ok went to the dyno today to get tuned for 10psi... he couldnt get it fully tuned because once i hit full boost the afr would go down past 10:1 and tried everything to lean it up and it did nothing.. at the same time my coolant overflow bottle was shooting coolant out like crazy. he said coolant was probably entering the combustion chamber and messing up the afr.

i have a d16z6, the thing is it has brand new oem headgasket and arp head studs torqued to 70 ft. lbs.. so i dont know what the deal is.. didnt have any coolant overflow at 5psi of boost but once i turned it up to 10psi, it was all over..

any input or help..?

 

he also said i shouldnt have to do anything with the timing maps, just leave them stock.. i was like whaa?? since im only running 10psi on a d16z6 greddy 15g kit. i had him pull a couple degrees though. doesnt timing affect headlift.. what should the timing look like for it to not cause headlift?

 

yea your lifting your head under boost. Alot of d16 guys have this problem. Do a search for detailed information.

i went through 4-5 headgasets trying things, before i just sleeved the block. no issues at all now. more boost and a bigger turbo as well.

platinum.

 

blowby? maybe u need a catchcan setup? i don't know. just throwing ideas. and u do need to retard your timing.

 

Um, how much timing was taken out. Definitley sounds like your head is lifting to me...

 

i would definetely consider the head lifting scenario

 

i know my head is lifting... hence why i have arp headstuds and brand new headgasket. ive been dealing with headlift problems for a year now.. no problems at all at 5psi.

i did have him pull a couple degrees of timing... i even tried 1degree per 1psi and it didnt help anything.

 

Did you have your head mating surfaces checked for plane (sp)?

 

Sounds like your tuner ran way too much timing and blew your headgasket.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">Sounds like your tuner ran way too much timing and blew your headgasket. </TD></TR></TABLE>

no it was doing this before on a very conservative map before i went to go get it tuned..

what should timing be? .75:1psi or 1:1psi ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93turbo16 &raquo;</TD></TR><TR><TD CLASS="quote">Did you have your head mating surfaces checked for plane (sp)?</TD></TR></TABLE>

yep they were good.

 

Find a new tuner.

Timing should be wherever the engine produces peak torque for that Load/RPM point.

What are you tuning the car with?

 

e-manage.

i was told lightspeed in st louis was the best for e-manage and hondata..

 

hmm it could also be because i didnt put the dowel pins back on the head..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike93eh &raquo;</TD></TR><TR><TD CLASS="quote">hmm it could also be because i didnt put the dowel pins back on the head..</TD></TR></TABLE>

why did you take them out in the first place?

its probably not line up correctly

 

what he said. why did you take them out? how did you line it back up? it has to be precise.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by komat &raquo;</TD></TR><TR><TD CLASS="quote">why did you take them out in the first place?

its probably not line up correctly</TD></TR></TABLE>

i havent had them in the whole time i was boosting 5psi and it was fine. but now at 10psi im having problems. coolant only starts shooting out at full boost. if i dont boost at all i have no problems.

i think they just fell out when i took the head off one time and forgot to put them in..

what im going to do tommorow is take the y8 head off, rebuild my spare z6 head and resurface it and throw another new headgasket set on and torque step the arp's to 70 ft lbs.

should i use copper spray or not? ive always used it but after searching it seems half the people say dont use it and the other half say use it..

 

im also hoping maybe its because im using a y8 head on a z6 block. i know y8 timing is all different. ive never actually understood what is different though but maybe it has something to do with it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike93eh &raquo;</TD></TR><TR><TD CLASS="quote">im also hoping maybe its because im using a y8 head on a z6 block. i know y8 timing is all different. ive never actually understood what is different though but maybe it has something to do with it.</TD></TR></TABLE>
Ahh now the truth comes out. If it wasn't the fact that you left out the dowel pins then I can almost guarantee you were running way too much timing for a y8 head. If you look at the actual p2p y8 timing maps then run something like 10* less timing at full load than a p28 map. The y8 head requires MUCH less timing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">Ahh now the truth comes out. If it wasn't the fact that you left out the dowel pins then I can almost guarantee you were running way too much timing for a y8 head. If you look at the actual p2p y8 timing maps then run something like 10* less timing at full load than a p28 map. The y8 head requires MUCH less timing. </TD></TR></TABLE>

i see... well going to start working on redoing everything tommorow and see what happens..
i knew i should of never got the y8 head, but when i was piecing together this engine i couldnt resist a complete y8 head for $50. i couldnt find any z6's at the time.

does anyone by chance know if a d15b7 dizzy will work on a z6 head?

 

There is nothing wrong with the y8 head. You just need less timing to make the same amount of power. Also I don't believe a d15b7 dizzy will fit on a z6 head.

 

got the z6 disassembled and its going to the machine shop tommrow..

i still cant believe my tuner said that no timing needed to be taken out with a greddy kitted z6 at 10psi.... i didnt want to start an argument with him because he's the tuner. im no tuner so i dunno.. but i insisted he take some out anyway's. anyone?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike93eh &raquo;</TD></TR><TR><TD CLASS="quote">got the z6 disassembled and its going to the machine shop tommrow..

i still cant believe my tuner said that no timing needed to be taken out with a greddy kitted z6 at 10psi.... i didnt want to start an argument with him because he's the tuner. im no tuner so i dunno.. but i insisted he take some out anyway's. anyone?</TD></TR></TABLE>
what ecu were you using in the first place? I'm assuming p28 since you have an obd1 car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">what ecu were you using in the first place? I'm assuming p28 since you have an obd1 car. </TD></TR></TABLE>

yep p28

 

yea your timing was EXTREMLY high then. That could have blown your headgasket for sure without a doubt.