Where can I get the conversion harness and a PBD1 p28 ecu? I guess im in the market.... 
Can you 'tune' a stock ECU?
- Thread starter J32a2OwnsU
- Start date
conversion harnesses are obd specific...
for example..there's obd2a to obd1 or obd2b to obd1 or vice versa...
p28 is an obd1 ecu closest to ur needs and they like chipping them...
so u need a obd2b to obd1 conversion harness..they go for about $70...
check pgmfi.org check ebay they sell them everywhere now...
u can also look into getting a vafc
for example..there's obd2a to obd1 or obd2b to obd1 or vice versa...
p28 is an obd1 ecu closest to ur needs and they like chipping them...
so u need a obd2b to obd1 conversion harness..they go for about $70...
check pgmfi.org check ebay they sell them everywhere now...
u can also look into getting a vafc
The ecu puts the car into closed/open loop not an O2 sensor. The only diffrence between narrow and wide band is the voltage range, narrow only uses a 0-1v range where wide uses 0-5v. you can bul semi acurate readings off a narrow band but not the best and thats why i said use it to get a basemap.93turbo16 said:
target A/F for ideal combustion is 14.7 for gas, its stoichiometric 13 is used as a buffer area on na cars and 12.5 is used for turbo, giving a little room for f**kups. http://www.cdxetextbook.com/fuelSys/gasoline/fund/05.html
For better clarity yes crome uses a wideband but turboedit, uberdata, and BRE use a narro signal to on their autotune. I can even go get the formula they use to do it if you want.
The ecu can't do s**t without a narrow band O2 sensor, that is what puts it into closed loop.. but yes you do have to have the ecu look for the O2 also. There are two components.io_303 said:
14.7 is ideal for most conditions, but not WOT. If it is ideal for WOT then why is it not tuned to? I am not saying it isn't stoich.. I know it is. BUt don't go telling people to tune to 14.7
I know the formulas as well, and they don't use an auto tune for uberdata. Where did you get that from? The only auto tune feature they use has a spread sheet on Excel, and guess what last time I checked the formulas to datalog Narrowband on uberdata didn't work.
you cannot use a narrowband to auto tune anything. You just can't.. the voltage signals like you said are way to short, and are only accurate from like 14.1-14.9 or so. They can't do anything on either side of that.
Open and closed loop is controled based on engin temp and throttle. Open loop is when your ECU is running off maps, and that is at Idle and 3/4 to WOT at temp. Closed loop is at crusing or slight accel and the O2 detrmines your fuel delivery and ignores the maps.93turbo16 said:The ecu can't do s**t without a narrow band O2 sensor, that is what puts it into closed loop.. but yes you do have to have the ecu look for the O2 also. There are two components.
14.7 is ideal for most conditions, but not WOT. If it is ideal for WOT then why is it not tuned to? I am not saying it isn't stoich.. I know it is. BUt don't go telling people to tune to 14.7
I know the formulas as well, and they don't use an auto tune for uberdata. Where did you get that from? The only auto tune feature they use has a spread sheet on Excel, and guess what last time I checked the formulas to datalog Narrowband on uberdata didn't work.
you cannot use a narrowband to auto tune anything. You just can't.. the voltage signals like you said are way to short, and are only accurate from like 14.1-14.9 or so. They can't do anything on either side of that.
How does stoich change at WOT it dosent. Ideal combustion is always going to happen at 14.7 regardless of engine speed. Now like i said most people tune lower beacuse rich is better than lean.
yes you can auto tune with a narrow band, it is done all the time, not using the voltake values but how long it dwells at eather end(rich/lean), pulse width of the injectors, map readings(or maf), and engine RPMs
I know how it works. And closed loop is used at idle as well. Go into open loop without an O2 sensor and see what happens.io_303 said:
Oh and i never said 14.7 wasn't stoich at wide-open throttle. I was more getting at the targets at which to tune to.
Eh there is no point in arguing this out. It doesn't matter one bit either way.
I am still gonna stand by the no auto tuning with a narrowband, it is not accurate enough to do so. Now if you are refering to O2 feedback and closed loop as auto tuning, then yes. But other than that, it just can't with a narrrowband sensor.
Link me to BRE's auto tune. I use it as well, but haven't in a while.
BTW this is pulled right from Ben's how to guide.
"BRE supports real-time AutoTune. To use this you must have the datalogger open, and a properly setup wideband o2 sensor run into your ECU. BRE needs to know the afr in order to do this. Using the real-time AutoTune feature is very easy. All you need to do is hit Ctrl+Shift+R (or click the Logger->Start Real-Time AutoTune menu item) with the logger running."
first the ECU wont go into closed loop without an O2 sensor present. It will just throw a code and run maps all the time.93turbo16 said:
As for the auto tune, I use the datalogging and then adjust maps using its sugested values. I know its not realtime(I dont have the equipment) but it will sugest better values. They are rough like I said but it can do it. My car has since been tuned with a 5-gas, but thats how i got my basemap. But i did just go read more, and it says it wouldent work with narrow...but it kinda dfid...It got me running better and the values when i got hte wideband werent far off of my target. Oh well
Not true. You can run either one. THe P72 has a knock board that the P28 doesn't. You don't have to run the IABs. You can run a P72 on a SOHC vtec if you wanted to. It doesn't matter.Blazed said:
But as far as price the P28 wins for the most part. Not many people use knock boards anyway.
the p28 can run the IABs if it is chipped right, and you mod the ecu
http://www.pgmfi.org/twiki/bin/view/Library/WebHome?topic=AddIABToP28
http://www.pgmfi.org/twiki/bin/view/Library/WebHome?topic=AddIABToP28