I'm helping a buddy out on his h22 turbo project. The wideband still shows no higher then 14.0 and averages at 13.5 so i know we have to add some more fuel. Do you think that would make the line on the ground strap more towards the bend with an A/F of around 12.5? turbo at 6psi and timing is retarded 5º under boost

Here is a cut of a 3rd gear WOT on the street.


The line is where Vtec engages. Now here is another question, on the chart at about 6000rpm where the fuel curve starts to richen, the car feels like it about stops pulling up untill redline. What could be done to fix this. So far on the computer i added more fuel up to 6000 to bring it to around 12.5 and then after 6k i took away a bit of fuel to lean it out to close to 12.5.

Opinions?

 

Wow, at 14AFR at 5,000 rpm seems a little LEAN.

Richen things up a bit. I rather have a little darker plugs then white.

 

^^^ I agree

 

ok yea in the new fuel map i just finished doing, i made those fuel adjustments, but we havn't done another run yet.

What do you think of the ground strap? Do you think that the line will be more towards the bend with the fuel richened?

 

the groudn strap is a good indicator of timing. if you have too much timing itll near the end of the strap towards the spark plug .


think of a spoon that you heat up, it starts off at the tip and when it gets too hot itll get redder and redder towards your hand.

back off the timing a little more.

 

so richening the fuel from its above state will not cool off combustion a bit so i wouldn't have to pull timing?

What is your opinion on that 6000rpm bog?

 

you shoudl be aroudn 12:1 not 12.5

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">back off the timing a little more. </TD></TR></TABLE>

Or if you hadn't already, go to a plug that is 1 step colder than stock.
The ground strap has to do with timing/heat range... you want that line to be around halfway up the strap...

 

read this and you'll see your plugs are not correctly burning. I'm gonna have to agree with project dc2 on the timing. I think it's too much timing and too much fuel since it's not burning correctly. What are you AFR is partial throttle and when did you take out the plugs? You know you have to do a pull and cut off the ignition when in high rpms so the idling of the engine doesn't ruin the sprak plufg reading...get it .

 

^^ Great article ^^ very good info

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nuclearhappines &raquo;</TD></TR><TR><TD CLASS="quote">Or if you hadn't already, go to a plug that is 1 step colder than stock.
The ground strap has to do with timing/heat range... you want that line to be around halfway up the strap...</TD></TR></TABLE>
Already running 2 steps colder.

I have read that article, very informative, but why is my porcelain black accept up to the tip? I did drive home on it a short distance so i am thinking that might be why its black. I am using my wideband to tune my a/f ratios, so i am not to worried about the reading the plugs for fuel. I am reading the plugs for timing though.

So here is my question. I know if i pull some timing out, that the "line" on the strap will move towards the tip, perferably towards the bend, BUT since the car is still running lean, if i add more fuel to get the a/f ratios right will the "line" on the strap move more towards the tip where it is suppose to be without having to pull timing? I draw this conclusion because with adding more fuel, you would be cooling combustion down some, but is that enough to move that line where it is suppose to be?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Qveon &raquo;</TD></TR><TR><TD CLASS="quote">
Already running 2 steps colder.
</TD></TR></TABLE>

that may be your problem....run a 7 series gapped at about .030 and see how that turns out.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Qveon &raquo;</TD></TR><TR><TD CLASS="quote">
I have read that article, very informative, but why is my porcelain black accept up to the tip? I did drive home on it a short distance so i am thinking that might be why its black.</TD></TR></TABLE>

yep and that also means your partial throttle is too rich. Like I said do a pull and shut down in the higher rpms


Don't read plugs for timing.....the only thing is a dyno, the plugs just compliment a dyno tune. Run .9 degree retard per PSI then fix your AF's. Once that is done then you can mess with timing a little, but don't base it off plugs only like I was saying because by the time you see something on plugs it's too late . GL

 

Can you explain how and what gap effects? And what are the effects of a 7-range @ .030 would be over an 8-range @ .028


Modified by Qveon at 5:56 AM 6/20/2005

 

bump for morning crew.

 

the closer the gap the harder it is for the boost to blow out the spark. The further the gap is with out it breaking up the better. 30 is pretty good place to start. I don't see why he needs to pull 5 degrees of timing for 5 psi of boost. That is pretty conservative.