OEM H22 Low cam/Low Fuel tune
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From: Portland, OR, USA
OEM H22 Low cam/Low Fuel tune
Hey guys,
I have a 93 JDM h22 engine that I really haven't done much to in terms of mods, other then the crap greddy headers and an SP2 exaust and an intake.
I have removed the IAB's along with taking the butterflies out and removing the hardware to enable them, sealing up all the holes.
I have removed the FICV valve? I believe it is, the coolant lines that heat up the throttle body.
Relocated the IAT to the long intake.
Since the H22 really doesn't have a stock tune available we started with the B18C5 map and worked on that, I had the car tuned for about 3 hours 2 years ago and got it running good, but not a whole lot of time was spent on really REALLY smoothing things out, like making the 2d maps ripple free.
I'm currently not running a thermostat , also have all the ECT compensations zeroed out in neptune, I would honestly love to keep the engine running around 170 degrees all year around or even colder, since the H22's burn oil I had an idea to see if I could make tolerances a bit tighter to prevent it "just as a what if idea"... anyway that's a whole other discussion.
The top two photos are what the car was currently running for a low cam fuel/ign map the ignition map looks kinda shitty and the fuel isn't really smooth enough for my liking, there was also a problem where if the car would idle at 800rpm'ish and I would punch it it would sound like it was about to die and the AF went really lean. So I decided to give it fuel at 500rpm-1500rpm under the low load areas.
The next two photos are what I spent a bit of time on and smoothed out and added fuel and corrected the ignition values. I understand the base timing has changed drastically from 16 degrees to about 22-24.. either way the car starts a bit slower then normal due to advanced timing, I'll fix this later but it seems to be a bit more responsive in the low cam area. also in cruise the ignition timing is much higher and seems to run better/cleaner.
I've looked at other original fuel maps/ignition maps for other engines to see if I could find a trend and none of them are really sticking out.
I'm trying to get this damn thing perfect! its like a quest, call me crazy but I don't mind fiddling around with this, I know the safe values for things and I have a good ear to hear knock/ping and most of my testing is just driving around town low loads.
anyway I'm done typing my book lets get some discussion going.
Thanks,
--Aaron
One of the things I was pondering was on the Low Cam ignition map on the top line "3rd photo down" was to have ignition timing sharply increase under low load and low rpm between 800-2500kish and see what that does when I rev it, maybe my ignition maps need to be slightly more agressive under high load and low rpm as well more of a ramp up.
Vtec comes on at 4900 or 4800 or something reasons why i don't include past this on my screenshots.
I have a 93 JDM h22 engine that I really haven't done much to in terms of mods, other then the crap greddy headers and an SP2 exaust and an intake.
I have removed the IAB's along with taking the butterflies out and removing the hardware to enable them, sealing up all the holes.
I have removed the FICV valve? I believe it is, the coolant lines that heat up the throttle body.
Relocated the IAT to the long intake.
Since the H22 really doesn't have a stock tune available we started with the B18C5 map and worked on that, I had the car tuned for about 3 hours 2 years ago and got it running good, but not a whole lot of time was spent on really REALLY smoothing things out, like making the 2d maps ripple free.
I'm currently not running a thermostat , also have all the ECT compensations zeroed out in neptune, I would honestly love to keep the engine running around 170 degrees all year around or even colder, since the H22's burn oil I had an idea to see if I could make tolerances a bit tighter to prevent it "just as a what if idea"... anyway that's a whole other discussion.
The top two photos are what the car was currently running for a low cam fuel/ign map the ignition map looks kinda shitty and the fuel isn't really smooth enough for my liking, there was also a problem where if the car would idle at 800rpm'ish and I would punch it it would sound like it was about to die and the AF went really lean. So I decided to give it fuel at 500rpm-1500rpm under the low load areas.
The next two photos are what I spent a bit of time on and smoothed out and added fuel and corrected the ignition values. I understand the base timing has changed drastically from 16 degrees to about 22-24.. either way the car starts a bit slower then normal due to advanced timing, I'll fix this later but it seems to be a bit more responsive in the low cam area. also in cruise the ignition timing is much higher and seems to run better/cleaner.
I've looked at other original fuel maps/ignition maps for other engines to see if I could find a trend and none of them are really sticking out.
I'm trying to get this damn thing perfect! its like a quest, call me crazy but I don't mind fiddling around with this, I know the safe values for things and I have a good ear to hear knock/ping and most of my testing is just driving around town low loads.
anyway I'm done typing my book lets get some discussion going.
Thanks,
--Aaron
One of the things I was pondering was on the Low Cam ignition map on the top line "3rd photo down" was to have ignition timing sharply increase under low load and low rpm between 800-2500kish and see what that does when I rev it, maybe my ignition maps need to be slightly more agressive under high load and low rpm as well more of a ramp up.
Vtec comes on at 4900 or 4800 or something reasons why i don't include past this on my screenshots.
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