Quick question bout 3.5 HO - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 23 (permalink) Old 09-09-2012, 12:13 PM Thread Starter
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Quick question bout 3.5 HO

Hey guys I've read alot about 3.5 HO... how can you tell the difference between High output and low? I know it has something to do with the plenum is there any pics of the two.

Second looking for a back seat with the split & cup holder for the back seats (kids need to put there coffee somewhere also lol) what would be the best donor car for this?

Also just wondering what else I can do to give my car a little more pep. Also read some posts about swapping PCM from either an R/T or a 300m. Can someone enlighten me as to what bennifit this would be besides speed capping at 240kpm/150mph?

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300m 200kpm/120mph cluster
Autostick
K&N Filter (stock box with 3" custom piping -eliminating resonator)
Flowmaster 80 Muffler duel out 2.5" (from first muffler behind spare tire well)

Last edited by Intrepticon; 09-09-2012 at 12:36 PM.
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post #2 of 23 (permalink) Old 09-09-2012, 12:25 PM
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There's a more technical way to check (which I'll leave to the others), but the badge on the engine will tell you - there's a 3.5L badge and a 3.5L HO badge.

Any non-SE (there were probably SEs that had them, though) Intrepids - ES, SXT, and R/T should all be (or have a very high likelihood) of having the folding down seats - and I'm sure if you're lucky you'll find a pair that matches your current set.

Otherwise the 300M if you wanted to replace all the seats will work.
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post #3 of 23 (permalink) Old 09-09-2012, 12:38 PM
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Doesn't HO = MTV (Manifold Tuning Valve) and SRV (Short Runner Valve)? (BTW - not just 3.5 - 3.2's are HO)
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post #4 of 23 (permalink) Old 09-09-2012, 04:33 PM
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Determining if it's high output or not is pretty easy. The badge is the easiest way. But as Peva said, 3.2's (all of them from I seen) have the high output MTV/SRV equipped.

I attached a picture of what a High Output 3.X Intake has for illustrative purposes. If you compare it to yours (which I assume is not High Output) you'll see the difference.

As far as seats go, just go to the yard and yank a set, bring a set of sockets, 10,12,13,14,15,16,18 MM. Pop off the lower half by yanking up and then remove the bolts for the seat buckles and any others you see there, then pull the bottom out and lift up. It will be a work out muscling it out, and it may just pop out easy. Their all different.

As far as PCM's go. You want a 300M SPECIAL PCM. Need to match it to your year. 98-01 to 02-04. Has to be within the year bracket as your car, since in 02-04 the ECU and TCM were married to be the "PCM". Aim for a 2002 model year I guess, seems everyone says it's the cats ass... =/
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post #5 of 23 (permalink) Old 09-09-2012, 05:02 PM
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Missed the last part of the OP.

Getting the 3.5HO (if you have the regular), exhaust, and K&N are most common. Since I'm gathering you did the transplant, you'll already have the 2.7 gears.

I have been saying the same thing for the last few months about the 2002 Special PCM: I have yet to see any concrete evidence that indicates there is any bit of a performance gain by installing it. The HP ratings in the Specials remain constant from 02-04, despite the different PCM in 02-04.

If you want firmer shifts, however, the 2002 Special PCM is by far the most aggressive of the LHs.
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post #6 of 23 (permalink) Old 09-09-2012, 06:54 PM Thread Starter
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cool cool thanks for the info guys... No I haven't done the transplant yet wife want's me to wait until the engine dies 280 000 + KM on there now and still running like a dream. If I were to switch out the pcm 8is there anything I have to watch for? Read something about the sentury key. (Mine has it).

Also just a couple more questions.. for the seats if I grab the ones with the memory/heat i know I need the harnesses is there anything else I need to grab?

Trans temp gauge ---> instead of moding the Trans plate could I just tap into the trans line going into the rad? And could someone tell me what the two capped off lines coming off the transmission on the passenger side are? (Image below)

And lastly my rad has the hookups for an oil cooler... is it worth it and where could I get one?

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post #7 of 23 (permalink) Old 09-09-2012, 08:06 PM
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Quote:
Originally Posted by wishihadacharger View Post
...And could someone tell me what the two capped off lines coming off the transmission on the passenger side are? (Image below)
Those are vents to allow air in and out with temperature changes to equalize pressure.

Quote:
And lastly my rad has the hookups for an oil cooler...
I think what you mean is that the radiator has the cooler built into it, but the connections to the engine are not there.

Quote:
is it worth it and where could I get one?...
Jury's still out on that. Many people whose cars came with the oil cooler radiator disconnected it without problems (I'm one). However there are some who believe that what appear to be lower end bearing failures in later year LH cars may be due to lack of the oil cooling.

Pretty sure they weren't hooking up the oil cooler in '04. So either they were using the radiators with the cooler tank but not hooking them up, or a previous owner had the radiator replaced and put in one with it - which is pretty common as most of the aftermarket radiators out there for our cars have the oil cooler tank since it can be used in cars with or without the hookups.


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post #8 of 23 (permalink) Old 09-09-2012, 08:11 PM
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Quote:
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I have been saying the same thing for the last few months about the 2002 Special PCM: I have yet to see any concrete evidence that indicates there is any bit of a performance gain by installing it. The HP ratings in the Specials remain constant from 02-04, despite the different PCM in 02-04.

If you want firmer shifts, however, the 2002 Special PCM is by far the most aggressive of the LHs.
Much like the Prowler which has the same powertrain as any 3.5L LH model, the major differences between a regular LH and the 300M Special and a Prowler was PCM parameters...

The Special was definitely a more aggressively "tuned" PCM, undeniably; hence why the Specials were required to use Supreme gas. Firmer shifts and a higher or lack of a speed gov is other additions.

In short, you're not going to gain 30+HP swapping the PCM, but you'll gain much broader A/F bands and efficiency. It's just marginally more capable is what I'm saying. People have said that High Output is a 5HP gain, max.
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post #9 of 23 (permalink) Old 09-09-2012, 08:18 PM
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Quote:
Originally Posted by TrepLovin View Post
Determining if it's high output or not is pretty easy. The badge is the easiest way. But as Peva said, 3.2's (all of them from I seen) have the high output MTV/SRV equipped.

I attached a picture of what a High Output 3.X Intake has for illustrative purposes. If you compare it to yours (which I assume is not High Output) you'll see the difference.

As far as seats go, just go to the yard and yank a set, bring a set of sockets, 10,12,13,14,15,16,18 MM. Pop off the lower half by yanking up and then remove the bolts for the seat buckles and any others you see there, then pull the bottom out and lift up. It will be a work out muscling it out, and it may just pop out easy. Their all different.

As far as PCM's go. You want a 300M SPECIAL PCM. Need to match it to your year. 98-01 to 02-04. Has to be within the year bracket as your car, since in 02-04 the ECU and TCM were married to be the "PCM". Aim for a 2002 model year I guess, seems everyone says it's the cats ass... =/
Special PCM was 02-04 only. It would take ALOT of work to get it to work in a 98-01 car. Alot. If its an earlier car, then he wants a PHP PCM from a 2000 300m. Its supposedly almost as good as a Special PCM.
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post #10 of 23 (permalink) Old 09-09-2012, 08:31 PM
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Cheers, I forgot the Special was an 02-04 deal. A 2000 RT or PHP ECU would be the very very few decent things to try for on earlier models (98-01).
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post #11 of 23 (permalink) Old 09-09-2012, 08:54 PM Thread Starter
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Mines an 04 so I'm good there. As for the memory/heated seat is it plug and play (connections and wireing of course) or do I need a bcm or PCM? Also when I swap engines would I need to grab a PCM?
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post #12 of 23 (permalink) Old 09-09-2012, 08:54 PM
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Cheers, I forgot the Special was an 02-04 deal. A 2000 RT or PHP ECU would be the very very few decent things to try for on earlier models (98-01).
Pretty much. If he's looking for as much horsepower as he can get, The M is going to be the better choice. But the R/T one may be more common. Ms had 253 vs 242 for the R/T
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post #13 of 23 (permalink) Old 09-09-2012, 11:36 PM
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Originally Posted by TrepLovin View Post
Much like the Prowler which has the same powertrain as any 3.5L LH model, the major differences between a regular LH and the 300M Special and a Prowler was PCM parameters...

The Special was definitely a more aggressively "tuned" PCM, undeniably; hence why the Specials were required to use Supreme gas. Firmer shifts and a higher or lack of a speed gov is other additions.

In short, you're not going to gain 30+HP swapping the PCM, but you'll gain much broader A/F bands and efficiency. It's just marginally more capable is what I'm saying. People have said that High Output is a 5HP gain, max.
I was specifically talking about the 2002 Special PCM, which had the firmest shifts of the Specials.

People have been saying the 2002 PCM in particular gives a HP/performance gain - especially compared to the 03/04 Special PCMs which were tuned for smoother shifts.

Last edited by Vilgent; 09-09-2012 at 11:38 PM.
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post #14 of 23 (permalink) Old 09-09-2012, 11:44 PM
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Originally Posted by wishihadacharger View Post
Mines an 04 so I'm good there. As for the memory/heated seat is it plug and play (connections and wireing of course) or do I need a bcm or PCM? Also when I swap engines would I need to grab a PCM?
You would need to either get creative with wiring to make the seats work 100%, or the easier route would be to snag the complete body harness from a car with heated/memory seats. Your BCM will run it fine. The memory function is actually in the seat. As for the PCM, you can run a 3.5 with a 2.7 PCM. You'll lose 2 functions (Short Runner Valve and Manifold Tuning Valve) but it will run. However it wont run at its optimal performance. A year and a half ago at a meet I along with somebody else decided to do Special PCM swaps in our cars. I was able to do mine successfully but he accidentally locked his out, along with his old one. So I gave him my old 2.7 PCM to run his normal output 3.5 to get him home. He said it took a few hundred miles for the PCM to learn the motor, then it was okay


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Last edited by Squilliam; 09-09-2012 at 11:48 PM.
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post #15 of 23 (permalink) Old 09-10-2012, 10:11 AM
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Memory Seats is something that requires a lot of wiring effort so it seems, according to everyone who has done it.

I'm still rolling with my 2.7 PCM, since I have yet to find a 3.5L 02-04 PCM. Holding out for the Special. :P
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