Re: mag 5.9 sensor questions and what is this?
[Re: Andrewh]
#89411
07/18/08 11:15 AM
07/18/08 11:15 AM
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Joined: Feb 2003
Posts: 4,204 Fort Worth, TX
Clair_Davis
master
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master
Joined: Feb 2003
Posts: 4,204
Fort Worth, TX
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Well, I figured out where I screwed up on my ASSumption that the Chrysler CTS was the same as the GM parts. I ASSumed that they reacted the same, since the MAP and TPS generally do (as long as you make sure the wiring outputs are correct). In fact, the Chrysler CTS relies on some code in the PCM and some switched resistors to give the PCM the coolant temp info it needs. Basically, the PCM uses one resistor set to get very accurate temp data up to about 125*F, then switches to another resistor set to get very accurate temp data above 125*F. I found this information here: http://www.kemparts.com/TechTalk/tt14.aspSo, my bad on making what amounted to a wild-a$$ed guess that Chrysler would do something as simply as GM did... I still think they COULD set up the temp/ohm table to reflect the Chrysler sensor values, since Megasquirt can handle that pretty easily. My other question is, what other CTS units are out there that provide the response curve Painless wants, but fit the Chrysler location? Adding a $20 sensor to their kit would be a nice solution compared to drilling/tapping the manifold or cobbling together a squirrelly-looking stand pipe. Sorry for the confusion, but at least I learned something... Clair
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Re: mag 5.9 sensor questions and what is this?
[Re: HotRodDave]
#89414
07/18/08 12:04 PM
07/18/08 12:04 PM
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Joined: Feb 2003
Posts: 8,670
Andrewh
OP
master
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OP
master
Joined: Feb 2003
Posts: 8,670
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It isn't a gm computer. They are using gm style sensors. They gave me a set for water temp and air temp. They put on a knock sensor and that is it.
You could put the air temp sensor where the original one is, but he asked for it to be put in the air intake flow, so I am putting it in the air cleaner.
When they test fired the engine, they ran the cts in the stand pipe and looped it back to the inlet of the wp.
When I put the engine in my car, I realized that would not work since I don't turn on my heat. So now he has asked me to drill and tap the intake to put the temp sensor in.
It is painless's computer, and they are reprogramming it so you can just hook it up to the injectors, coil, and distributer. Add a bracket for something near the coil, put something in the distributer, and add the 3 sensors and you can fire it up.
I would not call it painful, just a little more than I expected. But way better than any of the diy and cheaper than any of the other store bought efi systems.
after all I am dropping it into a 65 coronet. I get the efi and serpentine belt setup to boot.
Not defending per se, just saying I don't think it is that bad. I would rather not have to drill and tap the intake, but it looks like I was going to have to anyway so my stock gauge would work anyway. So not as big a deal as I thought.
I also would like them to use the stock sensors, but they don't seem interested in that at this time.
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Re: mag 5.9 sensor questions and what is this?
[Re: Andrewh]
#89415
07/18/08 12:37 PM
07/18/08 12:37 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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I was under the impression they were makeing a harness to hook a factory style computer so any one could hook up EFI, I guess that is sort of what they are doing but useing there own computer adding to the $$$ per sale and subtracting from there # of sales. Is there any harness available to take a JY engine and JY computer and hook it easily and directly into an older car? Shouldn't be that hard for one of the wiring gu-roos to whip up and sell a ton of On another subject why is a dead head EFI a bad thing? Why should we all run return lines?
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: mag 5.9 sensor questions and what is this?
[Re: Andrewh]
#89417
07/18/08 03:37 PM
07/18/08 03:37 PM
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Joined: Jul 2004
Posts: 1,868 Cali S.B
Sub95
super gas
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super gas
Joined: Jul 2004
Posts: 1,868
Cali S.B
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Quote:
well with the drilling for a new port, I can get rid of the stand pipe.
I guess the location of that sensor changes year to year. In a different post, someone posted a pic of it to the right of the thermostat housing. Mine is to the left of the stand pipe where the heater hose comes in to the manifold. on the right of the thermostat housing is a raised flat place I plan on putting the new sensor.
On my 95 i have 2 sensors one on the left and right side of the thermostat, one is for temp gauge and one is for the computer on the pic i posted that is off a 99 ram that i got on a engine and you can see where they put the single sensor at.
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Re: mag 5.9 sensor questions and what is this?
[Re: HotRodDave]
#89418
07/18/08 04:06 PM
07/18/08 04:06 PM
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Joined: Oct 2004
Posts: 482 Dirty South, MS
mopowered
mopar
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mopar
Joined: Oct 2004
Posts: 482
Dirty South, MS
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Quote:
Is there any harness available to take a JY engine and JY computer and hook it easily and directly into an older car? Shouldn't be that hard for one of the wiring gu-roos to whip up and sell a ton of
Yes actually there is - Autonomics sells one for the MegaSquirt Computer. Any Sensors/Injectors/FuelSystem -> Generic Computer -> Any engine. Or you can just scrap up some 10, 14 and 18-22ga wire and build one yourself. Just be sure to grab the sensor/injector connectors when you pick out those components to attach to your wiring harness.
Quote:
On another subject why is a dead head EFI a bad thing? Why should we all run return lines?
I'd like to hear more on this also. I personally prefer return systems for all the reasons mentioned but most of the OEM's have all switched to the dead-head style...
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