So i just got my 4.6 poor mans stroker back almost 4 months in the machine shop later... To start off here is my strokers brew.
1998 block
clearwater cylinder heads 0331 head
.030 bored
sealed power pistions
258 crank
258 rods
New stock cam
new bearings etc
block decked to run pump gas
ford 24# injectors
Not sure if anything else will be needed to answer my questions. But my questions are am i going to need to adjust the map sensor? If so can someone help me with carification on this i read the two best pages on it and still am a little confused. Im also a little curious about the break in process for the new cam? Thanks!!!
Do you have a wideband O2 sensor? If not you don't know if you need to adjust the MAP. Breakin process is usually like this: Start engine immediately. If it takes more than 3 cranks, stop and fix the problem. I like to bleed the fuel rail first and make sure there is as little as possible air in the coolant. I usually put coolant in, let it sit over night with the front elevated then fill it when its ready to start. Once fired run it between 1800-2000 RPM for 20 minutes, moving the RPMs as well as going around 2500 every so often. Do not let it idle.
SilverXJ wrote:Do you have a wideband O2 sensor? If not you don't know if you need to adjust the MAP. Breakin process is usually like this: Start engine immediately. If it takes more than 3 cranks, stop and fix the problem. I like to bleed the fuel rail first and make sure there is as little as possible air in the coolant. I usually put coolant in, let it sit over night with the front elevated then fill it when its ready to start. Once fired run it between 1800-2000 RPM for 20 minutes, moving the RPMs as well as going around 2500 every so often. Do not let it idle.
Not sure on the wideband o2, how can i tell? I have a 2000 cherokee with california emmisions.
Isn't it going to have running issues if it needs adjusted and isn't? My jeep is California emmissions so it has like 4 o2 sensors. What should I do to make sure it is running properly?
When you break-in the cam at 2-2.5K rpms it'll be in closed loop and the pcm will learn to adjust to the 24# injectors in order to maintain a 14.7:1 AFR. You'll want/need the wideband o2(mounted on the downpipe pre-cat) to determine if your WOT and open loop AFRs are ideal(not necessary during break-in). You'll adjust the piggy-back or adjustable MAP to get the AFRs at WOT down to 12.5-12.8:1 AFR for best N/A power.
showtime3492 wrote:Isn't it going to have running issues if it needs adjusted and isn't? My jeep is California emissions so it has like 4 o2 sensors. What should I do to make sure it is running properly?
Gradon gave you some good advice in his last post. Typically the Jeep's computers are programmed to run leanish at low rpm and go rich higher up, so don't be surprised if you need to enrich the lower rpm and enlean the higher rpm after you've done the cam break-in.
showtime3492 wrote:Isn't it going to have running issues if it needs adjusted and isn't? My jeep is California emissions so it has like 4 o2 sensors. What should I do to make sure it is running properly?
Gradon gave you some good advice in his last post. Typically the Jeep's computers are programmed to run leanish at low rpm and go rich higher up, so don't be surprised if you need to enrich the lower rpm and enlean the higher rpm after you've done the cam break-in.
Thats my problem at least i think it it... Being that i have a california emissions jeep i have 4 o2 sensors in the header and none down stream in the cat.
Also what is a good source for the wide band o2s? I would really like to get this thing running in the next 2 weeks so all the help is appreciated. Im just mostly clueless about keeping this california emmisions set up happy and running properly.
showtime3492 wrote:Gradon gave you some good advice in his last post. Typically the Jeep's computers are programmed to run leanish at low rpm and go rich higher up, so don't be surprised if you need to enrich the lower rpm and enlean the higher rpm after you've done the cam break-in.
You can't do anything about the 14.7 it will run in closed loop. Its running off the O2 sensors and the PCM will keep it at 14.7.
showtime3492 wrote:Also what is a good source for the wide band o2s? I would really like to get this thing running in the next 2 weeks so all the help is appreciated. Im just mostly clueless about keeping this california emmisions set up happy and running properly.
I like my Daytona Sensor's wideband. AEM and NGK also make nice ones. The NGK comes highly recommended.
showtime3492 wrote:Gradon gave you some good advice in his last post. Typically the Jeep's computers are programmed to run leanish at low rpm and go rich higher up, so don't be surprised if you need to enrich the lower rpm and enlean the higher rpm after you've done the cam break-in.
You can't do anything about the 14.7 it will run in closed loop. Its running off the O2 sensors and the PCM will keep it at 14.7.
showtime3492 wrote:Also what is a good source for the wide band o2s? I would really like to get this thing running in the next 2 weeks so all the help is appreciated. Im just mostly clueless about keeping this california emmisions set up happy and running properly.
I like my Daytona Sensor's wideband. AEM and NGK also make nice ones. The NGK comes highly recommended.
Ok so Ill look into the aem and ngk ones, is there anywhere that i can find a cheap wideband reader? I apologise if this seems like it is going in circles Im kinda confused on how this is gonna work being that it is cali emissions.
If anyone can break this down a little bit more step by step id really appreciate it. what im gathering now is
get a wideband
read what the air fuel ratio is
then adjust map sensor accordingly?
Once you get a o2 bung welded in on the downpipe after the merge or before the underbody cat and install the wideband o2 sensor in it, then you will drive to a empty stretch of road and then floor it(WOT=wide open throttle). You'll want the AFR gauge to be 12.5-12.8:1 AFR for best power. You determine from results whether you have to increase the MAP voltage from 5V or decrease it from 5V in order to get that AFR(assuming you've installed an adjustable map).
showtime3492 wrote:Ok so Ill look into the aem and ngk ones, is there anywhere that i can find a cheap wideband reader? I apologise if this seems like it is going in circles Im kinda confused on how this is gonna work being that it is cali emissions.
Usually the wideband sensor comes with a "reader". Its usually some form of display or gauge. I would look one that logs RPM, O2 and a third input, which depends on your tuning method.
get a wideband
read what the air fuel ratio is
then adjust map sensor accordingly?
Yes, basically. Keep in mind that the MAP sensor adjustment will only be functional in open loop (WOT).
gradon wrote:Once you get a o2 bung welded in on the downpipe after the merge or before the underbody cat and install the wideband o2 sensor in it, then you will drive to a empty stretch of road and then floor it(WOT=wide open throttle). You'll want the AFR gauge to be 12.5-12.8:1 AFR for best power. You determine from results whether you have to increase the MAP voltage from 5V or decrease it from 5V in order to get that AFR(assuming you've installed an adjustable map).
To start off here is my strokers brew.
