went to the dyno and car was running pretty good. my tuner had it running and idling fine, however, when he would try to do a pull we would have a rev limit between 6500 to 7000 . it was very odd, because right around the 6500 to 7000 rpm range he was having to run the injectors (rc 550cc) over 90% duty to reach the correct afr. we also kept getting ghost cells that would show up, go away, and persisted through many of the runs. also, i kept getting an iacv cell so we took it off, cleaned it up and reset the ecu. we cleared the code, but would see it pop up every now and again, but not as much as before. so in attempt to get rid of our early rev limit we switched out the s200 and ecu for another s200 and ecu to find that we were still having the same problem. finally, he went and picked up his s300 and the car reved all the way up to redline. he made one more pull with the s300 and that was all she wrote... a big cloud of white smoke filled the bay. so my question is, does anyone know what was going on or experienced anything like this? this is a stock b16a (15+ years old, so thats probably most of the problem) running an sc34 at about 8-10 lbs. i just don't want to replace the headgasket and run into the same problem again if this is some sort of mechanical issue.

also, what headgasket replacement would you recommend? ive thought about purchasing either an oem headgasket or an inline pro, however, im not certain on what thickness i should go with? this is a b16a out of an integra xsi (92 or 93 model) with 10.4 for compression (i believe). id like to maybe be in the mid to high 9 range. any recommendations?

thanks to anyone who can help

 

how do you know what kind of condition his wide band sensor was in ?

how much timing was in the engine @ the point of breakup ?

happen to log fuel pressure ?

 

i believe he was logging off my plx which has less than 300 miles on it. it seems to be performing correctly.

im not sure on timing ill have to ask and see if he still has the log.

i don't believe we logged fuel pressure, but i did watch my fuel gauge and it was around 45 at idle and would climb to ~60 at the top where it would hit the rev limit

 

weird... most tuners with dynos have widebands that directly datalog with the dyno output.

 

he did, an innovative i believe, however, he was having problems with it so he used mine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Origin &raquo;</TD></TR><TR><TD CLASS="quote">i believe he was logging off my plx which has less than 300 miles on it. it seems to be performing correctly.

im not sure on timing ill have to ask and see if he still has the log.

i don't believe we logged fuel pressure, but i did watch my fuel gauge and it was around 45 at idle and would climb to ~60 at the top where it would hit the rev limit</TD></TR></TABLE>

Im guessing you dont have Aermotive 1:1 Fuel pressure reg. ?

 

yeah i have the aeromotive fpr

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95exdsmkilla &raquo;</TD></TR><TR><TD CLASS="quote">

Im guessing you dont have Aermotive 1:1 Fuel pressure reg. ?</TD></TR></TABLE>

What difference would this make? Well, how much money do you have? If its just a headgasket then replace it with an oem one and some ARP studs and get that thing retuned conservatively. Assuming you trust the tuner. But if you have money, throw a set of rods and pistons in there and put it back together with the new oem gasket and ARP studs.

 

assuming the 45 is with the vacum on, it would raise ~10 psi with the vacum off, that would put the fuel pressure @ 55 psi @ 0 vacum/boost. with 10 psi of boost on top of that, the fuel pressure should be close to if not.. 65 psi ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaveF &raquo;</TD></TR><TR><TD CLASS="quote">assuming the 45 is with the vacum on, it would raise ~10 psi with the vacum off, that would put the fuel pressure @ 55 psi @ 0 vacum/boost. with 10 psi of boost on top of that, the fuel pressure should be close to if not.. 65 psi ? </TD></TR></TABLE>

that varies. some setups, the fuel pressure would go up only about 5psi with the vacuum removed. 60psi at 8psi-10psi seems like where it should be.

i would like to know if ur tuner synced the dizzy timing with the timing in the map and also how much timing he was run n at 8 psi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpoolnG2 &raquo;</TD></TR><TR><TD CLASS="quote">

What difference would this make? Well, how much money do you have? If its just a headgasket then replace it with an oem one and some ARP studs and get that thing retuned conservatively. Assuming you trust the tuner. But if you have money, throw a set of rods and pistons in there and put it back together with the new oem gasket and ARP studs. </TD></TR></TABLE>

kinda strapped for cash right now, would rather just go with the headgasket/stud suggestion, but thanks for the advice.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted k20 &raquo;</TD></TR><TR><TD CLASS="quote">

that varies. some setups, the fuel pressure would go up only about 5psi with the vacuum removed. 60psi at 8psi-10psi seems like where it should be.

i would like to know if ur tuner synced the dizzy timing with the timing in the map and also how much timing he was run n at 8 psi</TD></TR></TABLE>

he did sync the dizzy and was running between 12 - 14 degress of timing @ 8psi.

 

12-14* at 8 psi? seems really low for a B16 with that turbo setup.

but u say it was a 92 motor? high mileage?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Origin &raquo;</TD></TR><TR><TD CLASS="quote">he did sync the dizzy and was running between 12 - 14 degress of timing @ 8psi.</TD></TR></TABLE>


jesus.... i'd say your off just a little on the timing.


FWIW i have seen numerous PLX widebands that appear to be working correctly that are not. you keep adding fuel thinking thats the issue but really it gets to the point that its running so rich it wont pull through it anymore.


have you pulled the head yet? almost sounds more like a broken sleeve than a blown headgasket.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted k20 &raquo;</TD></TR><TR><TD CLASS="quote">12-14* at 8 psi? seems really low for a B16 with that turbo setup.

but u say it was a 92 motor? high mileage? </TD></TR></TABLE>


i believe so. i bought the motor originally from hmotorsonline. of course they say its a low mileage motor, but to be honest, i have no idea as to what mileage the motor actually has. i did a compression test before and if i remember correctly it was 190-195 across the board. always seemed to be a strong, healthy motor, but the dyno proved me wrong

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


jesus.... i'd say your off just a little on the timing.


FWIW i have seen numerous PLX widebands that appear to be working correctly that are not. you keep adding fuel thinking thats the issue but really it gets to the point that its running so rich it wont pull through it anymore.


have you pulled the head yet? almost sounds more like a broken sleeve than a blown headgasket.</TD></TR></TABLE>

i hear about the plx having their problems quite often. it did seem to respond to the fuel changes that were given, however, how accurate it was reading them is something i cannot answer. any test to make sure the plx is reading correctly?

i have not had the time to pull the head yet. i hope your assumption isn't true

 

oh and im really considering purchasing an oem headgasket for replacement. the inlinepro is nearly 190 bucks, cometic not being too much cheaper, and i would need to purchase adj. timing gears (not to mention i just sold my AEM's ) if i really wanted to lower my compression. any opinions on this? should i not go with the oem gasket?

 

i've been using a PLX wideband to tune cars for 3+ years now. i always change the sensor every couple of months though just to keep the maintenance up. i have zero issues with it.

 

if the motor came from japan it is low mileage. its law to pull motors after 50,000k.

trippy eh?

ive been using the same bosch o2 sensor with my LC-1 for a year and i just had it on the dyno.... guess what. it reads perfectly still

i dunno what sensor the PLX uses, but if its a Bosch LSU 4.2 it should have a service life of over 100,000km.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by welfarepc &raquo;</TD></TR><TR><TD CLASS="quote">if the motor came from japan it is low mileage. its law to pull motors after 50,000k.</TD></TR></TABLE>

lol, good joke, i took apart the last b16 i got from japan and it looked like it had over 150k on it, shot rod bearings, main bearings, oil coked on every part, it was rediculous. but my b16b on the other hand i got from japan was so clean i could eat of it!

you never know what your gonna get, some of these people never change there oil, they figure hell I'm only gonna have it for 50k, there not gonna maintain it properly, also just like we do funny smogs here I'm sure they got something similar over there were they just pay off the man and keep there motor in there.

 

well got the head pulled off and ive got a cracked sleeve on my number 2 cylinder. head shows no signs of damage. guess ill be looking into building a bottom end after all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Origin &raquo;</TD></TR><TR><TD CLASS="quote">
also, what headgasket replacement would you recommend? ive thought about purchasing either an oem headgasket or an inline pro, however, im not certain on what thickness i should go with? this is a b16a out of an integra xsi (92 or 93 model) with 10.4 for compression (i believe). id like to maybe be in the mid to high 9 range. any recommendations?

thanks to anyone who can help</TD></TR></TABLE>

i had a xsi swap, made 380s before it broke a ring land. had a 35r on it. love the high compression