What kind of timing can you run at 33-40 psi?How do you figure these out if you were dumb or learning?

 

depends on the fuel.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">depends on the fuel.</TD></TR></TABLE>C16

 

read the plug and watch egt's.

 

Depends on ems, fuel, rpm, ve, iat, ect, what turbo, what cams, what compression etc...

You can't just ask a general question such as the one you have & get a direct answer. The answer is in the tuning :-)

 

Sooooooooo many variables. Complete setup, fuel, management, etc. &lt;sarcasm&gt;You could just start at 50* and work your way down &lt;/sarcasm&gt;

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">depends on the fuel.</TD></TR></TABLE>

and ENGINE.

 

So no real answers there has to be some way to know where to start is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1junkycivic &raquo;</TD></TR><TR><TD CLASS="quote">So no real answers there has to be some way to know where to start is.</TD></TR></TABLE>

Sure, start low and work up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SovXietday &raquo;</TD></TR><TR><TD CLASS="quote">

Sure, start low and work up.</TD></TR></TABLE>Still more factless answers.Why?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpha &raquo;</TD></TR><TR><TD CLASS="quote">You could just start at 50* and work your way down</TD></TR></TABLE>

Honestly bro. Tune it on pump gas. Throw in race gas. Start throwing timing at it. A few of us learned this all on our own. You gave us absolutely NO details on anything

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpha &raquo;</TD></TR><TR><TD CLASS="quote">

Honestly bro. Tune it on pump gas. Throw in race gas. Start throwing timing at it. A few of us learned this all on our own. You gave us absolutely NO details on anything</TD></TR></TABLE>The question asked seems pretty simple if you had a answer what kind of timing is being used in boost levels 33-40 psi in general?No one has specific cause there is always variables I know these.Every tuner is different some are more aggressive tunes than others.

 

my setup runs 28* @ 35lbs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by miller &raquo;</TD></TR><TR><TD CLASS="quote">my setup runs 28* @ 35lbs.</TD></TR></TABLE>
mine is around 20

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by miller &raquo;</TD></TR><TR><TD CLASS="quote">my setup runs 28* @ 35lbs.</TD></TR></TABLE>VP import for gas or BS?<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbotypeR@SPEC &raquo;</TD></TR><TR><TD CLASS="quote">
mine is around 20</TD></TR></TABLE>It is or isnt?That like saying your car is like blue.

 

Timing is something that people try to keep secret and you wont get a straight answer.

Like was said before start low, watch egt's, read plugs and test test test.

 

my total timing is 12 degrees at 24psi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1junkycivic &raquo;</TD></TR><TR><TD CLASS="quote">VP import for gas or BS?It is or isnt?That like saying your car is like blue.</TD></TR></TABLE>
what do you mean? i was saying that my timing at about 35psi is around 20 deg

 

There are so many varibles on timing for us to just say what timing we are running at 35-40 psi.

Fuel
Bore size
Rod ratio
Compression ratio
Cams = dynamic compression ratio
Combustion chamber design
Piston design (domed, sharp edges or smooth flat tops) Off the shelf un-modified pistons need to be worked over a bit.


I am running a 84x89 engine, the pistons crowns are a coated, very smooth and flat design piston with a great combustion chamber.

At 40psi, I run 17 degrees at peak VE (6000rpm-7500rpm) and timing is smoothly increased (as VE starts to drop) to 22 degrees by 11,000rpm. Timing advance is also needed as engine speeds increase because piston velocity (depending on stroke) can out speed the flame speed.

You will need to find what your setup likes and doesn't like.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1junkycivic &raquo;</TD></TR><TR><TD CLASS="quote">Still more factless answers.Why?</TD></TR></TABLE>


Seriously, the answer below is probably the best advice you can use right now. Every tuner will always start low and work their way up.

If you want a more specific answer, keep working up the timing until you see smoke out of the exhaust

That's why you need experience and lots of dyno and tuning time to "work you way up" with big power, big boost and a good tune.

I can have an engine, with identical motor, cams, turbo, fuel system, and type of fuel, and a simple change in exhaust housing size can already offset optimum timing +/- 2-3 deg easily from being safe and aggressive. You can't ask questions like this and expect to get anything useful. You are better off praying that someone here on the forum is running the EXACT same setup as yours and lives 2 houses down from you, and uses the same dyno you go to, AND with the guy willing to share his fuel and ignition tables that has just been tuned by a professional with his car running over a year with multiple track passes to prove the tune is a good one.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SovXietday &raquo;</TD></TR><TR><TD CLASS="quote">

Sure, start low and work up.</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by uglyasscivic &raquo;</TD></TR><TR><TD CLASS="quote">There are so many varibles on timing for us to just say what timing we are running at 35-40 psi.

Fuel
Bore size
Rod ratio
Compression ratio
Cams = dynamic compression ratio
Combustion chamber design
Piston design (domed, sharp edges or smooth flat tops) Off the shelf un-modified pistons need to be worked over a bit.


I am running a 84x89 engine, the pistons crowns are a coated, very smooth and flat design piston with a great combustion chamber.

At 40psi, I run 17 degrees at peak VE (6000rpm-7500rpm) and timing is smoothly increased (as VE starts to drop) to 22 degrees by 11,000rpm. Timing advance is also needed as engine speeds increase because piston velocity (depending on stroke) can out speed the flame speed.

You will need to find what your setup likes and doesn't like.

</TD></TR></TABLE>Well done. this is more likely the answer you are looking for. Can't be better than this.