Built B16A

bump cuz, its the day before thanksgiving... and im back to stock, going to hit the smog shop friday.

so come saturday, i'll be trying to get this P28 running right, then continue on my quest for boost with real management.

on a side note... i have a known good set of OBD0 B16A injectors.. i plan on running DSM 450's which will require resistors just like the OBD0's.. could i run the B16's, with the Stock P28, and then slap in the 450's under management?

DaX

iTrader: (1)

Sounds good to me...just be sure to use a resistor box.

Built B16A

actually i found an old EF chassis harness with the green plug, i think im going all OEM quality and doing it right. (like the master DAX's write up i have in my bookmarks)

Built B16A

well.. i passed smog today, so tomorrow i'll start getting the turbo back on. and finally get with it on tunning this mo fo..

also today i put in a B&M FPR... so if anything with my smaller injectors, at idle i can crank it up, so i don't lean out at idle.. and i still have the VAFC in... so im not sure if im going to watch that.. or just take it out?

wideband right now is my best friend, i think i would be lost without it.

Joseph Davis

FPR = waste of money. You have UD, adjust as needed at the ECU.

Built B16A

im back with an update.

not a big update.. but atleast i got somewhere..

a few days ago, i got it smogged, so now im good for another 2 years.

so the turbo went back on last night.

i got the P28 in again, and disconected the EGR lines, and plugged em. also, im running a 4 wire O2.. and hard wired to the ECU.

right now.. NO CEL's.. but, i can't get any basemap to run for ****. everytime i switch it over to the EPROM, it starts surging.

on the stock P28.. its running, and idleing like i wanted it to 2 weeks ago.






this is still on the VX injectors.. but in order to keep the air/fuel right, i had to raise the fuel pressure to 40PSI at idle.. alittle higher.. but i still haven't found some Si injectors.

sporkcrx

PS-he still has the vafc because he likes how it looks pretty

Built B16A

you suck dick for crack.. haha.. get the **** outta here! hahahha

DaX

iTrader: (1)

Sounding more and more like the small injectors. JW...did you use any of my methods for o2 wiring or resistor box wiring?

Joseph Davis

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Built B16A &raquo;</TD></TR><TR><TD CLASS="quote">right now.. NO CEL's.. but, i can't get any basemap to run for ****. everytime i switch it over to the EPROM, it starts surging.</TD></TR></TABLE>

Define "run for ****" - that tells me nothing. If you are running your wideband through the ECU, and datalogging via CN2 port with UD, I fail to see how you can't get the car running well.

There are a couple different IACV used and different batches of code to control them. Some are not entirely compatible, which is where you get surging. You can adjust IACV slider to eliminate surging once the engine is warmed up. Nothing we can do for you atm about surging at cold idle, that's still in the works.

nonvtecD

Whats stock fuel pressure, thought it was 40 psi? But you raised it to that?

DaX

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D15B7turbo &raquo;</TD></TR><TR><TD CLASS="quote">Whats stock fuel pressure, thought it was 40 psi? But you raised it to that?</TD></TR></TABLE>

About 37psi static.

Built B16A

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">Sounding more and more like the small injectors. JW...did you use any of my methods for o2 wiring or resistor box wiring?</TD></TR></TABLE>

im getting a set of known working 240CC SI injectors tomorrow, and i'll return the FRP back to stock.. after that, it should purr like a kitten.

right now, im running a bosch 4 wire O2.. hard wired to the ECU. the wideband is standalone. just too look at.

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

Define "run for ****" - that tells me nothing. If you are running your wideband through the ECU, and datalogging via CN2 port with UD, I fail to see how you can't get the car running well.</TD></TR></TABLE>
well.. ok.. the stock P28.. cold start idle is alittle higher than normal.. i wanna say around 1500 RPM.. once it warms up.. when i come to a light, it starts to surge like a vaccum leak, and after about 5 cycles, it smoths out, and then will idle at 750 RPM with 14.5 A/F. weird.

UD chips... a waste of time.. every chip, other than a STOCK P28 program throw a solid CEL, and buck like nasty... im not sure what to do.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J. Davis &raquo;</TD></TR><TR><TD CLASS="quote">
There are a couple different IACV used and different batches of code to control them. Some are not entirely compatible, which is where you get surging. You can adjust IACV slider to eliminate surging once the engine is warmed up. Nothing we can do for you atm about surging at cold idle, that's still in the works.</TD></TR></TABLE>
can you explain this IACV slider alittle more? cold idle isn't a problem, its when i come to stops.. and i think the fact that its surging, and adding more air, (vaccum leaks show lean A/F) reflects a shitty idle, and weird A/F's.

is this the valve on the very back of the manifold with 2 coolant lines going through it? i know you unplug it to set idle adjustments, but i wonder if this is a conflict with the new ECU?

again.. basic basemaps.. both set on 240CC injectors and 180CC's.. buck mad crazy, and throw a solid CEL.. i know i chipped my EPROM right.. so im sorta lost for words.

CivicEJ1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Built B16A &raquo;</TD></TR><TR><TD CLASS="quote">can you explain this IACV slider alittle more?</TD></TR></TABLE>


I'd like to know too....

my setup seems to surge after I come to a stop once in a while.

Built B16A

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX &raquo;</TD></TR><TR><TD CLASS="quote">Sounding more and more like the small injectors. JW...did you use any of my methods for o2 wiring or resistor box wiring?</TD></TR></TABLE>

today i put in some JDM D15B's... and same issue.. still runs fine on the stock P28, but once i go into a chipped program from uberdata, it runs like crap...

today i was tinkering with it.. and wondered what would happen if i unplugged the IACV like if i was going to adjust the idle... and what do you know.. it stops surging?

so i cleaned out the IACV again, and no change in performance...

the thing is.. the IACV has no problem on the stock P28, only has issues on chips... i don't get it.

93TurboSi

sounds like the duty cycle for the IACV is set way to high in your uber data program.

with my AEM i keep the idle adjust screw all the way in and totally control idle witht he IACV it usually only needs about 35% duty cycle to idle at about 900 rpms

fatalman

its probably because of all the 909 smog

Built B16A

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93TurboSi &raquo;</TD></TR><TR><TD CLASS="quote">with my AEM i keep the idle adjust screw all the way in and totally control idle witht he IACV it usually only needs about 35% duty cycle to idle at about 900 rpms</TD></TR></TABLE>

duty cycle? explain this alittle more.. cuz in uberdata 1.70 there is an adjustment for IACV.. -50 all the way to +50.

ok... now an update.. i figured my idle is fucked.. thats fine.. but lets see how it runs.. so i left the missing link on, but dissconnected the FMU... took it for a spin.

11-12.5 : 1 A/F... not bad.. not bad at all..

went back home, and removed the missing link... and burned a GSR w/ imported P28 program with 240CC injectors and boost.. and took her for a spin...

at 1st.. i boosted like 2PSI.. and no CEL... so the true test.. WOT.. i hung around the area of 11.4-12.4 and solid 6 psi the whole way..

im surprised...

but once i come to a stop, the idle surges... so thats the disapointing factor.

if you guys would like to see a shitty MPEG movie of my G Ride.. here ya go.

<FONT SIZE="5">VIDEO!</FONT> http://www.typegsr.x10hosting.com/JDM/turbovid.mpg


Modified by Built B16A at 1:47 PM 12/7/2004

Built B16A

well.. i think ive come to the final conclusion.

after finding out that the 240 CC injectors can handle the 6 PSI its getting, i proceded to try and tackle that idle issue.

now, even after cleaning the IACV... my car would only surge after you give it gas, and eventually it would stop, and come down to normal idles..

well, a buddy of mine, with a B20 VTEC told me to check the 6 or 7MM butterfly bolt at the bottom of the TB, and put your idle screw in all the way... hrmm..



so... i did, i screwed in the idle adjustment at hte TB.. and whad'ya know.. its normal.

god damn, for days, i was looking for the answer.


so.. as of today.. its running 6 PSI.. D15Z1... HMT... and a clean 12:1 A/F... time for the dyno.. then a D15B swap.

93TurboSi

that was the idle adjust screw i was speaking of in my last post. the stock ecu has a preset map for the iacv so the only way to adjust idle is with that screw. once you switch to standalone system that can control the IACV anyway you want you can turn that srew all the way in and eliminate it as a variable in your idle.

Built B16A

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93TurboSi &raquo;</TD></TR><TR><TD CLASS="quote">once you switch to standalone system that can control the IACV anyway you want you can turn that srew all the way in and eliminate it as a variable in your idle.</TD></TR></TABLE>

****, i must not of understood that.. well, idles are alittle higher than i anticipated still.. but they're defenetly not surging like before.. i might try and lower idle in uberdata now..

still havne't got an answer about that IACV adjustment in uberdata.. dunno what = or - does.

DaX

iTrader: (1)

Awesome to hear that you got it running. Nice background music for the vid.

Here's my best explanation of duty cycle:

The IACV is merely a solenoid. If you give it voltage, it's all the way open, if you remove voltage, it's all the way off [or vice versa, i don't know]. The way to achieve an IACV opening somewhere between wide open and completely shut is through duty cycle. For the sake of argument, let's say the ECU has a control period of 1 second [which is way longer than it really is]. The ECU will send the IACV a voltage for a small portion [percentage] of that control period. If the IACV is running at 50% duty cycle, then the ECU sends a voltage signal for 0.5 seconds every second, allowing a "mid-range" opening. Just think of having a small DC motor and a battery. If you have the motor hooked up, it's going to run full speed...not hooked up it won't run. But if you switch the motor on and off really fast, you'll achieve an intermediate speed.

The slider bar in Hoberdata tells the IACV what duty cycle to run at. A larger duty cycle means the IACV is open wider, allowing more air to bypass the throttle plate, and vice versa.

Built B16A

great dax.. and thank you for the sucsess....

right now after the i screwed in that idle adjustment, i thought for sure the idles would fall on its face, but sure enough, it was fine.. i was shocked.

but thanks for explaining the IACV.. i looked at it yesterday, pinched the coolant lines, and pulled it off, and cleaned it AGAIN.. no change.. but i noticed, the coolant lines only go through a chamber of the back, so aside from the small electric motor on the side, its mainly a vaccume regulator.. hrmm...

i'll try and max out the IACV tab and see what does what... but last time i tried.. really made no differance.. ide love to hear what a script or program writer for uberdata say's.

DaX

iTrader: (1)

Make sure your fast ilde thermo valve is in good shape too. If it's not all the way loose, you won't have the horrible idle but the IACV won't be able to control the idle.

What is your base idle set at? Check this with the IACV unplugged [fully closed].

Maxxing out the IACV will just open it wider and make your idle surge even worse. You need to adjust the IACV duty cycle down. If you have a meter, check the resistance on the two leads on the IACV. You should have about 11.5 ohms.

93TurboSi

ahh the joys (and extreme cost) of aem. the aem allows you to choose an exact dutycycle in % for all your rpm breakpoints and it has Idle feedback so even if you have it set to 40% duty cycle and that would give you a 1200 rpm idle but you have your idle target set to 900rpm the idle feedback would slowly learn to take away a bit of dutycycle to keep it were you want it.

i have my idle target at 900rpm and my IACV dutycycle at that point is at 35% but it usullay has a idle feed back of -4% or so which puts me at 31% dutycycle to maintain 900 rpms with no accesories on. so i would try setting your duty cycle between 30-35%