn't mention I bumped my base fuel pressure up to 46 psi, but you also didn't read "putting the maf in blow through makes things screwy". I took out 30% to make my car run normally, and like I said earlier, every car runs differently. I cannot stress that enough. .97 volts is VERY RICH for A 1G. That is the key to everything I have, and am saying. I didn't know a 2g runs such high voltage for stoichiatric (sp?) and so thats why I told him to take out a lot of fuel. Back when I first installed my gm maf and maft, I had to take out 20% because I was running .93 volts, and for a 1g thats really rich. My car afterwords didn't have any knock and was running at about .85 volts. I took out another 5% and got it down to .83 volts with no knock. That was on a 1g, and with the maft, you can only take out 5% at a time unless your using rpm mode.