is 19 degree at 16psi too much?
 

i am running 19 total @ 16 psi.
is it a lot?(i assum it is?)

Re:is 19 degree at 16psi too much?
 

What engine? What Octane fuel?

You know better Donald...

I was running nearly 20-22 degrees @ 13psi on my B18a and never heard any pinging. Although, that could be because when my wastegate was open I couldnt hear dick.

Re:is 19 degree at 16psi too much?
 

LOL

D16Z6 9.0:1 srp piston, T3/04e .48ex/.60IN 0 trim.

i`ve ran it like this for almost 3 month but recently Heard a little knocking noise from the engine bay, i am not sure if it is from the motor but it usually happen when i load it at a lower rpm before the needle hits 0 vaccume. it happens kinda quick and the noise would be gone once it start to build pressure.
now i don`t really think it has anything to do with boost coz it`s not even reaching postive pressure yet. and it ran fine all the way to 8500 without any problem.

i tried different gas stations and use octane booster, it helped a little but didn`t completly get rid of it.

Re:is 19 degree at 16psi too much?
 

well, your timing at 16 psi, doesn't really have anything to do with detonation at a lower psi ;) have you messed with the timing maps in vacuum? even so, i wouldn't worry so much about a little detonation in vacuum if that's even what you're hearing. 19° seems a bit much timing, that's only about -.55° per psi, for about 12-15 psi, i usually pull about -.75°

Re:is 19 degree at 16psi too much?
 

yea that`s what i thought. since it`s not lasting for too longm only like a second or so.

a while a ago i kept on hearing the same noise,turns out it is the block cover hitting the timing belt. :-[

Re:is 19 degree at 16psi too much?
 

I have never had a problem with detonation. I was running 19 degrees total timing and I ended up blowing a headgasket running 12psi, but it would spike to 14-15psi everytime I hit full boost (shitty internal WG). I am running 17 degrees of timing now, but I haven't turned the boost back up yet to find out if that helped. D-series motors don't like a lot of timing and I know of two 500+ whp d16z6 motors (TurbodCX and ZEX Man) and they are only running 12 degrees of timing. Read this... http://www.honda-tech.com/zerothread?id=1137540

Re:is 19 degree at 16psi too much?
 

kool...
thankx guys..

Re:is 19 degree at 16psi too much?
 

pat, all i saw in that thread was talking about torqueing head studs??? the only mention of timing i saw was where the guy said he was running 17.5° at 15 psi and pushing coolant? i don't think those guys running 12° timining making 500whp at i'm sure 20+ psi are on pump gas ;)

Re:is 19 degree at 16psi too much?
 

Id personally start the car out at about 16-18* on the top end in boost until you got a chance to get it on a dyno to see what it likes.
Could you put up your bin or a screen shot of your timing maps maybe.

Dave

Re:is 19 degree at 16psi too much?
 

Fine... here a thread with more info on timing and I read through this one and a few people mentioned pump gas... http://www.honda-tech.com/zerothread?id=440094

Re:is 19 degree at 16psi too much?
 

I blew the holy ---- out of a head gasket the other night. That's what I get for thinking I know how to tune timing maps. ::) Needless to say I'll be running less timing from now on.......

EDIT: Hey Kevin, why is that map you sent me at 28.25 on the topend? :o
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Re:is 19 degree at 16psi too much?
 

Straight timing doesn't tell you anything. You need to know what RPM. Generally all other things being equal your mixture will burn at the same speed regardless if you're at 3000 or 6000 RPM. So at 6000 RPM you need to light it off sooner because the piston is moving quicker and the cylinder pressures will be lower as you pass TDC.

I see no problem at all running 19 degrees at 16 PSI above 4500 RPM with good fuel and a decent intercooler. Some cars I've tuned run as much as 25 degrees at 6000 and 16 PSI

-Michael

Re:is 19 degree at 16psi too much?
 

I agree 100%, the whole idea being to light the fucker off so as to hit peak cyl pressure at around 15* ATDC. As Im sure you've noticed, the reason why timing #'s are throw around without mention of RPM, is that it is assumed that the ramp up in timing will remain close to stock. IE, achieve peak timing at around 3500ish for a D.

Re: is 19 degree at 16psi too much?
 

@ 16psi on my map making 600hp i'm pulling 8 to 9 degrees of timing. at say about 5500rpm so i'd say that's too much timing. But then again i could still add more timing there's barly any in it. People with the AEM i'll share it with you. or post some screen shots of my map