| From | Message |
Taki
Unregistered
4/12/2001
11:11:53
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 Subject: PCM relearns Jet Chip?
IP: Logged
Message:
can anybody tell me if the PCM in our Dakotas (v6 in my case) "compensates" for the Jet Stage 2 chip that i have?
whats the point of the Jet Chip then?
this question has been asked before, but i dont think its ever been answered....
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RonW
*GenIII*
4/12/2001
11:38:20
| RE: PCM relearns Jet Chip?
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Message:
The Jet chip alters the input parameters to the PCM. This may cause the PCM to advance the timing curve or enrich the fuel mixture. Sometimes this works and sometimes it doesn't. The PCM learns through repetition. As it sees a series of inputs over time it remembers steps it has taken based on that input. That means whatever information the Jet alters, the PCM learns. There are many, many parameters that are input to the PCM. I've just mentioned a couple.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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Glen
DakotaEnthusiast
4/12/2001
12:25:58
| RE: PCM relearns Jet Chip?
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Message:
So over all, would it be worth it to get a Jet Stange II or not. I talked to Marty at KRC and he said he can't really program my '01 4.7 yet. And i just got my taxes back, sooooo i was thinkin about just getting a Jet Stage II for now. I guess i could get it and see what happens, but i suppose it would work right? I mean, how else can they sell something if it doesnt do what its "supposed" to do. Hehehe.
'01, CC, SLT, 4.7, Auto, 3.55 LS
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RonW
*GenIII*
4/12/2001
13:33:51
| RE: PCM relearns Jet Chip?
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Message:
How many vendors do you think are out there that sell worthless stuff? You will run across them sooner or later. Will the Jet stage II work for you? It has for some 4.7 owners and not for others. It rarely works at all for 5.2 or 5.9 owners, myself included. Right now, it looks highly unlikely that high performance programs are going to be written for 2001 and above, at least from Mopar. Whether custom written programs will be available remains to be seen.
Let us know what happens if you decide to purchase one. When you reset your PCM to install the JET chip, don't forget that the new power you feel you're getting may be nothing more than the fact that you reset your PCM. You may want to do that first to see what resetting the PCM feels like before installing the Jet chip so you really know what you're getting.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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Python97
Unregistered
4/12/2001
13:44:17
| RE: PCM relearns Jet Chip?
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Message:
I have a 2001 QC 4.7. I had the dealer add some options like a ram air hood and a k&n ram air induction. I also have dual flowmaster cat back. I was talking to bernd about my "aftermarket pcm". He said there is no mopar after market pcm out yet. On the pcm module it says "Authorized software update" Is this a worked pcm?? Can the dealer reprogram the pcm so it has better performance? Will this performance change after time and become like the stock pcm?? I really have no clue when it comes to stuff like this. I hear so many different things I dont know what to believe. If anyone can shed some light on this it would be appreciated!!
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Taki
Unregistered
4/12/2001
13:49:01
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
Im starting to think i opened a can of worms with this question....
has anybody performed dyno tests on a Jet chip? for instance, a "stock" run vs. a "Jet Stage 2" run?
i am most interesterd in the v6 application.
Bernd? anything to add?
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RonW
*GenIII*
4/12/2001
14:43:37
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
"Authorized Software Update" is done by the factory or a dealer authorized by the factory. This update is usually due to a requirement such as a TSB. Most TSB's requiring a flash to the PCM is due to pinging or detonation. The flash retards the timing by about 4º to eliminate the pinging problem. The dealer has no performance parameters that they can update the PCM with. There are very, very few people outside of the factory that know how to deal with the firmware inside the PCM. The person that does the high performance PCM's for Mopar is out here on the West coast and Marty from KRC Performance does some customization out in Florida. Other than that I know of no one else. That doesn't mean there aren't any. I just don't know them.
If you have performance parameters put in, it doesn't revert to the stock parameters over time. What does happen in the PCM is it learns your driving habits over time so if you're real easy on the driving for a couple thousand miles you might feel like you've lost some performance, however, if you then turn around and jump on it for the next couple hundred miles you might feel the performance come back. What most people do is reset their PCM by disconnecting their negative battery cable, then turning their car to start and holding that position for 15 seconds. Then a reconnect of the negative battery cable and VOILA! Your PCM memory tables are cleared and you start off with the basic tables again. Your PCM then learns everything from scratch.
Okay, that's all the light I'm shedding right now. If you want to know more e-mail me privately.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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RonW
*GenIII*
4/12/2001
14:45:58
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
Oh yeah, for Python97:
On your ram air hood and K&N ram air induction, you can't have ram air going less than about 120 mph. What you have is cold air induction.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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Taki
Unregistered
4/12/2001
15:05:39
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
thanks for the info on the Jet chips... im going to keep mine installed, since it does seem to idle better and has more throttle response (i also have an intenseperformance air intake and a flowmaster installed)....
i havent installed the 180 tstat yet, so im sure that will affect things too....
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Python97
Unregistered
4/12/2001
16:51:27
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
I do go 120mph here and there. If I have a hood that has two scoops in the front and a funel that goes from the air box to the hood,sealed at the hood. I think its would be ram air. If im driving the air is being pushed into the box?
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Python97
Unregistered
4/12/2001
16:52:38
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
Ron whats your email?
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RonW
*GenIII*
4/12/2001
17:10:58
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
ron-wong@home.com
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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Glen
DakotaEnthusiast
4/12/2001
17:27:22
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
If and when i do get the Jet Stage II, i'll rest my PCM, drive it for a little while, then rest it again, and put the stage II in, and drive it. I'll report my findings here. Sorry i dont have access to a dyno or anything, so the best i can tell you is what i "feel." And if its crap, oh well... guess i'll have to find some other mods to put on. :)
'01, CC, SLT, 4.7, Auto, 3.55 LS
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nextgen
GenIII
4/13/2001
04:40:39
| RE: PCM relearns Jet Chip?
IP: Logged
Message:
The Jet II chip, really helps with the shift points. Also even after about 3000 miles with the chip it it still performs the same as it did when I first installed it, so to me it was worth it.
Gotta' Make it Go Fasta'
Tony
2000 4.7L 4X4 SLT Plus
Z-Tube w/ 9" Filter, Custom Exhuast, Jet II
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