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SN95 Cobras
C-head swap....emissions equipment?
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<blockquote data-quote="mustang8650" data-source="post: 12115949" data-attributes="member: 108461"><p>Mwolson, from reading around on the forums here you seem to know alot about emissions, but I also saw something where you were talking about deleted IMRC's, just noticed you said ...</p><p></p><p>"I don't know how to fool the PCM into thinking deleted IMRCs are still there with resistors, but I think that is a really bad idea. If the PCM thinks the EGR is there, and adds the spark advance from the table, your chances of detonation will go way up."</p><p></p><p>When I noticed you talking about that I started looking around for info on what to do when you have C heads and deleted the IMRC's, can the IMRC's just be turned off in the tune? I would assume I wouldn't want the PCM thinking they are there and using tables and making adjustments based on that making my car act all funny...</p><p></p><p>I tuned my 86 GT TT myself with a DFI Gen 7 system, was a learning curve for sure, and I know I still don't come close to understanding all of it like the big boys in this field, but one thing I did learn the hard way was one little lookup table based on whatever variable that isn't just right is enough to throw the whole tune off...for example timing and fuel based off of ECT temps, IAT temps etc....I imagine the stock PCM is even more complex given emissions and IMRC lookup tables and other lookup tables a DFI doesn't even have. I just now read one guy deleted his IMRC's and it idled rough at 700 rpm's with AC on and the revs came down slow when AC off...</p><p></p><p>I was thinking of getting a tuning solution for the stock PCM and tuning this thing myself to gain experience and knowledge etc...now I'm second guessing whether I'm gonna get in over my head doing that, I'd have alot closer tune to start out with for this car, but at the rate I'm learning about this car its making me realize how much I don't know LOL, time to read read read and have a professional tuner lined up if I fall astray....</p></blockquote><p></p>
[QUOTE="mustang8650, post: 12115949, member: 108461"] Mwolson, from reading around on the forums here you seem to know alot about emissions, but I also saw something where you were talking about deleted IMRC's, just noticed you said ... "I don't know how to fool the PCM into thinking deleted IMRCs are still there with resistors, but I think that is a really bad idea. If the PCM thinks the EGR is there, and adds the spark advance from the table, your chances of detonation will go way up." When I noticed you talking about that I started looking around for info on what to do when you have C heads and deleted the IMRC's, can the IMRC's just be turned off in the tune? I would assume I wouldn't want the PCM thinking they are there and using tables and making adjustments based on that making my car act all funny... I tuned my 86 GT TT myself with a DFI Gen 7 system, was a learning curve for sure, and I know I still don't come close to understanding all of it like the big boys in this field, but one thing I did learn the hard way was one little lookup table based on whatever variable that isn't just right is enough to throw the whole tune off...for example timing and fuel based off of ECT temps, IAT temps etc....I imagine the stock PCM is even more complex given emissions and IMRC lookup tables and other lookup tables a DFI doesn't even have. I just now read one guy deleted his IMRC's and it idled rough at 700 rpm's with AC on and the revs came down slow when AC off... I was thinking of getting a tuning solution for the stock PCM and tuning this thing myself to gain experience and knowledge etc...now I'm second guessing whether I'm gonna get in over my head doing that, I'd have alot closer tune to start out with for this car, but at the rate I'm learning about this car its making me realize how much I don't know LOL, time to read read read and have a professional tuner lined up if I fall astray.... [/QUOTE]
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C-head swap....emissions equipment?
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