2.7 ecu running a 3.2 or 3.5ho - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 11 (permalink) Old 08-05-2005, 10:55 PM Thread Starter
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2.7 ecu running a 3.2 or 3.5ho

I recently swapped our 2nd 3.5ho into a 1998 intrepid that had a 2.7-- there have been many questions on the operation of the 3.2 or 3.5ho when running with a 2.7 ecu-- here are the results from it-- 2.7, 87,000 mi, to 3.5ho out of 1999 300m, 44,000 mi
bhp test -- 248hp at 5400rpm
manifold tuning valve-- operated under load 1800rpm on according to scanner-- had to run a new wire from the tuning valve pin on ecm to get it to work to the engine harness plugs-- 2.7 didnt have it-ecu had operational pin for it when properly powered and grounded to 5v common--
fuel -- injector pulse widths monitored were very similar to a 2000 300m that we borrowed from the used car lot next door to us--

2000 Intrepid, swapped a 3.2 into it-- came back 2mos later with driveability problems, turned out to be ecu failure-- had ecu direct program new ecu for 3.2, tested vehicle before returning to customer, small differences noted between 2.7 and 3.2 operation--
dyno test-- 224hp at 5400 r's
manifold tuning valve-- again operational under load + secondary throttle plates which are vacuum solenoid operated changing the air path in the plenum-- (this 2.7 had a tuning valve)
emissions-- both vehicles passed under 50 state emissions parameters--

2.7 injector pulse widths were the only small differences seen in these tests--
I am still trying to find out what, if any, these differences make performance wise, when i get my intrepid done Ill do some more work on it and see if there are any major issues as far as hp, fuel economy, etc, (check my site to see progress on my car intrepidconversions.com) and I will let you guys know. However, in all the swaps we have done, w/out changing ecus, no complaints, warranty claims, etc, have happened as of yet.

I know alot of people doing the swap have spent 3-400$ on ecus, and so far from my experience it seems a waste of money when you can run the 2.7 ecu and achieve the same performance as with an originally equipped 3.2 or 3.5--

Ill post more information about this when I have it-

If anyone needs any help or tech questions when swapping, or any questions at all about these cars, feel free to pm me or email--
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post #2 of 11 (permalink) Old 08-08-2005, 04:11 PM
 
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Being low budget, I kept the 2.7 ECU for a 3.2 upgrade.
Still ticking! Hauls A**!
Thanks for giving good data from experience!
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post #3 of 11 (permalink) Old 04-06-2008, 01:14 PM
 
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Hi guys, Wouldn't it be better to swap the wiring harness and ECU from the donor vehicle and the exhaust mainfolds also with no problems in the future? This was advised by an auto salvage yard! Any feedback would be appreciated! Kirk
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post #4 of 11 (permalink) Old 04-06-2008, 02:09 PM
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Quote:
Originally Posted by 32Intrepid View Post
I recently swapped our 2nd 3.5ho into a 1998 intrepid that had a 2.7-- there have been many questions on the operation of the 3.2 or 3.5ho when running with a 2.7 ecu-- here are the results from it-- 2.7, 87,000 mi, to 3.5ho out of 1999 300m, 44,000 mi
bhp test -- 248hp at 5400rpm
manifold tuning valve-- operated under load 1800rpm on according to scanner-- had to run a new wire from the tuning valve pin on ecm to get it to work to the engine harness plugs-- 2.7 didnt have it-ecu had operational pin for it when properly powered and grounded to 5v common--
fuel -- injector pulse widths monitored were very similar to a 2000 300m that we borrowed from the used car lot next door to us--

2000 Intrepid, swapped a 3.2 into it-- came back 2mos later with driveability problems, turned out to be ecu failure-- had ecu direct program new ecu for 3.2, tested vehicle before returning to customer, small differences noted between 2.7 and 3.2 operation--
dyno test-- 224hp at 5400 r's
manifold tuning valve-- again operational under load + secondary throttle plates which are vacuum solenoid operated changing the air path in the plenum-- (this 2.7 had a tuning valve)
emissions-- both vehicles passed under 50 state emissions parameters--

2.7 injector pulse widths were the only small differences seen in these tests--
I am still trying to find out what, if any, these differences make performance wise, when i get my intrepid done Ill do some more work on it and see if there are any major issues as far as hp, fuel economy, etc, (check my site to see progress on my car intrepidconversions.com) and I will let you guys know. However, in all the swaps we have done, w/out changing ecus, no complaints, warranty claims, etc, have happened as of yet.

I know alot of people doing the swap have spent 3-400$ on ecus, and so far from my experience it seems a waste of money when you can run the 2.7 ecu and achieve the same performance as with an originally equipped 3.2 or 3.5--

Ill post more information about this when I have it-

If anyone needs any help or tech questions when swapping, or any questions at all about these cars, feel free to pm me or email--

While this info is informative, and not to contradict at all what you have found, the bottom line is that if there were no differences, Chrysler would not have made two different units, nor would there be completely separate sections in the DRBIII for diagnostic proceedures.

Unless the ECMs are "learning" the parameters of the larger engines needs, there has to be some compromises.

That said, since you are the only other guy here that is experienced with this stuff, I'll keep an open mind to see what info you come up with
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post #5 of 11 (permalink) Old 04-06-2008, 06:27 PM
 
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Quote:
Originally Posted by apollosungod View Post
Hi guys, Wouldn't it be better to swap the wiring harness and ECU from the donor vehicle and the exhaust mainfolds also with no problems in the future? This was advised by an auto salvage yard! Any feedback would be appreciated! Kirk
There are some advantages to keeping the original PCM:

No need to reprogram the vin
Stored mileage is actual to the vehicle
Any SKIM issues are sidestepped

That's off the top of my head.

I think the PCM will set a MIL or airbag light also is the vehicle configuration is not in accordance to the programmed vin number.

Ross's comments are quite logical. If an OEM could get away with one or two PCM's and programming, they would.........................

Cheap so-and-so's that they are. ;)

I'm not saying that the 2.7 PCM won't work, as it obviously does. BUt there may be some minor issues that don't effect daily operation in a noticeable way.

Just sayin"...................
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post #6 of 11 (permalink) Old 04-06-2008, 08:56 PM
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Quote:
Originally Posted by Great White View Post
There are some advantages to keeping the original PCM:

No need to reprogram the vin
Stored mileage is actual to the vehicle
Any SKIM issues are sidestepped

That's off the top of my head.
TRUE - you'd need to reprogram the VIN with a DRB III and the pin code from YOUR car, not the pin code for the PCM
FALSE - Mileage is not affected by swapping in a new PCM
FALSE - SKIM will work without issue once your car's VIN # is programmed into the new PCM

I have a lot of experience with this PCM swapping stuff



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post #7 of 11 (permalink) Old 04-06-2008, 09:18 PM
 
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Originally Posted by Avenger View Post
FALSE - Mileage is not affected by swapping in a new PCM
FALSE - SKIM will work without issue once your car's VIN # is programmed into the new PCM

I have a lot of experience with this PCM swapping stuff
False number one:
If you're refereing to the mileage stored in the BCM, you're correct. PCM swap doesn't affect the mileage displayed in the odometer. But the pcm also stores vehicle mileage. The BCM and PCM would have different mileage indications. Does this matter to the normal JOE? Nope, the Odometer will display the BCM mileage.
Ross can correct me if I'm wrong, he's got a bit more experience digging around in the programming "guts" of the PCM than anyone I know..............

False number two:
we're talking about using the car's original 2.7 PCM, not a swapped in one. If the car was skim equipped, using the original 2.7 PCM would allow you to circumvent the need to reprogram the vina s it would already be correct.

No worries bro, just a little miscommunication I think...............

Cheers

Last edited by Great White; 04-06-2008 at 09:20 PM.
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post #8 of 11 (permalink) Old 04-06-2008, 10:24 PM
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#1...TRUE........the PCM mileage would NOT match the cluster mileage (easily programmed via DRB III)



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post #9 of 11 (permalink) Old 04-07-2008, 10:42 AM
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If you swapped the current VIN into the donor PCM, you can also reset the BCM mileage into the PCM, just a case of finding the proper place with the DRBIII and entering it.
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post #10 of 11 (permalink) Old 04-09-2008, 03:19 AM
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how much is a DRBIII and where can i purchase one
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post #11 of 11 (permalink) Old 04-09-2008, 09:36 AM
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how much is a DRBIII and where can i purchase one
6000$ + used on Ebay, can't get it anywhere else., ---maybe Miller tools for about 12,000 new, but I think they will only sell to a Chrysler dealer.
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